CHECK ENGINE LIGHT
That is a warning light that comes on if the computerized engine
control system detects an engine performance or emissions problem. Also
called the "malfunction indicator lamp" (MIL).
Your first step is to have the computer scanned to retreive the trouble
codes that were set when the check engine light came on. Those codes
will get you pointed in the right direction.
Here's the procedure to retreive the codes.
To call up codes, cycle ignition switch on, off, on, off and on within 5 seconds. Stored codes will be indicated by flashes of the power loss/check engine lamp. The codes will be indicated as two digit numbers, with a four second pause between codes. An example of a code is as follows:
- Power Loss/Check Engine Lamp illuminated for approximately 2 to 3 seconds as a bulb check, then turns off.
- Lamp flashes 2 times, pauses, then flashes 6 times.
- Lamp pauses for approximately 4 seconds.
- Lamp flashes 3 times, pauses, then flashes 1 time.
This would indicate that code 26 and 31 are stored. The lamp will continue to flash until all stored codes have been displayed.
Once the lamp starts flashing the stored fault codes, it cannot be stopped. If a code is missed, the entire procedure must be repeated. The lamp will not indicate if oxygen feedback system is switching lean-rich or if idle motor system is operational. The lamp also cannot be used to perform actuation test mode, sensor test mode or engine running test mode.
After all fault codes have been displayed, then power loss/check engine lamp can be used to verify switch function. The lamp will turn on and off as the switch is turned on and off.