glow ISUZU TF SERIES 2004 User Guide

6E–4 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
MALFUNCTION ....................................... 6E-196
DIAGNOSTIC TROUBLE CODE (DTC) P0251
(SYMPTOM CODE 7) (FLASH CODE 53)
INJECTION PUMP MALFUNCTION ....... 6E-196
DIAGNOSTIC TROUBLE CODE (DTC) P0251
(SYMPTOM CODE 9) (FLASH CODE 53)
INJECTION PUMP MALFUNCTION ....... 6E-196
DIAGNOSTIC TROUBLE CODE (DTC) P0251
(SYMPTOM CODE A) (FLASH CODE 53)
INJECTION PUMP MALFUNCTION ....... 6E-196
DIAGNOSTIC TROUBLE CODE (DTC) P0251
(SYMPTOM CODE B) (FLASH CODE 53)
INJECTION PUMP MALFUNCTION ....... 6E-196
DIAGNOSTIC TROUBLE CODE (DTC) P0251
(SYMPTOM CODE D) (FLASH CODE 53)
INJECTION PUMP MALFUNCTION ....... 6E-196
DIAGNOSTIC TROUBLE CODE (DTC) P0251
(SYMPTOM CODE E) (FLASH CODE 53)
INJECTION PUMP MALFUNCTION ....... 6E-196
Circuit Description ..................................... 6E-197
Diagnostic Aids .......................................... 6E-197
Diagnostic Trouble Code (DTC) P0251
(Symptom Code 6) (Flash Code 53)
Injection Pump Malfunction ..................... 6E-197
Diagnostic Trouble Code (DTC) P0251
(Symptom Code 7) (Flash Code 53)
Injection Pump Malfunction ..................... 6E-199
Diagnostic Trouble Code (DTC) P0251
(Symptom Code 9) (Flash Code 53)
Injection Pump Malfunction ..................... 6E-203
Diagnostic Trouble Code (DTC) P0251
(Symptom Code A) (Flash Code 53)
Injection Pump Malfunction ..................... 6E-204
Diagnostic Trouble Code (DTC) P0251
(Symptom Code B) (Flash Code 53)
Injection Pump Malfunction ..................... 6E-205
Diagnostic Trouble Code (DTC) P0251
(Symptom Code D) (Flash Code 53)
Injection Pump Malfunction ..................... 6E-206
Diagnostic Trouble Code (DTC) P0251
(Symptom Code E) (Flash Code 53)
Injection Pump Malfunction ..................... 6E-207
DIAGNOSTIC TROUBLE CODE (DTC) P0335
(SYMPTOM CODE B) (FLASH CODE 43)
CRANKSHAFT POSITION SENSOR
CIRCUIT MALFUNCTION ....................... 6E-208
DIAGNOSTIC TROUBLE CODE (DTC) P0335
(SYMPTOM CODE D) (FLASH CODE 43)
CRANKSHAFT POSITION SENSOR
MALFUNCTION ....................................... 6E-208
DIAGNOSTIC TROUBLE CODE (DTC) P0335
(SYMPTOM CODE E) (FLASH CODE 43)
ENGINE SPEED INPUT CIRCUITRANGE/PERFORMANCE ....................... 6E-208
Circuit Description ...................................... 6E-209
Diagnostic Aids .......................................... 6E-209
Diagnostic Trouble Code (DTC) P0335
(Symptom Code B) (Flash Code 43)
Crankshaft Position Sensor Circuit
Malfunction .............................................. 6E-209
Diagnostic Trouble Code (DTC) P0335
(Symptom Code D) (Flash Code 43)
Crankshaft Position Sensor Malfunction .. 6E-209
Diagnostic Trouble Code (DTC) P0335
(Symptom Code E) (Flash Code 43) Engine
Speed Input Circuit Range/Performance . 6E-214
DIAGNOSTIC TROUBLE CODE (DTC) P0380
(SYMPTOM CODE 4) (FLASH CODE 66)
GLOW RELAY CIRCUIT VOLTAGE LOW 6E-217
DIAGNOSTIC TROUBLE CODE (DTC) P0380
(SYMPTOM CODE 8) (FLASH CODE 66)
GLOW RELAY CIRCUIT VOLTAGE HIGH 6E-217
Circuit Description ...................................... 6E-217
Diagnostic Aids .......................................... 6E-217
Diagnostic Trouble Code (DTC) P0380
(Symptom Code 4) (Flash Code 66)
Glow Relay Circuit Voltage Low .............. 6E-218
Diagnostic Trouble Code (DTC) P0380
(Symptom Code 8) (Flash Code 66) Glow
Relay Circuit Voltage High ....................... 6E-221
DIAGNOSTIC TROUBLE CODE (DTC) P0381
(SUB CODE 4) (FLASH CODE 67) GLOW PLUG
INDICATOR CIRCUIT VOLTAGE LOW .. 6E-222
DIAGNOSTIC TROUBLE CODE (DTC) P0381
(SUB CODE 8) (FLASH CODE 67) GLOW PLUG
INDICATOR CIRCUIT VOLTAGE HIGH . 6E-222
Circuit Description ...................................... 6E-222
Diagnostic Aids .......................................... 6E-222
Diagnostic Trouble Code (DTC) P0381
(Symptom Code 4) (Flash Code 67) Glow
Plug Indicator Circuit Voltage Low ........... 6E-222
Diagnostic Trouble Code (DTC) P0381
(Symptom Code 8) (Flash Code 67) Glow
Plug Indicator Circuit Voltage High .......... 6E-226
DIAGNOSTIC TROUBLE CODE (DTC) P0400
(SYMPTOM CODE 3) (FLASH CODE 32)
EXHAUST GAS RECIRCULATION FLOW
EXCESSIVE DETECTED ........................ 6E-227
DIAGNOSTIC TROUBLE CODE (DTC) P0400
(SYMPTOM CODE 4) (FLASH CODE 32)
EXHAUST GAS RECIRCULATION CIRCUIT
SHORT TO GROUND OR OPEN CIRCUIT 6E-227
DIAGNOSTIC TROUBLE CODE (DTC) P0400
(SYMPTOM CODE 5) (FLASH CODE 32)
EXHAUST GAS RECIRCULATION FLOW
INSUFFICIENT DETECTED .................... 6E-227

