Ckp sensor ISUZU TROOPER 1998 Service Repair Manual

6E±2
ENGINE DRIVEABILITY AND EMISSIONS
Primary System-Based Diagnostic 6E±50. . . . . . . . .
Primary System-Based Diagnostic 6E±50. . . . . . .
Fuel Control Heated Oxygen Sensor 6E±50. . . . .
HO2S Heater 6E±50. . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Trim System Monitor Diagnostic
Operation 6E±50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Trim System Monitor Diagnostic
Operation 6E±50. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Trim Cell Diagnostic Weights 6E±50. . . . . . .
On-Board Diagnostic (OBD) System Check 6E±51.
A/C Clutch Control Circuit Diagnosis 6E±54. . . . . . .
Electronic Ignition System Diagnosis 6E±60. . . . . . .
Fuel Metering System Check 6E±60. . . . . . . . . . . . .
Idle Air Control (IAC) Valve 6E±60. . . . . . . . . . . . . . .
Fuel System Pressure Test 6E±60. . . . . . . . . . . . . . .
Fuel Injector Coil Test Procedure and Fuel
Injector Balance Test Procedure 6E±60. . . . . . . . . .
Knock Sensor Diagnosis 6E±65. . . . . . . . . . . . . . . . .
Powertrain Control Module (PCM) Diagnosis 6E±65
Multiple PCM Information Sensor DTCS Set 6E±65
Exhaust Gas Recirculation (EGR) Diagnosis
(For except EXPORT and
SOUTH AFRICA) 6E±68. . . . . . . . . . . . . . . . . . . . . . .
Engine Tech 2 Data Definitions and Ranges 6E±68
Typical Scan Data Values 6E±70. . . . . . . . . . . . . . . .
No Malfunction Indicator Lamp (MIL) 6E±74. . . . . . .
Malfunction Indicator Lamp (MIL) ªONº
Steady 6E±77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Cranks But Will Not Run 6E±79. . . . . . . . . . .
Fuel System Electrical Test 6E±85. . . . . . . . . . . . . . .
Fuel System Diagnosis 6E±88. . . . . . . . . . . . . . . . . . .
Idle Air Control (IAC) System Check 6E±93. . . . . . .
Knock Sensor (KS) System Check
(Engine Knock, Poor Performance, or Poor
Economy) 6E±95. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Gas Recirculation (EGR) System
Check 6E±97. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manifold Absolute Pressure (MAP) Output
Check 6E±99. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCM Diagnostic Trouble Codes 6E±101. . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0101
MAF System Performance 6E±104. . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0102
MAF Sensor Circuit Low Frequency 6E±107. . . . . .
Diagnostic Trouble Code (DTC) P0103
MAF Sensor Circuit High Frequency 6E±110. . . . . .
Diagnostic Trouble Code (DTC) P0107
MAP Sensor Circuit Low Voltage 6E±112. . . . . . . . . .
Diagnostic Trouble Code (DTC) P0108
MAP Sensor Circuit High Voltage 6E±115. . . . . . . . .
Diagnostic Trouble Code (DTC) P0112
IAT Sensor Circuit Low Voltage 6E±118. . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0113
IAT Sensor Circuit High Voltage 6E±121. . . . . . . . . . Diagnostic Trouble Code (DTC) P0117
ECT Sensor Circuit Low Voltage 6E±124. . . . . . . . . .
Diagnostic Trouble Code (DTC) P0118
ECT Sensor Circuit High Voltage 6E±127. . . . . . . . .
Diagnostic Trouble Code (DTC) P0121
TP System Performance 6E±130. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0122
TP Sensor Circuit Low Voltage 6E±133. . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0123
TP Sensor Circuit High Voltage 6E±136. . . . . . . . . .
Diagnostic Trouble Code (DTC) P0131
HO2S Circuit Low Voltage Bank 1
Sensor 1 6E±139. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0132
HO2S Circuit High Voltage Bank 1
Sensor 1 6E±142. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0134
HO2S Circuit Insufficient Activity Bank 1
Sensor 1 6E±145. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0151
HO2S Circuit Low Voltage Bank 2
Sensor 1 6E±148. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0152
HO2S Circuit HIGH Voltage Bank 2
Sensor 1 6E±151. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0171
Fuel Trim System Lean Bank 1 6E±154. . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0172
Fuel Trim System Rich Bank 1 6E±158. . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0174
Fuel Trim System Lean Bank 2 6E±162. . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0175
Fuel Trim System Rich Bank 2 6E±166. . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0201
Injector 1 Control Circuit 6E±170. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0202
Injector 2 Control Circuit 6E±173. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0203
Injector 3 Control Circuit 6E±176. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0204
Injector 4 Control Circuit 6E±179. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0205
Injector 5 Control Circuit 6E±182. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0206
Injector 6 Control Circuit 6E±185. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0325
KS Module Circuit 6E±188. . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0327
KS Sensor Circuit 6E±190. . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0336
58X Reference Signal Circuit 6E±193. . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0337
CKP Sensor Circuit Low Frequency 6E±195. . . . . . .
Diagnostic Trouble Code (DTC) P0341
CMP Sensor Circuit Performance 6E±198. . . . . . . . .
Diagnostic Trouble Code (DTC) P0342
CMP Sensor Circuit Low 6E±202. . . . . . . . . . . . . . . . .

