Charge Air Pressure Sensor -G31- /Intake Air Temperature Sensor -G42-, CHECKING
Function
The Charge Air Pressure Sensor -G31- and Intake Air Temperature Sensor -G42- are integrated into one component. They are located in the induction pipe between the charge air cooler and the Throttle Valve Control Module -J338-. The air pressure in the intake manifold is determined from the Charge Air Pressure Sensor -G31- signal. Engine Control Module -J623- needs the signal to control the boost pressure.
The Engine Control Module -J623- uses the signal of Intake Air Temperature Sensor -G42- to control the boost pressure. Because the temperature influences the density of the charge air, the signal is used by Engine Control Module -J623- as a correction value.
Special tools and workshop equipment required
- Multimeter
- Wiring Diagram
- Scan Tool
Test Requirements
- Fuses OK.
- Battery voltage OK
- Switch OFF all electrical and electronic accessories.
- Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
- Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
- Coolant Temperature: ≥ 80 °C.
- Observe all safety precautions: SAFETY PRECAUTIONS
- View clean working conditions: CLEAN WORKING CONDITIONS
Test Procedure
| Step |
Procedure |
Result / Action to Take |
| 1 |
- PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK
-- Was complaint verified? |
- NO:
- Gather more Information from customer about the complaint
|
| 2 |
- IGNITION: ON
- DISCONNECT: Intake Air Temperature Sensor -G42- / Charge Air Pressure Sensor -G31- electrical connector
- CHECK: Intake Air Temperature Sensor -G42- / Charge Air Pressure Sensor -G31- wiring connector terminals 1 to 3 for voltage
- SPECIFIED VALUE: About 5.0 V
- IGNITION: OFF
-- Was value obtained? |
|
| 3 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate service manual.
- CHECK: Intake Air Temperature Sensor -G42- / Charge Air Pressure Sensor -G31- electrical connector terminals 2 to the Engine Control Module - J623- electrical connector terminals T105 / 97.
- CHECK: Intake Air Temperature Sensor -G42- / Charge Air Pressure Sensor -G31- electrical connector terminals 4 to the Engine Control Module - J623- electrical connector terminals T105 / 98.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Was value obtained? |
- YES:
- REPLACE: Intake Air Temperature Sensor -G42- / Charge Air Pressure Sensor -G31-. Refer to appropriate repair manual.
- GO TO: Step 5
- NO:
- CHECK: wiring for open, high resistance, short or electrical connector for damage, corrosion, loose or broken terminals
- REPAIR: faulty wiring or connector
- GO TO: Step 5
|
| 4 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate service manual.
- CHECK: Intake Air Temperature Sensor -G42- / Charge Air Pressure Sensor -G31- electrical connector terminals 1 to the Engine Control Module - J623- electrical connector terminals T105 / 77.
- CHECK: Intake Air Temperature Sensor -G42- / Charge Air Pressure Sensor -G31- electrical connector terminals 3 to the Engine Control Module - J623- electrical connector terminals T105 / 56.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Was value obtained? |
- YES:
- REPLACE Engine Control Module -J623- Refer to appropriate repair manual
- GO TO: Step 5
- NO:
- CHECK: wiring for open, high resistance, short or electrical connector for damage, corrosion, loose or broken terminals
- REPAIR: faulty wiring or connector
- GO TO: Step 5
|
| 5 |
- Final Procedure
- Perform a road test to verify repair.
- Do any DTC's return:
|
- NO:
- Repair is complete, Generate readiness code. Refer to READINESS CODE .
- Return vehicle to Customer
|