reset ISUZU KB P190 2007 Workshop User Guide
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Page 1870 of 6020
ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-253
DTC P161B (Flash Code 179)
Circuit Description
The ECM communicates with the immobilizer control
unit (ICU) to execute immobilizer function. The ECM
transmits a specific request signal to the ICU and the
ICU sends back a response signal to the ECM. Both
communication signals are carried out via a controller
area network (CAN) communication bus. If the ECM
receives a wrong response signal from the ICU, this
DTC will set.
Condition for Setting the DTC • The ECM receives a wrong immobilizer response signal from the ICU.
Action Taken When the DTC Sets • The ECM illuminates the SVS lamp when the diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C. (Euro 4 Specification) • The ECM illuminates the MIL when the diagnostic
runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
(Except Euro 4 Specification)
Condition for Clearing the DTC • Refer to DTC Type Definitions for Condition for Clearing the SVS Lamp/ DTC - Type C. (Euro 4
Specification)
• Refer to DTC Type Definitions for Condition for Clearing the MIL/ DTC - Type A. (Except Euro 4
Specification)
Diagnostic Aids • If an intermittent condition is suspected, refer to Intermittent Conditions in this section.
• Electromagnetic interference may affect intermittent condition.
Circuit/ System Testing DTC P161B
Step Action Value(s)Yes No
1 Did you perform the Diagnostic System Check -
Engine Controls? —
Go to Step 2 Go to Diagnostic
System Check -
Engine Controls
2 1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Monitor the DTC Information with a scan tool.
Is DTC P0633, U0001 or U0167 also set? —
Go to Applicable DTC Go to Step 3
3 Monitor the immobilizer DTC Information with a
scan tool.
Does the immobilizer DTCs fail this ignition which
begin with B or U? —
Go to Applicable
DTC in Immobilizer Section Go to Step 4
4 Program immobilizer security information into the
ECM. Refer to Resetting and Programming
Guidelines in immobilizer section.
Did you find and correct the condition? —
Go to Step 6 Go to Step 5
5 Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 6
—
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ISUZU KB P190 2007
Page 1964 of 6020
ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-347
Repair Instructions
Engine Control Module (ECM)
Replacement
Description
The following A - G steps provide an overview
procedure to replace and reprogram an ECM. Each A -
G steps is explained further in this section.
A. Recoding Fuel Injector ID Code
Each fuel injector is designated with 24 hexadecimal
characters (0 - 9 or A - F) that MUST be programmed
into the ECM for correct engine fueling for each specific
cylinder. These characters can be retrieved in one of
following places:
Retrieving the Fuel Injector ID Code Data from the
ECM
The current fuel injector ID code data can be retrieved
with a scan tool. If the old ECM cannot be
communicated with a scan tool, go to the next
procedure.
1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Select Diagnostics > appropriate vehicle identification > 4JK1 or 4JJ1 > Programming >
Injector ID Code.
4. Record 24 digits of each fuel injector ID code.
5. After complete the recording, turn OFF the scan tool.
6. Turn OFF the ignition.
Retrieving the Fuel Injector ID Code Data with a
Non-communicating ECM
If a scan tool does not communicate, the fuel injector ID
codes must be recorded from the factory affixed label
on the cylinder head cover or each fuel injector harness
connector housing. Recording from the label on cylinder head cover
Notice: Only perform this procedure if the fuel injectors
are not being replaced in the past.
1. Record all numbers of each cylinder on the label.
Legend 1. Cylinder #1 fuel injector ID code
2. Cylinder #2 fuel injector ID code
3. Cylinder #3 fuel injector ID code
4. Cylinder #4 fuel injector ID code
5. Injector ID code label
Recording from each fuel injector
1. Disconnect each fuel injector harness connector.
A. Record the fuel injector ID codes manually from the old ECM.
B. Reset the immobilizer security information in the old ECM. (If so equipped)
C. Replace the old ECM with the new ECM.
D. Program the immoblizer security information into the new ECM. (If so equipped)
E. Program the latest software and calibrations into the new ECM using the Service Programming System
(SPS).
