FRAME AS 1103913 - Caterpillar

Table 2
Troubleshooting Test Steps Values Results
1. Determine if the Code is Logged or Active
A. Connect Cat ET to the service tool connector.
B. Restore electrical power to the engine ECM.
C. Monitor the active diagnostic code and the logged diagnostic codes on Cat ET.
Note. Wait at least 30 seconds in order for diagnostic codes to become active.
D. Identify the diagnostic code.
Active or logged code
Result: Logged code
Repair: Do not troubleshoot a logged code unless the code relates to an operator complaint. If the code is logged and the code does not relate to an operator complaint, clear the code.
If the code is logged, and the code relates to an operator complaint. Proceed to Test Step 2.
Result: Active code
Proceed to Test Step 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.
1. Carefully insert the probes into the terminal locations for the sensor supply and the sensor return at the appropriate ECM connector.
2. 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.
3. Remove the 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.
1. Carefully insert the probes into the terminal locations for the sensor supply and the sensor return at the connector for the suspect sensor.
2. 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.
3. Remove the probes from the connector.
0.5V Tolerance
Result: 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.
Result: 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.
Verify that the repair eliminated the problem.
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.
4.5 to 5.5 VDC
Result: The voltage is between 4.5 VDC and 5.5 VDC. The supply voltage is at the sensor connector. Record the voltage measurement.
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