air condition ISUZU TROOPER 1995 Workshop Manual

AUTOMATIC TRANSMISSION (4L30-E) 7A-79
DIAGNOSTIC TROUBLE CODE (DTC) 13
ENGINE SPEED FAILURE
Install scan tool.
GOTHROUGH
TECH 1 CONNECTION.
I
• Engine running at idle.
• Brake applied.
• Selector lever
position "N" or "P", • Selector "FO: DATA LIST: AT INPUT SPEED".
IF: TECH1 DISPLAY approximately 800 RPM:
I
$
This system is functioning correctly. The problem is probably intermittent. GOTO
I IF: Tachometer displays engine speed? I
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$ c§J
INTERMITTENT CONDITIONS.
r---------------------------------~----~ • Check wire for open or short to ground or short to voltage between Transmission Control Module (TCM) and connector C-90 & C-91, and connector C-91 terminal D12 and ignition control module connector E-21 terminal 4, and check intermediate connector H-5 terminal 5.
• Repair harness. If still not working: GOTO TCM MEM-CAL REPLACEMENT.
• Check wire for open or short to ground or short to voltage between Tachometer connector 1-9 terminal 3 and ignition control module connector E-21 terminal 4 or between these terminals and
intermediate connector H-24
terminal 4. • Repair harness. If still not working: Check Engine electrical section. If still problem, replace ignition control module.

AUTOMATIC TRANSMISSION (4L30-E) 7 A-81
DIAGNOSTIC TROUBLE CODE (DTC) 15
TRANSMISSION OIL TEMPERATURE SHORT TO PLUS OR OPEN
Install scan tool.
GOTHROUGH
TECH1 CONNECTION.
• Ignition switch ON. Engine not running. • Selector lever position "P". • Select "FO: DATA LIST: Trans. Oil Temp". IF: TECH1 DISPLAY more than 4.74 Volts:
•
Connect voltmeter between connector C-90 terminal 83 and connector C-91 ground terminal C1.
IF: If you have more than approximately 4.74 Volts:
• Check
for a short to plus or open between connector C-90 terminal 83 and connector C-91 terminal C14. This faulty connection can be at the connector M-6 terminal 3 (C) or 5 (D). This faulty connection can be
at the intermediate connector
H-1 0 terminals 3 or 11. • Repair If not OK: Disconnect sensor.
• Connect ohmmeter between sensor terminals 3(C) and 5(D).
Refer
to the table of the resistance function of the
temperature.
If resistance not correct, replace the transmission oil temperature sensor.
DTC 15 is intermittent. GOTO INTERMITTENT CONDITIONS.
GOTO TCM MEM-CAL REPLACEMENT.

AUTOMATIC TRANSMISSION (4L30-E) 7 A-83
DIAGNOSTIC TROUBLE CODE (DTC) 16
TRANSMISSION OIL TEMPERATURE SHORT TO GROUND
Install scan tool.
GOTH ROUGH
TECH1 CONNECTION.
• Ignition switch ON. Engine not running.
• Selector lever position "P". • Select "FO: DATA LIST: Trans. Oil Temp".
IF: TECH1 DISPLAY less than 0.4 Volts:
• Connect
voltmeter between connector C-90 terminal 83 and connector C-91 ground terminal C1. IF: If you have less than approximately 0.4 Volts:
• Check
for a short to ground between
connector C-90 terminal 83 and
connector M-6 terminal 3 {C). This faulty connection can be at the
intermediate connector
H-10 terminal 3.
• Repair If not OK: Disconnect sensor. • Connect ohmmeter between sensor terminals 3{C) and 5{D).
Refer
to the table of the resistance
function of the temperature {DTC 15).
If resistance not correct, replace sensor.
DTC 16 is intermittent. GOTO INTERMITTENT CONDITIONS.
GOTO TCM MEM-CAL REPLACEMENT.

