Secondary Air Injection Sensor 1, Checking: Notes

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse -SB10- OK.
• The Motronic Engine Control Module Power Supply Relay -J271- OK.
• The ignition switched OFF.

Test procedure 

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

Start diagnosis 

-- Remove the engine covers. Refer to the appropriate Service Information.

-- Disconnect the Secondary Air Injection Sensor 1 -G609- electrical harness connector -1-.

Checking voltage supply 

-- Switch the ignition ON.

-- Using a Multimeter, Check the Secondary Air Injection Sensor 1 -G609- electrical harness connector terminals 1 to 3 for voltage.

Specified value: near 5.0 V.

-- Switch the Ignition OFF.

Continue test according to the following table:

Value	Cause	Test
If the specified value was not obtained:	Open or shorted circuit	SECONDARY AIR INJECTION SENSOR 1, CHECKING => Checking wiring
If the specified value was obtained:	Check reference signal circuit	SECONDARY AIR INJECTION SENSOR 1, CHECKING => Checking wiring