1kz Toyota Engine Iat Sensor

Ecu For 1kz

Electronic Controlled Unit (ECU)

INSPECTION OF ECU

1. MEASURE VOLTAGE OF ECU

NOTE: The EFI circuit can be checked by measuring the resistance and voltage at the wiring connectors of the ECU.

Check the voltages at the wiring connectors.

• Turn on the ignition switch.

• Measure the voltage at each terminal.

NOTE: 1. Perform all voltage measurements with the connectors connected.

2. Verify that the battery voltage is 11V or above when the ignition switch is ON.

Connectors of ECU

Symbol

Terminal Name

Symbol

Terminal Name

Symbol

Terminal Name

Eoi

ENGINE GROUND

ENGINE REVOLUTION SENSOR

A/C

A/C MAGNET SWITCH

E02

ENGINE GROUND

VF

CHECK CONNECTOR

SPD

SPEEDOMETER

No. 10

INJECTOR

G

ENGINE REVOLUTION SENSOR

W

WARNING LIGHT

No. 20

INJECTOR

T

CHECK CONNECTOR

THA

AIR TEMP. SENSOR

STA

STARTER SWITCH

VTA

THROTTLE SWITCH

Vs

AIR FLOW METER

IGt

IGNITER

Ne

ENGINE REVOLUTION SENSOR

Vc

AIR FLOW METER

EGR

EGR VSV

IDL

THROTTLE SWITCH

BAT

BATTERY +B

ENGINE GROUND

KNK

KNOCK SENSOR

IG S/W

IGNITION SWITCH

N/C

NEUTRAL START SWITCH |A/T>

IGf

IGNITER

+ 8

MAIN RELAY

CLUTCH SWITCH <M/T»

Ox

OXYGEN SENSOR

TCD

ECT COMPUTER

ISCt

ISC MOTOR NO. 1 COIL

THW

WATER TEMP. SENSOR

OIL

OIL PRESSURE SWITCH

ISC 2

ISC MOTOR NO. 2 COIL

E?

SENSOR EARTH

Li

ECT COMPUTER

ISC 3

ISC MOTOR NO. 3 COIL

Ei

ENGINE GROUND

ll

ECT COMPUTER

ISC«

ISC MOTOR NO. 4 COIL

M-REL

MAIN RELAY COIL

Ls

ECT COMPUTER

I l—J 1 1 '-» 1

---

E„,

No. 10

STA

EGR

N/C

ISC 1

ISC 2

G

H*

IGf

THW

L.

Lj

M-REL

SPD

THA

Vj

Vc

BAT

E.s

No. 20

IG!

E,

ISC 3

ISC 4

VF

T

VTA

IDL

KNK

0*

E,

E,

E.

TCO

A/C

W

OIL

♦ 8

Terminals

STD Voltage

Condition

BAT - Ei

10 - 14

+ B - Ei

IG SAV ON

IG S/W - Ei

M-REL - Ei

IDL - E?

4-6

Throttle valve open

VTA - Es

0.1 - 1.0

IG SAV ON

Throttle valve fully closed

4-5

Throttle valve fully opened

Vc - Ei

4-6

Vs - Ez

4-5

Measuring plate fully closed

0.02 - 0.08

Measuring plate fully open

2-4

Idling

0.3 - 1.0

3,000 rpm

THA - E2

1 - 2

IG S/W ON

Intake air temperature 20°C (68°F)

THW - Ei

0.1 - 0.5

Coolant temperature 80°C <176°F)

STA - Ei

6-12

IG S/W ST position

No. 10 No. 20 "

9-14

IG S/W ON

IGt - Ei

0.7 - 1.0

Cranking or Idling

ISCi

ISC4

9-14

IG SAN ON

9-14

2 — 3 secs, after engine off

+ B - EGR

10 - 13

IG S/W ON

0

Start engine and warm up oxygen sensor

N/C - Ei

0

IG SAV ON

Shift position P or N range (for A/T)

10 - 14

Ex. P or N range (for A/T)

0

Clutch pedal not depressed (for M/T)

10 - 14

Clutch pedal depressed (for M/T)

9-11

Cranking

T - Ei

4-6

IG S/W ON

Check connector not short

0

Ch8ck connector short

OIL - Ei

4-6

IG SAW ON {Warning light on)

0

Start engine (Warning light out)

A/C - Ei

10 - 13

IG S/W ON

A/C SAV ON

0

A/C S/W OFF

Vf - Ei

0-5

Start engine (Throttle valve open)

W - Ei

0

IG S/W ON

10 - 13

Start engine

TCD - Ei

2-3

IG SAV ON

Coolant temperature Less than 35°C (95°F)

0

Coolant temperature 35 - 60°C (95 - 140°F)

4-6

Coolant temperature More than 60°C (140°F)

2. MEASURE RESISTANCE OF ECU CAUTION:

1. Do not touch the ECU terminals.

2. The tester probe should be inserted into wiring connector from wiring side.

Check the resistance between each terminal of the wiring connector.

• Unplug the wiring connectors from the ECU.

• Measure the resistance between each terminal of the wiring connectors.

Resistances at ECU Wiring Connectors

Terminals

Condition

Resistance (0)

IDL - E 2

Throttle valve open

00

Throttle valve fully closed

0

VTA - Ei

Throttle valve fully opened

3.300 - 10.000

Throttle valve fully closed

200 - 800

Vc - Ei

Disconnect air flow meter connector

3,000 - 7,000

Disconnect throttle position sensor connector

200 - 400

Vs - E2

Measuring plate fully closed

20 - 400

Measuring plate fully open

20 - 1000

THA - Eî

Intake air temperature 20°C I68°F|

2,000 - 3,000

G - G ©

140 - 180

Ne - G ©

iSCi. ISC2 iSCa. ISC«

10 - 30

Ohrometer ECU Connector

Ohrometer ECU Connector

Fuel Cut RPM

INSPECTION OF FUEL CUT RPM

(a) Start and warm up the engine.

(b) Disconnect the throttle position sensor connector from the throttle position sensor.

(c) Short circuit terminals E2 and IDL on wire connector side.

(d) Gradually raise the engine rpm and check that there is fluction between the fuel cut and fuel return points.

NOTE: The vehicle should be stopped.

Fuel Cut rpm

Fuel Return rpm

1,800 rpm

1,200 rpm

Start Injector Time Switch

Lambang Relay Mk2Which Sta Stj Switch Toyota

INSPECTION OF START INJECTOR TIME SWITCH

MEASURE RESISTANCE OF START INJECTOR TIME SWITCH

(a) Disconnect the connector.

(b) Using an ohmmeter, measure the resistance between each terminal.

Between terminals

Resistance <0)

Coolant temperature

STA - STJ

24 - 40

below 30°C I86°F)

40-60

above 40°C <104">F)

STA - Ground

20 - 80

-

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