AXLE AS 8W6477 - Caterpillar

Illustration 1 g02301755
Typical schematic for the fuel priming pump
Illustration 2 g01210818
Terminal locations at the fuel priming pump relay
(Terminal 1) Keyswitch Power
(Terminal 2) Return
(Terminal 3) Control circuit from the ECM
(Terminal 5) Power to the fuel priming pump
Illustration 3 g01155187
Terminal locations at the connector for the fuel priming pump
(Terminal 1) Power to the fuel priming pump
(Terminal 2) Return
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the connectors. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.
C. Perform a 45 N (10 lb) pull test on the connector wires.
D. Check the harness for abrasions and pinch points.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Proceed to Test Step .
Result: There is a problem with the connectors and/or wiring.
Repair: Repair or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are coupled.
If the problem is not resolved, proceed to Test Step 2.
2. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: No diagnostic codes are active, but a problem is suspected in the circuit for the fuel priming pump.
Proceed to Test Step 6.
Result: A -5 diagnostic code is active at this time.
Proceed to Test Step 4.
Result: A -6 diagnostic code is active at this time.
Proceed to Test Step 3.
3. Create an Open at the Connector for the Fuel Pump Relay
A. Remove power from the ECM.
B. Turn the keyswitch to the OFF position.
C. Disconnect the connector from the fuel pump relay.
D. Restore power to the ECM.
E. Turn the keyswitch to the ON position.
F. Select diagnostic tests from Cat ET.
G. Select the "Override Parameters" screen on Cat ET.
H. Activate the override for the fuel pump relay.
I. Monitor the