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Symptom: P1594-CHARGING SYSTEM VOLTAGE TOO HIGH - DIESEL When Monitored and Set Condition: P1594-CHARGING SYSTEM VOLTAGE TOO HIGH - DIESEL When Monitored: With the engine running. Set Condition: The voltage at PCM cavity C1-22 is 1.0 volt or more above the target charging voltage for at least 3 seconds. POSSIBLE CAUSES INTERMITTENT CONDITION GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND POWERTRAIN CONTROL MODULE (TARGET CHARGING VOLTAGE TOO LOW) GENERATOR SHORTED TO GROUND INTERNALLY POWERTRAIN CONTROL MODULE (FIELD DRIVER SHORTED TO GROUND) TEST ACTION APPLICABILITY 1 NOTE: The battery must be fully charged and the generator belt must be in All Yes → No → NOTE: With the DRB, stop the Generator Field actuation. 2 Start the engine. All Yes → No → Replace and program the Powertrain Control Module in accor- 33 CHARGING |