6E±3 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0351
Ignition 1 Control Circuit 6E±206. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0352
Ignition 2 Control Circuit 6E±209. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0353
Ignition 3 Control Circuit 6E±212. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0354
Ignition 4 Control Circuit 6E±215. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0355
Ignition 5 Control Circuit 6E±218. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0356
Ignition 6 Control Circuit 6E±221. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0402
EGR Pintle Crank Error 6E±224. . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0404
EGR Open Stuck 6E±226. . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0405
EGR Low Voltage 6E±228. . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0406
EGR High Voltage 6E±231. . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0502
VSS Circuit Low Input 6E±234. . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0562
System Voltage Low 6E±237. . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0563
System Voltage High 6E±239. . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0601
PCM Memory 6E±240. . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1154
HO2S Circuit Transition Time Ratio Bank 2
Sensor 1 6E±241. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1171
Fuel System Lean During Acceleration 6E±245. . . .
Diagnostic Trouble Code (DTC) P1380
ABS Rough Road ABS System Fault 6E±248. . . . . .
Diagnostic Trouble Code (DTC) P1404
EGR Closed Stuck 6E±249. . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1508
IAC System Low RPM 6E±251. . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1509
IAC System High RPM 6E±254. . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1618
Serial Peripheral Interface (SPI) PCM
Interprocessor Communication Error 6E±257. . . . . .
Diagnostic Trouble Code (DTC) P1625
PCM Unexpected Reset 6E±258. . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1640
Driver-1-Input High Voltage 6E±259. . . . . . . . . . . . . .
Symptom Diagnosis 6E±262. . . . . . . . . . . . . . . . . . . . .
Default Matrix Table 6E±288. . . . . . . . . . . . . . . . . . . . .
Camshaft Position (CMP) Sensor 6E±291. . . . . . . . . .
Crankshaft Position (CKP) Sensor 6E±292. . . . . . . . .
Engine Coolant Temperature (ECT) Sensor 6E±292.
Heated Oxygen Sensor (HO2S) 6E±293. . . . . . . . . . .
Intake Air Temperature (IAT) Sensor 6E±295. . . . . . .
Knock Sensor (KS) 6E±296. . . . . . . . . . . . . . . . . . . . . . Mass Air Flow (MAF) Sensor 6E±297. . . . . . . . . . . . .
Manifold Absolute Pressure (MAP) Sensor 6E±297.
Malfunction Indicator Lamp (MIL) 6E±298. . . . . . . . . .
Powertrain Control Module (PCM) 6E±298. . . . . . . . .
EEPROM 6E±300. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Steering Pressure (PSP) Switch 6E±300. . . .
Throttle Position (TP) Sensor 6E±301. . . . . . . . . . . . .
Vehicle Speed Sensor (VSS) 6E±302. . . . . . . . . . . . .
Air Cleaner/Air Filter 6E±303. . . . . . . . . . . . . . . . . . . . .
Idle Air Control (IAC) Valve 6E±304. . . . . . . . . . . . . . .
Common Chamber 6E±305. . . . . . . . . . . . . . . . . . . . . .
Accelerator Cable Assembly 6E±305. . . . . . . . . . . . . .
Accelerator Pedal Replacement 6E±308. . . . . . . . . . .
Fuel Filter Cap 6E±310. . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Filter 6E±310. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Gauge Unit 6E±313. . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injectors 6E±314. . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pressure Regulator 6E±315. . . . . . . . . . . . . . . . .
Fuel Metering System 6E±317. . . . . . . . . . . . . . . . . . . .
Fuel Pump Assembly 6E±318. . . . . . . . . . . . . . . . . . . .
Fuel Pump Relay 6E±319. . . . . . . . . . . . . . . . . . . . . . . .
Fuel Rail Assembly 6E±319. . . . . . . . . . . . . . . . . . . . . .
Fuel Tank 6E±321. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Body (TB) 6E±323. . . . . . . . . . . . . . . . . . . . . . .
Electronic Ignition System 6E±324. . . . . . . . . . . . . . . .
Catalytic Converter 6E±325. . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Relay 6E±325. . . . . . . . . . . . . . . . . . .
EVAP Canister Hoses 6E±326. . . . . . . . . . . . . . . . . . . .
EVAP Canister 6E±326. . . . . . . . . . . . . . . . . . . . . . . . . .
EVAP Canister Purge Solenoid 6E±327. . . . . . . . . . . .
Fuel Tank Vent Valve 6E±328. . . . . . . . . . . . . . . . . . . .
Linear Exhaust Gas Recirculation
(EGR) Valve 6E±328. . . . . . . . . . . . . . . . . . . . . . . . . . .
Positive Crankcase Ventilation (PCV) Valve 6E±329.
Wiring and Connectors 6E±330. . . . . . . . . . . . . . . . . . .
PCM Connectors and Terminals 6E±330. . . . . . . . . . .
Wire Harness Repair: Twisted Shielded
Cable 6E±330. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Twisted Leads 6E±331. . . . . . . . . . . . . . . . . . . . . . . . . .
Weather-Pack Connector 6E±332. . . . . . . . . . . . . . . . .
Com-Pack III 6E±333. . . . . . . . . . . . . . . . . . . . . . . . . . .
Metri-Pack 6E±333. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Description 6E±335. . . . . . . . . . . . . . . . . . . . .
General Description (PCM and Sensors) 6E±335. . .
58X Reference PCM Input 6E±335. . . . . . . . . . . . . .
A/C Request Signal 6E±335. . . . . . . . . . . . . . . . . . . .
Crankshaft Position (CKP) Sensor 6E±335. . . . . . .
Camshaft Position (CMP) Sensor and
Signal 6E±335. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Coolant Temperature (ECT) Sensor 6E±335
Electrically Erasable Programmable Read
Only Memory (EEPROM) 6E±336. . . . . . . . . . . . . .
Fuel Control Heated Oxygen Sensors 6E±336. . . .
Intake Air Temperature (IAT) Sensor 6E±336. . . . .

