Intake Manifold Sensor -GX9-, Checking
General Description
Intake manifold pressure and temperature are two factors used for engine load management. They measure the intake air temperature and the intake manifold pressure. The sender is located upstream of the Throttle Valve Control Module -J338- and contains the following senders:
- Intake Manifold Temperature Sensor -G72-.
- Charge Air Pressure Sensor -G31-.
They measure the pressure and temperature of the air in each bank. The values measured here correspond to the actual air mass in each bank.
Note the Intake Manifold Temperature Sensor -G72- / Charge Air Pressure Sensor -G31- is also known as the Intake Manifold Sensor -GX9-.
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
.
- For Hybrid vehicle's refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS
.
Test Procedure
| Step |
Procedure |
Result / Action to Take |
| 1 |
- PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK
.
-- Was Complaint verified? |
-- YES:
-- NO:
- GATHER more information from customer about the complaint.
|
| 2 |
- IGNITION: ON.
- DISCONNECT: Intake Manifold Sensor -GX9- harness connector.
- CHECK: Intake Manifold Sensor -GX9- harness connector terminals 2 to 4 for voltage.
- SPECIFIED VALUE: About 5.0 V.
- IGNITION: OFF.
-- Was Value obtained? |
-- YES:
-- NO:
|
| 3 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Intake Manifold Sensor -GX9- harness connector terminal 1 to the Engine Control Module - J623- harness connector T94 / 7 for resistance.
- CHECK: Intake Manifold Sensor -GX9- harness connector terminal 3 to the Engine Control Module - J623- harness connector T94 / 86 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Were Values obtained? |
-- YES:
- REPLACE: Intake Manifold Sensor -GX9-. Refer to appropriate repair 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 Control Module - J623-. Refer to appropriate repair information.
- CHECK: Intake Manifold Sensor -GX9- harness connector terminal 2 to the Engine Control Module - J623- harness connector T94 / 63 for resistance.
- CHECK: Intake Manifold Sensor -GX9- harness connector terminal 4 to the Engine Control Module - J623- harness connector T94 / 38 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 Control Module -J623- harness connector for any damaged, pushed-out pins.
- REPAIR: As necessary.
- 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.
- If all electrical connections are OK:
- REPLACE: Engine Control Module -J623-. Refer to appropriate repair information.
- 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.
|