(4) Wiring diagram of the parts (Fig. 1-18) Fig. 1-18 (5) Trouble diagnosis: The ECU will not carry out trouble diagnosis for the ignition coil. Therefore, when trouble occurs on the ignition coil, no diagnostic trouble code will be produced. Only the resistance of the ignition coil can be checked for the normal operation of the coil. Under normal situation, the heat emitted by the coil under operation will be high, and the over-high temperature of the coil will increase its resistance value, which will cause such troubles as unstable running, automatic misfiring for the engine. Primary winding: 0.47Ω; secondary winding: 8Ω 11. Canister control valve (Fig. 1-19) (1) Function:
To control the air flow to clean the canister. The canister control valve is controlled by the ECU based on the engine load, electric pulse duration and frequency (duty cycle). The over-accumulated gasoline vapor in the activated canister will cause gasoline leakage and environmental pollution. Thus, the canister solenoid valve is designed to be opened properly to introduce the over-accumulated gasoline vapor into the intake pipe for combustion. Fig. 1-19 (2) Structure and principle: Consists of solenoid coil, armature, valves, etc. A filter is considered for the inlet hole.
The air volume flows through the canister control valve is affected by the duty cycle of the electric pulse output by the ECU, meanwhile, it is also affected by the pressure 36