6E±4
ENGINE DRIVEABILITY AND EMISSIONS
Knock Sensor 6E±337. . . . . . . . . . . . . . . . . . . . . . . . .
Linear Exhaust Gas Recirculation (EGR)
Control 6E±337. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mass Air Flow (MAF) Sensor 6E±337. . . . . . . . . . . .
Manifold Absolute Pressure (MAP) Sensor 6E±338
Powertrain Control Module (PCM) 6E±338. . . . . . .
PCM Function 6E±338. . . . . . . . . . . . . . . . . . . . . . . . .
PCM Components 6E±339. . . . . . . . . . . . . . . . . . . . .
PCM Voltage Description 6E±339. . . . . . . . . . . . . . .
PCM Input/Outputs 6E±339. . . . . . . . . . . . . . . . . . . .
PCM Service Precautions 6E±339. . . . . . . . . . . . . .
Reprogramming The PCM 6E±339. . . . . . . . . . . . . .
Throttle Position (TP) Sensor 6E±339. . . . . . . . . . .
Transmission Fluid Temperature (TFT)
Sensor 6E±340. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Range Switch 6E±340. . . . . . . . . . . . .
Vehicle Speed Sensor (VSS) 6E±340. . . . . . . . . . . .
Use of Circuit Testing Tools 6E±340. . . . . . . . . . . . .
Aftermarket Electrical and Vacuum
Equipment 6E±340. . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic Discharge Damage 6E±341. . . . . . . . .
Upshift Lamp 6E±341. . . . . . . . . . . . . . . . . . . . . . . . .
General Description (Air Induction) 6E±341. . . . . . . .
Air Induction System 6E±341. . . . . . . . . . . . . . . . . . .
General Description (Fuel Metering) 6E±341. . . . . . .
Acceleration Mode 6E±341. . . . . . . . . . . . . . . . . . . . .
Accelerator Controls 6E±341. . . . . . . . . . . . . . . . . . .
Battery Voltage Correction Mode 6E±341. . . . . . . .
CMP Signal 6E±341. . . . . . . . . . . . . . . . . . . . . . . . . . .
Clear Flood Mode 6E±342. . . . . . . . . . . . . . . . . . . . .
Deceleration Mode 6E±342. . . . . . . . . . . . . . . . . . . .
Engine Speed/Vehicle Speed/Fuel
Disable Mode 6E±342. . . . . . . . . . . . . . . . . . . . . . . .
Fuel Cutoff Mode 6E±342. . . . . . . . . . . . . . . . . . . . . .
Fuel Injector 6E±342. . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Metering System Components 6E±342. . . . . . Fuel Metering System Purpose 6E±342. . . . . . . . . .
Fuel Pressure Regulator 6E±343. . . . . . . . . . . . . . . .
Fuel Pump Electrical Circuit 6E±343. . . . . . . . . . . . .
Fuel Rail 6E±343. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idle Air Control (IAC) Valve 6E±343. . . . . . . . . . . . .
Run Mode 6E±344. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Mode 6E±344. . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Body Unit 6E±344. . . . . . . . . . . . . . . . . . . . .
General Description (Electronic Ignition
System) 6E±344. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camshaft Position (CMP) Sensor 6E±344. . . . . . . .
Crankshaft Position (CKP) Sensor 6E±345. . . . . . .
Electronic Ignition 6E±345. . . . . . . . . . . . . . . . . . . . .
Ignition Coils 6E±345. . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Control 6E±345. . . . . . . . . . . . . . . . . . . . . . . .
Ignition Control PCM Output 6E±347. . . . . . . . . . . .
Knock Sensor (KS) PCM Input 6E±347. . . . . . . . . .
Powertrain Control Module (PCM) 6E±347. . . . . . .
Spark Plug 6E±347. . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/C Clutch Diagnosis 6E±349. . . . . . . . . . . . . . . . . . . .
A/C Clutch Circuit Operation 6E±349. . . . . . . . . . . .
A/C Clutch Circuit Purpose 6E±349. . . . . . . . . . . . .
A/C Request Signal 6E±349. . . . . . . . . . . . . . . . . . . .
General Description (Exhaust Gas
Recirculation (EGR) System) 6E±349. . . . . . . . . . . . .
EGR Purpose 6E±349. . . . . . . . . . . . . . . . . . . . . . . . .
Linear EGR Valve 6E±349. . . . . . . . . . . . . . . . . . . . .
Linear EGR Control 6E±349. . . . . . . . . . . . . . . . . . . .
Linear EGR Valve Operation and Results
of Incorrect Operation 6E±349. . . . . . . . . . . . . . . . .
EGR Pintle Position Sensor 6E±350. . . . . . . . . . . . .
General Description (Positive Crankcase
Ventilation (PCV) System) 6E±350. . . . . . . . . . . . . . .
Crankcase Ventilation System Purpose 6E±350. . .
Crankcase Ventilation System Operation 6E±350.

