0105-03 Inlet Manifold Temp Sensor Open Circuit (38)

115

TM 9-2320-312-24-2

Troubleshooting Section

Note: Do not expect the sensor and the

Engine Response Occasionally, the engine may

thermocouple probe from the 6V-9130 Temperature

emit white smoke on start-up and misfire during

Adapter to respond to the temperature change at

cold ambient air temperatures.

the same rate.

Troubleshooting:

Results:

Perform the following diagnostic procedure: "Engine

Yes The sensor is functioning correctly. If

Temperature Sensor Open or Short Circuit - Test"

a problem is still suspected the problem is a

mechanical problem. The problem is not an

Results:

electronic problem.

OK STOP.

Repair: Perform the following diagnostic

procedure:

i01638755

0105-04 Inlet Manifold Temp

Refer to Troubleshooting, "Troubleshooting without

a Diagnostic Code" for a procedure that best

Sensor Short Circuit (38)

describes the conditions.

SMCS Code: 1408-081; 1921-038

STOP.

Conditions Which Generate This Code:

The Air Temperature signal voltage for the inlet air

Repair: Perform the following diagnostic

temperature sensor is below the acceptable range.

procedure:

System Response:

1. Temporarily install another sensor.

Electronic System Response The inlet manifold

2. Repeat this test step.

air temperature is set to 85 C (185 F) while the

diagnostic code is active.

3. If the problem is resolved with the new sensor,

replace the sensor.

Service Tool Display or Lamps Caterpillar

Electronic Technician (ET) will indicate 85 C

4. Verify that the repair eliminates the problem.

(185 F) and display "DIAG" next to "Intake Manifold

Air Temperature" on the status screen while the

STOP.

diagnostic code is active. The Check Engine Lamp

will NOT illuminate unless this diagnostic code has

i01638750

been active for 10 hours.

0105-03 Inlet Manifold Temp

Engine Response Occasionally, the engine may

Sensor Open Circuit (38)

emit white smoke on start-up and misfire during

cold ambient air temperatures.

SMCS Code: 1408-081; 1921-038

Troubleshooting:

Conditions Which Generate This Code:

Perform the following diagnostic procedure: "Engine

Temperature Sensor Open or Short Circuit - Test"

The Air Temperature signal voltage for the inlet air

temperature sensor is above the acceptable range.

Results:

System Response:

OK STOP.

Electronic System Response The Inlet Manifold

Air Temperature is set to 85 C (185 F) while the

diagnostic code is active.

Service Tool Display or Lamps Caterpillar

Electronic Technician (ET) will indicate 85 C

(185 F) and display "DIAG" next to "Intake Manifold

Air Temperature" on the status screen while the

diagnostic code is active. The Check Engine Lamp

will NOT illuminate unless this diagnostic code has

been active for 10 hours.