ELBOW 0307941 - Caterpillar

Illustration 1 g00564745
Note: Ensure that the desired diagnostic code (CID FMI) is on hold. Ensure that the "SERV CODE" indicator is ON. The operator should use the electrical system schematic for the engine that is being serviced to find the connector contact on the Main Display Module that corresponds to the current CID that is shown.The diagnostic code is recorded when the Main Display Module reads an abnormal sensor signal. The sensor signal is not identifiable to the input circuitry of the Main Display Module. This diagnostic code will make the corresponding Alert indicator flash and the Gauge Needle will move to the warning region. The following examples are possible causes.
The pressure sensor (boost) has a problem.
The ground circuit of the pressure sensor (boost) is open in the engine harness.
The signal circuit of the pressure sensor (boost) is shorted to +Battery in the engine harness.
The signal circuit of the pressure sensor (boost) is open or the connector is disconnected in the engine harness.
The Main Display Module has a problem.
Check The Display Area And The Harness.
Turn the "ECS" switch to the OFF/RESET position.
Check for loose terminal connections or corroded terminal connections.
Clean corroded terminals and tighten loose connections.
Turn the "ECS" switch to the COOLDOWN/STOP position. The "SERV CODE" indicator should be ON for CID 0102 FMI 08.
Measure The Voltage Of The Supply Wire For The Pressure Sensor (Boost).
Turn the "ECS" switch to the COOLDOWN/STOP position.
Use the 7X-1710 Multimeter Probe to measure the voltage from ground wire of the pressure sensor (pin B) to the supply wire (pin A).Expected Result: The voltage should be 8.0 0.5 DCV.Results:
OK: The voltage is 8.0 0.5 DCV. The voltage is correct. Proceed to Step 3.
Not OK: The voltage is less than 0.5 DCV. The harness wiring has a problem. There is an open circuit, a short to ground in the supply wire of the pressure sensor (boost), or a poor connection. Repair the harness or replace the harness. If the cause of the diagnostic code is not found, proceed to Step 3.
Measure The Signal Voltage Of The Pressure Sensor (Boost) .
Turn the "ECS" switch to the COOLDOWN/STOP position.
Use the 7X-1710 Multimeter Probe to measure voltage from the ground wire of the pressure sensor (boost) (pin B) to the supply wire (pin C).Expected Result: The voltage should be between 1.0 DCV and 7.0 DCV.Results:
OK: The voltage is between 1.0 DCV and 7.0 DCV. The signal voltage at the sensor is correct. Proceed to Step 4.
Not OK: The voltage is NOT between 1.0 DCV and 7.0 DCV. The signal voltage at the sensor is not correct. If the voltage is greater than 7.0 DCV, proceed to Step 5. If the voltage is less than 1.0 DCV, proceed to Step 6.
Measure The Voltage Of The Pressure Signal.
Turn the "ECS" switch to the COOLDOWN/STOP position.
Use the 7X-1710 Multimeter Probe to measure the voltage from the ground wire of the main display module to the signal wire connector contact.Expected Result: The voltage should be similar to the voltage in