F. Program the recorded fuel injector ID codes and the vehicle identification number (VIN) into the ECM using
a scan tool programming function.
G. Perform the fuel supply pump relearn procedure by allowing the engine to idle in Park or Neutral until
normal operating temperature is achieved.
RTW76ESH002501
1
2
3
4
5
4JJ1
5F
5F
5F
5F 05
F8
DE
DE 00
00
E6 F5 FB
F8
D2
DB 00
00
DC ED F7
E7
DE E8 08
02
00
02 F5
FC F4
F4 19
EC
CB
DE FF
ED
CA D1 04
EE E3
EA 49
B9
A1
B9
SAMPLE
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ISUZU KB P190 2007
Page 1965 of 6020
6E-348 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
2. Record all numbers of each cylinder on theharness connector housing. The correct order for
the fuel injector ID codes of the following
illustration is as follows:
5F 05 00 FB 00 F7 08 F5 19 FF 04 49
Legend
1. Fuel injector ID code
2. Fuel injector
B. Resetting Immobilizer Security Information (If so
equipped)
Reset immobilizer security information in the old ECM.
Refer to Resetting and Programming Guidelines in
immobilizer section. If the old ECM cannot be
communicated with a scan tool, go to the next produce.
C. Removal and Installation
Removal Procedure 1. Disconnect the negative battery cable.
2. Loosen bolts (7) and remove the ECM cover (6). (If so equipped)
3. Disconnect the ECM harness connectors.
4. Loosen nuts (1) and remove the ECM with bracket (2) from the base bracket (3).
5. Loosen bolts (4) and remove the ECM (5). Installation Procedure
1. Install the ECM (5) to the bracket (2) and tighten bolts (4).
2. Install the ECM with bracket (2) to the base bracket (3) and tighten nuts (1).
3. Connect the ECM harness connectors.
4. Install the ECM cover (6) and tighten bolts (7).
5. Connect the negative battery cable.
D. Programming Immobilizer Security Information
(If so equipped)
Programming immobilizer security information into the
ECM. Refer to Resetting and Programming Guidelines
in immobilizer section.
E. Programming Software and Calibrations
Program latest software/ calibrations if released. Refer
to Service Programming System (SPS) Description and
SPS (Remote Procedure) or SPS (Pass-Thru
Procedure) in this section.
F. Programming Fuel Injector ID Codes and VIN 1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Select Diagnostics > appropriate vehicle identification > 4JK1 or 4JJ1 > Programming >
Program ECU.
RTW76ESH002601
5F 05 00
FB 00 F7
SAMPLE
08 F5 19
FF 0 4 49
2
1
RTW76EMH000301
5
1
2
3
4
6
7
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ISUZU KB P190 2007
Page 1999 of 6020
6H-2 ENGINE SPEED CONTROL SYSTEM (4JK1/4JJ1)
Accelerator Pedal Position (APP) Sensor
Removal
1. Turn OFF the ignition.
2. Disconnect the APP sensor harness connector.
3. Loosen the accelerator pedal assembly nuts (3).
4. Remove the accelerator pedal assembly.
RTW 56ESH000301
5. Remove the APP sensor (1) from accelerator
pedal bracket (2).
Installation
1. Install the APP sensor (1) in accelerator pedal
bracket (2).
2. Install the accelerator pedal assembly.
3. Tighten the accelerator pedal assembly nuts (3).
4. Connect the APP sensor harness connector.
How to adjust for APP Sensor
1. Install the Tech2.
2. Turn ON the ignition.
3. Observe the APP sensor parameter.
Check the unique functionality of each sensor as shown in the table below.
