DTC P2507:00

DTC P2507:00	PCM battery voltage low input
DETECTION CONDITION	The PCM monitors the voltage of backup battery positive terminal. If the PCM detects battery positive terminal voltage below 2.5 V for 5 s when the battery voltage is more than 8 V, the PCM determines that the backup voltage circuit has a malfunction. Diagnostic support note This is a continuous monitor (CCM). The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in PCM memory.
POSSIBLE CAUSE	Battery malfunction PCM connector or terminals malfunction Short to ground or open circuit in PCM power supply circuit Short to ground in wiring harness between battery positive terminal and PCM terminal 1C ENG+B 10 A fuse malfunction Open circuit in wiring harness between battery positive terminal and PCM terminal 1C PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED. Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line 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.
2		No	Go to the next step.
3	INSPECT BATTERY Inspect the battery. (See BATTERY INSPECTION [LF, L5] ). Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [LF, L5] ). (See BATTERY REMOVAL/INSTALLATION [LF, L5] ).
3		No	Go to the next step.
4	INSPECT PCM CONNECTOR CONDITION Switch the ignition to 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 and/or connector, then go to Step 6.
4		No	Go to the next step.
5	INSPECT MONITOR CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT PCM connector is disconnected. Measure the voltage between PCM terminal 1C (wiring harness-side) and body ground. Is the voltage B+ ?	Yes	Go to the next step.
5		No	Inspect the ENG+B 10 A fuse. If the fuse is melted: Repair or replace the wiring harness for a possible short to ground. Replace the fuse. If the fuse is deteriorated: Replace the 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. (See AFTER REPAIR PROCEDURE ). Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST ). Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION ). Go to the next step.
6		No	Go to the next step.
7	VERIFY AFTER REPAIR PROCEDURE. Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
7		No	DTC troubleshooting completed.