CONTROL SYSTEM - Engine Control Unit Terminal Voltage Table (continued)

F-129spec table

Federal/Canada vs. California spec distinction at terminal 2H.

Engine Control Unit Terminal Voltage (1R-2R)

Terminal	Input	Output	Connection to	Test condition	Voltage	Remark
1R	O		Fan switch	Fan operating (Engine coolant temperature over 97°C (207°F) or diagnosis connector terminal TFA grounded)	Approx. 0V
1R	O		Fan switch	Fan not operating (Idle)	Approx. 12V
1S	O		Blower control switch	Blower control switch at mid, high or super high position	Approx. 0V	Ignition switch ON
1S	O		Blower control switch	Blower control switch OFF or low	Approx. 12V	Ignition switch ON
1T	—	—	—	—	—	—
1U	O		Headlight switch	Headlights ON (Tail, parking, low beam/high beam)	Approx. 12V
1U	O		Headlight switch	Headlights OFF	0V
1V	O		Neutral or clutch switch	Neutral position or clutch pedal depressed	Approx. 0V
1V	O		Neutral or clutch switch	Other conditions	Approx. 12V
2A	—	—	Ground (Injector)	Constant	0V
2B	—	—	Ground (Output)	Constant	0V
2C	—	—	Ground (CPU)	Constant	0V
2D	—	—	Ground (Input)	Constant	0V
2E	O		Crank angle sensor (Ne-signal)	Ignition switch ON	Approx. 0V or 5V
2E	O		Crank angle sensor (Ne-signal)	Idle	Approx. 2V
2F	—	—	—	—	—	—
2G	O		Crank angle sensor (G-signal)	Ignition switch ON	Approx. 0V or 5V
2G	O		Crank angle sensor (G-signal)	Idle	Approx. 1.5V
2H	O		Ground Open	California spec. Federal and Canada spec.	0V Approx. 2V
2I	O		Igniter	Ignition switch ON	Below 0.5V
2I	O		Igniter	Idle	Approx. 1V
2J	O		Ground	Constant	0V
2K		O	Airflow meter	Constant	4.5—5.5V
2L	O		Throttle sensor (Power terminal)	Accelerator pedal released	Approx. 0V
2L	O		Throttle sensor (Power terminal)	Accelerator pedal fully depressed	Approx. 0V
2M	—	—	—	—	—	—
2N	O		Oxygen sensor	Ignition switch ON	0V
2N	O		Oxygen sensor	Idle (Cold engine)	0V
2N	O		Oxygen sensor	Idle (After warm-up)	0—1V
2N	O		Oxygen sensor	Increase engine speed (After warm-up)	0.5—1V
2N	O		Oxygen sensor	Deceleration	0—0.4V
2O	O		Airflow meter	Ignition switch ON	Approx. 3.8V
2O	O		Airflow meter	Idle	Approx. 3.3V
2P	O		Airflow meter (Intake air thermosensor)	At 20°C (68°F)	Approx. 2.5V
2Q	O		Water thermosensor	Engine coolant temperature 20°C (68°F)	Approx. 2.5V
2Q	O		Water thermosensor	After warm up	Approx. 0.4V
2R	—	—	—	—	—	—

InputO

Output

Connection toFan switch

Test conditionFan operating (Engine coolant temperature over 97°C (207°F) or diagnosis connector terminal TFA grounded)

VoltageApprox. 0V

Remark

InputO

Output

Connection toFan switch

Test conditionFan not operating (Idle)

VoltageApprox. 12V

Remark

InputO

Output

Connection toBlower control switch

Test conditionBlower control switch at mid, high or super high position

VoltageApprox. 0V

RemarkIgnition switch ON

InputO

Output

Connection toBlower control switch

Test conditionBlower control switch OFF or low

VoltageApprox. 12V

RemarkIgnition switch ON

Input—

Output—

Connection to—

Test condition—

Voltage—

Remark—

InputO

Output

Connection toHeadlight switch

Test conditionHeadlights ON (Tail, parking, low beam/high beam)

