DTC P2507 [LF, L3]

id0102a3814300

DTC P2507

PCM B+ voltage low

DETECTION CONDITION

• The PCM monitors the voltage of back-up battery positive terminal at PCM terminal 1BA. If the PCM detected battery positive terminal voltage below 2.5 V for 2 s, the PCM determines that the backup voltage circuit has malfunction.

POSSIBLE CAUSE

• Melt down EEC fuse
• Open circuit in wiring between EEC fuse and PCM terminal 1BA
• Short to ground between EEC fuse and PCM terminal 1BA
• 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 EEC FUSE
• Turn the ignition switch to off.
• Inspect EEC fuse for failure and proper.
• Is it normal?
Yes
Go to step 6.
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.
• Inspect continuity between EEC fuse terminal and body ground.
• Is there continuity?
Yes
Repair or replace wiring harness for short to ground and install new fuse, then go to Step 7.
No
Go to step 7.
5
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 terminals, then go to Step 7.
No
Go to the next step.
6
INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect battery cables.
• Inspect continuity between EEC fuse terminal and PCM terminal 1BA (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace wiring harness for open circuit, then go to the next step.
7
VERIFY TROUBLESHOOTING OF DTC P2507 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch to the ON position (Engine off).
• Clear DTC from PCM memory using WDS or equivalent.
• Start engine and warm it up completely.
• Is same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Are any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.