DTC P2507 [ZJ, Z6]

B3E010202500W04

DTC P2507

PCM power input signal low

DETECTION CONDITION

• The PCM monitors the voltage of the backup battery positive at PCM terminal 1AX. If the PCM detects that the battery positive terminal voltage is 2.5 V or less for 2 s, the PCM determines that the backup voltage circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if PCM detects the above malfunction condition during the first drive cycle.
• The PENDING CODE is available if the PCM detects the above malfunction condition.
• The FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Connector or terminal malfunction
• Open circuit in wiring harness between the battery positive terminal and PCM terminal 1AX
• Short to GND in wiring harness between the battery positive terminal and PCM terminal 1AX
• 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 the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related 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 PCM POWER MONITOR CIRCUIT FOR SHORT TO GND
• Turn the ignition switch off.
• Inspect for continuity between battery positive terminal (wiring harness-side) and body GND.
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to GND, then go to Step 6.
No
Go to the next step.
4
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 6.
No
Go to the next step.
5
INSPECT PCM POWER MONITOR CIRCUIT FOR OPEN CIRCUIT
• Measure the voltage between PCM terminal 1AX (wiring harness-side) and body GND.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P2507 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.