Secondary Air Injection Solenoid Valve, Checking
Special Tools And Workshop Equipment Required
- Multimeter.
- Wiring diagram.
Test Requirements
- The Secondary Air Injection (SAI) Solenoid Valve --N112-- fuse OK.
- The Engine Control Module (ECM) Power Supply Relay -J271- and the Fuel Pump Relay -J17- fuse OK.
- Battery voltage at least 12.5 V.
- All electrical consumers switched off (radiator fan must NOT run during test).
- A/C switched off.
- The ignition switched OFF.
Test Procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .
Start Diagnosis
Voltage is supplied to the Secondary Air Injection (SAI) Solenoid Valve --N112-- from the Engine Control Module (ECM) Power Supply Relay -J271- on early models, or the Fuel Pump Relay -J17- on later models. Refer to Appropriate System Diagrams for circuit/pin locations.
Procedure
-- Disconnect the Secondary Air Injection (SAI) Solenoid Valve --N112-- electrical harness connector.
Checking internal resistance
-- Using a multimeter, check the Secondary Air Injection (SAI) Solenoid Valve --N112-- terminals 1 to 2 for resistance.
Specified Value: 3.5 - 8.5 Ω (At Approx. 20 °C)
If the specified value was Not obtained:
-- Replace the Secondary Air Injection (SAI) Solenoid Valve --N112--.
If The Specified Value Was Obtained:
Checking voltage supply
Start the engine.
-- Using a multimeter, check the Secondary Air Injection (SAI) Solenoid Valve --N112-- electrical connector terminal 1 to Ground for voltage.
Specified Value: Battery Voltage.
Switch the ignition OFF.
If the specified value was Not obtained:
-- Check the wiring from the Secondary Air Injection (SAI) Solenoid Valve --N112-- electrical connector terminal 1 to the Secondary Air Injection (SAI) Pump Relay -J299- or Fuel Pump Relay -J17- for a short circuit to Ground, or an open circuit. Refer to Appropriate System Diagrams for circuit layout/pin locations.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the wiring connection.
If The Specified Value Was Obtained:
Checking wiring
-- Remove the Engine Control Module (ECM) -J623-.
-- Using a multimeter, check the Secondary Air Injection (SAI) Solenoid Valve --N112-- electrical harness connector terminal 2 to the Engine Control Module (ECM) -J623- electrical harness connector T60 for an open circuit.
| Secondary Air Injection (SAI) Solenoid Valve --N112-- electrical harness connector terminal: | Engine Control Module (ECM) -J623- electrical connector T60 terminal: |
|---|---|
| 2 | 48 |
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-.
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 .