DTC P2507[MTX, LF ATX (FS5A-EL)]

id0102b4814300

DTC P2507

PCM B+ voltage low
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.
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.
•  DTC is stored in PCM memory.
POSSIBLE CAUSE
•  Meltdown fuse
•  Open circuit in wiring between fuse and PCM terminal 1BA
•  Short to ground between fuse and PCM terminal 1BA
•  Poor connection of PCM connector
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
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 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 FUSE
•  Turn the ignition switch off.
•  Inspect fuse for failure and proper.
•  Is it normal?
Yes
Go to Step 6.
No
•  If fuse has been burnt, then go to the next step.
•  If 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 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 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 for continuity between fuse terminal and PCM terminal 1BA.
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the 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 the DTC from the PCM memory using the M-MDS.
•  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[LF, L3].)
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Perform “AFTER REPAIR PROCEDURE”.
•  Is any DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE[MTX, LF ATX (FS5A-EL)].)
No
Troubleshooting completed.