Note: The following procedure applies to F8Q 620 engines only. On F9Q engines, the cold start system is controlled by the injection system ECU.
Examination
1. To check the system operation, start the engine (cold) and listen to its operation, detonation or harshness should disappear after a time from 30 seconds to 2 minutes 45 seconds. This indicates that the system is working correctly.
2. If you suspect that the system is not working, check for voltage on the supply wire of the valve winding with the starter on and for 5-6 seconds after starting the engine (the power supply to the winding is controlled by the preheating system unit).
3. If power is present but the system does not operate, the solenoid valve is likely faulty and should be replaced.
Removal
Engine F8Q
Note: Be careful not to allow dirt to enter the fuel pump. Use a new sealing washer when installing.
1a. Electromagnet (4) for injection advance during cold start - Bosch fuel injection pump
1b. Cold start injection advance solenoid - Lucas fuel injection pump
1c. Disconnect the ground cable from the battery (refer to Chapter Engine electrical equipment for Scenic models), then disconnect the valve coil wiring.
Warning! If the car radio in your car is coded, make sure you know the code before disconnecting the battery.
2. Unscrew the solenoid valve from the pump and remove the washer. Work very carefully to avoid getting dirt into the pump.
Engine F9Q
1. Loosen the high-pressure pipe bolts on the fuel pump and fuel injectors. Remove the pipes. To prevent dirt from getting into the block, cover the ends of the pipes with fingers cut off from a rubber glove (clean!).
2. Disconnect the two electrical connectors from the pump.
3. Remove the right pump-to-engine mounting plate.
4. Remove the steel plate. This plate is held in place by the hydraulic head mounting bolt.
5. Clean the mounting location of the injection timing correction solenoid valve to the pump, then remove the valve.
Installation
Engine F8Q
1. Install in reverse order, use a new sealing washer.
Engine F9Q
1. Install in reverse order, use a new sealing ring. Observe the tightening torques of the hydraulic head mounting bolt and valve mounting bolts.