7743130_008 Volvo.Penta cylinder head

Illustration 1 g01143077
Air inlet heater lamp on the engine control panelThe air inlet heater lamp is located on the engine control panel. The Electronic Control Module (ECM) provides 24 VDC to the lamp circuit. The air inlet heater lamp is used to indicate that the air inlet heater is on.The ECM momentarily illuminates the air inlet heater lamp after the ECM is powered up in order to run diagnostics on the lamp circuit. This also provides a visual check of the lamp's operation.Note: A air inlet heater lamp is also located in the cab. The indicator in the cab is activated by the tractor ECM. The tractor engine ECM illuminates the indicator in the cab when the ECM for the scraper engine sends data to the tractor engine ECM via the Cat Data Link. Use this procedure for the air inlet heater lamp on the scraper's engine control panel.
Illustration 2 g01190319
Schematic for the air inlet heater lampTest Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 3 g01142392
Left side view of the engine (1) J1/P1 ECM connectors
Thoroughly inspect connectors (1). Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 4 g01143110
P1 terminals that are associated with the air inlet heater lamp (P1-10) Air inlet heater lamp (P1-67) Return
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the air inlet heater lamp.
Check the torque of the allen head screws for the ECM connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points from the air inlet heater lamp back to the ECM.Expected Result:All of the connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary. 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.STOPTest Step 2. Check for Normal Operation of the Air Inlet Heater Lamp
Turn the battery disconnect switch for the scraper engine OFF.
Turn the keyswitch to the ON position.
Turn the battery disconnect switch for the scraper engine ON. Monitor the air inlet heater lamp on the engine control panel.Expected Result:The air inlet heater lamp turns on momentarily. Then, the lamp turns off.Results:
OK - The air inlet heater lamp turns on momentarily. Then, the lamp turns 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 - The air inlet heater lamp does not turn on. Proceed to Test Step 3.Test Step 3. Check for Voltage at the Lamp SocketUse a test lamp to check for voltage at the socket for the air inlet heater lamp within the first three seconds after the battery disconnect switch is turned ON.Expected Result:The test lamp illuminates momentarily after the battery disconnect switch is turned ON.Results:
OK - The test lamp illuminates momentarily after the battery disconnect switch is turned ON.Repair: Replace the bulb.Verify that the repair eliminates the problem.STOP
Not OK - The test lamp did not illuminate momentarily after the battery disconnect switch was turned ON. Proceed to Test Step 4.Test Step 4. Test the Lamp Circuit
Turn the battery disconnect switch OFF.
Disconnect the J1/P1 connectors.
Fabricate two jumper wires 100 mm (4 inch) long. Crimp a Deutsch pin to the end of each wire.
Insert the ends of a jumper wire into terminals P1-10 and P1-48. Insert the ends of the other jumper wire into terminals P1-63 and P1-67.
Turn the battery disconnect switch ON and observe the air inlet heater lamp.
Carefully remove a jumper wire and observe the air inlet heater lamp.Expected Result:The air inlet heater turns on while the jumper wires are connected. The air inlet heater lamp turns off when a jumper wire is removed.Results:
OK - The air inlet heater lamp turns on while the jumper wires are connected. The air inlet heater lamp turns off when the jumper wires are removed. The circuit for the air inlet heater lamp is functioning properly.Repair: Perform the following procedure:
Turn the battery disconnect switch OFF.
Remove the remaining jumper wire from the P1 connector.
Connect the J1/P1 connectors.
Turn the battery disconnect switch ON and monitor the air inlet heater lamp.The air inlet heater lamp should turn on momentarily. Then, the air inlet heater lamp should turn off.If the lamp turns on momentarily, the problem is resolved. Return the engine to service. STOP.
If the lamp does not turn on momentarily, 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 not resolved, temporarily connect a test ECM. Check the operation of the air inlet heater lamp when the test ECM is installed. If the problem is resolved with the test ECM, connect the suspect ECM. If the problem returns with the suspect ECM, replace the original ECM. Refer to Troubleshooting, "Replacing the ECM".STOP
Not OK - The air inlet heater lamp does not turn on while the jumper wires are connected. There is a problem in the wiring for the air inlet heater lamp. There may be a problem in a connector.Repair: Repair the lamp circuit. Verify that the repair eliminates the problem.STOP