Use this procedure if another test procedure has directed you here. Also use this procedure when there is an active fault for the current consumption on the glow plug start aid relay.
Use this procedure for the following diagnostic codes:
- 2246-06 Glow Plug Start Aid Relay Current Above Normal
The following background information is related to this procedure:
The starting aid is used to improve the engine starting when the engine is cold. When the "RUN" push button on the EMCP3 control panel is pressed, the control panel will activate the starting aid relay for a controlled period of time. While the glow plug start aid relay is activated the glow plug start aid relay will provide power to the glow plugs.
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| Illustration 1 | g01641133 |
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Schematic for the starting aid | |
Test Step 1. Inspect Electrical Connectors and Wiring
- Inspect the following connectors:
- EMCP3 connector
- Con 1 connector on the Engine Interface Module
- Inspect the terminal connections on the glow plug start aid relay. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
- Perform a
45 N (10 lb) pull test on each of the wires in the connectors that are associated with the glow plug starting aid. - Check the harness for abrasion and pinch points from the glow plugs back to the control panel.
- Check that the fuses are not blown.
Expected Result:
All connectors, pins and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion and pinch points. The fuses are not blown.
Results:
- OK - The harness and the connectors appear to be OK. Proceed to Test Step 2.
- Not OK - There is a fault with the harness and connectors.
Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled. Replace blown fuses.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair has eliminated the fault.
STOP
Test Step 2. Check for Active Diagnostic Codes
- Connect the electronic service tool to the diagnostic connector.
- Install a wire between terminal 7 and terminal 3B in the box for the control panel.
Note: The engine has not been started at this Test Step.
- Use the electronic service tool to select the "Glow Plug Start Aid Override Test" in order to turn on the power for the glow plugs.
- Check for active diagnostic codes or recently logged diagnostic codes.
Expected Result:
The following diagnostic code is active or recently logged:
- 2246-06 Glow Plug Start Aid Relay Current Above Normal
Results:
- OK - The expected diagnostic code is active or recently logged. Proceed to Test step 3.
- Not OK - An active diagnostic code or a recently logged diagnostic code was not displayed.
Repair: Perform one of the following procedures:
- If an intermittent fault is suspected, use the electronic service tool to perform a "Wiggle Test" in order to locate intermittent connections.
- If there is a fault in a glow plug or a fault on the starting aid and a diagnostic code is not displayed then there may be a fault with the power circuit for the glow plugs or there may be an open circuit in the solenoid for the glow plug relay. The control panel does not monitor the status of these tests. Refer to Testing and Adjusting, "Glow Plugs - Test".
STOP
Test Step 3. Check the Wiring for a Short Circuit
- Remove the temporary wire that was installed between terminal 7 and terminal 3B in the box for the control panel.
- Remove the connector from the EMCP3 control panel.
- Check the connector, pins and the sockets for corrosion or damage.
- Check the resistance between pin35 and each of the pins on the P1 connector.
- Reconnect the connector to the EMCP3 control panel.
Expected Result:
The resistance between pin 35 and each of the pins on the P1 connector is more than 10,000 Ohms.
Results:
- OK - There are no shorts in the harness that connects the control panel to the engine interface module. The engine interface module, the relay for the glow plugs or the associated wiring is suspect. Proceed to Test Step 4.
- Not OK - The harness is faulty.
Repair: If the resistance between pin 35 and each of the other pins on the connector is less than 10,000 Ohms then there is a short circuit or high resistance in the connection to another wire. Locate the open circuit, the short circuit or high resistance in the connection in the harness. Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly coupled. Replace any fuses that may be open circuit.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair has eliminated the fault.
If the fault still exists, proceed to Test Step 4.
Test Step 4. Check the Operation of the Engine Interface Module
- Disconnect the connection from test point "C" on the glow plug start aid relay.
- Connect the electronic service tool to the diagnostic connector.
- Install a wire between terminal 7 and terminal 3B in the box for the control panel.
Note: The engine has not been started at this Test Step.
- Connect a suitable multimeter between the wire that was disconnected from test point "C" on the glow plug start aid relay and ground.
- Use the electronic service tool in order to operate the glow plugs.
- Measure the voltage on the multimeter. The voltage should be a constant 10.5 to 13.5 Volts DC.
- Use the multimeter in order to measure the voltage from the battery ground and terminal "B" on the glow plug start aid relay.
- Stop the glow plug test on the electronic service tool.
- Remove the temporary wire that was installed between terminal 7 and terminal 3B in the box for the control panel.
- Remove the multimeter and then reconnect the wire to test point "C" on the glow plug start aid relay.
Expected Result:
The measured voltage is a constant 10.5 to 13.5 Volts DC.
Results:
- OK - The engine interface module is operating correctly and the wiring between the engine interface module and the glow plug start aid relay is not faulty.
Repair: The wiring between the glow plug start aid relay and the glow plugs may be faulty. Check the wiring for faults and repair the wiring.
The glow plug start aid relay may be faulty. Replace the glow plug start aid relay.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.
STOP
- Not OK - There may be a fault in the wiring between the engine interface module and the glow plug start aid relay.
Repair: Check the wiring for faults and repair the wiring.
STOP
- Not OK - The engine interface module may be faulty.
Repair: Replace the engine interface module. Refer to the documentation for the engine interface module.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.
STOP