1998 ISUZU TROOPER Service Repair Manual

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Page 1329 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±212
ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0353 Ignition 3 Control Circuit
D06RW072
Circuit Description
The powertrain control modules (PCM) control circuit 3
provides a

Page 1330 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±213 ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM ± Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and

6E±213 ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM ± Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and poor terminal-to-wire connections.
Damaged harness ± Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Tech 2 display related to DTC P0353 while moving theconnector and wiring related to the ignition system. A
change in the display will indicate the location of the
fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0353 ± Ignition 3 Control Circuit
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªON,º engine ªOFF.º
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Record
conditions as noted.
4. Use a Tech 2 to monitor the ªSpecific DTCº
information for DTC P0353 until the DTC P0353 test
runs.
5. Note the test result.
Does the Tech 2 indicate DTC P0353 failed this ignition
cycle?
ÐGo to Step 3
Go to
Diagnostic
Aids
3Check for faulty connection at ignition coil.
Was a problem found?
ÐVerify repairGo to Step 4
4Check for faulty connection at PCM connector.
Was a problem found?
ÐVerify repairGo to Step 5
51. Ignition ªON,º engine ªOFF.º
2. Back probe the ignition control circuit 3 at the PCM
with a DVM positive lead with the negative lead to
ground.
Is the voltage near the specified value?
25-55 mVGo to Step 6Go to Step 9
61. Ignition ªON,º engine running.
2. Back probe the ignition control circuit at the PCM for
the cylinder being tested.
Is the voltage in the specified range, rapidly toggling
back and forth to a reading 20-50 mV higher?
100-180 mVGo to Step 7Go to Step 13
71. Ignition ªOFF.º
2. Disconnect the 3-pin and 5-pin connectors at the
ignition coil.
3. Check ignition control circuit 3 voltage at the ignition
coil connector while cranking the engine.
Does the voltage measure between the specified
values?
200-1200 mVGo to Step 8Go to Step 11
8Replace the ignition coil.
Is the action complete?
ÐVerify repairÐ
91. Ignition ªOFF.º
2. Disconnect the PCM and the ignition coil.
3. Check ignition control circuit 3 for short to ground.
Was a problem found?
ÐVerify repairGo to Step 10
10Check ignition control circuit 3 for short to voltage.
Was a problem found?
ÐVerify repairGo to Step 13

Page 1331 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±214
ENGINE DRIVEABILITY AND EMISSIONS
DTC P0353 ± Ignition 3 Control Circuit
StepNo Ye s Value(s) Action
11Check for an open ignition control circuit 1.
Was the ignition control circuit

Page 1332 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±215 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0354 Ignition 4 Control Circuit
D06RW072
Circuit Description
The powertrain control modules (PCM) control circuit 4
provides a

Page 1333 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±216
ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM ± Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and

6E±216
ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM ± Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and poor terminal-to-wire connections.
Damaged harness ± Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Tech 2 display related to DTC P0354 while moving theconnector and wiring related to the ignition system. A
change in the display will indicate the location of the
fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0354 ± Ignition 4 Control Circuit
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªON,º engine ªOFF.º
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Record
conditions as noted.
4. Use a Tech 2 to monitor the ªSpecific DTCº
information for DTC P0354 until the DTC P0354 test
runs.
5. Note the test result.
Does the Tech 2 indicate DTC P0354 failed this ignition
cycle?
ÐGo to Step 3
Go to
Diagnostic
Aids
3Check for faulty connection at ignition coil.
Was a problem found?
ÐVerify repairGo to Step 4
4Check for faulty connection at PCM connector.
Was a problem found?
ÐVerify repairGo to Step 5
51. Ignition ªON,º engine ªOFF.º
2. Back probe the ignition control circuit 4 at the PCM
with a DVM positive lead with the negative lead to
ground.
Is the voltage near the specified value?
25-55 mVGo to Step 6Go to Step 9
61. Ignition ªON,º engine running.
2. Back probe the ignition control circuit at the PCM for
the cylinder being tested.
Is the voltage in the specified range, rapidly toggling
back and forth to a reading 20-50 mV higher?
100-180 mVGo to Step 7Go to Step 13
71. Ignition ªOFF.º
2. Disconnect the 3-pin and 5-pin connectors at the
ignition coil.
3. Check ignition control circuit 4 voltage at the ignition
coil connector while cranking the engine.
Does the voltage measure between the specified
values?
200-1200 mVGo to Step 8Go to Step 11
8Replace the ignition coil.
Is the action complete?
ÐVerify repairÐ
91. Ignition ªOFF.º
2. Disconnect the PCM and the ignition coil.
3. Check ignition control circuit 4 for short to ground.
Was a problem found?
ÐVerify repairGo to Step 10
10Check ignition control circuit 4 for short to voltage.
Was a problem found?
ÐVerify repairGo to Step 13

Page 1334 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±217 ENGINE DRIVEABILITY AND EMISSIONS
DTC P0354 ± Ignition 4 Control Circuit
StepNo Ye s Value(s) Action
11Check for an open ignition control circuit 1.
Was the ignition control circuit

Page 1335 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±218
ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0355 Ignition 5 Control Circuit
D06RW072
Circuit Description
The powertrain control modules (PCM) control circuit 5
provides a

Page 1336 of 3573

ISUZU TROOPER 1998 Service Repair Manual 6E±219 ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM ± Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and

6E±219 ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM ± Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and poor terminal-to-wire connections.
Damaged harness ± Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Tech 2 display related to DTC P0355 while moving theconnector and wiring related to the ignition system. A
change in the display will indicate the location of the
fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0355 ± Ignition 5 Control Circuit
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªON,º engine ªOFF.º
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Record
conditions as noted.
4. Use a Tech 2 to monitor the ªSpecific DTCº
information for DTC P0355 until the DTC P0355 test
runs.
5. Note the test result.
Does the Tech 2 indicate DTC P0355 failed this ignition
cycle?
ÐGo to Step 3
Go to
Diagnostic
Aids
3Check for faulty connection at ignition coil.
Was a problem found?
ÐVerify repairGo to Step 4
4Check for faulty connection at PCM connector.
Was a problem found?
ÐVerify repairGo to Step 5
51. Ignition ªON,º engine ªOFF.º
2. Back probe the ignition control circuit 5 at the PCM
with a DVM positive lead with the negative lead to
ground.
Is the voltage near the specified value?
25-55 mVGo to Step 6Go to Step 9
61. Ignition ªON,º engine running.
2. Back probe the ignition control circuit at the PCM for
the cylinder being tested.
Is the voltage in the specified range, rapidly toggling
back and forth to a reading 20-50 mV higher?
100-180 mVGo to Step 7Go to Step 13
71. Ignition ªOFF.º
2. Disconnect the 3-pin and 5-pin connectors at the
ignition coil.
3. Check ignition control circuit 5 voltage at the ignition
coil connector while cranking the engine.
Does the voltage measure between the specified
values?
200-1200 mVGo to Step 8Go to Step 11
8Replace the ignition coil.
Is the action complete?
ÐVerify repairÐ
91. Ignition ªOFF.º
2. Disconnect the PCM and the ignition coil.
3. Check ignition control circuit 5 for short to ground.
Was a problem found?
ÐVerify repairGo to Step 10
10Check ignition control circuit 5 for short to voltage.
Was a problem found?
ÐVerify repairGo to Step 13

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