CONTROL SYSTEM — ECM Terminal Voltage Specification

F2-144spec table

MTX (manual transaxle) vs ATX (automatic transaxle) distinctions noted for terminals 1R, 1U, 1S; RH/LH heated oxygen sensors for K8 V6.

Continued from F2-143

NOTE

B+: Battery positive voltage

ECM Terminal — Input/Output, Connection, Test Condition, Correct Voltage

Terminal	Input	Output	Connection to	Test condition	Correct voltage	Remarks
1M	O		Vehicle speed sensor	Ignition switch ON	0V or approx. 5.0V	—
1M	O		Vehicle speed sensor	Driving	Approx. 2.5V	—
1N	O		P/S pressure switch	Ignition switch ON	B+	—
1N	O		P/S pressure switch	P/S ON at idle	Below 1.0V	—
1N	O		P/S pressure switch	P/S OFF at idle	B+	—
1O	O		A/C switch	A/C switch ON	1.5-3.5V	Ignition switch ON and blower motor ON
1O	O		A/C switch	A/C switch OFF	4.5-5.5V	Ignition switch ON and blower motor ON
1P	O		Fan switch	Fan speed control 2nd-4th position	Below 1.0V	Ignition switch ON and blower motor ON
1P	O		Fan switch	Fan speed control 1st position or fan switch OFF	B+	Ignition switch ON and blower motor ON
1Q	O		Brake switch	Brake pedal released	Below 1.0V	—
1Q	O		Brake switch	Brake pedal depressed	B+	—
1R	O		Neutral/Clutch switch (MTX)	Neutral position or clutch pedal depressed	Below 1.0V	Ignition switch ON
1R	O		Neutral/Clutch switch (MTX)	Others	B+	Ignition switch ON
1R	O		TCM (ATX)	N or P range	Below 1.0V	—
1R	O		TCM (ATX)	Others	B+	—
1S	O		TCM (ATX)	At shifting	Approx. 2.5V	—
1S	O		TCM (ATX)	Others	B+	—
1T	O		Throttle position sensor (Closed throttle position switch)	Accelerator pedal released	Below 1.0V	Ignition switch ON
1T	O		Throttle position sensor (Closed throttle position switch)	Accelerator pedal depressed	B+	Ignition switch ON
1U	O		Ground (MTX)	Constant	0V	—
1V	O		TCM	At shifting	0V	—
1V	O		TCM	Others	B+	—
2A	—	—	—	—	—	—
2B	O		Volume air flow sensor	Ignition switch ON	Approx. 4V	—
2B	O		Volume air flow sensor	Idle	Approx. 2.6V	—
2C	O		Heated oxygen sensor (RH)	Ignition switch ON	0V	—
2C	O		Heated oxygen sensor (RH)	Idle (After warm-up)	0-1.0V	—
2D	O		Heated oxygen sensor (LH)	Acceleration (After warm-up)	0.5-1.0V	—
2D	O		Heated oxygen sensor (LH)	Deceleration	0-0.4V	—
2E	O		Engine coolant temperature sensor	Engine coolant temperature 20°C {68°F}	Approx. 3.1V	Ignition switch ON
2E	O		Engine coolant temperature sensor	After warm-up	Approx. 0.9V	Ignition switch ON
2F	O		Throttle position sensor	Closed throttle position	0.1—1.1V	Ignition switch ON
2F	O		Throttle position sensor	Wide open throttle	2.8—4.5V	Ignition switch ON

