SEAL-O-RING 3P0653 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) monitors the inlet manifold pressure with a sensor. The sensor is located at the front of the engine. A voltage of +5 VDC is supplied to the inlet manifold pressure sensor. The sensor provides a output voltage of 0.4 VDC to 4.4 VDC. This voltage is proportional to the operating pressure range of 0 kPa (0 psi) to 690 kPa (100 psi).The ECM uses information from the boost pressure sensor to reduce smoke emissions during acceleration. When the ECM senses a higher inlet manifold pressure, the rack limit is increased in order to allow more fuel.The boost pressure sensor must be calibrated while the engine is off. Calibration is accomplished electronically without the need for manual adjustments. Use Caterpillar Electronic Technician (ET) to recalibrate the sensor. Recalibrate the sensor whenever the ECM or the sensor has been replaced.
Illustration 1 g01635994
Illustration 2 g01636024
(25) Boost pressure (30) + 5 VDC (35) Analog return
Table 1
Diagnostic Code    
Code and Description    Flash Code    Default Conditions which Generate this Code    System Response    
102 -00 Boost Pressure Sensor : High     25     The boost pressure signal voltage is valid, but above normal.     The diagnostic code is logged. Also, the engine power is limited. boost pressure is set to
600 kPa (87 psi).    
102-01 Boost Pressure Sensor : Low     25     The boost pressure signal voltage is valid, but below normal.     The diagnostic code is logged. Also, the engine power is limited. boost pressure is set to
600 kPa (87 psi).    
102-03 Boost Pressure Sensor : Voltage Above Normal     25     The boost pressure signal voltage is greater than 5.0 VDC.     The diagnostic code is logged. Also, the engine power is limited. boost pressure is set to
600 kPa (87 psi).    
102-04 Boost Pressure Sensor : Voltage Below Normal     25     The boost pressure signal voltage is less than 0.75 VDC.     The diagnostic code is logged. Also, the engine power is limited. boost pressure is set to
600 kPa (87 psi).    
102-13 Boost Pressure Sensor : Calibration Required     42     The boost pressure sensor is not calibrated.     The fault is active and the ECM converts to low power. Also, boost pressure is set to
0 kPa (0 psi).    Test Step 1. Inspect Electrical Connectors and Wiring
Turn the engine control switch to the OFF position.
Thoroughly inspect the J14/P14 connector, and the J8/P8 connector. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the inlet manifold pressure sensor.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Check the harness for abrasions and for pinch points from the battery to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled