Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, Checking

General Description

This sensor detects an intake manifold air pressure controller failure during naturally aspirated operation and supercharged operation. monitor validates the consistency between the pressure quotient setpoint value at supercharger and the actual pressure quotient value at supercharger. If the difference exceeds a threshold, a failure is detected.

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.
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?	-- YES: GO TO: Step 2 Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	DISCONNECT: Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- harness connector. IGNITION: ON. CHECK: Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- harness connector terminals 1 to 3 for voltage. IGNITION: OFF. SPECIFIED VALUE: About 5.0 V. -- Was Value obtained?	-- YES: GO TO: Step 3 Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, CHECKING - 3 . -- NO: GO TO: Step 4 Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, CHECKING - 4 .
3	REMOVE: Engine Control Module - J623-. Refer to the appropriate service information. CHECK: Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- harness connector terminal 2 to the Engine Control Module - J623- harness connector T60 / 41 for resistance. CHECK: Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- harness connector terminal 4 to the Engine Control Module - J623- harness connector T60 / 37 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-. Refer to the appropriate service information. GO TO: Step 5 Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, CHECKING - 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 Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, CHECKING - 5 .
4	REMOVE: Engine Control Module - J623-. Refer to the appropriate service information. CHECK: Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / 50 for resistance. CHECK: Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42- harness connector terminal 3 to the Engine Control Module - J623- harness connector T60 / 35 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: GO TO: Step 5 Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, CHECKING - 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 Manifold Absolute Pressure Sensor -G71- / Intake Air Temperature Sensor -G42-, CHECKING - 5 .
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