P0113 - Intake Air Temperature Sensor 1 Circuit High
Theory of Operation
The Intake Manifold Temperature (IMT) Sensor is located on the intake manifold on the Regular Cab. For the Cab and Chassis, it is a part of the Temperature/Pressure MAP Sensor. The IMT Sensor is used to measure the temperature of the air in the intake manifold. The Powertrain Control Module (PCM) supplies 5-Volts to the intake manifold temperature signal circuit. The PCM monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold temperature. The MIL lamp is illuminated immediately when the diagnostic runs and fails. During this time the customer may notice periods of white smoke as well as the fan running more often. The MIL lamp is turned off once the diagnostic runs and passes in four consecutive drive cycles.
When Monitored and Set Conditions
When Monitored: This diagnostic runs continuously when the following conditions are met:
• With the ignition on.
Set Conditions:
• The Powertrain Control Module (PCM) has detected the Intake Manifold Temperature Sensor circuit is
above a calibrated threshold.
Default Actions:
• The MIL is illuminated.
Possible Causes
INTAKE MANIFOLD TEMPERATURE SIGNAL CIRCUIT SHORTED TO VOLTAGE
INTAKE MANIFOLD TEMPERATURE SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
INTAKE MANIFOLD TEMPERATURE RETURN CIRCUIT OPEN/HIGH RESISTANCE
TEMPERATURE/PRESSURE MAP SENSOR
POWERTRAIN CONTROL MODULE (PCM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTCBased Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
Diagnostic Test
1. ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Turn the ignition on.
6. With the scan tool, read DTCs.
Did the DTC reset?
Yes
• Go To 2
No
• Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (K21) INTAKE MANIFOLD TEMPERATURE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1.
2. Ignition on.
3. Disconnect the T/P MAP sensor harness connector.
NOTE: Check connectors - Clean/repair as necessary.
4. With a voltmeter connected to ground, measure the voltage of the (K21) Intake Manifold Temperature
Signal circuit at the T/P MAP sensor harness connector.
Is the voltage above 5.1 Volts?
Yes
• Repair the (K21) Intake Manifold Temperature Signal circuit for a short to voltage.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
• Go To 3
3. CHECK THE T/P MAP SENSOR
1. Turn the ignition off.
2. Measure the resistance across terminals 3 and 4 of the T/P MAP sensor harness connector.
Is the resistance between 300 and 90k Ohms?
Yes
• Go To 4
No
• Replace the Temperature/Pressure MAP Sensor in accordance with the service information.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
4. CHECK THE (K21) INTAKE MANIFOLD TEMPERATURE SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Disconnect the PCM C1 harness connector.
NOTE: Check connectors - Clean/repair as necessary.
2. Measure the resistance of the (K21) Intake Manifold Temperature Signal circuit between the T/P MAP sensor harness connector and the PCM C1 harness connector.
Is the resistance below 5.0 Ohms?
Yes
• Go To 5
No
• Repair the (K21) Intake Manifold Temperature Signal circuit for an open or high resistance.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
5. CHECK THE (K916) T/P MAP RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K916) T/P MAP Return circuit between the T/P MAP sensor harness connector and the PCM C1 harness connector.
Is the resistance below 5.0 Ohms?
Yes
• Replace the Powertrain Control Module in accordance with the service information.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
• Repair the (K916)T/P MAP Return circuit for an open or high resistance.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).