81674M Mariner TUBE, WATER (SHORT SHAFT)

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Schematic for the 8 volt supplyTest Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
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Typical left side engine view (1) J2/P2 ECM connector
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Typical component locations for the 8 volt supply (2) Coolant level sensor (optional) (3) Exhaust temperature sensor (optional)
Thoroughly inspect connector (1). Also, thoroughly inspect each connector for sensors (2) and (3). Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
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P2 terminals that are associated with the 8 volt supply (P2-92) Return (P2-29) +8 VDC
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Connector for the sensors (A) +8 VDC (B) Return (C) Signal
Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the digital sensor supply.
Check the allen head screw on each ECM connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Check the harness and wiring for abrasions and for pinch points from the sensor to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore the electrical power to the ECM.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:One of the following diagnostic codes is active:
263-03
263-04 Results:
OK - A 03 diagnostic code is active. Proceed to Test Step 3.
OK - A 04 diagnostic code is active. Proceed to Test Step 4.
Not OK - No diagnostic code for the digital supply is active. A problem is suspected with a sensor output signal. In order to verify that the sensor is receiving the correct supply voltage, proceed to Test Step 3.Test Step 3. Check the Voltage on the +8 V Supply Wire
Remove the electrical power from the ECM.
Disconnect the digital sensors from the sensor connectors.
Restore the electrical power to the ECM.
Measure the voltage between terminal A and terminal B at each sensor connector.Expected Result:The voltage is 8.0 0.4 VDC.Results:
OK - The voltage is 8.0 0.4 VDC.Repair: Reconnect the sensors. Clear all diagnostic codes. Check for active diagnostic codes. If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The voltage is not 8.0 0.4 VDC. Proceed to Test Step 5.Test Step 4. Disconnect the +8 V Sensors and Check for an Active Diagnostic Code
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Disconnect the digital sensors one at a time from the sensor connectors. Wait for 30 seconds after each sensor is disconnected. Check for an active diagnostic code on Cat ET.Expected Result:The 04 diagnostic code deactivates.Results:
OK - The 04 diagnostic code deactivates after a particular sensor is disconnected.Repair: Reconnect the sensor. If the problem returns after the reconnection of the sensor, disconnect the sensor. If the problem disappears after the disconnection of the sensor, replace the sensor. Clear all diagnostic codes. Verify that the repair eliminates the problem.STOP
Not OK - The 04 diagnostic code stays active. Leave the sensors disconnected. Proceed to Test Step 5.Test Step 5. Check the +8 V Supply Wire for a Short to Engine Ground or a Short to another Wire in the Harness
Remove the electrical power from the ECM.
Disconnect the J1/P1 ECM connector and the J2/P2 ECM connector.
Leave the digital sensors disconnected.Note: Wiggle the harness during the following measurements in order to reveal any intermittent short condition.
Measure the resistance between P2-29 (+8 V digital supply) and every terminal on ECM connector P1 and ECM connector P2.
Measure the resistance between P2-29 (+8 V digital supply) and engine ground.Expected Result:Each resistance measurement indicates an open circuit.Results:
OK - The resistance measurement does not indicate a short in the engine harness or a short to engine ground. Proceed to Test Step 6.
Not OK - A resistance measurement does not indicate an open circuit. The +8 V digital supply wire is shorted in the engine harness or the +8 V digital supply wire is shorted to engine ground.Repair: Repair the wire or replace the wire. Clear all logged diagnostic codes. Replace all wires to the original configuration. Verify that the repair eliminates the problem.STOPTest Step 6. Check the +8 V Supply and the Sensor Return for an Open Circuit
Install a wire jumper between pin P2-29 (+8 V digital supply) and pin P2-92 (digital return).Note: Wiggle the harness during the following measurements in order to reveal any intermittent short condition.
Measure the resistance between terminal A and terminal B at each of the sensor connectors.
Remove the wire jumper.Expected Result:The resistance is less than ten Ohms for each measurement.Results:
OK - The resistance check does not indicate an open circuit in the engine harness. Proceed to Test Step 7.
Not OK - A resistance measurem