Cummins ISX11.9 CM2250 (2010-12) Fault Code: 692 PID: 351 SPN: 1172 FMI: 4 Turbocharger 1 Compressor Intake Temperature Circuit- Voltage Below Normal or Shorted to Low Source
Circuit Description
The turbocharger compressor intake temperature sensor is a variable resistor sensor and is used to measure the temperature of the air entering the compressor intake of the turbocharger. The electronic control module (ECM) supplies 5-VDC to the compressor intake temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the air temperature.
Component Location
Some engines use a combination ambient air pressure/temperature sensor located in the OEM intake air plumbing, rather than a turbocharger compressor intake temperature sensor. Refer to the engine wiring diagram to determine which sensor the engine is equipped with.
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 compressor intake temperature signal voltage is less than 0.05-VDC for more than 10 seconds.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
A default value for the compressor intake temperature reading is used.
Conditions for Clearing the Fault Code
To validate the repair, start the engine and let it idle for 1 minute.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
For On Board Diagnostic (OBD) engines, the ECM will turn off the MIL after 3 consecutive trips where the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk
The turbocharger compressor intake air temperature sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active. Before troubleshooting Fault Code 692, check for multiple fault codes. An extension harness between the main engine harness and the turbocharger compressor intake temperature sensor can be used depending on the turbocharger arrangement.
Possible causes of this fault code:
Signal circuit shorted to ground in the harness
Signal circuit shorted to return or ground in the sensor
Damaged sensor.
Possible Cause:
1) ECM failure
2) Engine harness
3) OEM harness
4) ECM calibration
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