APP
Sensor Pedal
Position Pedal
Position as
Observed on the Tech2 (%) Voltage as
Observed on the Tech2 (volt)
1 Pedal at
reset 0 0.1-1.2
1 Pedal at full
travel 100 3.8-4.8
2 Pedal at
reset 0 3.8-4.8
2 Pedal at
full travel 100 0.2-1.2
3 Pedal at
reset 0 3.8-4.8
3 Pedal at full
travel 100 1.2-2.2
4. If the problem was found, adjust as necessary.
101RY00011
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Page 2013 of 6020
ENGINE DIAGNOSIS (C24SE) 6-13
Fuel Consumption Excessive
Condition Possible cause Correction
Trouble in fuel system Mixture too rich or too lean due to
trouble in fuel injection system Refer to "Abnormal Combustion"
Fuel cut function does not act Refer to "Abnormal Combustion"
Trouble in ignition system Misfiring or abnormal combustion
due to trouble in ignition system Refer to Hard Start or Abnormal
Combustion Troubleshooting
Guide
Others Engine idle speed too high Reset Idle Air Control Valve
Returning of accelerator control
sluggish Correct
Fuel system leakage Correct or replace
Clutch slipping Correct
Brake drag Correct
Selection of transmission gear
incorrect Caution operator of incorrect gear
selection
Oil Problems
Condition Possible cause Correction
Oil pressure too low Wrong oil in use Replace with correct engine oil
Relief valve sticking Replace
Oil pump not operating properly Correct or replace
Oil pump strainer clogged Clean or replace strainer
Oil pump worn Replace
Oil pressure gauge defective Correct or replace
Crankshaft bearing or connecting
rod bearing worn Replace
Oil contamination
Wrong oil in use Replace with new engine oil
Oil filter clogged Replace oil filter
Cylinder head gasket damage Replace gasket
Burned gases leaking Replace piston and piston rings or
rebore cylinders
Oil not reaching valve system Oil passage in cylinder head or cylinder body clogged Clean or correct
Engine Oil Pressure Check
1. Check for dirt, gasoline or water in the engine
oil.
a. Check the viscosity of the oil.
b. Change the oil if the viscosity is outside the specified standard.
c. Refer to the "Maintenance and Lubrication" section of this manual.
2. Check the engine oil level. The level should fall somewhere between the
"ADD" and the "FULL" marks on the oil level
dipstick.
If the oil level does not reach the "ADD" mark on
the oil level dipstick, engine oil must be added.
3. Remove the oil pressure unit.
4. Install an oil pressure gauge.
5. Start the engine and allow the engine to reach normal operating temperature (About 80 °C).
6. Measure the oil pressure.
Oil pressure should be:
150 kPa(21.8 psi) at idle speed.
