CM850 Electronic Control System – FAULT CODE 154

Intake Manifold Air Pressure/Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source


Overview

CODE REASON EFFECT
Fault Code: 154
PID: P105
SPN: 105
FMI: 4/4
LAMP: Amber
SRT: 

Intake Manifold Air Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at intake manifold air temperature circuit.

Posible white smoke. Fan will stay ON if controlled by ECM. No engine protection for intake manifold air temperature. Marine: None – No engine protection for circuit or sensor failure.

Intake Manifold Air Temperature Sensor Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The intake manifold air temperature sensor monitors intake manifold air temperature and passes information to the electronic control module (ECM)
through the engine harness.

Component Location

The intake manifold air temperature sensor is located in the air intake manifold. Refer to Procedure 100-002
for a detailed component location view.

Shop Talk

The intake manifold 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 fault codes with multiple counts first.

Possible causes of this fault code include:

  • Signal circuit shorted to ground in the harness.
  • Signal circuit shorted to return or ground in the sensor.

Temperature (°C)
Temperature (°F)
Resistance (ohms)
0
32
29k to 36k
25
77
9k to 11k
40
104
4.9k to 5.8k
100
212
600 to 700

Refer to Troubleshooting Fault Code t05-154

Last Modified:  08-Jul-2010