Checking the Basics

All troubleshooting must begin by "CHECKING THE BASICS". Certain basic faults can be undetectable by the self-diagnostic systems of the fuel and ignition control units and in some cases can actually interfere with the self-checking and fault memory operation.

Before troubleshooting, check the following items which might affect engine problems:

^ POWER SUPPLY
1. Measure battery voltage and specific gravity of electrolyte.

Standard voltage: 12 V
Specific gravity: Above 1.260

2. Check the condition of the main and other fuses, and harnesses and connectors. Also check for proper grounding.


^ CAPS AND PLUGS
1. Check that the fuel cap is properly closed.
2. Check that the oil filler cap is properly closed.
3. Check that the oil level gauge is properly inserted.


^ INTAKE MANIFOLD VACUUM PRESSURE
1. After warming up the engine, measure intake manifold vacuum pressure while at idle.


Standard vacuum pressure:
Approx. - 66.7 kPa (- 500 mmHg, - 19.69 in Hg).

2. Unusual vacuum pressure occurs because of air leaks, fuel or engine problems. In such a case, engine idles roughly.


^ FUEL PRESSURE
1. Release fuel pressure
2. Connect fuel pressure gauge between fuel filter and hose, and measure fuel pressure at idling. Refer to C.2-8 [W2AO].

Fuel pressure:
177 - 206 kPa (1.8 - 2.1 kg/cm2, 26 - 30 psi)

^ ENGINE GROUNDING
Make sure the engine grounding terminal is properly connected to the engine.