Secondary Air Injection Sensor 1 Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• The Engine Control Module (ECM) - J623- fuses OK.
• The parking brake engaged.
• The battery voltage at least 12.5 V.
• The selector lever of automatic transmission in position "P" or "N".
• All electrical consumers switched off (radiator fan must NOT run during test).
• A/C switched off.
• The fuel tank at least ¹ /₄ filled.
• The ignition switched off.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis 

-- Disconnect the Secondary Air Injection Sensor (AIR) 1 -G609,- electrical harness connector.

Checking voltage supply 

Switch the ignition On.

-- Using a multimeter, check the Secondary Air Injection Sensor (AIR) 1 -G609,- electrical harness connector for voltage.

Secondary Air Injection Sensor (AIR) 1 -G609,- electrical harness connector	Specified value
1 to Ground	near 5 V
2 to Battery positive (+)	Battery voltage (+)

Switch the ignition Off.

If the specified values were obtained:

-- Replace the Secondary Air Injection Sensor (AIR) 1 -G609,-.

If specified values were Not obtained:

Checking wiring 

If the manufacturers test box is being used. Perform the following step.

-- Install the test box.

If the manufacturers test box is not being used. Perform the following step.

-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Using a multimeter, check the Secondary Air Injection Sensor (AIR) 1 -G609,- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T121 terminals for resistance.

Secondary Air Injection Sensor (AIR) 1 -G609,- electrical harness connector	Engine Control Module (ECM) -J623- electrical harness connector T121 terminals or test box socket
1	50
2	53
3	74

Specified value: 1.5 Ω Max.

If the specification was Not obtained:

-- Check the wiring for an open circuit, high resistance, a short circuit to each other, Battery (+) or Ground.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If the specification was obtained:

-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Assembly is performed in the reverse of the removal.

Final procedures 

After repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .