CYLINDER ASSEM. 5J9376 - Caterpillar

Table 3
2. Check the Integrity of the Connections at the Connectors
A. Restore the electrical power to the ECM. Do not start the engine.
B. Install a 7X-1708 Multimeter Probe (RED) and a 7X-1709 Multimeter Probe (BLACK) onto the test leads of a multimeter.
Note: Ensure that the multimeter probes are in good repair. Bent probes may contact other terminals inside the connector.
C. Check for an intermittent problem at the connector for the suspect sensor:
Note: Do not disconnect any harness connectors in order to perform this procedure.
a. Carefully install the spoons (multimeter probes) into the terminal locations for the sensor supply and the sensor return at the appropriate ECM connector.
b. While you observe the voltage reading on the multimeter, wiggle the wires and pull on the wires at the connector for the suspect sensor.
The voltage reading will not vary more than 0.5 V for a solid electrical connection.
c. Remove the spoons (multimeter probes) from the connector.
D. Check for an intermittent problem at the ECM connector:
Note: Do not disconnect any harness connectors in order to perform this procedure.
a. Carefully install the spoons (multimeter probes) into the terminal locations for the sensor supply and the sensor return at the connector for the suspect sensor.
b. Observe the voltage reading on the multimeter. Wiggle the harness and pull on the wires for the sensor supply and the sensor return at the ECM connector.
The voltage reading will not vary more than 0.5 V for a solid electrical connection.
c. Remove the spoons (multimeter probes) from the connector.
E. Remove the electrical power from the ECM.
0.5V Tolerance
Results: The voltage reading did not vary more than 0.5 V.
Repair: The connections are OK at the connectors. There does not appear to be an intermittent problem in the circuit at this time. Return the engine to service.
Results: At least one of the voltage reading varied more than 0.5 V during the test.
Repair: Disconnect the suspect connector and inspect the connector and the terminals for moisture, damage, and corrosion. Repair the connectors and/or the terminals. Return the engine to service.
Table 4
3. Check the Supply Voltage at the Sensor Connector
A. Measure the voltage between terminal 1 (sensor supply) and terminal 2 (sensor return) at the harness connector for the sensor that relates to the code.
S4.5 to 5.5VDC
Results: The voltage is between 4.5 VDC and 5.5 VDC. The supply voltage is at the sensor connector. Record the voltage measurement. If you are troubleshooting a -3 diagnostic code. Proceed to Test Step 4
If you are troubleshooting a -4 diagnostic code.
Proceed to Test Step 7
Results: The voltage is less than 4.5 VDC or the voltage is greater than 5.5 VDC.
Repair: The voltage of the sensor supply is incorrect. Refer to Troubleshooting, "Sensor Supply"
4. Check for Battery Voltage on the Signal Wire
A. Measure the voltage between the signal terminal and the return terminal on the harness connector for the sensor that relates to the diagnostic code.
Battery voltage
Results: The voltage measurement is less than the +Battery voltage. The signal wire is not shorted to the +Battery.
Proceed to