DTC P2507 [AJ]

BME010202500W03

DTC P2507

PCM +BB (back-up battery) voltage low

DETECTION CONDITION

• The PCM monitors the voltage of back-up battery positive terminal at PCM terminal 86. If the PCM detected battery positive terminal voltage below 2.5 V for 2 seconds, the PCM determines that the backup voltage circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Burnt EEC fuse.
• Open circuit in wiring between battery positive terminal and PCM terminal 86
• Short to ground in wiring between battery positive terminal and PCM terminal 86
• Poor connection of PCM connector.
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Information and/or on-line repair information availability.
• Is any repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT EEC FUSE
• Turn the ignition switch off.
• Inspect EEC fuse for failure and proper.
• Is it normal?
Yes
Go to step 5.
No
• If EEC fuse has been melt down, then go to the next step.
• If EEC fuse is not installed correctly, install it correctly then go to Step 7.
4
INSPECT MONITOR CIRCUIT FOR SHORT TO GROUND
• Disconnect battery cables.
• Check continuity between EEC fuse terminal and body ground.
• Is there continuity?
Yes
Repair or replace harness for short to ground and install new fuse, then go to Step 7.
No
Go to step 7.
5
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminals, then go to Step 7.
No
Go to the next step.
6
INSPECT MONITOR CIRCUIT FOR OPEN
• Disconnect battery cables.
• Connect the PCM connector.
• Check continuity between EEC fuse terminal and PCM terminal 86.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace harness for open, then go to the next step.
7
VERIFY TROUBLESHOOTING OF DTC P2507 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch off then engine start.
• Is same DTC's pending cord present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.