InputO

Output

Connection toVehicle speed sensor

Test conditionIgnition switch ON

Correct voltage0V or approx. 5.0V

Remarks—

InputO

Output

Connection toVehicle speed sensor

Test conditionDriving

Correct voltageApprox. 2.5V

Remarks—

InputO

Output

Connection toP/S pressure switch

Test conditionIgnition switch ON

Correct voltageB+

Remarks—

InputO

Output

Connection toP/S pressure switch

Test conditionP/S ON at idle

Correct voltageBelow 1.0V

Remarks—

InputO

Output

Connection toP/S pressure switch

Test conditionP/S OFF at idle

Correct voltageB+

Remarks—

InputO

Output

Connection toA/C switch

Test conditionA/C switch ON

Correct voltage1.5-3.5V

RemarksIgnition switch ON and blower motor ON

InputO

Output

Connection toA/C switch

Test conditionA/C switch OFF

Correct voltage4.5-5.5V

RemarksIgnition switch ON and blower motor ON

InputO

Output

Connection toFan switch

Test conditionFan speed control 2nd-4th position

Correct voltageBelow 1.0V

RemarksIgnition switch ON and blower motor ON

InputO

Output

Connection toFan switch

Test conditionFan speed control 1st position or fan switch OFF

Correct voltageB+

RemarksIgnition switch ON and blower motor ON

InputO

Output

Connection toBrake switch

Test conditionBrake pedal released

Correct voltageBelow 1.0V

Remarks—

InputO

Output

Connection toBrake switch

Test conditionBrake pedal depressed

Correct voltageB+

Remarks—

InputO

Output

Connection toNeutral/Clutch switch (MTX)

Test conditionNeutral position or clutch pedal depressed

Correct voltageBelow 1.0V

RemarksIgnition switch ON

InputO

Output

Connection toNeutral/Clutch switch (MTX)

Test conditionOthers

Correct voltageB+

RemarksIgnition switch ON

InputO

Output

Connection toTCM (ATX)

Test conditionN or P range

Correct voltageBelow 1.0V

Remarks—

InputO

Output

Connection toTCM (ATX)

Test conditionOthers

Correct voltageB+

Remarks—

InputO

Output

Connection toTCM (ATX)

Test conditionAt shifting

Correct voltageApprox. 2.5V

Remarks—

InputO

Output

Connection toTCM (ATX)

Test conditionOthers

Correct voltageB+

Remarks—

InputO

Output

Connection toThrottle position sensor (Closed throttle position switch)

Test conditionAccelerator pedal released

Correct voltageBelow 1.0V

RemarksIgnition switch ON

InputO

Output

Connection toThrottle position sensor (Closed throttle position switch)

Test conditionAccelerator pedal depressed

Correct voltageB+

RemarksIgnition switch ON

InputO

Output

Connection toGround (MTX)

Test conditionConstant

Correct voltage0V

Remarks—

InputO

Output

Connection toTCM

Test conditionAt shifting

Correct voltage0V

Remarks—

InputO

Output

Connection toTCM

Test conditionOthers

Correct voltageB+

Remarks—

Input—

Output—

Connection to—

Test condition—

Correct voltage—

Remarks—

InputO

Output

Connection toVolume air flow sensor

Test conditionIgnition switch ON

Correct voltageApprox. 4V

Remarks—

InputO

Output

Connection toVolume air flow sensor

Test conditionIdle

Correct voltageApprox. 2.6V

Remarks—

InputO

Output

Connection toHeated oxygen sensor (RH)

Test conditionIgnition switch ON

Correct voltage0V

Remarks—

InputO

Output

Connection toHeated oxygen sensor (RH)

Test conditionIdle (After warm-up)

Correct voltage0-1.0V

Remarks—

InputO

Output

Connection toHeated oxygen sensor (LH)

Test conditionAcceleration (After warm-up)

Correct voltage0.5-1.0V

Remarks—

InputO

Output

Connection toHeated oxygen sensor (LH)

Test conditionDeceleration

Correct voltage0-0.4V

Remarks—

InputO

Output

Connection toEngine coolant temperature sensor

Test conditionEngine coolant temperature 20°C {68°F}

Correct voltageApprox. 3.1V

RemarksIgnition switch ON

InputO

Output

Connection toEngine coolant temperature sensor

Test conditionAfter warm-up

Correct voltageApprox. 0.9V

RemarksIgnition switch ON

InputO

Output

Connection toThrottle position sensor

Test conditionClosed throttle position

Correct voltage0.1—1.1V

RemarksIgnition switch ON

InputO

Output

Connection toThrottle position sensor

Test conditionWide open throttle

Correct voltage2.8—4.5V

RemarksIgnition switch ON

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CONTROL SYSTEM — ECM Terminal Voltage Specification

ECM Terminal — Input/Output, Connection, Test Condition, Correct Voltage

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