6E±24
ENGINE DRIVEABILITY AND EMISSIONS
PCM Pinout Table, 32-Way Blue Connector ± Row ªEº
(For except EXPORT and SOUTH AFRICA)
TS23346
PINPIN FunctionWire ColorIGN ONENG RUNRefer To
E1Transmission Output Shaft
Sensor (TOSS) HighRED0.0 V0.1 VAutomatic Transmission
(4L30E)
E2Transmission Output Shaft
Sensor (TOSS) LowWHT0.0 V0.0 VAutomatic Transmission
(4L30E)
E3Pressure Control Solenoid
LowPPL/RED0.0 V1.1 VAutomatic Transmission
(4L30E)
E4Pressure Control Solenoid
HighPPL/WHT0.0 V4.9 VAutomatic Transmission
(4L30E)
E5Exhaust Gas Recirculation
(EGR) Control HighBLK/YELB+B+General Description and
Operation, EGR Control
E6Exhaust Gas Recirculation
(EGR) Control LowYELB+B+General Description and
Operation, EGR Control
E7Transmission Range
Signal ªBºBLU/YEL0.0 V0.0 VAutomatic Transmission
(4L30E)
E8Throttle Position (TP)
SensorBLU0.5-0.8 V0.5-0.8 V
(at idle)General Description and
Operation, Throttle Position
Sensor
E9Engine Coolant
Temperature (ECT)
SensorBLU/RED0.5-4.9 V
(depends on
temperature)0.5-4.9 V
(depends on
temperature)General Description and
Operation, Engine Coolant
Temperature (ECT) Sensor
E10Not UsedÐÐÐÐ
E11Crankshaft Position (CKP)
Sensor +5 Volt ReferenceYEL/RED5.0 V or less
than 1.0 V5.0 VGeneral Description and
Operation, Crankshaft
Position Sensor
E12Transmission Range
Signal ªAºBLU/WHTB+B+Automatic Transmission
(4L30E)
E13Fuel Pump (FP) RelayRED/WHT0.0 VB+On-Vehicle Service, Fuel
Pump Relay
E14Shift High (BAND APPLY)BRN/WHTB+B+Automatic Transmission
(4L30E)

