Conditions that Generate This Code: This diagnostic code is logged when the PL522 and 523 modules detect a battery voltage below 11 VDC. Test Procedure 1. Check the system voltage at the 70-pin connector on the PL522 and 523 modules. Start the engine and run it at high idle for 5 to 10 minutes. Measure the system voltage between the "Unswitched Power" and "Ground" contacts. Pin 52 is the "Unswitched Power" terminal, and pin 65 is the "Ground" terminal.
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Expected Results: 24 VDC systems should have a voltage of 27 VDC to 29 VDC. 12 VDC systems should have a voltage of 13 VDC to 15 VDC.
Result:
• OK - The voltage is correct. Clear this diagnostic code and check for other diagnostic codes. Stop
• Abnormal - The voltage is abnormal. Go to Test Step 2. Test Step 2. Check the Alternator. Operate the engine at high idle for 5 to 10 minutes. Measure the voltage output at the battery terminals.
Expected Results: For 24 VDC systems, the voltage range should be 27 VDC to 29 VDC. For 12 VDC systems, the voltage range should be 13 VDC to 15 VDC.
Result: • OK - The voltage is correct. Go to Test Step 3. • Not OK - The voltage is abnormal. Repair: Repair or replace the alternator.
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Test Step 3. Check the Battery Voltage.
Turn the key switch to the OFF position. Measure the voltage at the battery terminals. Always wear appropriate personal protective equipment.
Expected Results: The voltage on a 12 VDC system should be between 12 VDC and 15 VDC. The voltage on a 24 VDC system should be between 24 VDC and 27 VDC.
Result: • OK - The voltage is between 12 VDC and 15 VDC, or the voltage is between 24 VDC and 27 VDC. Repair: PL522 or 523 may be faulty. Recheck the system before replacing PL522 or 523. PL522 or 523 is rarely the source of the fault. Refer to System Operation, Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replacement." After replacing PL522 or 523, recheck the system and check the status of the diagnostic code. Stop • Not OK - The voltage is not between 12 VDC and 15 VDC, or the voltage is not between 24 VDC and 27 VDC. Repair: Refer to Special Instruction, REHS0354, "Charging System Troubleshooting." If the condition does not improve, PL522 or 523 may be faulty. Recheck the system before replacing PL522 or 523. PL522 or 523 is rarely the source of the fault. Refer to "Electronic Control Module (ECM) - Replacement" in Systems Operation, Troubleshooting, Testing and Adjusting. After replacing PL522 or 523, recheck the system and check the status of the diagnostic code.
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