5036055 JOHNSON SHAFT, CLAMP BRACKET

Illustration 1 g01204447
Schematic for the engine pressure sensors
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Illustration 2 g01204463
Sensor locations
(1) Intake manifold pressure sensor
(2) Atmospheric pressure sensor
(3) J2/P2 ECM connectors
(4) Engine oil pressure sensor
(5) Fuel pressure sensor
Thoroughly inspect connectors (3). Also, thoroughly inspect the connectors for sensors (1), (2), (4), and (5). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01204484
P2 ECM connector
(P2-15) Intake manifold pressure sensor
(P2-17) Sensor return
(P2-28) Engine oil pressure sensor
(P2-40) Fuel pressure sensor
(P2-57) Atmospheric pressure sensor
(P2-72) Sensor supply
Illustration 4 g01159881
Sensor connector
(A) Sensor supply
(B) Sensor return
(C) Sensor signal
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and on each of the wires in the pressure sensor connectors.
Check the allen head screw for each of the ECM connectors and the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasions and for pinch points from each of the pressure 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 harness and wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals for each of the connectors are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Supply Voltage at the Sensor Connector
Remove electrical power from the ECM.
Disconnect the harness connectors for the following sensors:
Atmospheric pressure sensor
Intake manifold pressure sensor
Engine oil pressure sensor
Fuel pressure sensor
Restore electrical power to the ECM. Note: The original diagnostic code may not stay active. An open circuit diagnostic code for the sensor supply may become active when all of the sensors are disconnected. Ignore the active codes at this time and continue with this test step.Note: Be sure to wiggle the harness during the following measurements in order to reveal an intermittent condition.
Measure the voltage between terminals A and B at each sensor connector on the engine harness.
Remove electrical power from the ECM.
Connect all of the sensors. Expected Result:Each voltage measurement is 5.0 0.2 VDC.Results:
OK - Each voltage measurement is 5.0 0.2 VDC. The voltage is correct at the sensor connectors. Proceed to Test Step 3.
Not OK - The voltage is not 5.0 0.2 VDC. Repair: The voltage is incorrect. There may be a problem with the sensor supply circuit. Refer to Troubleshooting, "5 Volt Engine Pressure Sensor Supply Circuit - Test" for information that is related to troubleshooting the circuit.STOPTest Step 3. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the ECM.
Monitor the active diagnostic code screen on Cat ET. Look for an active diagnostic code for an engine pressure sensor. Note: Wait at least 30 seconds so that any codes may become active.
Determine if the problem is related to an open circuit diagnostic code (03) or a short circuit diagnostic code (04). Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active for the engine pressure sensors.Repair: The problem seems to be resolved. The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A 03 diagnostic code is active at this time. The ECM is detecting an open circuit condition. Proceed to Test Step 5.
Not OK - A 04 diagnostic code is active at this time. The ECM is detecting a short circuit condition. Proceed to Test Step 4.Test Step 4. Disconnect the Suspect Sensor in Order to Create an Open Circuit
Remove electrical power from the ECM.
Disconnect the sensor connector of the sensor with the short circuit diagnostic code (04).
Restore electrical power to the ECM.
Access the "Active Diagnostic Code" screen on Cat ET. Check for an active open circuit diagnostic code (03) while the sensor is disconnected. Note: Wait at least 30 seconds for activation of the diagnostic codes.
Remove electrical power from the ECM. Expected Result:A 03 diagnostic code became active after the sensor was disconnected.Results:
OK - A 04 diagnostic code was active before the sensor was disconnected. A 03 diagnostic code became active after the sensor was disconnected.Repair: There may be a problem with a sensor. Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes.STOP
Not OK - When the sensor is disconnected, a 04 diagnostic code remains active for the suspect sensor. There is a problem