1556080 Volvo.Penta Rear section

Table 1
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Remove electrical power from the ECM.
B. Thoroughly inspect connectors (1), (2), and (3). Also, thoroughly inspect any of the other connectors that are associated with the lamp circuits. Refer to the Schematic of the engine for connector locations. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 45 N (10 lb) pull test on each of the wires for the lamp circuits.
D. heck the torque of the allen head screw on the ECM connectors and the customer connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
E. Check the harness and the wiring for abrasion and for pinch points from the dash display back to the ECM.
Connectors, Pins, and Sockets
Result: The harness and connectors appear to be in good repair. Proceed to Test Step 2.
Result: The connectors and/or wiring need 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 coupled. Verify that the repair eliminates the problem.
STOP
2. Check for Proper Operation of the Lamp Circuits
A. Connect Cat ET to the service tool connector.
B. Restore electrical power to the ECM. Turn the keyswitch to the ON position.
C. Select the "Override Parameters"option from the "Diagnostic Tests" on Cat ET.
D. Use the correct override parameter to power the circuit for the suspect lamp.
E. Remove electrical power from the ECM. Turn the keyswitch to the OFF position.
Lamp Circuits
Result: The suspect lamp illuminates when the override is on.
There does not appear to be a problem with the lamp circuit currently. The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring.
STOP
Result: The suspect lamp does not illuminate when the override is on. Inspect the lamp and the lamp socket for the suspect circuit. Use a lamp socket that is known to be operational to check the condition of the lamp, if necessary. If either of the components are questionable, replace the component. Retest the circuit. If the problem persists or if the components of the lamp assembly appear to be in good repair, proceed to Test Step 3.
3. Use the Override to Check the Wiring Harness
A. Remove the lamp for the suspect circuit from the lamp socket.
B. Connect a test lamp between the terminal of the lamp socket that is for the driver circuit from the ECM and the correct return for the circuit:
1. Connect a test lamp in the following manner if the lamp uses a high side driver as an output at the ECM:
a. Connect the test lamp between the terminal of the lamp socket that is for the driver circuit from the ECM and the −Battery terminal.
2. Connect a test lamp in the following manner if the lamp uses a low side driver as an output at the ECM:
a. Connect the test lamp between the terminal of the lamp socket that is for the driver circuit from the ECM and the "R" terminal of the keyswitch.
C. Restore electrical power to the ECM. Turn the keyswitch to the ON position.
D. Use the override parameter in Cat ET to power the circuit for the suspect lamp.
E. Remove electrical power from the ECM. Turn the keyswitch to the OFF position.
Test Lamp
Result: The test lamp illuminates when the override is turned on.
Check for continuity between the terminal for the return circuit of the lamp socket and the proper return that is for the suspect lamp:
1. Use this procedure for a lamp circuit that uses a high side driver as an output at the ECM:
a. Check for continuity in the wiring that is between the lamp socket and the −Battery.
b. If the circuit is continuous, then the lamp or the lamp socket is the cause of the problem. Replace the faulty lamp or the faulty lamp socket. Verify that the repair eliminates the original problem.
c. If the circuit is not continuous, then there is a problem in the wiring that is between the lamp socket and the −Battery. Repair the circuit. Verify that the repair eliminates the original problem.
2. Use this procedure for a lamp circuit that uses a low side driver as an output at the ECM:
a. Check for continuity in the wiring that is between the lamp socket and the "R" terminal of the keyswitch.
b. If the circuit is continuous, then the lamp or the lamp socket is the cause of the problem. Replace the faulty lamp or the faulty lamp socket. Verify that the repair eliminates the original problem.
c. If the circuit is not continuous, then there is a problem in the return circuit for the lamp. Repair the return circuit that is between the lamp socket and the "R" terminal of the keyswitch. Verify that the repair eliminates the original problem.
STOP
Result: The test lamp does not illuminate when the override is turned on.
There may be a problem in the keyswitch circuit. Verify that there is power at the "R" terminal of the keyswitch while the keyswitch is in the ON. If there is not power at "R" terminal of the keyswitch, then there is a problem with the keyswitch or the keyswitch circuit. Refer to Troubleshooting, "Electrical Power Supply - Test", for information that is related to troubleshooting the keyswitch circuit.
If there is power at the "R" terminal of the keyswitch, then there is a problem in the harness or in a connector that is between the ECM and the lamp socket. There may be a problem with the ECM. Proceed to Test Step 4.
4. Check for Proper Operation of the ECM
A. Ensure that electrical power has been removed from the ECM.
B. Disconnect the appropriate ECM connectors for the suspect lamp circuit.
C. Remove the signal wire for the suspect lamp from the ECM connector. Refer to Illustration 1 for the lamps correct terminal location.
D. Fabricate a jumper wire that is long enough to create a test circuit across the ECM connector. Crimp a connector socket to one end of the