Exhaust Gas Recirculation Pressure Sensor 2 -G692-, Checking

General Description

Exhaust Gas Temperature Sensors are positive temperature coefficient (PTC) sensors. They measure the temperature of the exhaust gas. The ECM uses the signals from Exhaust Gas Temperature Sensors to calculate the amount of contamination in the diesel particulate filter, also to protect the turbocharger from unacceptably high exhaust gas temperatures. The diesel particulate filter contamination status is calculated using these signals from the Exhaust Gas Temperature Sensors, together with the signals from; Exhaust Gas Recirculation Pressure Sensor -G691-, Differential Pressure Sensor -G505-, Exhaust Gas Recirculation Pressure Sensor -G692-, Mass Airflow Sensor -G70-, and Heated Oxygen Sensor -G39-. The signal also serves as component protection in order to protect the diesel particulate filter and turbocharger from excessively high exhaust gas temperatures.

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 .
For Hybrid vehicles 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: GO TO: Step 2 . -- NO: GATHER more Information from customer about the complaint
2	IGNITION: OFF DISCONNECT: Exhaust Gas Recirculation Pressure Sensor 2 -G692- harness connector IGNITION: ON CHECK: Exhaust Gas Recirculation Pressure Sensor 2 -G692- harness connector terminals 1 to 2 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: Exhaust Gas Recirculation Pressure Sensor 2 -G692- harness connector terminal 3 to the Engine Control Module - J623- harness connector T94 / 79. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω) -- Was value obtained?	-- YES: REPLACE: Exhaust Gas Recirculation Pressure Sensor 2 -G692- 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: Exhaust Gas Recirculation Pressure Sensor 2 -G692- harness connector terminal 1 to the Engine Control Module - J623- harness connector T94 / 82. CHECK: Exhaust Gas Recirculation Pressure Sensor 2 -G692- harness connector terminal 2 to the Engine Control Module - J623- harness connector T94 / 80. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω) -- Was value obtained?	-- YES: REPLACE: Exhaust Gas Recirculation Pressure Sensor 2 -G692-. 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
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 service 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.