7. Stop the engine.
8. Remove the oil pressure gauge
9. Install the oil pressure unit.
10. Start the engine and check for leaks.
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Page 2174 of 6020
6E–4 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P0443 EVAPORATIVE (EVAP) EMISSION CONTROL
SYSTEM PURGE CONTROL CIRCUIT ..... 6E-191
Circuit Description ..................................... 6E-191
Diagnostic Aids .......................................... 6E-191
Diagnostic Trouble Code (DTC) P0443 EVAP Emission Control System Purge
Control Circuit .......................................... 6E-192
DIAGNOSTIC TROUBLE CODE (DTC) P0502 VEHICLE SPEED SENSOR (VSS) CIRCUIT
LOW INPUT ................................................ 6E-195
Circuit Description ..................................... 6E-195
Diagnostic Aids .......................................... 6E-195
Diagnostic Trouble Code (DTC) P0502 Vehicle Speed Sensor Circuit Low Input . 6E-196
DIAGNOSTIC TROUBLE CODE (DTC) P0562 SYSTEM VOLTAGE LOW .......................... 6E-202
Circuit Description ..................................... 6E-202
Diagnostic Aids .......................................... 6E-202
Diagnostic Trouble Code (DTC) P0562 System Voltage Low ............................................. 6E-202
DIAGNOSTIC TROUBLE CODE (DTC) P0563 SYSTEM VOLTAGE HIGH ......................... 6E-204
Circuit Description ..................................... 6E-204
Diagnostic Aids .......................................... 6E-204
Diagnostic Trouble Code (DTC) P0563 System Voltage High ............................................ 6E-204
DIAGNOSTIC TROUBLE CODE (DTC) P0601 ECM MEMORY CHECKSUM ..................... 6E-206
Circuit Description ..................................... 6E-206
Diagnostic Aids .......................................... 6E-206
Diagnostic Trouble Code (DTC) P0601 ECM Memory Checksum .................................. 6E-206
DIAGNOSTIC TROUBLE CODE (DTC) P0602 ECU PROGRAMMING ERROR ................. 6E-207
Circuit Description ..................................... 6E-207
Diagnostic Aids .......................................... 6E-207
Diagnostic Trouble Code (DTC) P0602 ECU Programming Error .................................. 6E-207
DTC P0650 MALFUNCTION INDICATOR LAMP (MIL) CONTOROL CIRCUIT MALFUNCTION 6E-208
Circuit Description ..................................... 6E-208
Diagnostic Aids .......................................... 6E-208
Diagnostic Trouble Code (DTC) P0650 Malfunction Indicator Lamp (MIL) Control
Circuit Malfunction ................................... 6E-209
DIAGNOSTIC TROUBLE CODE (DTC) P1167 FUEL SUPPLY SYSTEM RICH DURING
DECELERATION FUEL CUT OFF ............. 6E-211
Circuit Description ..................................... 6E-211
Diagnostic Aids .......................................... 6E-211
Diagnostic Trouble Code (DTC) P1167 Fuel Supply System Rich During
Deceleration Fuel Cutoff .......................... 6E-212
DIAGNOSTIC TROUBLE CODE (DTC) P1171 FUEL SUPPLY SYSTEM LEAN DURING
POWER ENRICHMENT ............................. 6E-214
Circuit Description ...................................... 6E-214
Diagnostic Aids .......................................... 6E-215
Diagnostic Trouble Code (DTC) P1171 Fuel Supply System Lean During Power
Enrichment .............................................. 6E-215
DIAGNOSTIC TROUBLE CODE (DTC) P1625 ECM SYSTEM RESET ............................... 6E-217
Circuit Description ...................................... 6E-217
Diagnostic Aids .......................................... 6E-217
Diagnostic Trouble Code (DTC) P1625 ECM System Reset .......................................... 6E-217
DIAGNOSTIC TROUBLE CODE (DTC) P1626 IMMOBILIZER NO SIGNAL ........................ 6E-218
Circuit Description ...................................... 6E-218
Diagnostic Aids .......................................... 6E-218
Diagnostic Trouble Code (DTC) P1626 Immobilizer No Signal .............................. 6E-219
DIAGNOSTIC TROUBLE CODE (DTC) P1631 IMMOBILIZER WRONG SIGNAL ............... 6E-222
Circuit Description ...................................... 6E-222
Diagnostic Aids .......................................... 6E-222
Diagnostic Trouble Code (DTC) P1631 Immobilizer Wrong Signal ........................ 6E-223
DIAGNOSTIC TROUBLE CODE (DTC) P1648 WRONG SECURITY CODE ENTERED .. 6E-224
Circuit Description ...................................... 6E-224
Diagnostic Aids .......................................... 6E-224
Diagnostic Trouble Code (DTC) P1648 Wrong Security Code Entered ............................ 6E-225
DIAGNOSTIC TROUBLE CODE (DTC) P1649 IMMOBILIZER FUNCTION NOT
PROGRAMMED ......................................... 6E-226
Circuit Description ...................................... 6E-226
Diagnostic Aids .......................................... 6E-226
Diagnostic Trouble Code (DTC) P1649 Immobilizer Function Not Programmed ... 6E-227
DIAGNOSTIC TROUBLE CODE (DTC) P1693 TACHOMETER OUTPUT LOW VOLTAGE 6E-228
Circuit Description ...................................... 6E-228
Diagnostic Aids .......................................... 6E-228
Diagnostic Trouble Code (DTC) P1693 Tachometer Output Low Voltage ............. 6E-229
SYMPTOM DIAGNOSIS ............................... 6E-232
PRELIMINARY CHECKS ............................. 6E-232
VISUAL/PHYSICAL CHECK ......................... 6E-232
INTERMITTENT ........................................... 6E-232
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Page 2219 of 6020
ENGINE DRIVEABILITY AND EMISSIONS 6E–49
Throttle Position Sensor (TPS)
The TPS is a potentiometer connected to throttle shaft
on the throttle body.
