display ISUZU TROOPER 1998 Service Repair Manual
[x] Cancel search | Manufacturer: ISUZU, Model Year: 1998, Model line: TROOPER, Model: ISUZU TROOPER 1998Pages: 3573, PDF Size: 60.36 MB
Page 2305 of 3573
7A1±60
TRANSMISSION CONTROL SYSTEM (4L30±E)
When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
Test Description
The numbers below refer to the step numbers on the
diagnostic char:
5. This test measures the resistance of the component.
7. This test checks the function of the shift solenoid B
and the transmission internal wiring harness.
11.This test checks for power to the shift solenoid B
from the ignition through the PCM.Shift Solenoid Status Chart
Gear
Shift solenoid AShift solenoid B
1stOFFON
2ndONON
3rdONOFF
4thOFFOFF
DTC P0758 Shift Solenoid B Electrical
StepActionYe sNo
11. Install the scan tool.
2. With the engine ªonº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when the ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Were DTCs P0753, P0758, P1860 set?
Go to Step 3Go to Step 2
21. The engine ªonº.
2. Apply brake pedal and select transmission range ªDº.
3. Press and hold down the winter switch and select transmission
mode ªwinterº.
Does the scan tool display DTC P0758 at 3rd gear?
Go to Step 7
Go to Diagnostic
Aids
31. Turn the ignition ªoffº.
2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.
3. Turn the ignition ªonº.
4. Using the J39200 DVOM, measure the voltage between PCM
connector terminals J2±C2 and J2±C8.
Is the voltage within 10 ± 12 volts?
Go to Step 14Go to Step 4
41. Turn the ignition ªoffº.
2. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J2±C2 and J3±E14.
Is the resistance within 18 ± 20 ohms?
Go to Step 15Go to Step 5
51. Disconnect the transmission 16±way connector H±53.
2. Using the J39200 DVOM, measure the resistance between
terminals H53±16 and H53±15.
Is the resistance within 18 ± 20 ohms?
Go to Step 16Go to Step 6
61. Disconnect the transmission main case connector M±7.
2. Using the J39200 DVOM, measure the resistance between
terminals M7±1(A) and M7±4(C).
Is the resistance within 18 ± 20 ohms?
Go to Step 17Go to Step 18
71. Turn the ignition ªoffº.
2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J2±C2 and J3±E14.
Is the resistance within 18 ± 20 ohms?
Go to Step 8Go to Step 9
8Using the J39200 DVOM, check a continuity between PCM
connector terminal J2±C2 and ground.
Is there a continuity?
Go to Step 19Go to Step 10
Page 2306 of 3573
TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±61
DTC P0758 Shift Solenoid B Electrical (Cont'd)
StepNo Ye s Action
91. Disconnect the transmission 16±way connector H±53.
2. Using the J39200 DVOM, measure the resistance between
terminals H53±16 and H53±15.
Is the resistance within 18±20 ohms?
Go to Step 20Go to Step 11
10Using the J39200 DVOM, check a continuity between PCM
connector terminal J3±E14 and ground.
Is there a continuity?
Go to Step 21Go to Step 12
111. Disconnect the transmission main case connector M±7.
2. Using the J39200 DVOM, measure the resistance between
terminals M7±1(A) and M7±4(C).
Is the resistance within 18 ± 20 ohms?
Go to Step 22Go to Step 23
12Check every connection of the PCM and transmission 16±way
connector H±53.
Was a problem found and corrected?
Go to Step 25Go to Step 13
131. Connect the J2 (WHITE) and J3 (BLUE) PCM connectors to
the PCM.
2. Turn the ignition ªonº, the engine ªonº.
3. Repeat Step 3.
Does the scan tool display DTC P0758 at 3rd gear?
Go to Step 24
Go to Diagnostic
Aids
14The wiring harness between PCM connector terminal
J2±C2 and transmission main case terminal M7±1(A) is shorted
to voltage.
Was a problem found and corrected?
Go to Step 25Ð
15The PCM internal terminal J2±C2 is shorted to voltage.
Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30±E) section.
Is the replacement complete?
Go to Step 25Ð
16The wiring harness between PCM connector and transmission
16±way connector is shorted.
Was a problem found and corrected?
Go to Step 25Ð
17The wiring harness between transmission 16±way connector and
transmission main case connector is shorted.
