Charge Air Pressure Control Module - GX34-, CHECKING

General Description

The required boost pressure is calculated by the Engine Control Module -J623- from the torque request. The Charge Air Pressure Actuator Position Sensor -G581- provides the measurement of the boost pressure to the Engine Control Module -J623-. The Engine Control Module -J623- then adjusts the boost pressure using the Charge Air Pressure Actuator -V465-.

The Charge Air Pressure Control Module -GX34- contains the following components:

Charge Air Pressure Actuator Position Sensor -G581-.
Charge Air Pressure Actuator -V465-.

The Charge Air Pressure Control Module -GX34- components cannot be serviced separately, and they 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 complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2. -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Charge Air Pressure Control Module -GX34- harness connector. IGNITION: ON. CHECK: Charge Air Pressure Control Module -GX34- harness connector terminals 1 to 3 for voltage. IGNITION: OFF. SPECIFIED VALUE: About 5.0 V. -- Was Value obtained?	-- YES: GO TO: Step 3. -- NO: GO TO: Step 4.
3	REMOVE: Engine Control Module - J623-. Refer to appropriate Service Information. CHECK: Charge Air Pressure Control Module -GX34- harness connector terminal 2 to the Engine Control Module - J623- harness connector T105 / 88 for resistance. CHECK: Charge Air Pressure Control Module -GX34- harness connector terminal 5 to the Engine Control Module - J623- harness connector T105 / 41 for resistance. CHECK: Charge Air Pressure Control Module -GX34- harness connector terminal 6 to the Engine Control Module - J623- harness connector T105 / 89 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Charge Air Pressure Control Module -GX34-. 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 Control Module - J623-. Refer to appropriate Service Information. CHECK: Charge Air Pressure Control Module -GX34- harness connector terminal 1 to the Engine Control Module - J623- harness connector T105 / 61 for resistance. CHECK: Charge Air Pressure Control Module -GX34- harness connector terminal 3 to the Engine Control Module - J623- harness connector T105 / 20 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: 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.
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. If all electrical connections are OK: REPLACE: Engine 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.