The engine control module (ECM) monitors the voltage
on the signal line and calculates throttle position. As the
throttle valve angle is changed when accelerator pedal
moved. The TPS signal also changed at a moved
throttle valve. As the throttle valve opens, the output
increases so that the output voltage should be high.
The throttle body has a throttle plate to control the
amount of the air delivered to the engine.
Engine coolant is directed through a coolant cavity in
the throttle body to warm the throttle valve and to
prevent icing.
Idle Air Control (IAC) Valve
The idle air control valve (IAC) valve is two directional
and gives 2-way control. With power supply to the coils
controlled steps by the engine control module (ECM),
the IAC valve's pintle is moved to adjust idle speed,
raising it for fast idle when cold or there is extra load
from the air conditioning or power steering.
By moving the pintle in (to decrease air flow) or out (to
increase air flow), a controlled amount of the air can
move around the throttle plate. If the engine speed is
too low, the engine control module (ECM) will retract the
IAC pintle, resulting in more air moving past the throttle
plate to increase the engine speed.
If the engine speed is too high, the engine control
module (ECM) will extend the IAC pintle, allowing less
air to move past the throttle plate, decreasing the
engine speed.
The IAC pintle valve moves in small step called counts.
During idle, the proper position of the IAC pintle is
calculated by the engine control module (ECM) based
on battery voltage, coolant temperature, engine load,
and engine speed.
If the engine speed drops below a specified value, and
the throttle plate is closed, the engine control module
(ECM) senses a near-stall condition. The engine control
module (ECM) will then calculate a new IAC pintle valve
position to prevent stalls.
If the IAC valve is disconnected and reconnected with
the engine running, the idle speed will be wrong. In this
case, the IAC must be reset. The IAC resets when the
key is cycled “On” then “Off”. When servicing the IAC, it
should only be disconnected or connected with the
ignition “Off”.
The position of the IAC pintle valve affects engine start-
up and the idle characteristic of the vehicle.
If the IAC pintle is fully open, too much air will be
allowed into the manifold. This results in high idle
speed, along with possible hard starting and lean air/
fuel ratio.
(1) Throttle Position Sensor
(2) Idle Air Control (IAC) Valve
1
2
C harac teris t ic of TPS -R ef erenc e-
0
0.5
1
1.5 2
2.5
3
3.5 4
4.5 5
0 10 2030 405060 7080 90100 Throt t le Angle (% ) (Tec h2 R eading)
Output Voltage (V)
StepCoilAB CDCoil A H igh
(ECM J1-28) On On
Coil A Low
(ECM J1-30) On On
Coil B H igh
(ECM J1-13) On On
Coil B Low
(ECM J1-29) On On
(IAC Valve Close Direction)
(IAC Valve Open Direction)
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Page 2241 of 6020
ENGINE DRIVEABILITY AND EMISSIONS 6E–71
F0: Diagnostic Trouble Code
The purpose of the “Diagnostic Trouble Codes” mode is
to display stored trouble code in the ECM.
