WIRE ROPE- 4541844 - Caterpillar

System OperationUse this procedure to troubleshoot any suspect problems with the following sensors:
Coolant temperature sensor
Intake manifold air temperature sensor
Fuel temperature sensorThe sensor signal for the passive sensor is routed from the ECM to terminal 1 of each sensor connector. The sensor return for the passive sensors is routed from the ECM to terminal 2 of each sensor connector.
Illustration 1 g01402850
Schematic for the passive analog sensors
Table 2
Troubleshooting Test Steps Values Results
1. Check for Active and Logged Diagnostic Codes
A. Remove electrical power from the ECM.
B. Connect Cat Electronic Technician (ET) to the service tool connector.
C. Restore electrical power to the ECM.
D. Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
E. Determine if a diagnostic code has occurred several times.
Note: A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a poor connection between a socket and a pin in a connector or of a poor connection between a wire and a terminal.
F. Determine if the problem is active and related to one of the following diagnostic codes:
-3
-4
G. Remove electrical power from the ECM.
Diagnostic Code
Result: A diagnostic code is not active.
Repair: The problem may be intermittent. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".
STOP
Result: An active -3 diagnostic code is present.
Proceed to Test Step 2.
Result: An active -4 diagnostic code is present.
Proceed to Test Step 4.
2. Check for Battery Voltage on the Signal Wire
A. Restore electrical power to the ECM.
B. Measure the voltage on the harness side of the sensor connector between pin 1 and engine ground for the suspect sensors.
C. Remove electrical power from the ECM.
Signal Voltage
Result: Remove electrical power from the ECM.
Result: The signal voltage is equal to battery voltage.
Repair: There is a short circuit to battery voltage in the harness. Repair the wiring harness or replace the wiring harness. Verify that the repair has resolved the original problem.
STOP
3. Create a Short Circuit at the Connector for the Suspect Sensor
A. Disconnect the suspect sensor.
B. Fabricate a jumper wire that is long enough to create a test circuit across the harness side of the sensor connector. Crimp connector pins to each end of the jumper wire.
C. Install the jumper wire between terminal 1 (sensor signal) and terminal 2 (sensor return) at the sensor connector.
D. Restore electrical power to the ECM.
E. Access the "Active Diagnostic Code" screen on Cat ET. Check for an active -4 diagnostic code for the suspect sensor.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
F. Remove electrical power from the ECM.
Diagnostic Code
Result: A -3 diagnostic code was active before creating the short at the sensor connector. A -4 diagnostic code became active after creating the short at the sensor connector. The wiring between the ECM and the sensor connector is OK.
Repair: Temporarily connect a new sensor to the harness, but do not install the new sensor in the