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P2181-COOLING SYSTEM PERFORMANCE (CONTINUED) 4. ECT SENSOR Connect a jumper between the (K2) ECT Signal circuit and the (K900) Turn the ignition off. Disconnect the ECT Sensor harness connector. With a scan tool, read the ECT voltage. Is the voltage below 1.0 volt? Yes >> Replace the ECT Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 5 5. (K2) ECT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K2) ECT Signal circuit in the ECT Sensor Is the voltage above 5.2 volts? Yes >> Repair the short to battery voltage in the (K2) ECT Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 6 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 963 |