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Symptom List: P1682-CHARGING SYSTEM VOLTAGE TOO LOW - DIESEL Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P1682-CHARGING SYSTEM When Monitored and Set Condition: P1682-CHARGING SYSTEM VOLTAGE TOO LOW - DIESEL When Monitored: With the engine running. Set Condition: The voltage at PCM cavity C1-22 is 0.5 volt or more below the target charging voltage for at least 3 seconds. POSSIBLE CAUSES CHECK FOR CYCLING VOLTAGE ON THE GENERATOR FIELD DRIVER CIRCUIT INTERMITTENT CONDITION GENERATOR BELT CONDITION OR TENSION HIGH RESISTANCE IN THE FUSED B+ CIRCUIT TO THE PCM GENERATOR FIELD DRIVER CIRCUIT SHORTED TO VOLTAGE GENERATOR FUSED B+ CIRCUIT HIGH RESISTANCE ASD RELAY OUTPUT CIRCUIT OPEN GENERATOR GROUND CIRCUIT HIGH RESISTANCE GENERATOR FIELD DRIVER CIRCUIT OPEN POWERTRAIN CONTROL MODULE TEST ACTION APPLICABILITY 1 NOTE: Inspect the vehicle for aftermarket accessories that may exceed the All Yes → No → Repair as necessary. 41 CHARGING |