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Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 153 PID: P105 SPN: 105 FMI: 3/3 LAMP: Amber SRT: |
Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at intake manifold air temperature circuit. |
Possible white smoke. Fan will stay ON if controlled by the ECM. No engine protection for intake manifold air temperature. |
 ISX – Intake Manifold 1 Pressure Sensor Circuit
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 ISM – Intake Manifold 1 Pressure Sensor Circuit
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Circuit Description
The intake manifold temperature sensor is a variable resistor sensor and is used to measure the temperature of the air entering the intake manifold of the engine. The electronic control module (ECM) supplies 5 volts to the intake manifold temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold temperature.
Component Location
The intake manifold air temperature sensor is located in the air intake manifold. Refer to Procedure 100-002 in Section E.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes
The ECM detects that the intake manifold temperature signal voltage is greater than 5.13-VDC for more than 1 second.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- A default value is used for the intake manifold temperature reading.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM. Refer to Procedure 019-032 in Section 19.
The intake manifold air temperature sensor shares return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Check active fault codes with multiple counts first.
Possible causes of this fault code include:
- Open return circuit in the harness, connectors, or sensor.
- Open signal circuit or shorted to voltage source.
Refer to Troubleshooting Fault Code t05-153
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