P0070-AMBIENT AIR TEMPERATURE SIGNAL VOLTAGE TOO LOW

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The Ambient Air Temperature Sensor signal is below 0.068 volt.

Possible Causes

AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND

AMBINET TEMPERATURE SENSOR

ENGINE CONTROL MODULE

Diagnostic Test

1.CHECK FOR ACTIVE DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Did this DTC set again?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.AMBIENT TEMPERATURE SENSOR

Does the scan tool display P0070 AMB TEMP SENSOR SIGNAL VOLTAGE TOO HIGH?

Yes

Replace the Ambient Temperature Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To3

3.AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance above 1000 ohms?

Yes

Go To4

Repair the Ambient Air Temperature Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

4.AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND

Is the resistance above 1000 ohms?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Ambient Air Temperature Sensor Signal circuit for a short to the Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).