Terminal Voltage

Z-46spec table

K8 DOHC ECM terminal voltage reference. Terminal 1R/1S/1V/1U differ between MTX and ATX. Page scanned at low resolution; several voltage values uncertain and marked with [?].

B-2

Terminal Voltage

NOTE

B+: Battery positive voltage

Terminal voltage — terminals 1A–1L

Terminal	Input/Output	Connection to	Test condition	Correct voltage	Remarks
1A	Input	Battery	Constant	B+	For backup
1B	Input	Main relay (FUEL INJ relay)	Ignition switch OFF	0V	—
1B	Input	Main relay (FUEL INJ relay)	Ignition switch ON	B+	—
1C	Input	Ignition switch (START)	While cranking	10V	—
1C	Input	Ignition switch (START)	Ignition switch ON	Below 1.5V	—
1D	Output	Data link connector (MEN terminal)	Test switch at "SELF-TEST"; Lamp illuminated for 3 sec. after ignition switch OFF → ON	4.5–5.5V	With Self-Diagnosis Checker and System Selector
1D	Output	Data link connector (MEN terminal)	Lamp not illuminated after 3 sec.	B+	With Self-Diagnosis Checker and System Selector
1D	Output	Data link connector (MEN terminal)	Test switch at "O2 MONITOR" at idle; Monitor lamp illuminated	4.5–5.5V	With Self-Diagnosis Checker and System Selector
1D	Output	Data link connector (MEN terminal)	Test switch at "O2 MONITOR" at idle; Monitor lamp not illuminated	B+	With Self-Diagnosis Checker and System Selector
1E	Output	Malfunction indicator light (MIL)	Light illuminated for 3 sec. after ignition switch OFF → ON	Below 2.5V	With System Selector test switch at "SELF-TEST"
1E	Output	Malfunction indicator light (MIL)	Light not illuminated after 3 sec.	B+	With System Selector test switch at "SELF-TEST"
1E	Output	Malfunction indicator light (MIL)	Light illuminated	Below 2.5V	With System Selector test switch at "SELF-TEST"
1E	Output	Malfunction indicator light (MIL)	Light not illuminated	B+	With System Selector test switch at "SELF-TEST"
1E	Output	Data link connector (FEN terminal)	Buzzer sounded for 3 sec. after ignition switch OFF → ON	Below 2.5V	With Self-Diagnosis Checker and System Selector; With System Selector test switch at "SELF-TEST"
1E	Output	Data link connector (FEN terminal)	Buzzer not sounded after 3 sec.	B+	With System Selector test switch at "SELF-TEST"
1E	Output	Data link connector (FEN terminal)	Buzzer sounded	Below 2.5V	With System Selector test switch at "SELF-TEST"
1E	Output	Data link connector (FEN terminal)	Buzzer not sounded	B+	With System Selector test switch at "SELF-TEST"
1F	—	—	—	—	—
1G	Output	Ignition control module	Ignition switch ON	Approx. 0V	—
1G	Output	Ignition control module	Idle	Approx. 0.6V	—
1H	Output	Headlight switch	Head light ON	B+	—
1H	Output	Headlight switch	Head light OFF	0V	—
1I	Input	Data link connector (TEN terminal)	System Selector test switch at "O2 MONITOR"	B+	With Self-Diagnosis Checker and System Selector
1I	Input	Data link connector (TEN terminal)	System Selector test switch at "SELF-TEST"	Below 1.0V	With Self-Diagnosis Checker and System Selector
1J	Output	Rear window defroster relay	Rear window defroster switch ON	Below 1.5V	Ignition switch ON
1J	Output	Rear window defroster relay	Rear window defroster switch OFF	B+	Ignition switch ON
1K	Output	TCM	Engine coolant temperature below 60°C (140°F)	Below 1.0V	Ignition switch ON
1K	Output	TCM	Engine coolant temperature above 60°C (140°F)	B+	Ignition switch ON
1L	Output	A/C relay	A/C switch ON	Below 2.5V	—
1L	Output	A/C relay	A/C switch OFF	B+	—

Input/OutputInput

Connection toBattery

Test conditionConstant

Correct voltageB+

RemarksFor backup

Input/OutputInput

Connection toMain relay (FUEL INJ relay)

Test conditionIgnition switch OFF

Correct voltage0V

Remarks—

Input/OutputInput

Connection toMain relay (FUEL INJ relay)

Test conditionIgnition switch ON

Correct voltageB+

Remarks—

Input/OutputInput

Connection toIgnition switch (START)

Test conditionWhile cranking

Correct voltage10V

Remarks—

Input/OutputInput

Connection toIgnition switch (START)

Test conditionIgnition switch ON

Correct voltageBelow 1.5V

Remarks—

Input/OutputOutput

Connection toData link connector (MEN terminal)

Test conditionTest switch at "SELF-TEST"; Lamp illuminated for 3 sec. after ignition switch OFF → ON

Correct voltage4.5–5.5V

RemarksWith Self-Diagnosis Checker and System Selector

Input/OutputOutput

Connection toData link connector (MEN terminal)

Test conditionLamp not illuminated after 3 sec.

