Table 1-66 (Continued) 87 S/N Operation Test Results Actions 5 Remove the ignition metal wire from the spark plug. Install the wire to a normal spark plug. Place the bottom end of the spark plug towards the gound, and then turn to the engine. Check if the spark is normal. Yes Next step No Check ignition coil, giant transistor, and their circuits 6 Remove the spark plug. Check the place for dirts. No Next step Yes Repair or replace spark plug (standard type) 7 Check the pressure of the compressor. Standard: 1275kPa/300rpm; minimum: 981kPa/300rpm; difference among cylinders: 98kPa/300rpm.
Yes Next step No Check piston, piston ring, air intake valve, valve seat and cylinder head gasket 8 Install all the removed parts. Release the fuel pressure to 0. Install fuel pressure gauge. Check if the pressure is normal. Yes Next step No Check as per fuel pressure test method 9 Check the ignition time (15°±5°BDTC). The target idle speed is M/T:800±50rpm. Yes Next step No Basic check 10 Start the engine for warm-up. After the engine reaches normal operation speed, measure the voltage between the pin J1-62 (front oxygen sensor high signal) or J1-06 (front oxygen sensor low signal) of the ECU and the ground.
Under the rotation speed of 2000rpm, the changes between 0V-0.3V and 0.6V-1.0V should be no less than 5 times, at least one time higher than 0.6V, at least one time lower than 0.3V, an no higher than 1V. Yes Next step No Renew front oxygen sensor 11 Check the intake air sensor signal with a diagnostic instrument. (2.0-6.0gm/sec, at idle speed, 7.0-20.0gm/sec, at 2500rpm) Yes Replace ECU No Check the connector of the air intake temperature sensor circuit for rust or looseness.