AUTOMATIC TRANSMISSION (4L30-E) 7 A-87
DIAGNOSTIC TROUBLE CODE (DTC) 22
THROTTLE POSITION SENSOR SHORT TO GROUND
Check Engine Control Module (ECM) DTC.
IF: DTC on Throttle Position Sensor (TPS) exists:
Check diagnosis
of ECM and repair. • Install scan tool GOTHROUGH TECH1 CONNECTION. • Ignition switch ON, engine not running. • Selector lever position uP".
• Select FO: DATA LIST: "TPS SIGNAL". IF: TECH1 DISPLAY less than 0.2 volts:
• Connect voltmeter between connector C-91 terminal C5 and TPS ground
terminal C6.
IF: If you have less than 0.2 volts:
• Check for a short to ground between connector C-91 terminal C5 and
connector E-5 terminal 3. This faulty connection can be at the intermediate connector H-5 terminal 10.This faulty connection can be at the ECM connector C-2 terminal D6.
• Repair If not OK: Ignition switch OFF. Disconnect sensor connector E-5. • Connect ohmmeter between sensor terminals 3 wiper and 1 low side.
• If resistance between TPS terminal 3 and 1 does not change when
the throttle valve angle is changed: Replace TPS.
DTC 22 is intermittent. GOTO INTERMITTENT
CONDITIONS.

AUTOMATIC TRANSMISSION (4L30-E) 7 A-89
DIAGNOSTIC TROUBLE CODE (DTC) 23
THROTTLE POSITION SENSOR CONNECTOR OPEN
Check Engine Control Module (ECM)
DTC.
IF: DTC on Throttle Position Sensor (TPS) exists:
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Check diagnosis of ECM and repair. • Install scan tool GOTHROUGH TECH1 CONNECTION.
• Ignition switch ON, engine not running.
• Selector lever position "P". • Select FO: DATA LIST: "TPS SIGNAL". IF: TECH 1 DISPLAY approx. 2.5 volts whatever the throttle valve position:
IF: TPS connector E-5 on I the engine is open: DTC 23 is intermittent. GOTO INTERMITTENT
CONDITIONS.
~
NO
Repair. j
• Ignition switch OFF. Disconnect connector C-91. Connect ohmmeter between connector C-91 terminals C5 and C6. If open circuit: • Check for an open between connector C-91 terminal C5 to connector E-5 terminal 3 with a simultaneous open of the terminal C6 to the connector E-5 terminal1. This faulty connection can be at the intermediate connector H-5 terminal 10 and 11.
• Repair. If not OK: Ignition switch OFF. Disconnect sensor.
• Connect ohmmeter between sensor terminals 3 wiper and 1 low side. If resistance between TPS terminal 3 and 1 does not change when the throttle valve angle is changed: Replace TPS.

AUTOMATIC TRANSMISSION (4L30-E) 7 A-95
DIAGNOSTIC TROUBLE CODE (DTC) 31
SOLENOID 1-2/3-4 SHORT TO GROUND OR OPEN
• Ignition switch OFF. • Disconnect Transmission Control Module (TCM) connector C-90 and C-91.
•
Connect ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A2. IF: Display between 17.5 and 18.5 ohms?
• Connect ohmmeter between connector C-90 terminal A2 and connector C-91 terminal C1 (TCM ground).
IF: Short circuit:
• Check for faulty connector or wiring between terminal A2
and ground.
• Repair.
The
problem is intermittent. GOTO INTERMITTENT CONDmONS.
Check for an open circuit between connector C-90 terminal A2 and connector C-91 terminal C12.
IF: Wiring problem?
I Repair.
• Disconnect 1-2/3-4 solenoid connector. • IF: Ohmmeter displays between 17.5 and 18.5
ohms on the 1-2/3-4
solenoid terminals:
The problems is
intermittent. GOTO INTERMITTENT
CONDITIONS.