Was a problem found and corrected?
Go to Step 25Ð
18The shift solenoid B is faulty, or the internal wiring harness from
the shift solenoid B is shorted.
Was a problem found and corrected?
Go to Step 25Ð
19The wiring harness between PCM connector terminal
J2±C2 and transmission main case connector terminal M7±1(A)
is shorted to ground.
Was a problem found and corrected?
Go to Step 25Ð
20The wiring harness between PCM connector terminal J2±C2 and
transmission 16±way connector terminal H53±16, or between
PCM connector terminal J3±E14 and 16±way connector terminal
H53±15 is open.
Was a problem found and corrected?
Go to Step 25Ð
Page 2307 of 3573
7A1±62
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0758 Shift Solenoid B Electrical (Cont'd)
StepNo Ye s Action
21The wiring harness between PCM connector terminal J3±E14
and transmission main case connector terminal M7±4(C) is
shorted to ground.
Was a problem found and corrected?
Go to Step 25Ð
22The wiring harness between transmission 16±way connector
terminal H53±16 and transmission main case connector terminal
M7±1(A), or between H53±15 and M7±4(C) is open.
Was a problem found and corrected?
Go to Step 25Ð
23The internal wiring harness from the shift solenoid B is open, or
the shift solenoid B is faulty.
Was a problem found and corrected?
Go to Step 25Ð
24Replace the PCM.
Is the replacement complete?
Go to Step 25Ð
251. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and operate the vehicle under the
following conditions:
The shift solenoid B is commanded ªonº and voltage drop to
zero.
The shift solenoid B is commanded ªoffº and voltage
increases to B+.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table
Page 2308 of 3573
TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±63
DTC P1790 ROM Transmission Side
Bad Check Sum
Circuit Description
Transmission Side Read Only Memory (ROM) and
Electronically Erasable Programmable Read Only
Memory (EEPROM) is an electronic circuit that controls
the transmission control in the Powertrain Control Module
(PCM).
This DTC detects a check sum error. This is a type ªCº
DTC.
Conditions For Setting The DTC
Detects check sum error for 1 second.
Action Taken When The DTC Sets
Maximum line pressure.Immediate landing to 4th gear.
Inhibit TCC engagement.
The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC
The PCM will turn off the CHECK TRANS Lamp after
three consecutive ignition cycles without a failure
reported.
The DTC can be cleared from the PCM history by
using a scan tool.
The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.
The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
DTC P1790 ROM Transmission Side Bad Check Sum
StepActionYe sNo
11. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when the ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Was DTC P1790 set?
Go to Step 4Go to Step 2
2Was DTC P1792 set?Go to Step 3Ð
31. Remove the PCM. Refer to Powertrain Control Module (PCM)
in Automatic Transmission (4L30±E) section.
2. Using the ITCS, make a reprogramming the transmission
EEPROM.
Was the reprogramming complete?
Go to Step 5Ð
4Replace the PCM.
Is the replacement complete?
Go to Step 5Ð
51. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and operate the vehicle.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table
Page 2309 of 3573
7A1±64
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1792 EEPROM Transmission
Side Bad Check Sum
Circuit Description
Transmission Side Read Only Memory (ROM) and
Electronically Erasable Programmable Read Only
Memory (EEPROM) is an electronic circuit that controls
the transmission control in the Powertrain Control Module
(PCM).
This DTC detects a check sum error. This is a type ªCº
DTC.
Conditions For Setting The DTC
Detects check sum error for 1 second.
Action Taken When The DTC Sets
Maximum line pressure.Immediate landing to 4th gear.
Inhibit TCC engagement.
The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC
The PCM will turn off the CHECK TRANS Lamp after
three consecutive ignition cycles without a failure
reported.
The DTC can be cleared from the PCM history by
using a scan tool.
The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.
The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
DTC P1792 EEPROM Transmission Side Check Bad Check Sum
StepActionYe sNo
11. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when the ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Was DTC P1790 set?
Go to Step 4Go to Step 2
2Was DTC P1792 set?Go to Step 3Ð
31. Remove the PCM. Refer to Powertrain Control Module (PCM)
in Automatic Transmission (4L30±E) section.
2. Using the ITCS, make a reprogramming the transmission
EEPROM.
