P0112-INTAKE AIR TEMPERATURE SENSOR CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The (K48) Intake Air Temperature Sensor Signal circuit voltage is below 1.51 volts for 0.48 seconds.

Possible Causes

INTERMITTENT DTC

(K48) INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

(K48) INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (K656) INTAKE AIR TEMPERATURE SENSOR GROUND

INTAKE AIR TEMPERATURE/BOOST PRESSURE SENSOR

ENGINE CONTROL MODULE (ECM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Diagnostic Test

1.DTC IS ACTIVE

Is the status Active for this DTC?

Yes

Go To 2

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

2.(K48) INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance above 1000 ohms?

Yes

Go to 3

Repair the (K48) Intake Air Temperature Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

3.(K48) INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (K656) INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT

Is the resistance above 1000 ohms?

Yes

Go to 4

Repair the (K48) Intake Air Temperature Sensor Signal circuit for a short to the (K656) Intake Air Temperature Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

4.INTAKE AIR TEMPERATURE/BOOST PRESSURE SENSOR

NOTE: The scan tool should display an Intake Air Temperature Sensor high voltage or open circuit DTC with the Intake Air Temperature Sensor connector disconnected.

Does the scan tool display the DTC(s) as described above?

Yes

Replace the Intake Air Temperature/Boost Pressure Sensor in accordance with the service information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 5

5.ENGINE CONTROL MODULE (ECM)

Were any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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