Correct voltageB+

RemarksWith Self-Diagnosis Checker and System Selector

Input/OutputOutput

Connection toData link connector (MEN terminal)

Test conditionTest switch at "O2 MONITOR" at idle; Monitor lamp illuminated

Correct voltage4.5–5.5V

RemarksWith Self-Diagnosis Checker and System Selector

Input/OutputOutput

Connection toData link connector (MEN terminal)

Test conditionTest switch at "O2 MONITOR" at idle; Monitor lamp not illuminated

Correct voltageB+

RemarksWith Self-Diagnosis Checker and System Selector

Input/OutputOutput

Connection toMalfunction indicator light (MIL)

Test conditionLight illuminated for 3 sec. after ignition switch OFF → ON

Correct voltageBelow 2.5V

RemarksWith System Selector test switch at "SELF-TEST"

Input/OutputOutput

Connection toMalfunction indicator light (MIL)

Test conditionLight not illuminated after 3 sec.

Correct voltageB+

RemarksWith System Selector test switch at "SELF-TEST"

Input/OutputOutput

Connection toMalfunction indicator light (MIL)

Test conditionLight illuminated

Correct voltageBelow 2.5V

RemarksWith System Selector test switch at "SELF-TEST"

Input/OutputOutput

Connection toMalfunction indicator light (MIL)

Test conditionLight not illuminated

Correct voltageB+

RemarksWith System Selector test switch at "SELF-TEST"

Input/OutputOutput

Connection toData link connector (FEN terminal)

Test conditionBuzzer sounded for 3 sec. after ignition switch OFF → ON

Correct voltageBelow 2.5V

RemarksWith Self-Diagnosis Checker and System Selector; With System Selector test switch at "SELF-TEST"

Input/OutputOutput

Connection toData link connector (FEN terminal)

Test conditionBuzzer not sounded after 3 sec.

Correct voltageB+

RemarksWith System Selector test switch at "SELF-TEST"

Input/OutputOutput

Connection toData link connector (FEN terminal)

Test conditionBuzzer sounded

Correct voltageBelow 2.5V

RemarksWith System Selector test switch at "SELF-TEST"

Input/OutputOutput

Connection toData link connector (FEN terminal)

Test conditionBuzzer not sounded

Correct voltageB+

RemarksWith System Selector test switch at "SELF-TEST"

Input/Output—

Connection to—

Test condition—

Correct voltage—

Remarks—

Input/OutputOutput

Connection toIgnition control module

Test conditionIgnition switch ON

Correct voltageApprox. 0V

Remarks—

Input/OutputOutput

Connection toIgnition control module

Test conditionIdle

Correct voltageApprox. 0.6V

Remarks—

Input/OutputOutput

Connection toHeadlight switch

Test conditionHead light ON

Correct voltageB+

Remarks—

Input/OutputOutput

Connection toHeadlight switch

Test conditionHead light OFF

Correct voltage0V

Remarks—

Input/OutputInput

Connection toData link connector (TEN terminal)

Test conditionSystem Selector test switch at "O2 MONITOR"

Correct voltageB+

RemarksWith Self-Diagnosis Checker and System Selector

Input/OutputInput

Connection toData link connector (TEN terminal)

Test conditionSystem Selector test switch at "SELF-TEST"

Correct voltageBelow 1.0V

RemarksWith Self-Diagnosis Checker and System Selector

Input/OutputOutput

Connection toRear window defroster relay

Test conditionRear window defroster switch ON

Correct voltageBelow 1.5V

RemarksIgnition switch ON

Input/OutputOutput

Connection toRear window defroster relay

Test conditionRear window defroster switch OFF

Correct voltageB+

RemarksIgnition switch ON

Input/OutputOutput

Connection toTCM

Test conditionEngine coolant temperature below 60°C (140°F)

Correct voltageBelow 1.0V

RemarksIgnition switch ON

Input/OutputOutput

Connection toTCM

Test conditionEngine coolant temperature above 60°C (140°F)