Was the reprogramming complete?
Go to Step 5Ð
4Replace the PCM.
Is the replacement complete?
Go to Step 5Ð
51. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and operate the vehicle.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table
Page 2311 of 3573
7A1±66
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1835 Kickdown Switch Always On
StepActionYe sNo
11. Install the scan tool.
2. With the engine ªonº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when the ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Does the scan tool display ªKickdown switchº ªlowº (closed
switch)?
Go to Step 2Go to Step 3
21. Turn the ignition ªoffº.
2. Disconnect the J3 (BLUE) PCM connector.
3. Using the J39200 DVOM, check a continuity between PCM
connector terminal J3±F11 and ground.
Is there a continuity?
Go to Step 4Go to Step 7
3The TP angle goes from 0% to 100% with the accelerator pedal
depressed.
Is the kickdown switch ªonº when TP angle is below 70%?
Go to Step 5
Go to Diagnostic
Aids
41. Disconnect the kickdown switch connector B±10.
2. Using the J39200 DVOM, check a continuity between
terminals B10±1 and B10±2.
Is there a continuity?
Go to Step 6Go to Step 8
5Adjust the kickdown switch.
Is the kickdown switch ªonº when TP angle is above 95%?
Go to Step 9Ð
6Replace the kickdown switch.
Is the replacement complete?
Go to Step 9Ð
7Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30±E) section.
Is the replacement complete?
Go to Step 9Ð
8Repair the short to ground in circuit LT BLUE.
Is the repair complete?
Go to Step 9Ð
91. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following condition is
met:
The torque converter stator temperature switch circuit does not
indicate a hot mode when the transmission fluid temperature is
less than 60C (140F) for at least 5 seconds.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table
Page 2315 of 3573
7A1±70
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1850 Brake Band Apply Solenoid Malfunction (Cont'd)
StepNo Ye s Action
23The wiring harness between the PCM connector terminal J1±A16
and the 16±way connector terminal H53±13 is open.
Was a problem found and corrected?
Go to Step 26Ð
24The wiring harness between the transmission 16±way connector
terminal H53±13 and the transmission main case connector
terminal M7±2(B) is open.
Was a problem found and corrected?
Go to Step 26Ð
25Check every connection at the PCM.
If OK, replace the PCM. Refer to Powertrain Control Module
(PCM) in Automatic Transmission (4L30±E) section.
Is the replacement complete?
Go to Step 26Ð
261. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following conditions
are met:
The brake band apply solenoid is commanded ªonº and the
volts drop to zero.
The brake band apply solenoid is commanded ªoffº and the
volts increase to B+.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table
Page 2317 of 3573
7A1±72
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1860 TCC Solenoid Electrical
StepActionYe sNo
11. Install the scan tool.
2. With the engine ªonº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when theªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Go to Step 2Go to Step 3
2Using the J39200 DVOM, back probe between PCM connector
terminals J2±D2 and J2±C8.
Is the voltage 0 ?
Go to Step 4Go to Step 5
31. Apply brake pedal and select transmission range ªDº.
2. Do a test drive, and increase the vehicle speed to TCC ªonº at
4th.
Does the scan tool display DTC P1860 at TCC ªONº?
Go to Step 9
Go to Diagnostic
Aids
41. Turn the ignition ªoffº.
2. Disconnect the J2 (WHITE) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J2±D2 and J2±C8.
Is the resistance within 18 ± 20 ohms?
Go to Step 6Go to Step 7
5The wiring harness between PCM connector terminal J2±D2 and
transmission adapter case connector terminal M6±4(A) is shorted
to voltage.
Was a problem found and corrected?
Go to Step 18Go to Step 19
6Intermittent condition.
Check the wiring harness and terminals between PCM connector
J2 and transmission adapter case connector M±6.
Was a problem found and corrected?
Go to Step 18Go to Step 19
71. Disconnect the transmission 16±way connector H±53.
2. Using the J39200 DVOM, measure the resistance between
terminal H53±8 and ground.
Is the resistance within 18 ± 20 ohms?
Go to Step 15Go to Step 8
81. Disconnect the transmission adapter case connector M±6.
2. Using the J39200 DVOM, measure the resistance between
terminal M6±4(A) and ground.
Is the resistance within 18 ± 20 ohms?
