Sensor Signal (Analog, Passive) - Test
Show/hide table
| Diagnostic Code | ||
|---|---|---|
| Code and Description | Default Conditions which Generate this Code | System Response |
| 102 -00 Boost Pressure Sensor : High | 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 |
| 102-01 Boost Pressure Sensor : Low | 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 |
| 102-03 Boost Pressure Sensor : Voltage Above Normal | 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 |
| 102-04 Boost Pressure Sensor : Voltage Below Normal | 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 |
Show/hide table
| |
| Illustration 1 | g03844552 |
Show/hide table
| Troubleshooting Test Steps | Value | Results |
|---|---|---|
1. Inspect Electrical Connectors and Wiring. A. Turn the engine control switch to the OFF position. B. Thoroughly inspect the J2/P2 connector, and the J8/P8 connector. Refer to Troubleshooting, "Electrical Connectors - Inspect". C. Perform a D. Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect". E. Check the harness for abrasions and for pinch points from the battery to the ECM. |
Electrical connectors and wiring |
Result : The electrical connectors and wiring are OK. Proceed to Test Step 2. Result : The electrical connectors and wiring are NOT OK. Repair : Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are coupled. If the problem is not resolved, proceed to Test Step 2. |
2. Check for Active Open or Short Diagnostic Codes. A. Connect Cat® Electronic Technician (ET) to the service tool connector. B. Turn the engine control switch to the ON position. C. Check for active diagnostic codes 102-03 or 102-04. |
Diagnostic codes |
Result : There are no diagnostic codes. Proceed to Test Step 3. Result : Diagnostic codes 102-03 or 102-04 is present. Repair : Refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test.". If the problem is not resolved, proceed to Test Step 3. |
3. Calibrate the Boost Sensor. A. Connect Cat ET to the Service Tool Connector. B. Turn the engine control switch to the ON position. C. Select the boost sensor calibration screen. D. The calibration will take several seconds. |
Boost sensor |
Result : The boost sensor is OK. Proceed to Test Step 4. Result : The boost sensor is NOT OK. Proceed to Test Step 5. |
4. Boost Pressure Sensor Test. A. Remove the sensor from the engine. B. Connect the FT-1906 Air Test Kit to the sensor. C. Connect to the service tool connector. D. Turn the engine control switch to the ON position. E. Close the valve on the test kit and apply F. Observe the display on Cat ET. Note : The leakage rate should not exceed |
Boost pressure sensor |
Result : The boost pressure sensor is OK. Repair : e boost sensor is working properly. For an intermittent problem, refer to Troubleshooting, "Electrical Connectors - Inspect". Result : The boost pressure sensor is NOT OK. Proceed to Test Step 5. |
5. Check Supply Voltage at the Sensor. A. Turn the engine control switch to the ON position. B. Measure the voltage between P8-A and P8-B. The voltage measures 5.0 ± 0.25 VDC. |
Supply voltage |
Result : The supply voltage is OK. Proceed to Test Step 7. Result : The supply voltage is NOT OK. Proceed to Test Step 6. |
6. Check Supply Voltage at the ECM. A. Turn the engine control switch to the ON position. B. Measure the voltage between P2-17 and P2-10. The voltage measures 5.0 ± 0.25 VDC. |
Supply voltage |
Result : The supply voltage is OK. Repair : The fault is in the wiring harness. Repair the harness or replace the harness. Result : The supply voltage is NOT OK. Repair : The fault is in the ECM. Replace the ECM. |
7. Check Signal Voltage at the Sensor. A. Turn the engine control switch to the ON position. B. Measure the voltage between P8-C and P8-B. The voltage measurement is between 0.4 VDC and 4.4 VDC. |
Signal voltage |
Result : The signal voltage is OK. Proceed to Test Step 8. Result : The signal voltage is NOT OK. Repair : Replace the sensor. If the problem is not resolved, proceed to Test Step 8. |
8. Check Signal Voltage at the ECM. A. Turn the engine control switch to the ON position. B. Measure the voltage between P2-30 and P2-10. The voltage measurement is between 0.4 VDC and 4.4 VDC. |
Signal voltage |
Result : The signal voltage is OK. Replace : Replace the ECM. Result : The signal voltage is NOT OK. Repair : The fault is in the wiring harness. Repair the harness or replace the harness. |
Caterpillar Information System:
G3600 A4 Engines Nitrogen Oxide Sensor - Calibrate
C15 Generator Set Electronic Modular Control Panel 4 (EMCP 4)
120 and 120 AWD Motor Grader Rollover Protective Structure (ROPS) - Inspect
120 and 120 AWD Motor Grader Secondary Steering - Test
120 and 120 AWD Motor Grader Tandem Breather - Clean/Replace
120 and 120 AWD Motor Grader Tandem Drive Oil Sample - Obtain
120 and 120 AWD Motor Grader Tandem Drive Oil Level - Check
3512C Generator Set Engine Water Pump - Assemble
120 and 120 AWD Motor Grader Tandem Drive Oil - Change
120 and 120 AWD Motor Grader Window Washer Reservoir - Fill
120 and 120 AWD Motor Grader Hydraulic System Oil Level - Check
120 and 120 AWD Motor Grader Fuel System Water Separator - Drain
3512C Generator Set Engine Auxiliary Water Pump - Remove and Install
G3516 TA Engine Test ECM Mode
C32 Marine Engines Electronic Control Module - Remove and Install - Hazardous Location
120 and 120 AWD Motor Grader Monitoring System
120 and 120 AWD Motor Grader Safety Messages
PM820, PM822, and PM825 Cold Planer Rotor Drive Clutch Bearings - Lubricate
C4.4 and C7.1 Engines Data Link Configuration Status - Test
G3606 and G3608 Engines Prelubrication Oil Pump - Remove
794 AC Off-Highway Truck Field Assembly Platform - Assemble
3512C Generator Set Engine Engine Oil Cooler - Remove and Install
794 AC Off-Highway Truck Field Assembly Stairway - Install
G3500H 50Hz Generator Sets Product Installation