DTC P1631 [AJ]

BME010201600208

DTC P1631

Generator output voltage signal no electricity

DETECTION CONDITION

• The PCM monitors the input voltage from the generator. If the PCM detected that the generator output voltage below 8.5 V for 5 s while engine running, the PCM determines that the charging system has malfunction.

POSSIBLE CAUSE

• Open or short to ground circuit between the generator terminal P and the PCM terminal 30
• Open or short to ground circuit between the generator terminal D and the PCM terminal 53
• Cut drive belt off or came drive belt off
• Generator malfunction
- Rectifier circuit malfunction
- Brush abrasion
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
2
INSPECT DRIVE BELT CONDITION
• Verify that drive belt auto tensioner indicator mark in not exceeding limit.
• Is front drive belt normal?
Yes
Go to the next step.
No
Replace and/or adjust drive belt, then go to Step 9.
3
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out terminals, corrosion).
• Is there any malfunction?
Yes
Repair the terminals, then go to Step 9.
No
Go to the next step.
4
INSPECT GENERATOR CONNECTOR FOR POOR CONNECTION
• Disconnect generator connector.
• Inspect for poor connection (such as damaged/pulled-out terminals, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminals, then go to Step 9.
No
Go to the next step.
5
INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between generator terminal D (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground, then go to Step 9.
No
Go to the next step.
6
INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between generator terminal P (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground, then go to Step 9.
No
Go to the next step.
7
INSPECT GENERATOR CONTROL CIRCUIT FOR OPEN CIRCUIT
• Disconnect the PCM connector.
• Measure the resistance between generator terminal D (wiring harness-side) and PCM terminal 53.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to Step 9.
8
INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT FOR OPEN CIRCUIT
• Measure the resistance between generator terminal P (wiring harness-side) and PCM terminal 30.
• Is there continuity?
Yes
Repair or replace the generator, then go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P1631 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Turn the ignition switch off, then start the engine.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.