TROUBLESHOOTING GUIDE - ENGINE CONTROL OPERATION CHART - Input Devices and Engine Conditions
F-12spec tableENGINE CONTROL OPERATION CHART
Input Devices and Engine Conditions
Engine Control Operation Chart - Input Devices and Engine Conditions
CRANKING — COLD ENGINE • COLD AIR • COLD COOLANT
Approximate Time (based on 10–16°C or 50–60°F ambient)ZERO
Crank Angle Sensor - G-SignalSENDS No.1 CYLINDER TDC SIGNAL TO ECU
Crank Angle Sensor - Ne-SignalSENDS ENGINE SPEED SIGNAL TO ECU
Airflow Meter - Intake Air ThermosensorSIGNAL HAS NO EFFECT ON ECU
Airflow Meter - PotentiometerSIGNAL HAS NO EFFECT ON ECU
Water ThermosensorCOOL TO WARM: MEDIUM VOLTAGE (2.3V and DROPPING)
Oxygen SensorSIGNAL HAS NO EFFECT ON ECU
IGF SignalSENDS IGNITION SPARK SIGNAL TO ECU
Atmospheric Pressure SensorSENDS VOLTAGE SIGNAL TO ECU THAT VARIES WITH ALTITUDE: MEDIUM VOLTAGE (APPROX. 4V)
COLD START — FAST IDLE • COLD AIR • COLD COOLANT
Approximate Time (based on 10–16°C or 50–60°F ambient)ONE MINUTE
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air Thermosensor
Airflow Meter - PotentiometerLOW VOLUME AIRFLOW: LOW VOLTAGE (3.0V)
Water Thermosensor
Oxygen SensorSENSOR COLD: LOW TO HIGH VOLTAGE (0—0.6V)
IGF Signal
Atmospheric Pressure Sensor
COLD DRIVEAWAY — PART THROTTLE • WARM AIR • WARM COOLANT
Approximate Time (based on 10–16°C or 50–60°F ambient)TWO MINUTES
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air Thermosensor
Airflow Meter - Potentiometer
Water Thermosensor
Oxygen Sensor
IGF Signal
Atmospheric Pressure Sensor
WARM DRIVEAWAY — PART THROTTLE • WARM AIR • WARM COOLANT
Approximate Time (based on 10–16°C or 50–60°F ambient)THREE MINUTES
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air Thermosensor
Airflow Meter - PotentiometerMODERATE VOLUME AIRFLOW: LOW TO MEDIUM VOLTAGE (1—3.5V)
Water ThermosensorWARM: MEDIUM VOLTAGE (APPROX. 0.7V and DROPPING)
Oxygen SensorSENSOR WARM: MEDIUM TO HIGH VOLTAGE (ABOVE 0.6V)
IGF Signal
Atmospheric Pressure Sensor
HOT CRUISE • WARM AIR • WARM COOLANT
Approximate Time (based on 10–16°C or 50–60°F ambient)
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air ThermosensorCOOL TO WARM: MEDIUM VOLTAGE (4.3—1.5V)
Airflow Meter - Potentiometer
Water Thermosensor
Oxygen SensorSENSOR HOT: SWITCHING FROM HIGH VOLTAGE (ABOVE 0.6V RICH) TO LOW VOLTAGE (BELOW 0.4V LEAN)
IGF Signal
Atmospheric Pressure Sensor
HOT ACCELERATION — 60% THROTTLE
Approximate Time (based on 10–16°C or 50–60°F ambient)
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air Thermosensor
Airflow Meter - PotentiometerMODERATE TO STRONG VOLUME AIRFLOW: (0.5—1.5V)
Water Thermosensor
Oxygen SensorHIGH VOLTAGE (ABOVE 0.6V RICH)
IGF Signal
Atmospheric Pressure Sensor
HOT ACCELERATION — WIDE OPEN THROTTLE
Approximate Time (based on 10–16°C or 50–60°F ambient)MORE THAN FOUR MINUTES
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air Thermosensor
Airflow Meter - Potentiometer
Water ThermosensorHOT: LOW VOLTAGE (APPROX. 0.4V)
Oxygen Sensor
IGF Signal
Atmospheric Pressure Sensor
DECELERATION — CLOSED THROTTLE
Approximate Time (based on 10–16°C or 50–60°F ambient)
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air Thermosensor
Airflow Meter - Potentiometer
Water Thermosensor
Oxygen SensorLOW VOLTAGE (BELOW 0.4V LEAN)
IGF Signal
Atmospheric Pressure Sensor
HOT CURB IDLE — EXTENDED
Approximate Time (based on 10–16°C or 50–60°F ambient)
Crank Angle Sensor - G-Signal
Crank Angle Sensor - Ne-Signal
Airflow Meter - Intake Air Thermosensor
Airflow Meter - PotentiometerLOW VOLUME AIRFLOW (3.0V)
Water Thermosensor
Oxygen SensorSWITCHING FROM HIGH TO LOW VOLTAGE (0.4—0.6V)
IGF Signal
Atmospheric Pressure Sensor
HOT ENGINE SHUTDOWN
Approximate Time (based on 10–16°C or 50–60°F ambient)
Crank Angle Sensor - G-SignalOFF
Crank Angle Sensor - Ne-SignalOFF
Airflow Meter - Intake Air ThermosensorOFF
Airflow Meter - PotentiometerOFF
Water ThermosensorOFF
Oxygen SensorSENSOR HOT: LOW VOLTAGE (0.1V LEAN) UNTIL SENSOR COOLS DOWN
IGF SignalOFF
Atmospheric Pressure SensorOFF