6E±26
ENGINE DRIVEABILITY AND EMISSIONS
PCM Pinout Table, 32-Way Blue Connector ± Row ªEº
(For EXPORT and SOUTH AFRICA)
TS23346
PINPIN FunctionWire ColorIGN ONENG RUNRefer To
E1Transmission Output Shaft
Sensor (TOSS) HighRED0.0 V0.1 VAutomatic Transmission
(4L30E)
E2Transmission Output Shaft
Sensor (TOSS) LowWHT0.0 V0.0 VAutomatic Transmission
(4L30E)
E3Pressure Control Solenoid
LowPPL/RED0.0 V1.1 VAutomatic Transmission
(4L30E)
E4Pressure Control Solenoid
HighPPL/WHT0.0 V4.9 VAutomatic Transmission
(4L30E)
E5Not UsedÐÐÐÐ
E6Not UsedÐÐÐÐ
E7Transmission Range
Signal ªBºBLU/YEL0.0 V0.0 VAutomatic Transmission
(4L30E)
E8Throttle Position (TP)
SensorBLU0.5-0.8 V0.5-0.8 V
(at idle)General Description and
Operation, Throttle Position
Sensor
E9Engine Coolant
Temperature (ECT)
SensorBLU/RED0.5-4.9 V
(depends on
temperature)0.5-4.9 V
(depends on
temperature)General Description and
Operation, Engine Coolant
Temperature (ECT) Sensor
E10Not UsedÐÐÐÐ
E11Crankshaft Position (CKP)
Sensor +5 Volt ReferenceYEL/RED5.0 V or less
than 1.0 V5.0 VGeneral Description and
Operation, Crankshaft
Position Sensor
E12Transmission Range
Signal ªAºBLU/WHTB+B+Automatic Transmission
(4L30E)
E13Fuel Pump (FP) RelayRED/WHT0.0 VB+On-Vehicle Service, Fuel
Pump Relay
E14Shift High (BAND APPLY)BRN/WHTB+B+Automatic Transmission
(4L30E)
E15A/C RequestGRN/ORN0.0 V0.0 VElectric Cooling Fans
E16Ignition Feed (1 of 2 F16)RED/BLUB+B+Ð