Go to Step 16Go to Step 17
91. Turn the ignition ªoffº.
2. Disconnect the J2 (WHITE) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
terminals J2±D2 and J2±C8.
Is the resistance within 18 ± 20 ohms?
Go to Step 18Go to Step 10
101. Disconnect the transmission 16±way connector H±53.
2. Using the J39200 DVOM, measure the resistance between
terminal H53±8 and ground.
Is the resistance within 18±20 ohms?
Go to Step 12Go to Step 11
111. Disconnect the transmission adapter case connector M±6.
2. Using the J39200 DVOM, measure the resistance between
terminal M6±4(A) and ground.
Is the resistance within 18±20 ohms?
Go to Step 13Go to Step 14
Page 2318 of 3573
TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±73
DTC P1860 TCC Solenoid Electrical (Cont'd)
StepNo Ye s Action
12The wiring harness between PCM connector terminal J2±D2 and
transmission 16±way connector terminal H53±8 is shorted to
ground.
Was a problem found and corrected?
Go to Step 20Ð
13The wiring harness between transmission 16±way connector
H±53 and adapter case connector M±6 is shorted to ground.
Was a problem found and corrected?
Go to Step 20Ð
14The TCC solenoid is faulty, or the internal wiring harness from the
TCC solenoid is shorted to ground.
Was a problem found and corrected?
Go to Step 20Ð
15The wiring harness between PCM connector terminal J2±D2 and
transmission 16±way connector terminal H53±8 is open.
Was a problem found and corrected?
Go to Step 20Ð
16The wiring harness between transmission 16±way connector
terminal H53±8 and adapter case terminal M6±4(A) is open.
Was a problem found and corrected?
Go to Step 20Ð
17The TCC solenoid is faulty, or the internal wiring harness from the
TCC solenoid is open.
Was a problem found and corrected?
Go to Step 20Ð
18Check every connection at the PCM.
If OK, replace the PCM. Refer to Powertrain Control Module
(PCM) in Automatic Transmission (4L30±E) section.
Is the replacement complete?
Go to Step 20Ð
19Check the PCM connector terminal J2±D2, transmission 16±way
connector terminal H53±8 and transmission adapter case
connector terminal M6±4(A).
Was a problem found and corrected?
Go to Step 20Ð
201. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following conditions
are met:
The TCC solenoid is commanded ªonº and the volts increase
to B+.
The TCC solenoid is commanded ªoffº and the volts drop to
zero.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table
Page 2872 of 3573
WIRING SYSTEM 8DÐ279
Diagnosis
The cruise control unit uses the cruise main indicator light and diagnoses the failure, when the control unit
detects abnormality on the table below.
PART POSIBLE CAUSE DETECTION PERIOD DTC
Motor system short circuit Energizing motor 1Ð1
Clutch system short circuit Energizing clutch 1Ð2
Actuator Clutch system open circuit Energizing clutch 1Ð2
Mechanical defect Cruise controlling 1Ð3
Close side of motor system open circuit Cruise controlling 1Ð1
CruiseOpen side of motor system continuously energizing While starter sw on 1Ð4
control unit
Clutch output abnormality While starter sw on 1Ð4
VehicleSignal of vehicle speed disconnection Cruise controlling 2Ð1
speed sensor
Signal of vehicle speed abnormality Cruise controlling 2Ð1
SwitchTurning on switch at all times While starter sw on 3Ð1
Turning on switch at the same time. While starter sw on 3Ð1
DTC: Diagnostic Trouble Code
DTC Display Condition
1. While starter switch on and vehicle speed is 0 km/h, the DTC output begins in top priority by cancel switch
turn on and off being repeated three times for 2 sec. while cruise main switch pushing on, and stops the
DTC output whether vehicle speed is more than 10 km/h or the resume switch is turned on.
2. The cruise control unit outputs the DTC(s) in order from small figure of the code.
3. The header of display of DTC(s) is assumed 4 sec., and it is 2 sec. between different kind of codes.
4. The DTC(s) are erased with the starter switch turned off.
DTC Display Format
1. When no DTCs are detected. (The unit : sec.)
2. When two or more DTCs are detected. (The unit ; sec.)
0.25 0.25
Code 1–1 Code 2–2 410.5
11 1 1 1 1 12