Range Rover
WARNING: This page is about a different car, the 2002 Land Rover Range Rover, 2002 Land Rover Freelander, and 2002 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.
- When the engine is started, the ECM checks the engine coolant temperature. If Engine Coolant Temperature (ECT) indicates that coolant temperature is less than 131°F (55°C), ECM will activate the Secondary Air Injection (SAI) system. Ensure ECT sensor is operating properly.
- ECT sensor ground is at ECM 52-pin connector C0636 terminal No. 21 (Red/Black wire). ECT sensor input analog 0-5 volt signal is at ECM 52-pin connector C0636 terminal No. 22 (Green/Blue wire). See Figure and Figure . See WIRING DIAGRAMS article. See Fig 1.
- When SAI pump relay is energized, battery voltage is supplied to relay coil connector terminal No. 5 via fusible link No. 2 (50-amp) located in the engine compartment fuse/relay box. SAI pump relay operation is controlled through ground at ECM 52-pin connector C0636 terminal No. 16 (Brown/Green wire).
- When the main relay is energized, battery voltage is supplied to SAI vacuum solenoid valve connector terminal No. 1 (Brown/Pink wire) via fuse No. 26 (20-amp) located in engine compartment fuse/relay box. SAI vacuum solenoid valve operation is controlled through ground at ECM 52-pin connector C0636 terminal No. 4 (Pink/Blue wire). SAI vacuum solenoid valve is energized at the same time as the SAI air pump is energized.