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ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT (CONTINUED) 7. READ A/C HEATER CONTROL MODULE DTC’S WITH DRB III T Turn the ignition off. Reconnect the Engine Coolant Temperature Sensor connector. Turn the ignition on. With the DRB III T , read A/C Heater Control Module DTC’s. Wait two minutes. With the DRB III T , read A/C Heater Control Module DTC’s. Does the DRB III T display an Engine Coolant Temperature Sen- sor Failure DTC? Yes >> Replace the Engine Coolant Temperature Sensor. (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT TEMP Perform BODY VERIFICATION TEST. No >> Go to 8 8. READ A/C HEATER CONTROL MODULE DTC’S WITH DRB III T Ensure the Engine Coolant Temperature Sensor is connected at this Start the engine. Turn the A/C system on and run for at least five minutes. With the DRB III T , read A/C Heater Control Module DTC’s. Does the DRB III T display an Engine Coolant Temperature Sen- sor Failure DTC? Yes >> Replace the Engine Coolant Temperature Sensor. (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT TEMP Perform BODY VERIFICATION TEST. No >> The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. Perform BODY VERIFICATION TEST. 9. MEASURE THE RESISTANCE BETWEEN GROUND AND THE ENGINE COOLANT TEMPERATURE Turn the ignition off. Disconnect the Powertrain Control Module harness connector. Note: Check connector - Clean/repair as necessary. Is the resistance below 1000.0 ohms? Yes >> Repair the Engine Coolant Temperature Sensor Signal cir- cuit for a short to ground. Perform BODY VERIFICATION TEST. No >> Go to 10 ZH HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS 24 - 31 |