3R1-05116-0 Tohatsu STARTER SEALING PLATE

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Schematic for the Cat Data Link
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
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Location of the J1/P1 ECM connectors (typical engine view)
(1) J1/P1 ECM connectors
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Location of the engine interface connector and the service tool connector (typical engine view)
(2) Engine interface connector
(3) Service tool connector
Thoroughly inspect connectors (1), (2), and (3). Refer to Troubleshooting, "Electrical Connectors - Inspect".
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P1 terminals that are associated with the Cat Data Link
(P1-8) Cat Data Link +
(P1-9) Cat Data Link −
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Terminals at the engine interface connector that are associated with the Cat Data Link
(13) Cat Data Link +
(14) Cat Data Link −
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Terminals at the service tool connector that are associated with the Cat Data Link
(D) Cat Data Link +
(E) Cat Data Link −
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the Cat Data Link.
Check the allen head screw on each ECM connector for the proper torque. Also, check the allen head screw on the engine interface connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values. Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and the connectors appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or the wiring are not OK.Repair: Repair the connectors and/or the wiring. 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 original problem is resolved.STOPTest Step 2. Check the Data Link for a Short Circuit
Disconnect the J1 connector.
Disconnect Cat ET from the service tool connector.
Measure the resistance between the points that are listed in Table 1. Be sure to wiggle the wires in the harnesses as you make each resistance measurement.
Table 1
Resistance Measurements for the Cat Data Link
Connector and Terminal Terminal
P1-8 (Cat Data Link +) All of the other terminals on the P1 connector
Ground stud
P1-9 (Cat Data Link -) All of the other terminals on the P1 connector
Ground stud Expected Result:Each check of the resistance indicates an open circuit.Results:
OK - Each check of the resistance indicates an open circuit. The data link is not shorted to another wire in the harness. Proceed to Test Step 3.
Not OK - At least one check of the resistance does not indicate an open circuit.Repair: There is a short circuit in the harness or in a connector. Repair the connectors and/or the wiring. Replace parts, if necessary.STOPTest Step 3. Check for an Open Circuit
Fabricate a jumper wire that is long enough to short circuit two terminals at the service tool connector. Crimp connector sockets to each end of the jumper wire.
Install the jumper wire between terminals D (Cat Data Link +) and E (Cat Data Link −) at the service tool connector.
At the J1 ECM connector, measure the resistance between P1-8 (Cat Data Link +) and P1-9 (Cat Data Link −). Expected Result:The resistance check indicates that continuity exists for the circuit.Results:
OK - The resistance check indicates that continuity exists.Repair: Perform the following procedure:
Connect the J1/P1 connectors. Connect Cat ET to the service tool connector.
Check the Cat Data Link for proper operation. If the Data Link does not operate correctly, there may be a problem with the ECM. Replace the ECM. Refer to Troubleshooting, "Replacing the ECM" for information that is related to ECM replacement.STOP
Not OK - The resistance check did not indicate that continuity exists in the circuit. There is an open circuit or excessive resistance in the harness.Repair: There may be a problem with a connector. Repair the wiring and/or the connectors. Replace parts, if necessary.STOP