Pin Voltage Chart

ECU PIN VOLTAGE CHART ⁽¹⁾

Item

Condition

Data

Ignition Signal

Engine Running, Idle Speed

0.4-0.6V

Ignition Signal

Engine Running, 4000 RPM

1.9-2.1V

Ignition Check

Engine Running, Idle Speed

VBAT

4,5 14,15

AAC Valve

Engine Running, Racing Condition

⁽²⁾

Radiator Fan (High Speed)

Engine Running, Radiator Fan Is Not Operating

VBAT

Radiator Fan (High Speed)

Engine Running, Radiator Fan Is Operating

0.7-0.8V

Power Valve Control Solenoid

Engine Running, Idle Speed

VBAT

Power Valve Control Solenoid

Engine Racing, To 4000 RPM

0.7-0.8V

A/C Relay

Engine Running, A/C Switch OFF

VBAT

A/C Relay

Engine Running, A/C Switch ON

0.7-0.8V

ECU Power Source

Engine Running, Idle Speed

0.8-0.7V

ECU Power Source

Engine Not Running, For A Few Seconds After Ignition OFF

VBAT

Fuel Pump Relay

Engine Running, Normal

VBAT

Fuel Pump Relay

Engine Running, Abnormal Condition, ⁽³⁾

0.7-0.8V

Radiator Fan (Low Speed)

Engine Running, Radiator Fan Is Not Running

VBAT

Radiator Fan (Low Speed)

Engine Running, Radiator Fan Is Operating

0.7-0.8V

Detonation Sensor

Engine Running

3.0-4.0V

Electric Load Signal

Engine Running, Electric Load Signal Is OFF

VBAT

Electric Load Signal

Engine Running, Electric Load Signal (Rear Defogger) Is ON

0.1-0.3V

Airflow Meter

Engine Running, (Warm-Up Condition), Idle Speed

1.0-1.3V

Airflow Meter

Engine Running, (Warm-Up Condition), Speed Is 3000 RPM

1.8-2.0V

Engine Temp. Sensor

Engine Running ⁽⁴⁾

0-5.0V

Power Steering Pressure Switch

Engine Running, Steering Wheel Stays Straight

8.0-9.0V

Power Steering Pressure Switch

Engine Running, Steering Wheel Is Turned

0-0.2V

Throttle Sensor

Ignition Switch ON ⁽⁵⁾

0.5-4.2V

Exhaust Gas Temp. Sensor

Engine Running, (Warm-Up Condition), Idle Speed

1.0V Or More

Exhaust Gas Temp. Sensor

Engine Running, (Warm-Up Condition), EGR System Working

0-1.0V

41,51

Crank Angle Sensor Reference Signal

Engine Running ⁽⁶⁾

0.2-0.4V ⁽⁷⁾

42,52

Crank Angle Sensor Position Signal

Engine Running ⁽⁶⁾

2.5-2.7V ⁽⁷⁾

Start Signal

Ignition Switch ON

Start Signal

Ignition Switch In START

VBAT

Neutral Switch (Manual Trans.)

Ignition Switch ON, Gear Position Is Neutral

VBAT

Neutral Switch (Manual Trans.)

Ignition Switch ON, Gear Position Other Than Neutral

Inhibitor Switch (Auto. Trans.)

Ignition Switch ON, Gear Position Is "P" or "N"

VBAT

Inhibitor Switch (Auto. Trans.)

Ignition Switch ON, Gear Position Other Than "P" or "N"

Ignition Switch

Ignition Switch ON, Engine Stopped

VBAT

A/C Switch

Engine Running, A/C Switch OFF

8.0-9.0V

A/C Switch

Engine Running, A/C Switch ON

0.5-0.7V

Sensor Power Source

Ignition Switch ON, Engine OFF

Approx. 5.0V

Battery Source

Ignition Switch ON, Engine OFF

VBAT

Vehicle Speed Sensor

Ignition Switch ON, Engine OFF, While Rotating Wheel By Hand

0-1.0V

Idle Switch

Ignition Switch ON, Engine OFF, Accelerator Fully Released

9.0-10.0V

Idle Switch

Ignition Switch ON, Engine OFF, Accelerator Depressed

Idle Switch Power Source

Ignition ON, Engine OFF

8.0-9.0V

Power Supply

Ignition ON, Idle Speed

VBAT

101

Injectors

Ignition Switch OFF

VBAT

103

Injectors

Ignition Switch OFF

VBAT

105

Injectors

Ignition Switch OFF

VBAT

110

Injectors

Ignition Switch OFF

VBAT

112

Injectors

Ignition Switch OFF

VBAT

114

Injectors

Ignition Switch OFF

VBAT

102

EGR Control Solenoid Valve

Engine Running, (Warm-Up Condition), Idle Speed, Engine Speed Approx 3400 RPM or More

0.7-0.8V

EGR Control Solenoid Valve

Engine Running, (Warm-Up Condition), Engine Speed Between Idle & 3400 RPM

VBAT

104

Fuel Pump Voltage Control

5 Seconds After Turning Ignition Switch ON

VBAT

Fuel Pump Voltage Control

Engine Running, 30 Seconds After Engine Begins To Run

4.0-4.5V

Fuel Pump Voltage Control

Engine Running, Racing (Up To 4000 RPM)

2.0-4.5V

⁽¹⁾	VBAT is battery voltage (11-14V).

⁽²⁾	Voltage briefly decreases from battery voltage (11-14V).

⁽³⁾	Fuel pump voltage control circuit (ECU terminal No. 104 is inoperative).

⁽⁴⁾	Output voltage varies with engine temperature.

⁽⁵⁾	Output voltage varies with throttle valve opening angle.

⁽⁶⁾	DO NOT run engine at high speed under no-load.

⁽⁷⁾	Output voltage varies slightly with engine speed.