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–41
No. Connector face No. Connector face
C-118
A/C Resister & Neutral switchE-23
Gray Idle SW
C-123 E-41
Black Coolant temp sensor
C-124 E-44
Gray Vehicle speed sensor
E-3
Black Magnetic clutch AC COMPE-49
Gray Glow plug
E-6 E-51
Black Inhibiter switch
E-9 H-4
White Engine room ~ Mission
E-10
Silver Engine groundH-6
White Engine room ~ INST
E-11
Natural
green Neutral switchH-7
White Engine room ~ INST
E-12
Natural
green Neutral switchH-18
White Engine room ~ INST
E-22
Brown TPS 1 mainH-22
White Engine ~ Engine room C

6E–42 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
No. Connector face No. Connector face
H-33
Engine ~ Engine roomX-16
Black DIODE
P-1
Silver Battery (+)X-17
Black DIODE
P-2
Silver Relay & Fuse box
P-5
Silver Battery (-)
P-6
Silver Body earth (Ground)
P-10
Silver Engine ground
X-5
Black Relay ; Glow
X-13
Black Relay ; ECM MAIN
X-14
Black Relay; A/C Compressor
X-15
Black Relay; Thermo

6E–44 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
RELAY A ND FUSE BOX LOCATION (LHD & RHD)
RELAY & FUSE BOX
RELAY
No .RELAY
(4JA1-TC/4JH1-TC)
X -1 RELAY; TAIL LIGHT
X -2 RELAY; FRT F OG LI GHT
X -3 RELAY; HORN
X -4 RELAY; DIMMER
X -5 RELAY; GLOW
X -6 RELAY; COND, FAN
X -7 RELAY; RR FOG
X -8 RELAY; STARTER
X -9 SHORT CONNECTOR
(with Co oler) (LHD)
RELAY; HAZARD-RH (RHD)
X-10 SHORT CONNECTOR
(with Co oler) (LHD)
RELAY; HAZARD-LH (RHD)
X -11 RELAY; HEATER
X-12 RELAY; HEAD LIGHT
X-13 RELAY; ECM MAIN
X-14 RELAY; A/C COMP
X-15 RELAY; THERMO
FUSE
SLOW BLOW FUSE
NO.FUSE
(4JA1-TC/4JH1-TC)
EB-1 10A ECM
EB-2 10A RR FOG
EB-3 15A FRT FOG
EB-4 —
EB-5 10A ILLUMI & TAIL-RH
EB-6 10A TAIL-LH
EB-7 10A H/LIGHT RH-LOW
EB-8 10A H/LIGHT LH-LOW
EB-9 10A TRA ILER
EB-10 10A AC G (S)
EB-11 10A H/LIGHT RH-HIGH
EB-12 10A H/LIGHT LH-HIGH
EB-13 10A A/C
EB-14 10A 4WD
EB-15 10A HORN
EB-16 10A HAZARD
NO.SLOW BLOW FUSE
4JA1-TC/4JH1-TC
SBF-1 80A MAIN
SBF-2 20A COND, FAN
SBF-3 50A GLOW
SBF-4 30A ECM
SBF-5 40A IG 1
SBF-6 40A ABS-1
SBF-7 30A ABS-2
SBF-8 30A BLOWER
SBF-9 50A IG 2

