Precautions - Engine Fuel & Emission Control System

Always use a 12 volt battery as power source.

Do not attempt to disconnect battery cables while engine is running.

Do not disconnect injector harness connectors with engine running.

Do not apply battery power directly to injectors.

Handle air flow meter carefully to avoid damage.

Do not disassemble air flow meter.

Do not clean air flow meter with any type of detergent.

Do not disassemble auxiliary air control valve.

Even a slight leak in the air intake system can cause serious problems.

Do not shock or jar the crank angle sensor.

Do not depress accelerator pedal when starting.

Immediately after starting, do not rev up engine unnecessarily.

Do not rev up engine just prior to shutdown.

Do not disassemble E.C.C.S. control unit (E.C.U.).

Do not turn diagnosis mode selector forcibly.

If a battery terminal is disconnected, the memory will return to the ROM value. The E.C.C.S. will now start to self-control at its initial value. Engine operation can vary slightly when the terminal is disconnected. However, this is not an indication of a problem. Do not replace parts because of a slight variation.

When installing C.B. ham radio or a mobile phone, be sure to observe the following as it may adversely affect electronic control systems depending on its installation location.

1) Keep the antenna as far away as possible from the electronic control units.

2) Keep the antenna feeder line more than 20 cm (7.9 in) away from the harness of electronic controls. Do not let them run parallel for a long distance.

3) Adjust the antenna and feeder line so that the standing-wave ratio can be kept smaller.

4) Be sure to ground the radio to vehicle body.

Do not operate fuel pump when there is no fuel in lines.

Tighten fuel hose clamps to the specified torque.

Securely connect E.C.C.S. harness connectors. A poor connection can cause an extremely high (surge) voltage to develop in coil and condenser, thus resulting in damage to ICs.

Keep E.C.C.S. harness at least 10 cm (3.9 in) away from adjacent harnesses, to prevent an E.C.C.S. system malfunction due to receiving external noise, degraded operation of ICs, etc.

Keep E.C.C.S. parts and harnesses dry.

Before removing parts, turn off ignition switch and then disconnect battery ground cable.