DTC P2507 [L8, LF]

id0102b1814300

DTC P2507

PCM B+ voltage low

DETECTION CONDITION

• The PCM monitors the voltage of back-up battery positive terminal. 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.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Open circuit in wiring between battery positive terminal and PCM terminal 1BA
• Short to ground in wiring harness between battery positive terminal and PCM terminal 1BA
• Poor connection of PCM connector
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Have FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT MONITOR CIRCUIT FOR SHORT TO GROUND
• Disconnect battery cables.
• Inspect for continuity between battery positive terminal wiring harness-side 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 the next step.
4
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Disconnect PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, 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 battery cables.
• Inspect for continuity between battery positive terminal wiring harness-side and PCM terminal 1BA (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an 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 M-MDS.
• Start the engine and warm it up completely.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Is any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.