DTC P2507:00 [ZJ, ZY]

id0102c0709800

DTC P2507:00

PCM power input signal low input
DETECTION CONDITION
•  The PCM monitors the voltage of the backup battery positive. 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.
•  FREEZE FRAME DATA is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  Battery malfunction
•  PCM connector or terminals malfunction
•  Open circuit or short to ground in wiring harness between the battery positive terminal and PCM terminal 1BC
―  Short to ground in wiring harness between the battery positive terminal and PCM terminal 1BC
―  MAIN 200 A fuse and/or EGI 10 A fuse malfunction
―  Open circuit in wiring harness between the battery positive terminal and PCM terminal 1BC
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the 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 SERVICE 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 BATTERY
•  Turn the ignition switch off.
•  Inspect the battery.
•  Is there any malfunction?
Yes
Recharge or replace the battery, then go to Step 6.
(See BATTERY RECHARGING [ZJ, ZY].)
(See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].)
No
Go to the next step.
4
INSPECT PCM CONNECTOR AND TERMINALS
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 6.
No
Go to the next step.
5
INSPECT PCM POWER MONITOR CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
•  PCM connector is disconnected.
•  Measure the voltage between PCM terminal 1BC (wiring harness-side) and body ground.
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the MAIN 200 A fuse and EGI 10 A fuse.
•  If the fuse is melt:
―  Repair or replace the wiring harness for a possible short to ground.
―  Replace the malfunctioning fuse.
•  If the fuse is deterioration:
―  Replace the malfunctioning fuse.
•  If the fuse is normal:
―  Repair or replace the wiring harness for a possible open circuit.
Go to the next step.
6
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Perform the KOEO/KOER self test.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [ZJ, ZY].)
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.
(See DTC TABLE [ZJ, ZY].)
No
DTC troubleshooting completed.