C9.3 Engine for Wheel Tractor-Scrapers Caterpillar

Solenoid Valve - Test

Usage:

623H DBF

System Operation Description:

The Engine Control Module (ECM) monitors the current flow through the coils of the applicable components

The ECM sets a diagnostic trouble code if the current flow through a coil is incorrect. These codes can be activated only when the ECM is sending a command to the control valves. A -5 code indicates that the current flow through the circuit is low and there is an open in the circuit. A -6 code indicates that the current flow through the circuit is high and there is a short in the circuit.

Table 1 lists the diagnostic codes for incorrect current flow.

Note: Some of the following codes may not be applicable for certain applications.

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Table 1
Diagnostic Trouble Codes
CDL Code	Code Description	Comments
2232-5	Engine Retarder Solenoid : Current Below Normal	This code indicates there is a problem with the engine retarder solenoid and/or electrical circuit on the ECM.
2232-6	Engine Retarder Solenoid : Current Above Normal	This code indicates there is a problem with the engine retarder solenoid and/or electrical circuit on the ECM.
2461-5	ARD Fuel Pressure #1 Control : Current Below Normal	This code indicates there is a problem with the pilot fuel solenoid and/or electrical circuit on the CEM.
2461-6	ARD Fuel Pressure #1 Control : Current Above Normal	This code indicates there is a problem with the pilot fuel solenoid and/or electrical circuit on the CEM.
3391-5	ARD Fuel Pressure #2 Control Actuator : Current Below Normal	This code indicates there is a problem with the main fuel solenoid and/or electrical circuit on the CEM.
3391-6	ARD Fuel Pressure #2 Control Actuator : Current Above Normal	This code indicates there is a problem with the main fuel solenoid and/or electrical circuit on the CEM.
3405-5	EGR Valve Control : Current Below Normal	This code indicates there is an electrical problem with the solenoid valve and/or circuit on the NRS valve actuator
3405-6	EGR Valve Control : Current Above Normal	This code indicates there is an electrical problem with the solenoid valve and/or circuit on the NRS valve actuator.
3409-5	Engine Exhaust Manifold Bank #1 Flow Balance Valve Solenoid : Current Below Normal	This code indicates there is a problem with the exhaust balance valve solenoid and/or electrical circuit.
3409-6	Engine Exhaust Manifold Bank #1 Flow Balance Valve Solenoid : Current Above Normal	This code indicates there is a problem with the exhaust balance valve solenoid and/or electrical circuit.
3413-5	ARD Fuel Flow Diverter Actuator : Current Below Normal	This code indicates there is a problem with the solenoid on the diverter valve and/or the electrical circuit located on the ARD electric fuel pump.
3413-6	ARD Fuel Flow Diverter Actuator : Current Above Normal	This code indicates there is a problem with the solenoid on the diverter valve and/or the electrical circuit located on the ARD electric fuel pump.
3427-5	Aftertreatment Fuel Pump Relay : Current Below Normal	This code indicates there is problem with the relay and/or circuit for the ARD electric fuel pump.
3427-6	Aftertreatment Fuel Pump Relay : Current Above Normal	Indicates there is problem with the relay and/or circuit for the ARD electric fuel pump.
Follow the troubleshooting procedure in order to identify the root cause of the problem.

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)

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Table 2
Component	Electrical Checkout
Engine retarder solenoid	Engine Retarder Solenoid Override - initiate an engine retarder solenoid override through Cat ET in order to activate the engine retarder solenoid. Review active diagnostic codes to determine what code is present.
Pilot control solenoid	ARD ignition test - initiate an ARD ignition test through Cat ET in order to activate the pilot control valve solenoid. If the fault becomes active, the test will abort. Review active diagnostic codes to determine what code is present.
Main control solenoid	ARD ignition test - initiate an ARD ignition test through Cat ET in order to activate the main control valve solenoid. If the fault becomes active, the test will abort. Review active diagnostic codes to determine what code is present.
Solenoid valve for NRS valve actuator	EGR system test - initiate the EGR system test through Cat ET in order to activate the control solenoid for the NRS valve. If the fault becomes active, the test will abort. Review active diagnostic codes to determine what code is present.
Exhaust balance valve solenoid	Use the "Engine exhaust manifold bank #1 flow balance valve solenoid override" in the override parameters section in Cat ET to activate the exhaust balance valve solenoid. Review active diagnostic codes to determine what code is present.
Fuel diverter valve	Use the "ARD fuel flow diverter actuator override" in the override parameters section in Cat ET to activate the fuel diverter valve on the ARD fuel pump. Review active diagnostic codes to determine what code is present.
Relay for ARD fuel pump	Use the "Aftertreatment fuel pump relay override" in the override parameters section in Cat ET to activate the ARD fuel pump. Review active diagnostic codes to determine what code is present.
Relay for ARD heater	ARD Nozzle heater circuit test - Initiate the ARD Nozzle heater circuit test through Cat ET in order to activate the ARD heater relay. Review active diagnostic codes to determine if a code is present.

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Illustration 1	g02472016

Test Step 1. Determine the Diagnostic Code

Establish communication between Cat ET and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.

Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
Wait at least 30 seconds in order for the diagnostic codes to become active.

Look for these active codes or logged codes:
- -5
- -6

Results:

A -5 diagnostic code is active. - Proceed to Test Step 2.
A -6 diagnostic code is active. - Proceed to Test Step 3.

Test Step 2. Check the Wiring for an Open Circuit

Verify that the harness connector is free of debris, free of corrosion and securely connected.

Disconnect the solenoid from the engine harness.

Connect a jumper wire between the terminals of the harness connector for the suspect coil. The coil is replaced with a short circuit.

Clear the -5 code.

Perform the appropriate electrical checkout. Refer to Table 2.

Results:

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.
STOP
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.
STOP

Test Step 3. Check the Wiring for a Short Circuit

Disconnect the solenoid from the engine harness.

Clear the -6 code by cycling the keyswitch to the Off position.

Perform the appropriate electrical checkout. Refer to Table 2.

Results:

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.
STOP
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.
STOP