Pickup 2WD L4-2.3L (4ZD1) (1988)
Malfunction Indicator Lamp: Description and Operation
During normal engine operation, the dashboard mounted ``Check Engine'' lamp is off.
If a problem develops in the ``Closed Loop Emission Control System'' while the engine is running, the ``Check Engine'' lamp will light and a trouble
code will be stored in the ECM. The light will remain lit as long as there is a problem and the engine is running. If the problem should clear up, the
``Check Engine'' lamp will go out, but a trouble code will be stored in the ECM. If the ``Check Engine'' lamp is On or was On, refer to System
Self-Diagnosis.
With the ignition switch On with the engine not running, the ``Check Engine'' lamp should light as a bulb test.