When “Clear DTC Information” is selected, a “Clear
DTC Information”, warning screen appears.
This screen informs you that by cleaning DTC's “all
stored DTC information in the ECM will be erased”.
After clearing codes, confirm system operation by test
driving the vehicle.
Use the “DTC Information” mode to search for a specific
type of stored DTC information.
History
This selection will display only DTCs that are stored in
the ECM's history memory. It will not display Type B
DTCs that have not requested the MIL (“Check Engine Lamp”). It will display all type A and B DTCs that
requested the MIL and have failed within the last 40
warm-up cycles. In addition, it will display all type C and
D DTCs that have failed within the last 40 warm-up
cycles.
MIL SVC or Message Request
This selection will display only DTCs that are requesting
the MIL. Type C and Type D DTCs cannot be displayed
using the MIL. Type C and D DTCs cannot be displayed
using this option.
This selection will report type B DTCs only after the MIL
has been requested.
Last Test Failed
This selection will display only DTCs that have failed the
last time the test run. The last test may have run during
a previous ignition cycle of a type A or type B DTC is
displayed. For type C and type D DTCs, the last failure
must have occurred during the current ignition cycle to
appear as last test fail.
Test Failed Since Code Cleared
The selection will display all active and history DTCs
that have reported a test failure since the last time
DTCs were cleared. DTCs that last failed more that 40
warm-up cycles before this option is selected will not be
displayed.
No Run Since Code Cleared
This selection will display up to DTCs that have not run
since the DTCs were last cleared. Since any displayed
DTCs have not run, their condition (passing or failing) is
unknown.
Failed This Ignition
This selection will display all DTCs that have failed
during the present ignition cycle.
F1: Data Display
The purpose of the “Data Display” mode is to
continuously monitor data parameters.
The current actual values of all important sensors and
signals in the system are display through F1 mode.
See the “Typical Scan Data” section.
F2: Snapshot
“Snapshot” allows you to focus on making the condition
occur, rather than trying to view all of the data in
anticipation of the fault.
The snapshot will collect parameter information around
a trigger point that you select.
F3: Miscellaneous Test:
The purpose of “Miscellaneous Test” mode is to check
for correct operation of electronic system actuators.
F0: Diagnostic Trouble Code
F0: Read DTC Infor By Priority
F1: Clear DTC Information
F2: DTC Information
F0: History
F1: MIL SVS or Message Requested
F2: Last Test Failed
F3: Test Failed Since Code Cleared
F4: Not Run Since Code Cleared
F5: Failed This Ignition
F1: Data Display
F0: Engine Data
F1: O2 Sensor Data
F2: Snapshot
F3: Miscellaneous Test
F0: Lamps
F0: Malfunction Indicator Lamps
F1: Relays
F0: Fuel Pump Relay
F1: A/C Clutch Relay
F2: EVAP
F0: Purge Solenoid
F3: IAC System
F0: IAC Control
F1: IAC Reset
F4: Injector Balance Test
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Page 2243 of 6020
ENGINE DRIVEABILITY AND EMISSIONS 6E–73
20 A/C Request Yes/NoOffOff This displays the air conditioner request signal. Thisshould display “On” when the air conditioner switch is
switched on.
21 EVAP Purge Solenoid (Evaporative
Emission) %0 - 100 - 10 This displays the duty signal from the ECM to control the
canister purge solenoid valve.
22 Fuel Pump On/OffOnOn This displays operating status for the fuel pump main
relay. This should display “On” when the key switch is
turned on and while engine is running.
23 Idle Air Control Steps20 - 3065 - 75 This displays the ECM commanded position of the idle air control valve pintle. A larger number means that more air
is being commanded through the idle air passage.
24 Idle Speed Variation rpm-25 - 01125 - 1225 This displays variation of actual engine speed & desired idle speed.
25 Vehicle Speed km/h or mph00This displays vehicle speed. The vehicle speed is
measured by ECM from the vehicle speed sensor.
