Manifold Absolute Pressure Sensor 2 - G429-, Checking
General Description
The Manifold Absolute Pressure Sensor 2 -G429- is located downstream of the throttle on the intake manifold, and measures the pressure and air temperature in the intake manifold and transmits the value to the Engine Control Module 2 -J624-.
The Engine/Motor Control Module -J623- uses the Manifold Absolute Pressure Sensor 2 -G429- signal to calculate a correction value for the charge air pressure. Evaluation of the signal gives consideration to the influence of temperature on the density of the charge air.
The Manifold Absolute Pressure Sensor 2 -G429- contains the following components:
- Intake Air Temperature Sensor 2 -G299-.
The Manifold Absolute Pressure Sensor 2 -G429- components cannot be serviced separately, it must be serviced as a unit.
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 automatic transmission, ensure the selector lever position is in "P".
- Vehicles with manual transmission, ensure the shifter lever position is in "N" with the parking brake applied.
- 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 concern. Refer to PRELIMINARY CHECK
.
-- Was Complaint verified? |
-- YES:
-- NO:
- GATHER more information from customer about the complaint.
|
| 2 |
- IGNITION: OFF.
- DISCONNECT: Manifold Absolute Pressure Sensor 2 -G429- harness connector.
- IGNITION: ON.
- CHECK: Manifold Absolute Pressure Sensor 2 -G429- harness connector terminals 2 to 3 for voltage.
- SPECIFIED VALUE: About 5.0 V.
- IGNITION: OFF.
-- Was Value obtained? |
-- YES:
-- NO:
|
| 3 |
- REMOVE: Engine/Motor Control Module -J623-. Refer to appropriate Service Information.
- CHECK: Manifold Absolute Pressure Sensor 2 -G429- harness connector terminal 1 to the Engine/Motor Control Module -J623- harness connector T56b / 11 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Was Value obtained? |
-- YES:
- REPLACE: Manifold Absolute Pressure Sensor 2 -G429-. Refer to appropriate Service Information.
- GO TO: Step 5.
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
- REPAIR: Faulty wiring or connector.
- GO TO: Step 5.
|
| 4 |
- REMOVE: Engine/Motor Control Module -J623-. Refer to appropriate Service Information.
- CHECK: Manifold Absolute Pressure Sensor 2 -G429- harness connector terminal 2 to the Engine/Motor Control Module -J623- harness connector T56b / 15 for resistance.
- CHECK: Manifold Absolute Pressure Sensor 2 -G429- harness connector terminal 3 to the Engine/Motor Control Module -J623- harness connector T56b / 7 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
-- YES:
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- CHECK: Wiring for open, high resistance, short or harness 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.
-- Does the original DTC return? |
-- YES:
- CHECK: Engine/Motor Control Module -J623- harness connector for any damaged, pushed-out pins.
- REPAIR: As necessary.
- If all electrical connections are OK:
- REPLACE: Engine/Motor Control Module -J623-. Refer to appropriate Service Information.
- Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
.
- Repair is complete. Generate Readiness Code. Refer to READINESS CODE
.
- Return vehicle to Customer.
-- NO:
- Perform the diagnostic procedure for any DTC's.
- If no DTC's return, the repair is complete.
- Return vehicle to customer.
|