6E±39 ENGINE DRIVEABILITY AND EMISSIONS
The data displayed on the other Tech 2 will appear the
same, with some exceptions. Some Tech 2s will only be
able to display certain vehicle parameters as values that
are a coded representation of the true or actual value. For
more information on this system of coding, refer to
Decimal/Binary/Hexadecimal Conversions. On this
vehicle Tech 2 displays the actual values for vehicle
parameters. It will not be necessary to perform any
conversions from coded values to actual values.
On-Board Diagnostic (OBD)
On-Board Diagnostic Tests
A diagnostic test is a series of steps, the result of which is
a pass or fail reported to the diagnostic executive. When
a diagnostic test reports a pass result, the diagnostic
executive records the following data:

The diagnostic test has been completed since the last
ignition cycle.

The diagnostic test has passed during the current
ignition cycle.

The fault identified by the diagnostic test is not
currently active.
When a diagnostic test reports a fail result, the diagnostic
executive records the following data:

The diagnostic test has been completed since the last
ignition cycle.

The fault identified by the diagnostic test is currently
active.

The fault has been active during this ignition cycle.

The operating conditions at the time of the failure.
Remember, a fuel trim DTC may be triggered by a list of
vehicle faults. Make use of all information available (other
DTCs stored, rich or lean condition, etc.) when
diagnosing a fuel trim fault.
Comprehensive Component Monitor
Diagnostic Operation
Input Components:
Input components are monitored for circuit continuity and
out-of-range values. This includes rationality checking.
Rationality checking refers to indicating a fault when the
signal from a sensor does not seem reasonable, i.e.
Throttle Position (TP) sensor that indicates high throttle
position at low engine loads or MAP voltage. Input
components may include, but are not limited to the
following sensors:

Vehicle Speed Sensor (VSS)

Crankshaft Position (CKP) sensor

Knock Sensor (KS)

Throttle Position (TP) sensor

Engine Coolant Temperature (ECT) sensor

Camshaft Position (CMP) sensor

Manifold Absolute Pressure (MAP) sensor

Mass Air Flow (MAF) sensorIn addition to the circuit continuity and rationality check,
the ECT sensor is monitored for its ability to achieve a
steady state temperature to enable closed loop fuel
control.
Output Components:
Output components are diagnosed for proper response to
control module commands. Components where
functional monitoring is not feasible will be monitored for
circuit continuity and out-of-range values if applicable.
Output components to be monitored include, but are not
limited to, the following circuits:

Idle Air Control (IAC) Motor

Electronic Transmission controls

A/C relays

Cooling fan relay

VSS output

MIL control

Cruise control inhibit
Refer to PCM and Sensors in General Descriptions.
Passive and Active Diagnostic Tests
A passive test is a diagnostic test which simply monitors a
vehicle system or component. Conversely, an active test,
actually takes some sort of action when performing
diagnostic functions, often in response to a failed passive
test. For example, the EGR diagnostic active test will
force the EGR valve open during closed throttle decel
and/or force the EGR valve closed during a steady state.
Either action should result in a change in manifold
pressure.
Intrusive Diagnostic Tests
This is any on-board test run by the Diagnostic
Management System which may have an effect on
vehicle performance or emission levels.
Warm-Up Cycle
A warm-up cycle means that engine at temperature must
reach a minimum of 70
C (160
F) and rise at least 22
C
(40
F) over the course of a trip.
Freeze Frame
Freeze Frame is an element of the Diagnostic
Management System which stores various vehicle
information at the moment an emissions-related fault is
stored in memory and when the MIL is commanded on.
These data can help to identify the cause of a fault. Refer
to
Storing And Erasing Freeze Fame Data for more
detailed information.
Failure Records
Failure Records data is an enhancement of the OBD
Freeze Frame feature. Failure Records store the same
vehicle information as does Freeze Frame, but it will store
that information for any fault which is stored in on-board
memory, while Freeze Frame stores information only for
emission-related faults that command the MIL on.

