Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 172
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?
—
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”?
—
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.
3. Operate the vehicle and monitor the “F0: Read
DTC Infor As Stored By ECU” in the “F0:
Diagnostic Trouble Codes”.
Was the DTC P1651 (Symptom Code B) stored in this
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?
—
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?
—
Verify repair
Go to Step 6
6
Visually check the PSG (pump control unit).
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
verify repair
100
99
1
2
C-57
E-6
2
1
E-6
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6E–293
8
Using the DVM and check the CAN high circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as type A. (ECM
disconnected) Ref. Page 6E-73
3. Disconnect the PSG (pump control unit)
connector.
4. Check the circuit for open or short to ground
circuit.
Was the problem found?
Breaker box is not available:
1. Ignition “Off”, engine “Off”.
2. Disconnect the PSG (pump control unit)
connector.
3. Check the circuit for open or short to ground
circuit.
Was the problem found?
—
Repair faulty
harness and
verify repair
Go to Step 9
Step
Action
Value(s)
Yes
No
100
2
E-6
100
2
C-57
E-6
6E–294
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
9
Using the DVM and check the CAN low circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as type A. (ECM
disconnected) Ref. Page 6E-73
3. Disconnect the PSG (pump control unit)
connector.
4. Check the circuit for open or short to ground
circuit.
Was the problem found?
Breaker box is not available:
1. Ignition “Off”, engine “Off”.
2. Disconnect the PSG (pump control unit)
connector.
3. Check the circuit for open or short to ground
circuit.
Was the problem found?
—
Repair faulty
harness and
verify repair
Go to Step 10
10
Using the DVM and check the CAN high circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the PSG (pump control unit)
connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated battery voltage or
approximately 5V?
—
Go to Step 11
Go to Step 12
Step
Action
Value(s)
Yes
No
99
1
E-6
99
1
C-57
E-6
2
V
E-6
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6E–295
11
Repair the short to voltage circuit between the ECM
and PSG (pump control unit).
Is the action complete?
—
Verify repair
—
12
Using the DVM and check the CAN low circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the PSG (pump control unit)
connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated battery voltage or
approximately 5V?
—
Go to Step 13
Go to Step 14
13
Repair the short to voltage circuit between the ECM
and PSG (pump control unit).
Is the action complete?
—
Verify repair
—
14
Using the DVM and check the PSG (pump control
unit) ground circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the PSG (pump control unit)
connector.
3. Check the circuit for open circuit.
Was the problem found?
—
Repair faulty
harness and
verify repair
Go to Step 15
Step
Action
Value(s)
Yes
No
100
2
C-57
E-6
1
V
E-6
99
1
C-57
E-6
6
E-6
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