Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
201
3. Diagnosis
ECU does not function to diagnose ignition coil failures. Therefore, if there is any failure of ignition coil,
no DTC is set. Only by checking the ignition coil resistance can the proper working of the ignition coil
be determined; under normal circumstances, the ignition coil heats up more during working, but
overheated temperature of the ignition coil causes increaseing in ignition coil resistance, resulting in
instability of engine work, automatic flameout and other failures. But the ECU can detect the control
cable of the ignition coil. When failure of an ignition coil is detected, injector of corresponding cylinder
will be turned off.
Control cable short circuit with ground;
Control cable short circuit with power line;
Control circuit open.
4. Diagnosis
Internal short circuit, open circuit of coil;
Coil leakage, cracks in the housing;
Aging coil leading to energy shortage in ignition.
5. Removal and installation
For removal and installation, please see "Ignition System."
XII. Electric Fuel Pump
1. Description
It is used to deliver the fuel to the main fuel supply pipe from the fuel tank at a certain fuel pressure and
flow, and maintain the stable fuel pressure (through the fuel pressure regulator).
2. Installation Position
It is installed inside the fuel tank
3. Wiring diagram
Pins description: the electric fuel pump has two pins, and the fuel pump casings next to the two pins are
marked with "+" and "-" signs, which represent respectively the connections to the positive (fuel pump
relay) and ground.
