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Intake Manifold Temperature Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 154 PID: P105 SPN: 105 FMI: 4/4 LAMP: Yellow SRT: |
Low voltage detected at the intake manifold temperature circuit. |
Possible white smoke. Fan will stay on if controlled by the electronic control module (ECM). No engine protection for coolant temperature. |
 Intake Manifold Temperature Sensor Circuit
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Circuit Description
The ECM uses the intake manifold pressure/temperature sensor to monitor the temperature of the engine intake air. The ECM uses the intake manifold temperature signal for the engine protection system, timing, and fueling control.
Component Location
The intake manifold pressure/temperature sensor is on the side of the intake manifold in front of the air horn.
Shop Talk
The sensor resistance varies with the temperature. Compare your reading to this table:
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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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30k to 36k
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25
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77
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9k to 11k
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50
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122
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3k to 4k
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75
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167
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1350 to 1500
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100
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212
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600 to 675
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Refer to Troubleshooting Fault Code t05-154.
Last Modified: 26-Oct-2010
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