TEST ACTION APPLICABILITY
2 NOTE: Visually inspect both the component and the PCM connectors. Look
for damage, partially broken wires and backed out or corroded terminals
Turn the ignition off.
Disconnect the Ambient Air Temp Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the (K145)AAT Signal circuit intheAmbientAir Temperature
Sensor harness connector.
Is the voltage above 5.2 volts?
All
Yes → Repair the short to battery voltage in the (K145) AAT Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
3 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIIIt, read the Ambient Air Temperature Sensor voltage.
Is the voltage above 4.9 volts?
All
Yes → Go To 4
No → Go To 7
4 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Using a jumper wire, jumper across the Ambient Air Temperature Sensor harness
connector.
Ignition on, engine not running.
With the DRBIIIt, read the Ambient Air Temperature voltage.
Is the voltage below 0.1 volt?
All
Yes → Replace the Ambient Air Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 5
5 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K145) AAT Signal circuit from the Ambient Air
Temperature Sensor harness connector to the appropriate terminal of special tool
#8815.
Is the resistance below 5.0 ohms?
All
Yes → Go To 6
No → Repair the open in the (K145) AAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
49
DRIVEABILITY - NGC
P0071-AMBIENT TEMP SENSOR PERFORMANCE — Continued
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