6E–54 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
41 41 A/C Compresso r
Re la yWH T/
GRNLess than
1V10-14V A/C comp. is operated:
L e s s t h a n 1 V
A/C comp. is not oper-
ated: 10 - 14VCo nnect DC V 41 GND
42 42 Che ck Engine La mp GRN/
YELLess than
1VLamp is turned on: Less than 1V
Lamp is turned off: 10-14VCo nnect DC V 42 GND
43 43 Glow La mp ORG/
BLULess than
1VLamp is turned on: Less than 1V
Lamp is turned off: 10-14VCo nnect DC V 43 GND
44 44 No Conne ctio n - - - - - - - - -
45 45 To Da ta Link Co nnec-
to r No . 6BLU Less than
1V10-14V Co nnect DC V 45 GND
46 46 No Conne ctio n - - - - - - - - -
47 47 No Conne ctio n - - - - - - - - -
48 48 No Conne ctio n - - - - - - - - -
49 49 Throttle Po sitio n Sen-
so r (TPS) Gro undBLK/
GRNIdle :
Approx.
0.4K ohm /
WOT:
Approx.
4.0K ohm---Discon-
ne ctOhm 38 49
50 50 No Conne ctio n - - - - - - - - -
51 51 No Conne ctio n - - - - - - - - -
52 52 No Conne ctio n - - - - - - - - -
53 53 No Conne ctio n - - - - - - - - -
54 54 No Conne ctio n - - - - - - - - -
55 55 No Conne ctio n - - - - - - - - -
56 56 No Conne ctio n - - - - - - - - -
57 57 Throttle Po sitio n Sen-
sor (TPS) Po wer Sup-
plyRED/
GRNLess than
1VAppro x . 5V Co nnect DC V 57 49
58 58 ECM Re lay BLU/
BLK10-14V Less than 1V Connect DC V 58 GND
59 59 No Conne ctio n - - - - - - - - -
60 60 No Conne ctio n - - - - - - - - -
61 61 No Conne ctio n - - - - - - - - -
62 62 No Conne ctio n - - - - - - - - -
63 63 ECM Power Supply Less than
1V10-14V - DC V 63 GND
64 64 No Conne ctio n - - - - - - - - -
65 65 Bra ke Switch 2 Signa l WHT/
BLKLess than
1VPedal is not stepped on: 10-14V
Pedal is stepped on: Less than 1VCo nnect DC V 65 GND
66 66 No Conne ctio n - - - - - - - - -
67 67 No Conne ctio n - - - - - - - - -
68 68 Vehicle Spe ed Se n-
so r (VSS)YEL/
GRN- Approx . 14.5Hz by wav e fo rm or
approx. 6.0V at vehicle speed 20km/hCo nnect AC V 68 GND
69 69 Idle Switch GRN/
BLKLess than
1VPedal is not stepped on: Less than 1V
Pedal is stepped on: Approx. 5VCo nnect DC V 69 GND
70 70 No Conne ctio n - - - - - - - - -
71 71 No Conne ctio n - - - - - - - - -
72 72 No Conne ctio n - - - - - - - - -
73 73 No Conne ctio n - - - - - - - - -
74 74 No Conne ctio n - - - - - - - - -Signal or Continuity Tester Position
Pin
No. B/Box
No.Pin Function Wire
ColorKey SW
OffKey SW
OnEngine
IdleEngine
2000rpmECM
Connec-
tionRange (+) (-)

