C32 Marine Engines Indicator Lamp Circuit - Test Caterpillar


Indicator Lamp Circuit - Test
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System Operation Description:

Use this procedure to troubleshoot any suspect problems with the following indicator lamps:

  • Low oil pressure lamp

  • High coolant temperature lamp

  • Low coolant level lamp

  • Maintenance indicator lamp

  • Diagnostic lamp

  • Warning lamp

The indicator lamps are activated by the Electronic Control Module (ECM) in order to inform the operator of various engine events.

The most likely cause of a problem with an indicator lamp is the bulb. The next most likely cause is a problem with a wire or with a connector. The least cause is a problem with the ECM.




Illustration 1g01130269

Schematic for the indicator lamps

Test Step 1. Inspect the Electrical Connectors and the Wiring

  1. Turn the keyswitch to the OFF position.



    Illustration 2g01130313

    Engine components that are associated with the indicator lamps

    (1) J61/P61 customer connectors

    (2) J1/P1 ECM connector

    (3) J69/P69 connector for the marine engine control panel (typical location)

  1. Thoroughly inspect connectors (1), (2), and (3). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.



    Illustration 3g01130795

    J61/P61 terminals that are associated with the indicator lamps

    (3) −Battery

    (8) +Battery

    (20) Low coolant level lamp

    (21) High coolant temperature lamp

    (22) Maintenance indicator lamp

    (23) Low oil pressure lamp

    (24) Diagnostic lamp

    (25) Warning lamp

    (30) Keyswitch




    Illustration 4g01130328

    P1 terminals that are associated with the indicator lamps

    (P1-19) Diagnostic lamp

    (P1-20) Warning lamp

    (P1-21) Maintenance indicator lamp

    (P1-28) Low oil pressure lamp

    (P1-29) High coolant temperature lamp

    (P1-30) Low coolant level lamp

    (P1-53) +Battery

    (P1-63) −Battery

    (P1-70) Keyswitch




    Illustration 5g01130801

    J69/P69 terminals that are associated with the indicator lamps

    (3) Keyswitch

    (4) Diagnostic lamp

    (5) Warning lamp

    (6) Maintenance indicator lamp

    (8) +Battery

    (10) −Battery

  1. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the indicator lamps.

  1. Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.

  1. Check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.

  1. Check the harness and wiring for abrasions and for pinch points from the indicator lamps to the ECM.

Expected Result:

All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.

Results:

  • OK - The connectors and wiring are OK. Proceed to Test Step 2.

  • Not OK - There is a problem in the connectors and/or wiring.

    Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.

    STOP

Test Step 2. Check for Normal Operation of the Indicator Lamps

  1. Turn the keyswitch to the ON position and monitor the indicator lamps.

Expected Result:

The indicator lamps turn on for five seconds. Then, the indicator lamps turn off.

Results:

  • OK - The indicator lamps turn on for five seconds. Then, the indicator lamps turn off.

    Repair: The problem appears to be resolved. The original problem was probably caused by a poor electrical connection. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".

    STOP

  • Not OK - An indicator lamp does not turn on. Proceed to Test Step 3.

Test Step 3. Measure the Voltage at the Lamp Socket

  1. Use a test lamp to check for voltage at the suspect lamp socket within the first five seconds after the keyswitch is turned ON.

Expected Result:

The test lamp illuminates during the first five seconds after the keyswitch is turned ON.

Results:

  • OK - The test lamp illuminates during the first five seconds after the keyswitch is turned ON.

    Repair: Replace the bulb.Verify that the repair eliminates the problem.

    STOP

  • Not OK - The test lamp did not illuminate during the first five seconds after the keyswitch was turned to the ON position. Proceed to Test Step 4.

Test Step 4. Test the Lamp Circuit

  1. Disconnect the J1/P1 connectors.

  1. Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch pin to both ends of the wire.

  1. Insert the ends of the jumper wire into the terminals that are appropriate for the indicator lamp. Refer to Table 1 for the appropriate terminals.

    Table 1
    P1 Terminals for the Connection of the Jumper Wire    
    Indicator Lamp     Terminals    
    Low coolant level     P1-30     P1-63    
    Low oil pressure     P1-28     P1-63    
    High coolant temperature     P1-29     P1-63    
    Maintenance indicator     P1-21     P1-70    
    Diagnostic lamp     P1-19     P1-70    
    Warning lamp     P1-20     P1-70    

  1. Turn the keyswitch to the ON position and observe the indicator lamp.

  1. Remove the jumper wire and observe the indicator lamp.

Expected Result:

The indicator lamp turns on while the jumper wire is connected to both terminals. The indicator lamp turns off when the jumper wire is removed.

Results:

  • OK - The indicator lamp turns on while the jumper wire is connected to both terminals. The indicator lamp turns off when the jumper wire is removed. The circuit for the indicator lamp is functioning properly.

    Repair: Perform the following procedure:

    1. Connect the J1/P1 connectors.

    1. Turn the keyswitch to the ON position and monitor the indicator lamps.

      The indicator lamps should turn on for five seconds. Then, the indicator lamps should turn off.

      If the indicator lamps turn on for five seconds, the problem is resolved. Return the engine to service. STOP.

    1. If the indicator lamps do not turn on for five seconds, there may be a problem with the ECM. It is unlikely that the ECM has failed. Exit this procedure and perform this entire procedure again.

      If the problem is still not resolved, temporarily connect a test ECM. Check the operation of the indicator lamps when the test ECM is installed. If the problem is resolved with the test ECM, then reconnect the suspect ECM. If the problem returns with the suspect ECM, then replace the ECM. Refer to Troubleshooting, "Replacing the ECM".

    STOP

  • Not OK - The indicator lamp does not turn on while the jumper wire is connected to both terminals. There is a problem in the wiring for the indicator lamp. There may be a problem in a connector.

    Repair: Repair the lamp circuit. Verify that the repair eliminates the problem.

    STOP

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