VoltageApprox. 12V

Remark

InputO

Output

Connection toHeadlight switch

Test conditionHeadlights OFF

Voltage0V

Remark

InputO

Output

Connection toNeutral or clutch switch

Test conditionNeutral position or clutch pedal depressed

VoltageApprox. 0V

Remark

InputO

Output

Connection toNeutral or clutch switch

Test conditionOther conditions

VoltageApprox. 12V

Remark

Input—

Output—

Connection toGround (Injector)

Test conditionConstant

Voltage0V

Remark

Input—

Output—

Connection toGround (Output)

Test conditionConstant

Voltage0V

Remark

Input—

Output—

Connection toGround (CPU)

Test conditionConstant

Voltage0V

Remark

Input—

Output—

Connection toGround (Input)

Test conditionConstant

Voltage0V

Remark

InputO

Output

Connection toCrank angle sensor (Ne-signal)

Test conditionIgnition switch ON

VoltageApprox. 0V or 5V

Remark

InputO

Output

Connection toCrank angle sensor (Ne-signal)

Test conditionIdle

VoltageApprox. 2V

Remark

Input—

Output—

Connection to—

Test condition—

Voltage—

Remark—

InputO

Output

Connection toCrank angle sensor (G-signal)

Test conditionIgnition switch ON

VoltageApprox. 0V or 5V

Remark

InputO

Output

Connection toCrank angle sensor (G-signal)

Test conditionIdle

VoltageApprox. 1.5V

Remark

InputO

Output

Connection toGround Open

Test conditionCalifornia spec. Federal and Canada spec.

Voltage0V Approx. 2V

Remark

InputO

Output

Connection toIgniter

Test conditionIgnition switch ON

VoltageBelow 0.5V

Remark

InputO

Output

Connection toIgniter

Test conditionIdle

VoltageApprox. 1V

Remark

InputO

Output

Connection toGround

Test conditionConstant

Voltage0V

Remark

Input

OutputO

Connection toAirflow meter

Test conditionConstant

Voltage4.5—5.5V

Remark

InputO

Output

Connection toThrottle sensor (Power terminal)

Test conditionAccelerator pedal released

VoltageApprox. 0V

Remark

InputO

Output

Connection toThrottle sensor (Power terminal)

Test conditionAccelerator pedal fully depressed

VoltageApprox. 0V

Remark

Input—

Output—

Connection to—

Test condition—

Voltage—

Remark—

InputO

Output

Connection toOxygen sensor

Test conditionIgnition switch ON

Voltage0V

Remark

InputO

Output

Connection toOxygen sensor

Test conditionIdle (Cold engine)

Voltage0V

Remark

InputO

Output

Connection toOxygen sensor

Test conditionIdle (After warm-up)

Voltage0—1V

Remark

InputO

Output

Connection toOxygen sensor

Test conditionIncrease engine speed (After warm-up)

Voltage0.5—1V

Remark

InputO

Output

Connection toOxygen sensor

Test conditionDeceleration

Voltage0—0.4V

Remark

InputO

Output

Connection toAirflow meter

Test conditionIgnition switch ON

VoltageApprox. 3.8V

Remark

InputO

Output

Connection toAirflow meter

Test conditionIdle

VoltageApprox. 3.3V

Remark

InputO

Output

Connection toAirflow meter (Intake air thermosensor)

Test conditionAt 20°C (68°F)

VoltageApprox. 2.5V

Remark

InputO

Output

Connection toWater thermosensor

Test conditionEngine coolant temperature 20°C (68°F)

VoltageApprox. 2.5V

Remark

InputO

Output

Connection toWater thermosensor

Test conditionAfter warm up

VoltageApprox. 0.4V

Remark

Input—

Output—

Connection to—

Test condition—

Voltage—

Remark—

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CONTROL SYSTEM - Engine Control Unit Terminal Voltage Table (continued)

Engine Control Unit Terminal Voltage (1R-2R)

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