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–55
75 75 No Conne ctio n - - - - - - - - -
76 76 No Conne ctio n - - - - - - - - -
77 77 No Conne ctio n - - - - - - - - -
78 78 No Conne ctio n - - - - - - - - -
79 79 No Conne ctio n - - - - - - - - -
80 80 No Conne ctio n - - - - - - - - -
81 81 No Conne ctio n - - - - - - - - -
82 82 No Conne ctio n - - - - - - - - -
83 83 Ma ss Air Flo w (MAF)
Se nso r Po wer SupplyWH T/
REDLess than
1VAppro x . 5V Co nnect DC V 83 92
84 84 Intake Air Tempera-
ture (IAT) Sensor Sig-
na lBLK/
BLULess than
1V0 deg. C: Approx. 3.6V / 20 deg. C:
Approx. 2.6V / 40 deg. C: Approx.
1.7V / 60 deg. C: 1.1V / 80 deg. C:
0.7VCo nnect DC V 84 92
85 85 No Conne ctio n - - - - - - - - -
86 86 No Conne ctio n - - - - - - - - -
87 87 Neutral Switch BLK/
WH TLess than
1VIn neutral: Less than 1V
Other than neutral: 10-14VCo nnect DC V 87 GND
88 88 Ma ss Air Flo w (MAF)
Se nso r SignalGRN/
REDLess than
1VAppro x . 1V Appro x .
1.8VApprox.
2.5VCo nnect DC V 88 92
89 89 Engine Coolant Tem-
perature (ECT) Sen-
so r S ig na lGRY Less than
1V0 deg. C: Approx. 4.4V / 20 deg. C:
Approx. 3.8V / 40 deg. C: Approx.
2.9V / 60 deg. C: 2.1V / 80 deg. C:
1.4VCo nnect DC V 89 93
90 90 CKP Se nso r Signal RED - - Appro x .
47Hz by
w a v e fo rm Approx.
134Hz by
wave form
or approx.
1.1VCo nnect AC V 90 98
91 91 CKP Senso r Output
To Pump Co ntrol Unit
(PSG) No.8PNK - - Appro x .
47Hz by
w a v e fo rm Approx.
134Hz by
wave form
or approx.
0.7VCo nnect AC V 91 GND
92 92 Ma ss Air Flo w (MAF)
Se nsor GroundBLK/
REDContinuity
with
gro und- - - Connect Ohm 92 GND
93 93 Engine Coolant Tem-
perature (ECT) Sen-
so r Gro undBLK/
PNKContinuity
with
gro und- - - Connect Ohm 93 GND
94 94 Glo w Relay BLK/
REDLess than
1VGlow system is operated: Less than
1 V
Glow system is not operated: 10 - 14VCo nnect DC V 94 GND
95 95 No Conne ctio n - - - - - - - - -
96 96 No Conne ctio n - - - - - - - - -
97 97 EGR EVRV BLK/
ORG- - Approx. 140Hz by wave
fo rm whe n EVRV is
operated----
98 98 CKP Se nsor Ground WHT Continuity
with
gro und- - - Connect Ohm 98 GND
99 99 CAN (Contro ller Are a
Ne two rk) to PSG No .1BLU--------
100 100 CAN (Contro ller Are a
Ne two rk) to PSG No .2YEL--------Signal or Continuity Tester Position
Pin
No. B/Box
No.Pin Function Wire
ColorKey SW
OffKey SW
OnEngine
IdleEngine
2000rpmECM
Connec-
tionRange (+) (-)

