Emission Control Systems: Testing and Inspection

SYMPTOM:
Fails emission test.

CHECK:
1. Manifold Absolute Pressure Sensor (3)(5)
2. Oxygen Sensor (1)(2)
3. EGR Control System (12)
4. Other Emission Controls
5. Electronic Control Unit *

NOTE:
Numbers in parentheses are the blink codes displayed on the back of the ECU.
* LED on the ECU is not on, or stays on without blinking.
See "NOTES ON READING DIAGNOSTIC LIST" article for more information.