P0098-INTAKE AIR TEMPERATURE SENSOR 2 CIRCUIT HIGH

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Intake Air Temperature Sensor 2 is combined with the Boost Pressure Sensor. It is located on the hose leading into the EGR Airflow Control Valve and is used to monitor the temperature of the air entering the Intake Manifold. The Intake Air Temperature Sensor 2 operates as a typical two wire sensor. It receives a 5-Volt signal on the (K21) Intake Air Temperature Sensor 2 Signal circuit and shares the (K656) ground circuit with the Boost Pressure Sensor. When this fault code is active the EGR system and DPF regeneration will be disabled.

When Monitored:
With the ignition on.
Set Condition:
The (K21) Intake Air Temperature Sensor 2 Signal circuit voltage is above 3.2 Volts for two seconds.

Possible Causes
(K21) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K21) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
(K656) BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR GROUND 2 CIRCUIT OPEN/HIGH RESISTANCE
BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR 2
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1. DTC IS ACTIVE

1.	Ignition on, engine not running.

2.	With the scan tool, Clear DTCs in the PCM.

3.	Monitor the scan tool for at least two minutes.

4.	Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.

5.	With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go To 2

Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

2. CHECK THE (K21) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

1.	Turn the ignition off.

2.	Disconnect the Boost Pressure/Intake Air Temperature Sensor 2 harness connector.

3.	Disconnect the PCM C1 harness connector.

4.	Remove the ASD Relay from the TIPM.

5.	Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.

6.	Turn the ignition on.

7.	Measure the voltage of the (K21) Intake Air Temperature Sensor Signal circuit in the Boost Pressure/Intake Air Temperature Sensor 2 harness connector.

Is there any voltage present?

Yes

Repair the (K21) Intake Air Temperature Sensor 2 Signal circuit for a short to voltage.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 3

3. CHECK THE (K21) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL FOR AN OPEN/HIGH RESISTANCE

1.	Turn the ignition off.

2.	Remove the jumper wire and install the ASD Relay.

3.	Measure the resistance of the (K21) Intake Air Temperature Sensor 2 Signal circuit between the Boost Pressure/Intake Air Temperature Sensor 2 harness connector and the PCM C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

Go To 4

Repair the (K21) Intake Air Temperature Sensor 2 Signal circuit for an open or high resistance.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

4. CHECK THE (K656) INTAKE AIR TEMPERATURE SENSOR 2 GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE

1.	Measure the resistance of the (K656) Intake Air Temperature Sensor 2 Ground circuit between the Boost Pressure/Intake Air Temperature Sensor 2 harness connector and the PCM C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

Go To 5

Repair the (K656) Intake Air Temperature Sensor 2 Ground circuit for an open or high resistance.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

5. BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR 2

1.	Turn the ignition off.

2.	Reconnect the Boost Pressure/Intake Air Temperature Sensor 2 harness connector.

3.	Reconnect the PCM C1 harness connector.

4.	Turn the ignition on.

5.	With the scan tool, erase DTCs.

6.	Turn the ignition off.

7.	Disconnect the Boost Pressure/Intake Air Temperature Sensor harness connector.

8.	Connect a jumper between the (K656) Boost Pressure/Intake Air Temperature Sensor 2 Ground circuit and the (K21) Intake Air Temperature Sensor 2 Signal circuit at the Boost Pressure/Intake Air Temperature Sensor harness connector.

9.	Turn the ignition on.

10.	With the scan tool, select View DTCs.

NOTE: The scan tool should display a P0097-Intake Air Temperature Sensor Low DTC as active with the jumper wire in place.

Does the scan tool display the DTC as described above?

Yes

Replace the Boost Pressure/Intake Air Temperature Sensor 2 in accordance with the Service Information.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 6

6. POWERTRAIN CONTROL MODULE

1.	Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Intake Air Temperature Sensor 2 and the Powertrain Control Module (PCM).

2.	Look for any chafed, pierced, pinched, or partially broken wires.

3.	Look for broken, bent, pushed out or corroded terminals.

4.	Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

Repair as necessary.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Replace the Powertrain Control Module in accordance with the Service Information.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

P0098-INTAKE AIR TEMPERATURE SENSOR 2 CIRCUIT HIGH

Theory of Operation

Possible Causes