CAP-FILLER 3764061 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the system if any of the following diagnostic codes are active or easily repeated:
212-03 5 Volt Sensor Supply #1 voltage high
212-04 5 Volt Sensor Supply #1 voltage low
232-03 5 Volt Supply voltage high
232-04 5 Volt Supply voltage lowAlso, use this procedure to troubleshoot the system when you have been directed here by another troubleshooting procedure.The following background information is related to this procedure:The Engine Control Module (ECM) supplies the following sensors with regulated 5 VDC:
Atmospheric pressure sensor
Intake manifold pressure (Boost)
Engine oil pressure sensor
Pressure sensor for the intake valve actuation pressureThe 5 volt sensor supply provides power to all 5 volt sensors. The ECM supplies 5.0 0.16 VDC to terminal A of each sensor connector. The sensor common from the ECM connector goes to terminal B of each sensor connector. The sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the ECM.Note: The sensors are not protected from overvoltage. A short from the supply line to the +Battery may damage the sensors. If the -03 code is logged, it is possible that all of the sensors have been damaged. Repair the sensor supply and check for any "ACTIVE" sensor diagnostic codes in order to determine if a sensor has failed.
Illustration 1 g01098596
Illustration 2 g01098563
P2 ECM connector (P2-15) Signal for the intake manifold pressure (Boost) (P2-17) Sensor common (P2-28) Signal for the engine oil pressure (P2-54) Pressure sensor common (actuator) (P2-57) Signal for the atmospheric pressure (P2-72) +5 Volt sensor supply (P2-74) Signal for the intake valve actuation pressure (P2-80) +5 Volt sensor supply (actuator)
Illustration 3 g01103785
Sensor locations on the left side (1) Intake manifold pressure sensor (Boost) (2) Atmospheric pressure sensor (3) Engine oil pressure sensor
Illustration 4 g01103786
Sensor locations on the right side (4) Pressure sensor for the intake valve actuator
Illustration 5 g01094844
Sensor connectorTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Thoroughly inspect the J1/P1 ECM connector and the J2/P2 ECM connector. Inspect all of the connectors that are associated with the circuit.Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the harness and wiring for abrasion and for pinch points from the sensors back 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 - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or wiring.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 Active Diagnostic Codes
Connect the Caterpillar