Secondary Air Injection Sensor 1 G609, Checking

WARNING: This page is about a different car, the 2008 Volkswagen R32. However, it is still accessible from the selected car via links, so may be relevant.

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.

Fig 1: 3-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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

Switch the ignition off.

If the specified values are obtained:

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

If specified values are 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 ENGINE CONTROL MODULE J623, REPLACING .

-- 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, a short circuit to each other, Battery (+), or Ground (GND).

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

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring:

-- Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE J623, REPLACING .

-- 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:

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

End of diagnosis