HOSE-AIR 2603527 - Caterpillar

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Terminal locations at the machine interface connector for the electrical power supply (Terminal 18) Keyswitch circuit (Terminal 39) +Battery (Terminal 40) +Battery
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Terminal locations at the connector for the fuel control valve that are for the electrical power supply (Terminal 8) Keyswitch circuit
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Terminal locations at the connector for the keyswitch that are for the electrical power supply (Terminal 1) Keyswitch circuit (Terminal 2) +Battery for the keyswitch circuit
Table 2
Troubleshooting Test Steps    Values    Results    
1. Inspect the Electrical Connectors and the Wiring
A. Turn the battery disconnect switch to the OFF position.
B. Thoroughly inspect connectors (26) through (30) and (33) through (37). Also, thoroughly inspect the connectors for relays (31) and (32). Inspect the wiring for the crossover harness that is in the control box for abrasion. Also check the condition of the circuit breakers in the low current and high current power distribution panels. Ensure that the breakers are in good repair and are not tripped. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the proper procedure for inspecting system wiring.
C. Perform a
45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
D. Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
E. Check the harness and the wiring for abrasion and for pinch points.
F. Check each of the fuses at the low current power distribution panel that are associated with the circuit. At the high current power distribution panel, ensure that the main circuit breaker has not been thrown.
Note: Replace any fuses that are blown. If necessary, reset the main circuit breaker.
   
Connectors    
Results: The harness and wiring are OK.
Proceed to Test Step 2
Results: There is a problem in the connectors and/or wiring.
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 coupled.
Verify that the repair eliminates the problem.
   
2. Check the Voltage at the Battery Post
A. Measure the voltage across the battery posts.
   
24 3 VDC.    
Results: The voltage is 24 3 VDC.
Proceed to Test Step 3
Results: The voltage is not 24 3 VDC.
Repair: There is a problem with the batteries or the charging system. Refer to Systems Operation/Testing and Adjusting for information that is related to troubleshooting the charging system.
Verify that the repair eliminates the problem.
   
3. Check the Voltage at the ECM Connector
A. Disconnect the J1/P1 ECM connectors.
B. Measure the voltage between P1-48 (unswitched +Battery) and P1-61 (−Battery).
C. Measure the voltage between P1-52 (unswitched +Battery) and P1-63 (−Battery).
D. Measure the voltage between P1-53 (unswitched +Battery) and P1-65 (−Battery).
E. Measure the voltage between P1-55 (unswitched +Battery) and P1-67 (−Battery).
F. Measure the voltage between P1-57 (unswitched +Battery) and P1-69 (−Battery).
G. Turn the keyswitch to the ON position.
H. Measure the voltage between P1-70 (keyswitch) and P1-69 (−Battery).
I. Turn the keyswitch to the OFF position.
   
ECM Connector    
Results: OK - All