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Secondary Air Injection Sensor 1, Checking

Special tools and workshop equipment required 

Test requirements 

Test procedure 

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

Start diagnosis 

-- Remove the engine cover with air filter. Refer to the Repair information.

Checking voltage 

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

-- Switch the ignition ON.

-- Using a multimeter, check the Secondary Air Injection Sensor 1 -G609- electrical harness connector for voltage using the chart below.

Secondary Air Injection Sensor 1 -G609- electrical harness connector terminals Specified value
1 to Battery Positive Battery Voltage
3 to Ground near 5 V
4 to ECM pin T60/55 1.5 Ω Max.

-- Switch the ignition OFF.

If the specified value was obtained:

-- Replace the Secondary Air Injection Sensor 1 -G609-.

If the specified value was Not obtained:

Checking wiring connections 

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 1 -G609- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit. Refer to Wiring Diagrams for pin locations.

Secondary Air Injection Sensor 1 -G609- electrical harness connector terminals Engine Control Module (ECM) -J623- electrical connector T60 terminals or test box socket
1 13
3 44
4 55

Specified value: 1.5 Ω Max.

If the specified value was Not obtained:

-- Check the wiring for an open, high resistance or short to ground.

-- 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 the Repair information.

-- Install the engine cover with air filter. Refer to the Repair information.

Final procedures 

After the 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 .