SPN 105 - FMI 3 (Fault Code 153)

SPN 105 - FMI 3 (Fault Code: 153)
ISB, ISC, and ISL - Intake Manifold 1 Temperature Sensor Circuit

Fault Code: 153
PID(P), SID(S): P105
SPN: 105
FMI: 3/3

REASON: Intake Manifold 1 Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage detected at intake manifold air temperature circuit.

EFFECT: Possible white smoke. Fan will stay ON if controlled by the ECM. No engine protection for intake manifold air temperature.

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.

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.
  • 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.

Read More:
SPN 110 - FMI 0 (Fault Code 151)
SPN 110 - FMI 16 (Fault Code 146)


Subscribe to receive free email updates:

0 Response to "SPN 105 - FMI 3 (Fault Code 153)"

Post a Comment