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–61
89 89 Engine Coolant Tem-
perature (ECT) Sen-
sor Signa lGRY Le ss
tha n 1V0 deg. C: Approx. 4.4V / 20 deg. C:
Approx. 3.8V / 40 deg. C: Approx.
2.9V / 60 deg. C: 2.1V / 80 deg. C:
1.4VCo nnect DC V 89 93
90 90 CKP Senso r Signal RED - - Approx .
47Hz by
wave
form Approx.
134Hz by
wave
fo rm or
approx.
1.1VCo nnect AC V 90 98
91 91 CKP Sensor Output
To Pump Contro l Unit
(PSG) No.8PNK - - Approx .
47Hz by
wave
form Approx.
134Hz by
wave
fo rm or
approx.
0.7VCo nnect AC V 91 GND
92 92 Ma ss Air Flow (MAF)
Se nso r Gro undBLK/
REDCo ntinu-
ity with
ground- - - Connect Ohm 92 GND
93 93 Engine Coolant Tem-
perature (ECT) Sen-
so r & Ma nifo ld
Pressure Sensor
GroundBLK/
PNKCo ntinu-
ity with
ground- - - Connect Ohm 93 GND
94 94 Glo w Re la y BLK/
REDLe ss
tha n 1VGlow system is operated: Less than
1 V
Glow system is not operated: 10 -
14VCo nnect DC V 94 GND
9595No Connection---------
96 96 Turbo charge r Wa ste-
ga te Contro l EVRVBRW/
RED- - Wav e form - - - -
97 97 EGR EVRV BLK/
ORG- - Appro x. 140Hz by
wa ve fo rm whe n
EVRV is operated- ---
98 98 CKP Se nso r Ground WHT Co ntinu-
ity with
ground- - - Connect Ohm 98 GND
99 99 CAN (Contro lle r Area
Ne two rk) to PSG
No .1BLU--------
100 100 CAN (Contro lle r Area
Ne two rk) to PSG
No .2YEL--------
101 101 CKP Senso r Shie ld
LineBLK Co ntinu-
ity with
ground- - - Connect Ohm 101 GND
102102No Connection---------
103103No Connection---------
104104No Connection---------
105 105 Solenoid Valve Shut
Off (MAB) Output
Signa l to PSG No .5ORG --------Signal or Continuity Tester Position
Pin
No. B/
Box
No.Pin Function Wire
ColorKey SW
OffKey SW
OnEngine
IdleEngine
2000rpmECM
Connec-
tionRan
ge(+) (-)

6E–64 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
GENERAL DESCRIPTION FOR ECM AND
SENSORS
Engine Control Module (ECM)
The engine control module (ECM) is located flower
panel just under the passenger's seat.
The fuel quantity and injection timing related functions
are controlled by the pump control unit (PSG).
The engine control module (ECM) performs the
following functions.
Control of the ex haust gas re-circulation (EGR)
Control of the quick on start (QOS) glow control
system
Control of the A/C compressor
Ex ecution of the immobilizer function
Pump Control Unit (PSG) & Data Exchange
Between Control Module
The radial plunger distributor type injection pump uses
two control modules to ex ecute full control of the enginemanagement system.
Engine Control Module (ECM)
Pump Control Unit (PSG) = Pumpen Steuer Great
(German)
The pump control unit (PSG) receives signals from the
sensors inside the pump to determine the cam ring
rotation angle, the pump speed and the fuel
temperature .
These values are then compared to the desired values
sent by the engine control module (ECM) such as the
desired injection timing and the desired fuel injection
quantity.
The engine control module (ECM) processes all engine
data and data regarding the surrounding environment
received from ex ternal sensors to perform any engine
side adjustments.
Maps for both are encoded in both control units. The
control units input circuit process sensor data.
A Microprocessor then determines the operating
conditions and calculates set values for optimum
running.
The interchange of data between the engine control
module (ECM) and the pump control unit (PSG) is
perfumed via a CAN-bus system. The abbreviation CAN
stands for Controller Area Network. By having two
separate control modules, the high pressure solenoid
valve. This prevents the discharge of any disturbing
signals.
The information ex change between the two control
modules takes place via two means.
Via analogue signal leads
Via the CAN-bus
The analogue signal leads are used to ex change the
following information.
Engine speed signal (ECM terminal 91)
Pump Speed (ECM terminal 105)
Fuel Cutoff solenoid valve signal (MAB signal) (ECM
terminal 105)
The engine speed signal is sent from the ECM to PSG
based on the input from the crank shaft position (CKP)
sensor.
The analogue CKP sensor signal is converted by the
ECM into a square wave signal.
The fuel cutoff solenoid valve signal is also referred to
as MAB signal.
MAB in this case, refers to the German abbreviation
Magnet ventil ABschaltung that stands for high pressure
solenoid v alv e cut off.
The MAB signal wire is used for two purposes.
-As a reference for the engine control module (ECM) for
the pump speed (back up for the CKP sensor).
-To turn Off the engine.
Sel f Dia gn osis / Interfa ce / Si gn al
To High Pressure Solenoid
Engine Speed
Injection Timing
Accelerator Pedal
Injection Quantity
In ta ke Air Temperat ure
Response Signal
Ma ss Air Flow
Additional Signal
Others

