Secondary Air Injection Sensor 1 -G609-, Checking

General Description

The secondary air injection system blows air into the exhaust on a cold-start of the engine for 45 - 100 seconds and serves to quickly heat the catalytic converter(s) for improved emissions. A pressure based secondary air diagnostic function is used. In this system, the signal from the Secondary Air Injection Sensor 1 -G609- is evaluated by the Engine Control Module -J623-.

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 Manual 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 Secondary Air Injection Sensor 1 -G609-, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Secondary Air Injection Sensor 1 -G609- harness connector. IGNITION: ON. CHECK: Secondary Air Injection Sensor 1 -G609- harness connector terminals 1 to 3 for voltage. SPECIFIED VALUE: About 5.0 V. IGNITION: OFF. -- Was Value obtained?	-- YES: GO TO: Step 3 Secondary Air Injection Sensor 1 -G609-, CHECKING - 3 . -- NO: GO TO: Step 4 Secondary Air Injection Sensor 1 -G609-, CHECKING - 4 .
3	REMOVE: Engine Control Module - J623-. Refer to the appropriate service information. CHECK: Secondary Air Injection Sensor 1 -G609- harness connector terminal 2 to the Engine Control Module - J623- harness connector T60 / 12 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Secondary Air Injection Sensor 1 -G609-. Refer to the appropriate service information. GO TO: Step 5 Secondary Air Injection Sensor 1 -G609-, 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 Secondary Air Injection Sensor 1 -G609-, CHECKING - 5 .
4	REMOVE: Engine Control Module - J623-. Refer to the appropriate service information. CHECK: Secondary Air Injection Sensor 1 -G609- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / 35 for resistance. CHECK: Secondary Air Injection Sensor 1 -G609- harness connector terminal 3 to the Engine Control Module - J623- harness connector T60 / 50 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Engine Control Module -J623-. Refer to the appropriate service information. GO TO: Step 5 Secondary Air Injection Sensor 1 -G609-, 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 Secondary Air Injection Sensor 1 -G609-, CHECKING - 5 .
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