YOKE AS 3732729 - Caterpillar

Illustration 1 g06103115
Schematic for the motorized valves
Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the connectors for the motorized valves. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the motorized valve wires in the ECM connector.
D. Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
E. Check the harness and wiring for abrasion and for pinch points from the motorized valves to the ECM.
Loose connection or damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wiring harness. Ensure that all the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points.
Proceed to Test Step 2.
2. Check for Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position.
D. Monitor the electronic service tool for active diagnostic codes and/or logged diagnostic codes.
Diagnostic codes
Result: A -3 or -5 diagnostic code is active or recently logged for one or more of the motorized valves.
Proceed to Test Step 4.
Result: A -6 diagnostic code is active or recently logged for one or more of the motorized valves.
Proceed to Test Step 6.
Result: A -7, (E1263 (2) or E1121 (2)) diagnostic code is active or recently logged for one or more of the motorized valves.
Proceed to Test Step 3.
Result: No diagnostic codes are active or logged.
Repair: For intermittent faults, refer to Troubleshooting, "Electrical Connectors - Inspect".
If no intermittent faults are found, return the unit to service.
3. Measure the Sensor Supply Voltage at the Valve Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect valve from the engine harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage at the harness connector for the valve from the 5 VDC supply terminal of the position sensor to the sensor ground terminal.
4.84 to 5.16 VDC
Result: The voltage from the terminal for the 5 VDC supply to the sensor common terminal measures 4.84 to 5.16 VDC.
Repair: Reconnect the suspect valve. Operate the engine for enough time to allow the engine to reach normal operating temperature. The suspect valve may be not responding due to frozen condensation.
Use the electronic service tool to run the "Air System Motor Valves Verification Test".
If the fault is cleared, return the engine to service.
If the -7, (E1263 (2) or E1121 (2)) code is still active, replace the suspect valve. Refer to Disassembly and Assembly for more information.
Use the electronic service tool to clear all logged diagnostic codes and then verify that the repair eliminates the