DTC P2507 [L3 R.H.D.]

id0102a2814300

DTC P2507

PCM B+ voltage low

DETECTION CONDITION

• The PCM monitors the voltage of back-up battery positive terminal at PCM terminal 78. If the PCM detects battery positive terminal voltage below 2.5 V for 2 s, the PCM determines that the backup voltage circuit has a malfunction.

POSSIBLE CAUSE

• Open circuit in wiring harness between battery positive terminal and PCM terminal 78
• Short to ground between battery positive terminal and PCM terminal 78
• Poor connection of PCM connector
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME PID DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME PID DATA on repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related service repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available repair information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT MONITOR CIRCUIT FOR SHORT TO GROUND
• Disconnect the battery cables.
• Inspect for continuity between the battery positive terminal and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground and install new fuse, then go to Step 6.
No
Go to step 6.
4
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Disconnect 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 6.
No
Go to the next step.
5
INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect the battery cables.
• Inspect for continuity between the battery positive terminal and PCM terminal 78 (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P2507 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch to the ON position (engine off).
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Start engine and warm it up completely.
• Is the same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.