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Symptom: P1660-REDUNDANT EMERG. STOP POWERSTAGE DEFECTIVE When Monitored and Set Condition: P1660-REDUNDANT EMERG. STOP POWERSTAGE DEFECTIVE When Monitored: With the ignition on. Set Condition: The ECM detects an open or short to ground on the fuel shutdown solenoid control circuit. POSSIBLE CAUSES INTERMITTENT CONDITION FUEL SHUTDOWN SOLENOID CONTROL CIRCUIT OPEN FUEL SHUTDOWN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND FUEL SHUTDOWN SOLENOID (FUEL INJECTION PUMP) SHORTED INTERNALLY INTERNAL FUEL INJECTION PUMP TEST ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → No → 2 Turn the ignition off. All Yes → No → Repair the Fuel Shutdown Solenoid Control circuit for an open. 148 DRIVEABILITY - DIESEL |