859312T 1 Mercury HARNESS ASSEMBLY, Engine Wiring

Table 1
Diagnostic Trouble Codes
CDL Code Code Description Comments
1779-5 Fuel Rail Pressure Valve Solenoid: Current Below Normal This code indicates that there is a problem with the fuel rail pressure control solenoid and/or electrical circuit in between the solenoid and engine ECM.
1779-6 Fuel Rail Pressure Valve Solenoid: Current Above Normal This code indicates that there is a problem with the fuel rail pressure control solenoid and/or electrical circuit in between the solenoid and engine ECM.
2417-5 Ether Injection Control Solenoid: Current Below Normal This code indicates that there is a problem with the ether control solenoid and/or electrical circuit in between the solenoid and engine ECM.
2417-6 Ether Injection Control Solenoid: Current Above Normal This code indicates that there is a problem with the ether control solenoid and/or electrical circuit in between the solenoid and engine ECM. Note: Refer to Troubleshooting, "Component Location" in this manual for the proper location of the components listed in this procedure.Electrical Checkouts on the Caterpillar Electronic Technician (ET)
Illustration 1 g03853624
Table 2
Troubleshooting Test Steps Values Results
1. Determine the Diagnostic Code
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Wait at least 30 seconds in order for the diagnostic codes to become active.
Look for an active -5 code or for a logged -6 code.
Diagnostic Trouble Codes
Result: There is an active or there is a logged -5 code.
Proceed to Test Step 2.
Result: There is an active or there is a logged -6 code.
Proceed to Test Step 3.
2. Check the Wiring for an Open Circuit
A. Verify that the harness connector is free of debris, free of corrosion and securely connected.
B. Disconnect the solenoid from the engine harness.
C. Connect a jumper wire between the terminals of the harness connector for the suspect coil. The coil is replaced with a short circuit.
D. Perform the appropriate electrical checkout.
Open Circuit
Result: A -5 code became active during the electrical checkout.
The ECM did not detect the jumper wire. There is an open circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair the appropriate harness wiring or replace the appropriate harness.
Verify that the problem is resolved.
Result: A -6 code is activated during the electrical checkout. The ECM detected the jumper wire. There is a problem with the solenoid. Clear the -6 code by cycling the keyswitch to the Off position.
Repair: Replace the solenoid.
Verify that the problem is resolved.
3. Check the Wiring for a Short Circuit
A. Disconnect the solenoid from the engine harness.
B. Clear the -6 code by cycling the keyswitch to the Off position.
C. Perform the appropriate electrical checkout.
Short Circuit
Result: A -6 code became active during the electrical checkout.
The ECM did not detect the open circuit. There is a short circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair the appropriate harness wiring or replace the appropriate harness.
Verify that the problem is resolved.
Result: A -5 code became active during the electrical checkout.
The ECM detected the open circuit. The wiring is OK. The coil has a short circuit.
Repair: Replace the solenoid. Verify that the problem is resolved.
Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).