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P0071-AMBIENT AIR TEMPERATURE SENSOR PERFORMANCE (CONTINUED) 2. (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C2 FCM harness connector. Disconnect the AAT Sensor harness connector. NOTE: Visually inspect both the component and the FCM connec- Measure the voltage on the (G31) AAT Signal circuit in the AAT Sen- 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 No >> Go To 3 3. AAT SENSOR VOLTAGE ABOVE 4.6 VOLTS Turn the ignition off. Connect the C2 FCM 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 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 63 |