SEAL KIT-PUMP 1948202 - Caterpillar

Table 1
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Remove electrical power from the ECM.
B. Thoroughly inspect the connector for sensor (4), ECM connectors (5) and (7), rail connector (6), and machine connector (8). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the coolant level sensor.
D. Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Electrical Connectors and the Wiring
Result: The harnesses and the wiring appear to be OK.
Proceed to Test Step 2.
Result: There is a problem with the connectors and/or the wiring.
Repair: The wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.
2. Check the Supply Voltage at the Sensor Connector
A. Disconnect the coolant level sensor at the sensor connector.
B. Restore electrical power to the ECM.
C. Measure the voltage between terminals A (digital supply) and B (digital return) at the harness connector for the coolant level sensor.
D. Remove electrical power from the ECM.
8.0 0.4 VDC
Result: The voltage measurement is 8.0 0.4 VDC.
The supply voltage is reaching the sensor.
Proceed to Test Step 3.
Result: The voltage measurement is not 8.0 0.4 VDC.
The digital sensor supply voltage is not reaching the sensor. There is a problem in the circuit for the digital sensor supply. Refer to Troubleshooting, "Sensor Supply - Test".
3. Disconnect the Coolant Level Sensor and Monitor the Status for "Coolant Level"
A. Disconnect the harness connector for the coolant level sensor.
B. Restore electrical power to the ECM.
C. Monitor the status of "Coolant Level" on Cat ET.
Wait at least 30 seconds for activation of the status indicator.
D. Remove electrical power from the ECM.
Sensor reading
Result: The status is "LOW" when the sensor is disconnected.
There may be a problem with the coolant level sensor.
Proceed to Test Step 4.
Result: The status is "OK" when the sensor is disconnected.
The problem is between the ECM and the harness connector. There may be a problem with the ECM.
Proceed to Test Step 5.
4. Short the Signal Wire to Ground and Monitor the Status for "Coolant Level"
A. Remove electrical power from the ECM.
B. Fabricate a jumper wire that is long enough to create a short circuit between two terminals at the coolant level sensor harness connector. Crimp connector pins to each end of the jumper wire.
C. Install the jumper wire between terminals B (digital return) and C (sensor signal) on the harness side of the connector for the coolant level sensor.
D. Restore electrical power to the ECM.
E. Monitor the status of "Coolant Level" on Cat ET while the jumper wire is installed.
Wait at least 30 seconds for activation of the status indicator.
F. Remove electrical power from the ECM.
G. Remove the jumper wire. Connect the harness connector for the coolant level sensor.
Short circuit
Result: The status changes from "LOW" to "OK"