DTC P2507 [LF]

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DTC P2507 [LF]

B3E010201083W06

DTC P2507 | PCM B+ voltage low
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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
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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.
(See PCM REMOVAL/INSTALLATION [LF].)

No | Go to the next step.
8 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [LF].) • Are any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [LF].)
No | Troubleshooting completed.