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2. (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C2 BCM harness connector. Disconnect the AAT Sensor harness connector. NOTE: Visually inspect both the component and the BCM connec- Measure the voltage on the (G31) AAT Signal circuit in the AAT Sensor Is the voltage above 5.2 volts? Yes >> Repair the short to voltage in the (G31) AAT Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 3 3. AAT SENSOR VOLTAGE ABOVE 4.6 VOLTS Turn the ignition off. Connect the C2 BCM harness connector. Ignition on, engine not running. With a scan tool, read the AAT voltage. Is the voltage above 4.6 volts? Yes >> Go To 4 No >> Go To 7 4. AAT SENSOR Connect a jumper wire between the (G31) AAT Signal circuit and the With a scan tool, read the AAT voltage. Is the voltage below 1.0 volt with the jumper wire installed? Yes >> Replace the AAT Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 5 NOTE: Remove the jumper wire before continuing. 9 - 50 ENGINE ELECTRICAL DIAGNOSTICS KJ |