AUTOMATIC TRANSMISSION (4L30-E) 7 A-97
DIAGNOSTIC TROUBLE CODE (DTC) 32
SOLENOID 2-3 SHORT TO GROUND OR OPEN
• Ignition switch OFF. • Disconnect Transmission Control Module
(TCM) connector C-90 and C-91.
• Connect
ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A3. IF: Display between 17.5 and 18.5 ohms?
• Connect ohmmeter between connector C-90 terminal A3 and connector C-91 terminal C1 (TCM ground).
IF: Short circuit:
• Check for faulty connector or wiring between terminal A3
and ground.
Repair.
The
problem is intermittent. GOTO INTERMITTENT
CONDITIONS.
Check for an open circuit between connector C-90 terminal A3 and connector C-91 terminal C1.
IF: Wiring problem?
•
Disconnect 2-3 solenoid connector. IF: Ohmmeter displays between 17.5 and 18.5 ohms on the 2-3 solenoid terminals:
The problems is
intermittent. GOTO INTERMITTENT
CONDITIONS.

AUTOMATIC TRANSMISSION (4L30-E) 7 A-103
DIAGNOSTIC TROUBLE CODE (DTC) 34
BAND APPLY SOLENOID SHORT TO GROUND OR OPEN
• Ignition switch off. • Disconnect Transmission Control Module (TCM) connector C-90 and C-91
• Connect ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A9. IF: Display is approx. 10 ohms:
• Connect ohmmeter between connector C-90 terminal A9 and connector C-91 terminal C1 (TCM ground)
IF: Short circuit:
• Check for faulty connector or wiring
between terminal A9
and ground.
• Repair.
The
problem is intermittent.
GOTO INTERMITTENT
CONDITIONS.
• Check for an open circuit between
connector C-90 terminal A9 and
connector
C-91 terminal C12. IF: Wiring problem?
•
Disconnect band apply solenoid connector. IF: Ohmmeter displays approx. 10
ohms on the band apply solenoid terminals:
The
problem is intermittent.
GOTO INTERMmENT CONDITIONS.

AUTOMATIC TRANSMISSION (4l30-E) 7A-105
DIAGNOSTIC
TROUBLE CODE (DTC) 35
FORCE MOTOR OPEN OR SHORT TO PLUS OR GROUND
• Ignition switch off.
• Disconnect Transmission Control Module (TCM) connector C-90 and C-91
• Connect ohmmeter between connector C-91 terminals C15 and C16. IF: Display is between 3.7 and 4.7 ohms:
• Connect ohmmeter between connector C-91 terminals C15 and C1 {TCM ground) then between
terminal C15 and connecter C-90 terminal A7 (TCM ignition) then between terminals C16 and C1 (TCM ground) then between terminals C16 and A7 (TCM ignition).
IF: Display indicates a short circuit:
The
problem is
intermittent. GOTO INTERMITIENT
CONDITIONS.
• Disconnect automatic transmission adapter case
connector M-6.
• Connect ohmmeter between terminals 2(8) and 1(E)
of female half of the connector (solenoid side). IF: Display between 3.7 and 4.7 ohms:
Repair wires
for open between terminals C15 or C16 and adapter
case connector M-6.
• Disconnect solenoid connector. • Connect ohmmeter between solenoid
terminals.
IF: Display between 3.7 and 4.7 ohms:
Repair wires
for open
between adapter case
connector and
solenoid connector.
Replace force motor solenoid.

AUTOMATIC TRANSMISSION (4L30-E) 7A-107
DIAGNOSTIC TROUBLE CODE (DTC) 36
SHIFT HIGH SHORT TO GROUND OR OPEN
• Ignition switch off .
• Disconnect Transmission Control Module (TCM)
connectors C-90 and C-91.
• Connect ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A2 and between
C12 and A3 and between C12 and A9. IF: Display is approx. 10 ohms for the band apply and 18 ohms for the other solenoids:
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$ $
• Connect ohmmeter between connector C-91 terminal • Check for an open circuit between connector
C12 and C1 (TCM ground). C-91 terminal C12 and the other terminals A2,
IF: Short circuit: A3
and A9.
I IF: Wiring problem?
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$ 8
$ $ • Check for faulty connector or wiring between terminal C12 I Repair. I The problem is
and ground. intermittent.
• Repair
. GOTO INTERMmENT
CONDITIONS.
I The problem is intermittent. GOTO INTERMITTENT CONDITIONS.