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DTC P1631 [AJ]

BME010201600208

DTC P1631 | Generator output voltage signal no electricity
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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
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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". (See AFTER REPAIR PROCEDURE [AJ].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
No | Troubleshooting completed.