3C8B02020-0 Tohatsu INLET MANIFOLD

Illustration 1 g00836031
Circuit schematic for the change oil lamp
Test Step 1. Inspect Electrical Connectors and Wiring
Illustration 2 g01150919
Pin locations on ECM connector
(P1-30) Change oil lamp
Thoroughly inspect ECM vehicle harness connector J1/P1, the firewall bulkhead connector, and the terminals for the change oil lamp. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the change oil lamp.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and for pinch points from the sensor to the ECM. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - 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.STOPTest Step 2. Check for Normal Operation of the Change Oil Lamp
Monitor the change oil lamp. Turn the ignition key switch to the ON position, while the engine is off. The lamp should turn on for five seconds. Then, the lamp should turn off. Expected Result:The change oil lamp turns on and the change oil lamp turns off per the description above.Results:
Yes - The change oil lamp is operating normally.STOP
No - The lamp does not turn on. Proceed to Test Step 3.Test Step 3. Test the Change Oil Lamp Circuit
Illustration 3 g01150923
Pin locations on ECM Connector
(P1-30) Change oil lamp
(P1-65) - Battery
Turn the ignition key switch to the OFF/RESET position.
Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch pin to both ends of the wires.
Disconnect vehicle harness connector P1 from the ECM.
Insert the jumper into P1-30 change oil lamp.
Connect the other end of the jumper wire to P1-65 (−Battery).
Turn the ignition key switch to the ON position.
While the lamp is being watched, insert the jumper wire and remove the jumper wire. Expected Result:Result 1 The change oil lamp turns on while the jumper is connected to both sockets. Also, the change oil lamp turns off when the jumper is removed from one of the sockets.Result 2 The change oil lamp does not turn on while the jumper is connected to both sockets.Result 3 The change oil lamp will stay on while the ECM vehicle harness connector is disconnected.Results:
Result 1 - The change oil lamp is functioning properly. Proceed to Test Step 4.
Result 2 - The change oil lamp did not turn on. The vehicle's lamp circuit is not functioning properly. The lamp is probably burned out or there is a problem in the wiring from the cab to either the ECM or the +Battery connection. Repair the lamp circuit or send the vehicle to the OEM dealer for repairs.STOP
Result 3 - Repair: Perform the following diagnostic procedure:The circuit between the ECM and the lamp is shorted to chassis ground. Repair the circuit or send the vehicle to the OEM dealer for repairs.STOPTest Step 4. Check the Operation of the ECM Output for the Change Oil Lamp
Illustration 4 g01150927
Pin locations on breakout T
(P1-30) Change oil lamp
(P1-52) Unswitched + battery
(P1-65) - Battery
Disconnect ECM vehicle harness connector J1/P1.
Insert a breakout T between ECM vehicle harness connector J1 and ECM vehicle harness connector P1.
Connect one probe of the voltage test lamp to J1/P1-65 (-battery). Connect the other probe of the voltage test lamp to J1/P1-52 (unswitched +Battery) of the breakout T.
The test lamp should turn on. If the test lamp does not turn on, either the test lamp is faulty or the wiring to the ECM is faulty. Continue with this step if the lamp turns on.
Leave the probe of the test lamp connected to J1/P2-52 (unswitched +Battery).
Connect the other probe of the test lamp to J1/P1-30 (change oil lamp) on the breakout T. Refer to Illustration 4.
Connect Caterpillar Electronic Technician (ET). Access the following display screens in order:
"Diagnostics"
"Diagnostic Test"
"Special Test"
Activate the "Change Oil Lamp" test. Observe the voltage test lamp. The lamp should turn on when the test is active. Also, the lamp should turn off when the test is inactive. Expected Result:The test lamp turns on and the test lamp turns off per the above description.Results:
Yes - The ECM is operating correctly. There is a problem in the vehicle wiring or the lamp.STOP
No - Repair: Temporarily connect a test ECM. Check the output circuit of the ECM that supplies power to the change oil lamp when the test ECM is installed. If the problem is resolved with the test ECM, reconnect the suspect ECM. If the problem returns with the suspect ECM, replace the ECM.STOP