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P0128-THERMOSTAT RATIONALITY (CONTINUED) 8. TEMPERATURE SENSOR Turn the ignition off. Connect the C2 FCM harness connector and the C2 PCM harness Connect a jumper wire across the ECT and AAT Sensor harness con- Ignition on, engine not running. With a scan tool, read the Temperature Sensor voltage. Does the voltage start at 5.0 volts and drop below 1.0 volt when Yes >> Replace the appropriate Temperature Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 9 NOTE: Disconnect the jumper wire before continuing. 9 - 144 ENGINE ELECTRICAL DIAGNOSTICS WK |