Additional Operations To Timing Control Valve (TCV)
Engin e
Con trol
Modu le
(ECM) Cam Rin g Rota tiona l Angle
Fuel Temper atu re
High Pressure
Solenoid Valve
Pump
Con tr ol Fuel Inject ion
Unit (Mechanical)
(PSG)

Ti m i n
g Devi ce

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–87
F0: Diagnostic Trouble Code
The purpose of the “Diagnostic Trouble Codes” mod e i s
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.
Symptom Code:
This number or alphabet means identification of the
malfunction. Each DTC includes plural symptoms, such
as DTC P0100 has four kinds of symptom code (7), (9),
(B) and (C). DTC chart (check procedure) is separated
depending on the symptom code.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.
F4: Programming (Factory Use Only)
The purpose of “Programming” is to program VIN in the
ECM and lock the programmed data. F0: Diagnostic Trouble Codes
F0: Read DTC Infor As Stored By ECU
F1: Clear DTC Information
F1: Data Display
F2: Snapshot
F3: Miscellaneous Test
F0: Lamps
F0: Glow Time Telltale Test
F1: Relays
F0: Glow Time Relay Test
F2: Solenoids
F0: EGR Solenoid Test
F3: Engine Speed (RPM) Control
F4: Programming
F0: Program VIN
F1: Lock ECU
Read DTC Infor A s Stored By ECU

P0100 Present
(7) Mass Air Flow (MAF) Sensor
Voltage Supply Circuit High Input
DTC No.
Symptom Code

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–89
18 Brake Switch 2 Active/
InactiveInactive Inactive Inactive This displays operating status of the brake switch. This
should display "Active" when the brake pedal is stepped
on.
19 Clutch Sw itch Activ e /
InactiveInactive Inactive Inactive This displays operating status of the clutch switch. This
should display "Active" when the clutch pedal is stepped
on.
20 Neutra l Switch On/Off On On On This displa ys o pe rating status of the neutra l switch. This
should display "On" when the gear position is neutral.
21 A/C Informa tion
SwitchActive 12V/
Inactive 0VInactive 0V Inactive 0V Inactive 0V This displays the air conditioner request signal. This
should display "Active 12V" when the air conditioner switch
is switched on.
22 Dia gnostic Re quest Activ e 0V/
Inactive 12VIna ctiv e
12VInactive
12VIna ctiv e
12VThis display s the dia gnostic reque st signal. This sho uld
display "Inactive 12V" when the Tech 2 is connected.
23 System Voltage V 10 - 14 10 - 14 10 - 14 This displays the system voltage measured by the ECM at
ignition feed.
24 Ma in Re la y Activ e /
InactiveActive Active Active This displays operating status for the ECM main relay. This
should display "Active" when the key switch is turned on
and while engine is running.
25 Glow Time Relay Activ e 0V/
Inactive12VIna ctiv e
12VInactive
12VIna ctiv e
12VThis displays operating status for the glow relay. This
should display "Inactive 12V" when the engine is warm
uppe d.
26 Check Engine Light On/Off Off Off Off This displays operating status for the Check Engine Lamp.
This should display "On" when the Check Engine Lamp is
turned on.
27 Glow Time Telltale On/Off Off Off Off This displays operating status for the glow indicator lamp.
This sho uld display "On" whe n the glo w la mp is turne d o n.
28 Desired Engine Idle
Speedrpm 730 730 730 The desired engine idle speed that the ECM commanding.
The ECM compensates for various engine loads based on
engine coolant temperature.
29 A/C Re que st Activ e 0V/
Inactive 12VIna ctiv e
12VInactive
12VIna ctiv e
12VThis displays operating status of the A/C compressor. This
should display "Active 0V" when the compressor relay is
operated.
30 Immo bilize r Activ e /
InactiveInactive Inactive Inactive This should display "Inactive" when the immobilizer is
correctly operated.
31 Immo bilize r Signal Rece iv ed/
Not
Rece iv edNo t
Receive dNo t
Re ceive dNot
Re ce iv e dThis sho uld displa y "No t Receive d" whe n the immo bilize r is
not activated.
32 Immo bilize r Function
ProgrammedYes/ No Yes Yes Yes This should display "Yes" when the immobilizer is correctly
programmed.
33 EGR Pulse Ratio
(Ex ha ust Ga s
Recirculatio n)% 70 70 70 This displays the duty signal from the ECM to control the
EGR flow amount. Tech 2 Parameter Units Idle 1500rpm 2000rpm Description