|
|
|
Symptom: P1491-RAD FAN CONTROL RELAY CIRCUIT When Monitored and Set Condition: P1491-RAD FAN CONTROL RELAY CIRCUIT When Monitored: With the ignition on. Battery voltage greater than 10.4 volts. Set Condition: An open or shorted circuit is detected in the radiator fan relay control circuit. POSSIBLE CAUSES RADIATOR FAN RELAY OPERATION GROUND CIRCUIT RADIATOR FAN RELAY (N173) RADIATOR FAN RELAY CONTROL CIRCUIT OPEN (IPM) (K173) RADIATOR FAN RELAY CONTROL CIRCUIT OPEN (PCM) (N173) RADIATOR FAN RELAY CONTROL CIRCUIT SHORTED TO GROUND (IPM) (K173) RADIATOR FAN RELAY CONTROL CIRCUIT SHORT TO GROUND (PCM) INTELLIGENT POWER MODULE (SHORTED) INTELLIGENT POWER MODULE (OPEN) PCM TEST ACTION APPLICABILITY 1 Turn the ignition on. t, actuate the Radiator Fan Relay. Do the fans operate? All Yes → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. No → Go To 2 2 Turn the ignition off. All Yes → Go To 3 No → Repair the Ground circuit for an open. Perform POWERTRAIN VERIFICATION TEST VER - 5. 179 DRIVEABILITY - SBEC |