Illustration 1 g01146754 Schematic for the digital sensor supply Illustration 2 g01121173 Left side view (1) P61 customer connector (2) J1/P1 ECM connectors Illustration 3 g01215738 P1 ECM connector (P1-4) +8 VDC (digital sensor supply) (P1-5) Return Illustration 4 g01119753 J61 and P61 customer connectors (8) +8 VDC (digital sensor supply) (9) Return Table 1 Troubleshooting Test Steps Values Results 1. Inspect the Electrical Connectors and the Wiring A. Turn the keyswitch to the OFF position. B. Thoroughly inspect connectors (1) and (2). Inspect the connectors for each digital sensor. 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 digital sensor supply. 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. E. Check the harness and wiring for abrasions and for pinch points from the battery to the ECM. Electrical Connectors and Wiring Results: The connectors and the wiring are OK. Proceed to Test Step 2. Results: There is a problem with a connector and/or the wiring. Repair: Repair the connector and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the problem is resolved. STOP 2. Check for Codes A. Connect the Cat® Electronic Technician (ET) to the service tool connector. B. Observe the active diagnostic code screen on Cat ET. Wait at least 15 seconds so that any codes may become active. Look for these codes: 041-03 8 Volt DC Supply short to +batt 041-04 8 Volt DC Supply short to ground Codes Results: A 041-03 diagnostic code is active. Proceed to Test Step 3. Results: A 041-04 diagnostic code is active. Proceed to Test Step 4. Results: None of the above codes are active. Repair: If any of the above codes are logged and the engine is not running properly, refer to Troubleshooting, "Troubleshooting Without a Diagnostic Code". STOP 3. Check the Voltage on the +8 V Supply Wire A. Turn the keyswitch to the OFF position. B. Disconnect the harness connectors for the engine coolant level sensor J800/P800. C. Turn the keyswitch to the ON position. D. Measure the voltage between terminals A and B at the harness connector for the sensor. 8.0 0.4 VDC Results: The voltage measurement is 8.0 0.4 VDC. Repair: Connect the sensor connectors. Clear all diagnostic codes. Check for active diagnostic codes. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect". STOP Results: The voltage measurement is not 8.0 0.4 VDC. There is a problem with the wiring or with the ECM. Proceed to Test Step 5. 4. Disconnect the +8 V Digital Sensor and Check for Active Diagnostic Codes A. Disconnect the Engine coolant level sensor. B. Wait for 15 seconds after you disconnect each sensor. Look for the active 041-04 diagnostic code to deactivate. 041-04 Code Results: The 041-04 diagnostic code deactivates when a particular sensor is disconnected. Repair: Connect the suspect sensor. If the diagnostic code returns, replace the sensor. Connect all of the connectors. Verify that the problem is resolved. STOP Results: The 041-04 diagnostic code remains after all of the sensors are disconnected. Leave
