DTC P2502 [L8, LF]

id0102b1814000

DTC P2502 | Charging system voltage problem
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DETECTION CONDITION | • The PCM judges the generator output voltage is above 17 V or battery voltage is below 11 V during the engine running. Diagnostic support note • This is a continuous monitor (other). • The MIL does not illuminate. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • MAIN 120 A fuse malfunction • Short to ground in wiring harness at downstream circuit from MAIN 120 A fuse • Battery malfunction • Generator is poorly connected • Battery is poorly connected • Open circuit between generator terminal B and battery positive terminal • Generator malfunction • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (other related) been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS 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. • Disconnect the negative battery cable. • Remove the MAIN 120 A fuse. (See MAIN FUSE REMOVAL/INSTALLATION.) • Inspect the fuse. • Is there any malfunction? | Yes | If the fuse is melt: • Repair or replace the wiring harness for a possible short to ground. • Replace the fuse. (See MAIN FUSE REMOVAL/INSTALLATION.) If the fuse is deterioration: • Replace the fuse. (See MAIN FUSE REMOVAL/INSTALLATION.) Go to Step 9.
No | Install the fuse, then go to the next step.
4 | INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Recharge or replace the battery, then go to Step 9. (See BATTERY RECHARGING [L8, LF].) (See BATTERY REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
5 | INSPECT POOR INSTALLATION OF GENERATOR TERMINAL • Turn the ignition switch off. • Inspect for looseness of generator terminal B installation nut. • Is the nut loose? | Yes | Tighten generator terminal B installation nut, then go to Step 9.
No | Go to the next step.
6 | INSPECT POOR INSTALLATION OF BATTERY POSITIVE TERMINAL • Inspect for looseness of battery positive terminal. • Is the terminal loose? | Yes | Connect the battery positive terminal correctly, then go to Step 9.
No | Go to the next step.
7 | INSPECT BATTERY CHARGING CIRCUIT FOR OPEN CIRCUIT • Measure the voltage between generator terminal B (wiring harness-side) and body ground. • 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 Step 9.
8 | INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
9 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Perform the KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
No | DTC troubleshooting completed.