Dodge Ram Truck 1500-2500-3500. Manual — part 1042

P0108-INLET AIR Pressure Sensor Voltage Too high (CONTINUED)

8.

ECM

Install the ECM harness connector.

Turn the ignition on.

While monitoring scan tool, use a jumper wire to connect the (K916)
Return circuit with the (K616) signal circuit at the Inlet Air Pressure
sensor harness connector.

Did DTC P0107 set?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom

(Diagnostic Procedure).

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING) 0

No

>> Replace the ECM.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

9 - 1090

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0111-INTAKE AIR TEMPERATURE (IAT) SENSOR RATIONALITY

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1091

P0111-INTAKE AIR TEMPERATURE (IAT) SENSOR RATIONALITY (CONTINUED)

For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
While the engine is running.

•

Set Condition:
The ECM does not read a change in value from the sensor over time.

Possible Causes

FAILED IAT SENSOR

INTERMITTENT CONDITION

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

Diagnostic Test

1.

FAILED IAT SENSOR

Remove the temperature sensor and reconnect the wiring to the sensor. Monitor scan tool, while heating the sensor
with an external heat source (DO NOT USE OPEN FLAME).

Does the reading from the sensor increase at least 5 degrees F. on the scan tool?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE -

DIAGNOSIS AND TESTING)

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

No

>> Replace the Intake air temp sensor/MAP sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

9 - 1092

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0112-INTAKE AIR TEMPERATURE (IAT) SENSOR VOLTAGE TOO LOW

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1093