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 DTC P2507 [L8, LF, L3]

DTC P2507 [L8, LF, L3]

id0102a1814300

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).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.

POSSIBLE CAUSE

• Burnt 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 AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR 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 EEC FUSE
• Turn the ignition switch off.
• Inspect EEC fuse for failure and proper.
• Is it normal?
Yes
Go to Step 6.
No
• If EEC fuse has been burnt, 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 for continuity between EEC fuse 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 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 pins, corrosion).
• Is there any malfunction?
Yes
Repair the terminals, then go to Step 7.
No
Go to the next step.
6
INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect battery cables.
• Inspect for 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 the wiring harness for an 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 the DTC from the PCM memory using the WDS or equivalent.
• 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.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Is any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.