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Intake Manifold Air Pressure/Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
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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
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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.
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Temperature (°C)
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Temperature (°F)
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Resistance (ohms)
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0
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32
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29k to 36k
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25
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77
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9k to 11k
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40
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104
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4.9k to 5.8k
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100
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212
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600 to 700
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Refer to Troubleshooting Fault Code t05-154
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