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Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate This Code System Response
931-3
Engine Fuel Supply Pump Actuator : Voltage Above Normal The fuel priming pump is activated. The code is logged.
931-4
Engine Fuel Supply Pump Actuator : Voltage Below Normal The ECM detects a short circuit.
The fuel priming pump is NOT activated. The code is logged.
931-5
Engine Fuel Supply Pump Actuator : Current Below Normal The engine Electronic Control Module (ECM) detects an open circuit at the fuel pump relay for 60 seconds.
The ECM detects an open to battery voltage for the fuel pump relay.
The fuel priming pump is activated. The code is logged.
931-12
Engine Fuel Supply Pump Actuator : Failure The fuel priming pump is activated. The code is logged. The ECM is able to energize the fuel pump relay. The fuel pump relay controls battery power to the fuel priming pump. The circuit that is for battery power uses a 15 amp fuse for circuit protection. This circuit also provides battery power to the power module that is for the fuel control valve controller.
Illustration 1 g06174290
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the keyswitch to the OFF position.
B. Inspect the condition of relay . Remove the components from the panel and check for good connections. Thoroughly inspect connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Check the harness and the wiring for abrasion and for pinch points from the connectors for the electric fuel priming pump to the ECM.
Connectors and/or wiring
Results: The connectors and the wiring appear to be OK.
Proceed to Test Step 2.
Results: The connectors and/or the wiring are NOT OK.
Repair: Repair the connectors and/or the wiring. Replace parts, if necessary.
If the problem is not resolved, proceed to Test Step 2.
2. Check for Active Diagnostic Codes
A. Connect Cat®Electronic Technician (Cat ET) to the service tool connector.
B. Restore power to the ECM.
C. Turn the keyswitch to the ON position.
D. Select diagnostic tests from Cat ET.
E. Select the "Override Parameters" screen on Cat ET.
F. Activate the override for the fuel pump relay.
G. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
H. Deactivate the override for the fuel pump relay.
I. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Note: Wait at least 70 seconds in order for the diagnostic codes to become active.
Active Code
Results: No diagnostic codes are active, but a problem is suspected in the circuit for the fuel priming pump.
Proceed to Test Step 6.
Results: A -4 or -5 diagnostic code is active at this time.
Repair:
Proceed to Test Step 3.
Results: A -5 diagnostic code is active at this time.
Proceed to Test Step 4.
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 active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
J. Deactivate the override for the fuel pump relay.
K. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Note: Wait at least 70 seconds in order for the diagnostic codes to become active.
Fuel pump relay
Results: A -5 diagnostic code became active after disconnecting the connector for the fuel priming pump.
Repair: Temporarily install a new fuel pump relay. Verify that there are no active diagnostic codes for the fuel pump relay. Clear any logged diagnostic codes.
Results: A -6 diagnostic code remains active. There is a short between the connector for the fuel pump relay and the ECM.
Proceed to Test Step 5.
4. Create a Short 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 for the fuel pump relay. Install a jumper wire between the terminals at the connector for 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 active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic code to become active.
J. Deactivate the override for the fuel pump relay.
K. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Note: Wait at least 70 seconds in order for the diagnostic code to become active.
Fuel pump relay
Results: The engine harness and the ECM are OK.
Repair: Temporarily install a new fuel pump relay. Verify that there are no active diagnostic codes for the fuel pump relay. Clear any logged diagnostic codes.
Results: The -5 diagnostic code remains active with the jumper in place. Verify that the wire at terminal 85 of the connector that is in the fuse panel for the fuel pump relay has continuity to engine ground. If the ground circuit is OK, the open circuit is between the ECM and the connector for the fuel pump relay.
Proceed to Test Step 5.
5. Check the Operation of the ECM by Creating an Open at the ECM Connector
A. Remove power from the ECM.
B. Turn the keyswitch to the OFF position.
a. Disconnect the J1/P1 ECM connector.
b. Fabricate a jumper wire that is long enough to create a test circuit from the ECM connector to a good source of engine ground. Crimp a connector socket to one end of the jumper wire.
c. Remove the wire from terminal location P1-50 at the ECM connector for the fuel priming pump. Install the jumper wire into this terminal location.
Note: Ensure that the jumper wire does not come