26 Ignition Voltage V10.0 - 14.510.0 - 14.5 This displays the system voltage measured by the ECM at ignition feed.
27 Reference Voltage V5.005.00
28 Malfunction Indicator
Lamp On/OffOffOff This displays operating status for the Check Engine
Lamp. This should display “On” when the Check Engine
Lamp is turned on.
29Time From Start--This displays the engine time elapsed since the engine
was started. If the engine is stopped, engine run time will
be reset to 00:00:00
Tech 2 ParameterUnitsIdle2000rpmDescription
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Page 2245 of 6020
ENGINE DRIVEABILITY AND EMISSIONS 6E–75
17 Fuel Trim Cell15 - 201 - 2 This displays dependent on engine speed and calculatedintake air flow reading. A plot of engine speed versus
intake air flow amount is divided into the cells. Fuel trim
cell indicates which cell is currently active.
18B1S1 O2 Sensor
(Bank1 Sensor 1)mV50 - 95050 -950 This displays the exhaust oxygen sensor output voltage. Should fluctuate constantly within a range between
10mV (lean exhaust) and 1000mV (rich exhaust) while
operating in closed loop.
19B1 Short Term Fuel
Trim (Bank 1)%-6 - 0-6 - 0 The short term fuel trim to a bank represents a short term correction to the bank fuel delivery by the ECM in
response to the amount of time the bank fuel control
oxygen sensor voltage spends above or below the
450mV threshold. If the oxygen sensor voltage has
mainly remained less than 450mV, indicating a lean air/
fuel, short term fuel trim will increase into the positive
range above 0% and the ECM will pass fuel. If the
oxygen sensor voltage stays mainly above the threshold,
short term fuel trim will decrease below 0% into the
negative range while the ECM reduces fuel delivery to
compensate for the indicated rich condition. Under
certain conditions such as extended idle and high
ambient temperatures, canister purge may cause short
term fuel trim to read in the negative range during normal
operation. Fuel trim values at maximum authority may
indicate an excessively rich or lean system.
20B1 Long Term Fuel
Trim (Bank 1)%-10 - 0-5 - 0 The long term fuel trim is delivered from the short term fuel term values and represents a long term correction of
fuel delivery for bank in question. A value of 0% indicates
that fuel delivery requires no compensation to maintain
the ECM commanded air fuel ratio. A negative value
indicates that the fuel system is rich and fuel delivery is
being reduced (decreased injector pulse width). A
positive value indicates that a lean condition exists and
the ECM is compensating by add fuel (increased injector
pulse width). Because long term fuel trim tends to follow
short term fuel trim, a value in the negative range due to
canister purge at idle should not be considered unusual.
Fuel trim values at maximum authority may indicate an
excessively rich or lean system.
21Injection Pulse Widthms3.0 - 1.03.0 - 4.0 This displays the amount of time the ECM is commanding each injector On during each engine cycle.
A longer injector pulse width will cause more fuel to be
delivered. Injector pulse width should increase with
increased engine load.
22Power EnrichmentYe s / N oNoNo The ECM provides the extra amount of fuel when it detects a rapid increase in the throttle position and air
flow (Power Enrichment). Under this condition the ECM
should detect a “rich condition (high oxygen sensor
voltage).
23Deceleration Fuel
Cutoff Active/
InactiveInactiveInactiveThe ECM reduces the amount of fuel injected when it
detects a decrease in the throttle position and the air
flow. When deceleration is very fast, the ECM may cut off
fuel completely. Until enable conditions meet the engine
revolution less than 1000rpm or MAP less than 10kPa.
24Time From Start--This displays the engine time elapsed since the engine
was started. If the engine is stopped, engine run time will
be reset to 00:00:00
Tech 2 ParameterUnitsIdle2000rpmDescription
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