Correct voltageB+

RemarksIgnition switch ON

Input/OutputOutput

Connection toA/C relay

Test conditionA/C switch ON

Correct voltageBelow 2.5V

Remarks—

Input/OutputOutput

Connection toA/C relay

Test conditionA/C switch OFF

Correct voltageB+

Remarks—

Terminal voltage — terminals 1M–2F

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

Input/OutputInput

Connection toVehicle speed sensor

Test conditionIgnition switch ON

Correct voltage0V or approx. 5.0V

Remarks—

Input/OutputInput

Connection toVehicle speed sensor

Test conditionDriving

Correct voltageApprox. 2.5V

Remarks—

Input/OutputInput

Connection toP/S pressure switch

Test conditionIgnition switch ON

Correct voltageB+

Remarks—

Input/OutputInput

Connection toP/S pressure switch

Test conditionP/S ON at idle

Correct voltageBelow 1.0V

Remarks—

Input/OutputInput

Connection toP/S pressure switch

Test conditionP/S OFF at idle

Correct voltageB+

Remarks—

Input/OutputOutput

Connection toA/C switch

Test conditionA/C switch ON

Correct voltage1.5–3.5V

RemarksIgnition switch ON and blower motor ON

Input/OutputOutput

Connection toA/C switch

Test conditionA/C switch OFF

Correct voltage4.5–5.5V

RemarksIgnition switch ON and blower motor ON

Input/OutputInput

Connection toFan switch

Test conditionFan speed control 1st position or fan switch OFF

Correct voltageBelow 1.0V

RemarksIgnition switch ON and blower motor ON

Input/OutputInput

Connection toFan switch

Test conditionFan speed control 2nd–4th position

Correct voltageB+

RemarksIgnition switch ON and blower motor ON

Input/OutputInput

Connection toBrake switch

Test conditionBrake pedal released

Correct voltageBelow 1.0V

Remarks—

Input/OutputInput

Connection toBrake switch

Test conditionBrake pedal depressed

Correct voltageB+

Remarks—

Input/OutputInput

Connection toNeutral/clutch switch (MTX)

Test conditionNeutral position or clutch pedal depressed

Correct voltageBelow 1.0V

Remarks—

Input/OutputInput

Connection toNeutral/clutch switch (MTX)

Test conditionOthers

Correct voltageB+

Remarks—

Input/OutputInput

Connection toTCM (ATX)

Test conditionN or P range

Correct voltageBelow 1.0V

Remarks—

Input/OutputInput

Connection toTCM (ATX)

Test conditionOthers

Correct voltageB+

Remarks—

Input/OutputOutput

Connection toTCM (ATX)

Test conditionAt shifting

Correct voltageApprox. 0.5V

Remarks—

Input/OutputOutput

Connection toTCM (ATX)

Test conditionOthers

Correct voltageB+

Remarks—

Input/OutputInput

Connection toThrottle position sensor (Closed throttle position switch)

Test conditionAccelerator pedal released

Correct voltageBelow 1.0V

RemarksIgnition switch ON

Input/OutputInput

Connection toThrottle position sensor (Closed throttle position switch)

Test conditionAccelerator pedal depressed

Correct voltageB+

RemarksIgnition switch ON

Input/Output—

Connection toGround (MTX)

Test conditionConstant

Correct voltage0V

Remarks—

Input/OutputOutput

Connection toTCM (ATX)

Test conditionAt shifting

Correct voltage0V

Remarks—

Input/OutputOutput

Connection toTCM (ATX)

Test conditionOthers

Correct voltageB+

Remarks—

Input/Output—

Connection to—

Test condition—

Correct voltage—

Remarks—

Input/OutputInput

Connection toVolume air flow sensor

Test conditionIgnition switch ON

Correct voltageApprox. 4V

Remarks—

Input/OutputInput

Connection toVolume air flow sensor

Test conditionIdle

Correct voltageApprox. 2.6V

Remarks—

Input/OutputInput

Connection toHeated oxygen sensor (RH)

Test conditionIgnition switch ON

Correct voltage0V

Remarks—

Input/OutputInput

Connection toHeated oxygen sensor (RH)

Test conditionIdle (after warm-up)

Correct voltage0V

Remarks—

Input/OutputInput

Connection toHeated oxygen sensor (LH)

Test conditionIncreasing engine speed (After warm-up)

Correct voltage0–[?]V

Remarks—

Input/OutputInput

Connection toHeated oxygen sensor (LH)

Test conditionDeceleration

Correct voltage0–0.4V

Remarks—

Input/OutputInput

Connection toEngine coolant temperature sensor

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

Correct voltageApprox. 3.1V

RemarksIgnition switch ON

Input/OutputInput

Connection toEngine coolant temperature sensor

Test conditionAfter warm-up

Correct voltageApprox. 0.9V

RemarksIgnition switch ON

Input/OutputInput

Connection toThrottle position sensor

Test conditionClosed throttle position

Correct voltage0.1–1.1V

RemarksIgnition switch ON

Input/OutputInput

Connection toThrottle position sensor

Test conditionWide open throttle

Correct voltage2.8–4.5V

RemarksIgnition switch ON

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Terminal Voltage

B-2