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4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Always check and recheck your work. No service operation is complete until you have done this. NOTES ON THE FORMAT OF THIS MANUAL This Workshop Manual is applicable to ISUZU industrial engine or engines which is or are stated in the title. Page 6 GENERAL INFORMATION 4. When the same servicing operation is applicable to several different. Isuzu 4J engine specs, bolt torques, workshop manual. Basic specs are free and open to everyone They usually include engine images, displacement, dimensions and weight, essential bolt tightening torques, plus characteristics of the engine e.g. Its power and torque.
Diagnostic Trouble Code (DTC) P1651 (Symptom Code B) (Flash Code 45) CAN
Receives Error
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
performed?
--
Go to Step 2
Go to On Board
Diagnostic
(OBD) System
Check
2
1. Connect the Tech 2.
2. Review and record the failure information.
3. Select “F0: Read DTC Infor As Stored By ECU” in
“F0: Diagnostic Trouble Codes”.
Is the DTC P1651 (Symptom Code B) stored as
“Present Failure”?
“Present Failure”?
--
Go to Step 3
Refer to
Diagnostic Aids
and Go to Step
3
3
1. Using the Tech 2, ignition “On” and engine “Off”.
2. Select “F1: Clear DTC Information” in “F0:
Diagnostic Trouble Codes” with the Tech 2 and
clear the DTC information.
clear the DTC information.
3. Operate the vehicle and monitor the “F0: Read
DTC Infor As Stored By ECU” in the “F0:
Diagnostic Trouble Codes”.
Diagnostic Trouble Codes”.
Was the DTC P1651 (Symptom Code B) stored in this
ignition cycle?
ignition cycle?
--
Go to Step 4
![Service Service](https://vjlcoaching.com/images/712187.jpg)
Refer to
Diagnostic Aids
and Go to Step
4
4
Was the DTC P1650 (Symptom Code A) stored at the
same time?
same time?
--
Go to DTC
Chart P1650
(Symptom
Code A)
Go to Step 5
5
Check for poor/faulty connection at the ECM or PSG
(pump control unit) connector. If a poor/faulty
connection is found, repair as necessary.
Was the problem found?
(pump control unit) connector. If a poor/faulty
connection is found, repair as necessary.
Was the problem found?
--
Verify repair
Go to Step 6
6
Visually check the PSG (pump control unit).
Was the problem found?
Was the problem found?
--
Go to Step 19
Go to Step 7
7
Using the DVM and check the CAN high circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the ECM connector and PSG (pump
control unit) connector.
3. Check the circuit for short to CAN low circuit.
Was the DVM indicated specified value?
No continuity
Go to Step 8
Repair faulty
harness and
harness and
verify repair
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Content .. 170171172173 ..
6E–292
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1651 (Symptom Code B) (Flash Code 45) CAN
Receives Error
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
performed?
--
Go to Step 2
Go to On Board
Diagnostic
(OBD) System
Check
2
1. Connect the Tech 2.
2. Review and record the failure information.
3. Select “F0: Read DTC Infor As Stored By ECU” in
“F0: Diagnostic Trouble Codes”.
Is the DTC P1651 (Symptom Code B) stored as
“Present Failure”?
“Present Failure”?
--
Go to Step 3
Refer to
Diagnostic Aids
and Go to Step
3
3
1. Using the Tech 2, ignition “On” and engine “Off”.
2. Select “F1: Clear DTC Information” in “F0:
Diagnostic Trouble Codes” with the Tech 2 and
clear the DTC information.
clear the DTC information.
3. Operate the vehicle and monitor the “F0: Read
DTC Infor As Stored By ECU” in the “F0:
Diagnostic Trouble Codes”.
Diagnostic Trouble Codes”.
Was the DTC P1651 (Symptom Code B) stored in this
ignition cycle?
ignition cycle?
--
Go to Step 4
Refer to
Diagnostic Aids
and Go to Step
4
4
Was the DTC P1650 (Symptom Code A) stored at the
same time?
same time?
--
Go to DTC
Chart P1650
(Symptom
Code A)
Go to Step 5
5
Check for poor/faulty connection at the ECM or PSG
(pump control unit) connector. If a poor/faulty
connection is found, repair as necessary.
Was the problem found?
(pump control unit) connector. If a poor/faulty
connection is found, repair as necessary.
Was the problem found?
--
Verify repair
Go to Step 6
6
Visually check the PSG (pump control unit).
Was the problem found?
Was the problem found?
--
Go to Step 19
Go to Step 7
7
Using the DVM and check the CAN high circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the ECM connector and PSG (pump
control unit) connector.
3. Check the circuit for short to CAN low circuit.
Was the DVM indicated specified value?
No continuity
Go to Step 8
Repair faulty
harness and
harness and
verify repair
Isuzu 4jh1 Service Manual Download
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