6E±80
ENGINE DRIVEABILITY AND EMISSIONS
Circuit Description
The electronic Ignition system uses a coil-at-plug method
of spark distribution. In this type of ignition system, the
powertrain control module (PCM) triggers the correct
driver inside the ignition coil, which then triggers the
correct ignition coil based on the 58X signal received from
the crankshaft position sensor (CKP). The spark plug
connected to the coil fires when the ICM opens the ground
circuit for the coil's primary circuit.
During crank, the PCM monitors the CKP 58X signal. The
CKP signal is used to determine which cylinder will fire
first. After the CKP 58X signal has been processed by the
PCM, it will command all six injectors to allow a priming
shot of fuel for all the cylinders. After the priming, the
injectors are left ªOFFº during the next six 58X reference
pulses from the CKP. This allows each cylinder a chance
to use the fuel from the priming shot. During this waiting
period, a camshaft position (CMP) signal pulse will have
been received by the PCM. The CMP signal allows the
PCM to operate the injectors sequentially based on
camshaft position. If the camshaft position signal is not
present at start-up, the PCM will begin sequential fuel
delivery with a 1-in-6 chance that fuel delivery is correct.
The engine will run without a CMP signal, but will set a
DTC code.
Diagnostic Aids
An intermittent problem may be caused by a poor
connection, rubbed-through wire insulation or a wire
broken inside the insulation. Check for the following
items:

Poor connection or damaged harness ± Inspect the
PCM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wire connection, and
damaged harness.

Faulty engine coolant temperature sensor ± Using
Tech 2, compare engine coolant temperature with
intake air temperature on a completely cool engine.
Engine coolant temperature should be within 10
C of
intake air temperature. If not, replace the ECT sensor.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
5. An obvious cause of low fuel pressure would be an
empty fuel tank.
6. The engine will easily start and run if a few injectors
are disabled. It is not necessary to test all injectors
at this time since this step is only a test to verify that
all of the injectors have not been disabled by fuel
contamination.
7. A blinking test light verifies that the PCM is
monitoring the 58X crankshaft reference signal and
is capable of activating the injectors. If there is an
open or shorted driver circuit, DTCs 201-206 should
be set.
19.By using a spark tester, each ignition coil's ability to
produce 25,000 volts is verified.
25.If there is an open or shorted driver circuit, DTCs
201-206 should be set. All six injector driver circuits
can be checked at one time without removing the
intake manifold if a 5-8840-2636-0 test light is
available. This is the alternative procedure:

With the ignition ªOFF,º disconnect the gray
connector located at the rear of the air filter, attached
to a bracket on the purge canister.

Connect test light 5-8840-2636-0 to the connector.
Do any of the light constantly illuminate or fail to blink
when the engine is cranked? If so, repair the short or
open circuit, or replace the PCM if indicated.
This procedure only tests the driver circuit as far as the
test connection, so step 31 is added to test the circuit all
the way to the injector.

