Civic Sedan L4-1590cc 1.6L SOHC (D16A6) MFI (1990)
Idle Speed/Throttle Actuator - Electronic: Testing and Inspection
Engine Difficult to Start When Cold
SYMPTOM
Engine Hard to Start When Cold
Check:
1. Coolant Temperature (TW) Sensor (6)
2. Fuel Supply
a. Fuel Filter
b. Fuel Pump
c. Fuel Injector (16)
3. Idle Control System
a. Electronic Air Control Valve (EACV) (14)
b. Idle Adjusting Screw
4. Manifold Absolute Pressure (MAP) Sensor (3)(5)
5. PGM-FI Control (ECU) Unit (BU)
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.
Self-diagnosis indicator, (LED) blinks (?), will follow associated systems.
Fast Idle Out of Specification When Cold
SYMPTOM
Fast Idle Out Of Specification When Cold
Check:
1. Idle Control System
a. Fast Idle Control
b. Electronic Air Control Valve (EACV) (14)
c. Idle Adjusting Screw
d. Hoses and Connections
2. Air Intake System
a. Throttle Control System
b. Throttle Body
c. Throttle Cable
3. Coolant Temperature (TW) Sensor (6)
4. PGM-FI Control (ECU) Unit (BU)
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.
Frequent Stalling After Warm Up
SYMPTOM
Frequent Stalling After Warm Up
Check:
1. Idle Control System
a. Electronic Air Control Valve (EACV) (14)
b. Idle Adjusting Screw
2. Fuel Supply
a. Fuel Injector (16)
b. Fuel Pump
c. Fuel Filter