0389106 JOHNSON LEAF PLATE ASSY, 85 hp

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Test Step 1. Check for Active +5 V Sensor Supply Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Verify that neither of the following diagnostic codes are active:
262-03
262-04Expected Result:Neither of the preceding diagnostic codes are active.Results:
OK - The diagnostic codes are not active. Proceed to Test Step 2.
Not OK - At least one of the diagnostic codes is active.Repair: Perform the following diagnostic procedure: Troubleshooting, "Analog Sensor Supply Circuit - Test".STOPTest Step 2. Verify all Active Diagnostic Codes
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Verify if any diagnostic codes are active:Expected Result:One or more diagnostic codes are active.Results:
OK - One or more of the diagnostic codes are active. Proceed to Test Step 3.
Not OK - None of the diagnostic codes are active.Repair: If the preceding codes are logged but not active and the engine is not running properly, refer to Troubleshooting, "Troubleshooting without a Diagnostic Code". If the engine is running properly at this time, an intermittent condition may be causing the logged codes. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOPTest Step 3. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Thoroughly inspect the J2/P2 ECM connector and the connectors for each pressure sensor. 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 and the sensor connectors that are associated with the active diagnostic code.
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 abrasions and for pinch points from the sensors back to the ECM.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 4.
Not OK - The connectors or wiring are damaged.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.Clear all logged diagnostic codes.STOPTest Step 4. Verify that a Diagnostic Code is Still Active
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Monitor the "Active Diagnostic Code " screen on the electronic service tool. Record any active diagnostic codes.
Determine if the problem is related to an open circuit diagnostic code or to a short circuit diagnostic code.Expected Result:Either a short circuit diagnostic code is active or an open circuit diagnostic code is active.Results:
SHORT Circuit - A short circuit diagnostic code is active at this time. Proceed to Test Step 5.
OPEN Circuit - An open circuit diagnostic code is active at this time. Proceed to Test Step 6.Test Step 5. Disconnect the Sensor in Order to Create an Open Circuit
Turn the keyswitch to the OFF position.
Disconnect the sensor connector of the sensor with the short circuit diagnostic code.
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Access the "Active Diagnostic Code" screen on the electronic service tool. Check for an active open circuit diagnostic code.Expected Result:An open circuit diagnostic code is now active for the disconnected sensor.Results:
OK - A short circuit diagnostic code was active before disconnecting the sensor. An open circuit diagnostic code became active after disconnecting the sensor. Proceed to Test Step 7.
Not OK - There is a short circuit between the sensor harness connector and the ECM. Leave the sensor disconnected. Proceed to Test Step 9.Test Step 6. Measure the Sensor Supply Voltage
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Terminals for pressure sensors
Turn the keyswitch to the OFF position.
Disconnect the sensor from the engine harness.
Turn the keyswitch to the ON position.
Measure the voltage from terminal "A" (Analog Sensor Power +5V) to terminal "B" (Analog Sensor Common) on the engine harness side of the connector.Expected Result:The voltage between terminal "A" and terminal "B" measures 5.0 0.2.Results:
OK - The sensor supply voltage is correct. Proceed to Test Step 8.
Not OK - The sensor supply voltage is out of the specified range.Repair: Proceed to the following procedure: Troubleshooting, "Analog Sensor Supply Circuit - Test"STOPTest Step 7. Determine if the Short Circuit is in the Connector or in the Sensor
Thoroughly inspect the connector for moisture.
Inspect the seals and reconnect the sensor.
If the short circuit diagnostic code reappears, the sensor or the pigtail harness connector is the problem.
Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine.
Check for a short circuit diagnostic code while the new sensor is connected to the harness.Expected Result:The short circuit diagnostic code is not present when a new sensor is connected.Results:
OK - The short circuit diagnostic code is not present when a new sensor is connected.Repair: Permanently install the new sensor. Clear the logged diagnostic codes.STOP
Not OK - The short circuit diagnostic code is present.Repair: Repair the engine harness connector. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOPTest Step 8. Create a Short Circuit Between the Signal and the Common Terminals at the Engine Harness Connector
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Terminals for pressure sensors
Turn the keyswitch to the OFF position.
Fabricate a jumper wire 150 mm