6E±83 ENGINE DRIVEABILITY AND EMISSIONS
Engine Cranks But Will Not Run

 
StepNo Ye s Value(s) Action
201. At the PCM (female) side of the connector, connect
a test light between the ignition + terminal and one
of the injector driver circuits at the same connector.
2. Ignition ªON.º
3. Observe the test light, and repeat the test for each
injector driver circuit.
Did the test light stay on when checking any of the 6
injector driver circuits?
ÐGo to Step 21Go to Step 23
211. Ignition ªOFF,º disconnect the PCM.
2. Ignition ªON,º observe the test light.
Is the test light ªON?º
ÐGo to Step 22Go to Step 27
22Locate and repair the short to ground in the injector
driver circuit.
Is the action complete?
ÐVerify repairÐ
231. Using the same test location as in step 20, connect
a test light between the ignition terminal and one of
the driver circuits.
2. Crank the engine and observe the test light.
3. Repeat for each injector driver circuit.
Did the light blink during the test for each circuit?
ÐGo to Step 25Go to Step 24
24Check for an open injector driver circuit.
Was a problem found?
ÐVerify repairGo to Step 27
251. At the injector (male) side of the gray connector,
connect an ohmmeter between the ignition pin and
one of the driver circuit pins.
2. Check for continuity in the circuit.
3. Repeat for each injector circuit. The readings
should be approximately equal to the specified
value for injector resistance.
Was a problem found?
12.5 ohmsVerify repairGo to Step 8
26Repair the ignition feed circuit.
Is the action complete?
ÐVerify repairÐ
27Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
UBS 98model year Immobilizer
Workshop Manual.
Is the action complete?ÐVerify repairÐ
281. Raise the vehicle and disconnect the CKP sensor
harness.
2. Ignition ªON.º
3. With a test light to ground, probe the harness
ignition feed terminal.
Did the light illuminate?
ÐGo to Step 30Go to Step 29
29Check the ignition feed wire between the sensor and
the PCM for a short to ground or open circuit.
Is the action complete?
ÐVerify repairÐ

6E±84
ENGINE DRIVEABILITY AND EMISSIONS
Engine Cranks But Will Not Run

 
StepNo Ye s Value(s) Action
301. Ignition ªON.º
2. At the CKP harness connector, connect a test light
between the ignition and ground terminals.
Did the light illuminate?
ÐGo to Step 32Go to Step 31
31Check the sensor ground circuit for an open or short to
voltage.
Is the action complete?
ÐVerify repairÐ
32Check the signal circuit between the sensor and the
PCM for a short to ground, short to voltage, or an open.
Was a problem found?
ÐVerify repairGo to Step 33
33Replace the CKP sensor.
Is the action complete?
ÐVerify repairGo to Step 27

6E±96
ENGINE DRIVEABILITY AND EMISSIONS
Knock Sensor (KS) System Check
(Engine Knock, Poor Performance, or Poor Economy)

StepActionValue(s)Ye sNo
1Is DTC P0325 or P0327 set?
Ð
Go to DTC
P0325 or
DTC P0327
Go to Step 2
2Run the engine at 1500 RPM.
Is there an internal engine knock?
ÐGo to Step 3Go to Step 4
3Repair the mechanical problem.
Is the action complete?
ÐVerify repairÐ
41. Install Tech 2.
2. Turn the ignition ªON.º
3. Cycle through the list until ªKnock Retardº is
displayed.
Is knock retard at the specified value?
0
Go to Step 6Go to Step 7
5Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
UBS 98model year Immobilizer
Workshop Manual.
Is the action complete?ÐVerify repairÐ
61. Start the engine.
2. Monitor the knock retard display on Tech 2 while
changing the throttle setting to place different loads
on the engine.
Is knock retard at the specified value? (Turn the ignition
ªOFF.º)
0
Go to Step 9Go to Step 7
71. At the rear of the engine, behind the rear fuel
injector on the lift side, disconnect the 2-wire knock
sensor harness connector.
2. Attach the positive lead of DVM to B+.
3. On the main harness side of the connector, use the
negative lead of the DVM to probe the connector pin
that is connected to the black wire.
Dose the DVM indicate the specified value?
(Reconnect the knock sensor harness.)
B+Go to Step 9Go to Step 8
8Repair the open black wire ground for the shield which
prevents stray electromagnetic pulses from affecting
the knock signal.
Is the action complete?
ÐVerify repairÐ
91. Reconnect the wire harness.
2. Set a DVM to AC voltage.
3. With the DVM, backprobe the PCM connector at
A2.
4. Tap the engine lift brackprobe with a socket
extension.
Did the DVM show an increase in AC voltage while
tapping on the lift bracket?
ÐSystem OKGo to Step 10
10Replace the knock sensor.
Is the action complete?
ÐVerify repairÐ