Engine Difficult to Start When Cold

SYMPTOM
Engine Difficult to Start When Cold

Check:
1. Coolant Temperature (TW) Sensor (6)
2. Electronic Air Control Valve (EACV) (14)
3. Manifold Absolute Pressure (MAP) Sensor (3)(5)

NOTE:
After each symptom, the system that could be the source of the symptom are listed and should be checked in the order they are listed, beginning with #1.

(BU) code used when the CHECK ENGINE warning light is on, and the self-diagnosis indicator LED is ON with no "blinks", the back-up system is in operation. Substitute a known good ECU and recheck. If the indication goes away, replace the original ECU.

Self-diagnosis indicator, (LED) blinks (?), will follow associated systems.