VALVE GP- 1945287 - Caterpillar

Illustration 8 g01446658
Terminal locations at the right rail connector that are for the electrical power supply
(Terminal 18) Keyswitch circuit
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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. Remove electrical power from the ECM.
B. Inspect the condition of fuse (1) and (2). Remove the fuses from the panel and check for a good connection. Thoroughly inspect connectors (2), (3), (4), (5), and (6). Inspect all of the other connectors that are in the circuit. 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 allen head screws in each of the ECM connectors, the machine interface connector, and the interface connector that is at the cab of the machine for the proper torque. Also, inspect all of the connectors on the machine that are associated with the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details that are related to the inspection of the electrical connectors.
E. Check the harness and the wiring for abrasion and for pinch points.
Damaged connectors or wiring
Results: The harness and wiring are OK.
Proceed to Test Step 2.
Results: There is a problem in the connectors and/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 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.
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.
Correct Voltage
Results: All of the voltage measurements are within the range that is specified.
Repair: The ECM is receiving the correct voltage. There may be an intermittent problem in a connector or in the harness wiring. If an intermittent condition is suspected,