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DTC P2507 [L8, LF, L3]

id0102a1814300

DTC P2507 | PCM B+ voltage low
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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
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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. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
8 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.