Civic Sedan L4-1590cc 1.6L SOHC (D16A6) MFI (1990)
SYMPTOM
RPM Too Low When Warm
Check:
1. See IDLE CONTROL SYSTEM (WARM ENGINE RPM TOO LOW)
2. Fuel Injector (16)
3. Electric Load Detector (20)
4. Air Intake System
a. Throttle Body
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.
Rough Idle
SYMPTOM
Rough Idle
Check:
1. Idle Control System
a. Hoses and Connections
b. Electronic Air Control Valve (EACV) (14)
c. Idle Adjusting Screw
2. Fuel Supply
a. Pressure Regulator
b. Fuel Injector (16)
3. Manifold Absolute Pressure (MAP) (3)(5)
4. Emission Control System
a. Positive Crankcase Ventilation (PCV) System
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.