Secondary Air Injection Sensor 1, Checking
Special Tools And Workshop Equipment Required
- multimeter
- Wiring diagram.
Test Requirements
- The Motronic Engine Control Module (ECM) - J623- fuses OK.
- The fuel filter OK.
- The battery voltage at least 12.5 V.
- 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
-- 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 (GND) | near 5 V |
-- 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 Motronic 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 Motronic Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit according to the wiring diagram.
| Fuel Pressure Sensor -G247- electrical harness connector terminals | Motronic 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 Motronic 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:
- 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 .