Air Injection Pressure Sensor/Switch: Testing and Inspection

Secondary Air Injection Sensor 1, Checking

Special tools, testers and auxiliary items required

• multimeter.

• Wiring diagram.

Test requirements

• Fuse (SB10) OK.

• The Motronic Engine Control Module (ECM) Power Supply Relay (J271) OK.

• The ignition switched off.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.

Start diagnosis

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





Checking voltage supply

• The voltage for the Secondary Air Injection Sensor 1 (G609) is supplied by the Motronic Engine Control Module (ECM) Power Supply Relay (J271) OK.

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










- Operate the engine briefly.

Specified value: approx. 5 V.

- Switch the ignition off.

If the specified value was not obtained:

- Using a multimeter, check the Secondary Air Injection Sensor 1 (G609) electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) (J623)terminal T60/35 for resistance.





Specified value: 1.5 ohms max

If the specification was not obtained:

- Check the wiring for a short circuit to Battery positive (+) or an open circuit.

- 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 and if the voltage supply was OK:

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 appropriate service information.

- Using a multimeter, check the Secondary Air Injection Sensor 1 (G609) electrical harness connector terminals to Engine Control Module (ECM) (J623) electrical harness connector T60 terminals.










Specified value: 1.5 ohms max.

If the specification is not obtained:

- Check the wiring for a short circuit to Battery positive (+), or an open circuit.

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

- If necessary, repair the faulty wiring connection.

If no malfunction is found in wiring:

- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

- Replace the Engine Control Module (ECM) (J623). Refer to appropriate service information.

- Assembly is performed in the reverse of the removal.

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 ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.