C32 Tier 4 Final Marine Commercial Engines Caterpillar

Solenoid Valve - Test - Engine

Usage:

C32 MX4

Use this procedure to troubleshoot a problem with a solenoid valve. Also, use this procedure if one of the following diagnostic codes is active or easily repeated.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
677-5 Engine Starter Motor Relay : Current Below Normal	444-5 Starter Motor Relay : Current Below Normal	This code indicates that there is a problem with the engine starter motor relay and/or the electrical circuit on the ECM.
677-6 Engine Starter Motor Relay : Current Above Normal	444-6 Starter Motor Relay : Current Above Normal	This code indicates that there is a problem with the engine starter motor relay and/or the electrical circuit on the ECM.
4210-5 Engine Pre-lube Drive : Current Below Normal	338-5 Engine Pre-Lube Pump Relay : Current Below Normal	This code indicates that there is a problem with the prelubrication solenoid and/or the electrical circuit on the ECM.
4210-6 Engine Pre-lube Drive : Current Above Normal	338-6 Engine Pre-Lube Pump Relay : Current Above Normal	This code indicates that there is a problem with the prelubrication solenoid and/or the electrical circuit on the ECM.

Electrical Checkouts on the Cat^® Electronic Technician (ET)

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Table 2
Component	Electrical Checkout
Engine Starter Motor Relay	Attempt to start the engine. Once the ECM attempts to energize the solenoid, the code will become active. Refer to the application-specific schematic for the "Engine Starter Motor Relay" wiring circuit.
Prelubrication System Relay	Prelubrication Relay Override

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Table 3
Troubleshooting Test Steps	Values	Results
1. 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: A -5 code is active or logged. Proceed to Test Step 2. Result: A -6 code is active or logged. 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 relay from the harness. C. Connect a jumper wire between the terminals of the harness connector for the affected coil. The coil is replaced with a short circuit.	Create a Short	Result: A -5 code became active during the electrical checkout. The Electronic Control Module (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 or replace the connectors or the wiring. Verify that the repair eliminated the problem. Result: A -6 code is activated during the electrical checkout. The ECM detected the jumper wire. There is a problem with the solenoid. Repair: Replace the solenoid. Verify that the repair eliminated the problem.
3. Check the Wiring for a Short Circuit A. Disconnect the relay from the harness.	Create an Open	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 or replace the connectors or the wiring. Verify that the repair eliminated the problem. Result: A -5 code is activated during the electrical checkout. The ECM detected the open circuit. There is a problem with the solenoid. Repair: Replace the solenoid. Verify that the repair eliminated the problem.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).