1378955 Volvo.Penta Lock screw

Illustration 1 g01342245
Typical schematic
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P1 ECM connector (P1-34) CAN data link − (P1-42) Shield for the CAN data link (P1-50) CAN data link +
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Service tool connector (Terminal F) CAN data link + (Terminal G) CAN data link −
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Location of ECM connectorsTest Step 1. Inspect Electrical Connectors and Wiring
Turn the local/remote switch on the control panel to the OFF/RESET position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors in the circuit. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Inspecting Electrical Connectors" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points.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 - The connectors and/or wiring are not OK.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Verify the Proper Installation of the Terminating Resistors
Verify that the terminating resistors are installed on the ends of the data link.
Disconnect J1/P1 ECM connector and measure the resistance between P1-50 (CAN data link +) and P1-34 (CAN data link -).Expected Result:The resistance is approximately 60 3 Ohms.Results:
OK - The resistance is within the range. Proceed to Test Step 3.
Not OK - The resistance is approximately 120 6 Ohms. A terminating resistor is missing or damaged.Repair: If a termination resistor is missing, install the missing resistor. If both resistors are present, measure the resistance between pin A and pin B of the termination resistor. The resistance should measure 120 3 Ohms. Replace the termination resistor if the resistance is not 120 3 Ohms.Refer to the schematic in order to determine the missing resistor.Verify that the repair eliminates the problem.STOPTest Step 3. Check for a Short Circuit in the Harness
Disconnect the J1/P1 ECM connector.
Remove the terminating resistors from the harness for the CAN data link.
If a messenger module is installed, disconnect the messenger module.
Measure the resistance between the following pins.
P1-50 (CAN data link +) and +Battery
P1-34 (CAN data link -) and +Battery
P1-50 (CAN data link +) to P1-34 (CAN data link -)
P1-50 (CAN data link +) to P1-42 (CAN data link shield)
P1-34 (CAN data link -) to P1-42 (CAN data link shield)
P1-50 (CAN data link +) and the −Battery terminalExpected Result:The resistance indicates an open circuit.Results:
OK - The resistance indicates an open circuit. Proceed to Test Step 4.
Not OK - The resistance does not indicate an open circuit.Repair: There is a short in the harness wiring. Repair the connectors or wiring and/or replace the connectors or wiring.Verify that the repair eliminates the problem.STOPTest Step 4. Check for an Open Circuit in the Harness
All connections should remain disconnected.
Fabricate a jumper wire. Short pin F and pin G on the service tool connector.
Measure the resistance between P1-50 (CAN data link +) and P1-34 (CAN data link -) at the ECM connector P1.Expected Result:The resistance indicates a short circuit.Results:
OK - The resistance indicates a short circuit.Repair: The harness for the CAN data link is OK. There may be a problem in the modules that are connected to the CAN data link. Reconnect all connectors and modules to the CAN data link. Connect a spare module in place of one of the modules on the CAN data link. If the diagnostic code disappears, replace the module. If the diagnostic code does not disappear, install the original module. Repeat this step until the problem is found.STOP
Not OK - The resistance does not indicate a short circuit.Repair: There is an open in the harness wiring. Repair the connectors or wiring and/or replace the connectors or wiring. Make the necessary repairs.Verify that the repair eliminates the problem.STOP