FITTING-MALE- 4C3972 - Caterpillar

Implement ECM
Table 1
Implement ECM (MID 82)
DTC Code Description System Response
1529-3 Quick Coupler Switch : Voltage Above Normal Load sense solenoid is de-energized, the operator will not be able to change the work tool.
This code is triggered when both pins are open.
1529-4 Quick Coupler Switch : Voltage Below Normal Load sense solenoid is de-energized, the operator will not be able to change the work tool.
This code is triggered when both pins are grounded. Possible Causes for an FMI 3 Diagnostic code are:
Both signal contacts are shorted to battery.
The switch has failed.
The ECM has failed. A failure of the Implement ECM is unlikely.Possible Causes for an FMI 4 Diagnostic code are:
Both signal contacts are open.
The switch has failed.
The ECM has failed. A failure of the Implement ECM is unlikely.
Illustration 1 g06078763
Schematic for Operator Control Switch (Switch to Battery) Connections
Note: The diagram above is a simplified schematic of the ECM switch connections. The schematic is electrically correct, however, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR6723 for the complete schematic.
Table 2
Switch Operation For the Quick Coupler Switch (CID 1529)
Contacts Switch State Continuity
1, 2 Engage Yes
1, 2 Retract No
2, 3 Engage No
2, 3 Retract Yes Diagnostic Trouble Code Procedure
Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.
Table 3
Troubleshooting Test Steps Values Results
1. Identify Active FMI Code Associated With Sensor Circuit
Code present. FMI 3 diagnostic code, proceed to Test Step 2.
FMI 4 diagnostic code, proceed to Test Step 4.
Begin Process For FMI 3 Troubleshooting HERE
2. Check The Circuit For A Short
A. Turn the key start switch and disconnect switch OFF.
B. Disconnect the switch from the machine harness.
C. Disconnect the J1 and J2 machine harness connections from the Implement ECM.
C. At the machine harness connector for the ECM, one at a time, measure the resistance between each of the signal contacts to every other contact used in the J1 and J2 machine harness connectors.
The resistance is greater than 5 K Ω. OK - The resistance is correct.
Proceed to Test Step 3.
NOT OK - The resistance check is not correct.
Repair: There is a short in the signal circuits of the machine harness. Repair or replace the machine harness.
STOP
3. Check the Operation of the Switch.
A. The key start switch and disconnect switch remain OFF.
B. Reconnect all harness connectors.
C. Check the operation of the switch. Refer to the table for the suspected faulty switch at the beginning of this procedure for switch operation.
The switch operates correctly. OK - The switch is operating correctly.
Proceed to Test Step 9.
NOT OK - The switch is not