Pim E Vcc E

No.

Terminals

Trouble

Condition

STD voltage

5

No.lQ EC1 Mo. 20 EÛ2

No voltage

IG SW ON

10-14V

(1) There is no voltage between ECU terminals No.10 and/or No.20 and E01 and/or E02. (IG SW ON)

No.

Terminals

Trouble

Condition

STD voltage

6

THA- E2

No voltage

IG SW ON

Intake air temperature 20°C (68°F)

Incake Air Temp. Sensor

Ûhmmeier /f.
Toyota Thw

No.

Terminals

Trouble

Condition

STD voltage

7

THW■ ea

No voltage

IG SW ON

Coolant temperature 80°C (176°F)

WHtar T«np. Sensor

Engine tCU

Y El

Ohmmeter

Water Tcftvp. SanK

Ohmmeter

Water Tcftvp. SanK

(1) There is no voltage between ECU terminals THW and E2. (IG SW ON)

(2) Check that there is voltage between ECU terminal + B or + B1 and body ground. (IS SW ON)

Terminals

Trouble

No voltage

Condition

Cranking

STD voltage b-14 V

Meutrül S[i»it switch (a/t)

i HO

Engine ECU

Clvtvh Slsrt Swiuch (M/T)

Engine ECU

Clvtvh Slsrt Swiuch (M/T)

fiaim

No.

Terminals

Trouble

Condition

STD voltage

IGT - El

No voltage

Idling

0.7 - 1.0 V

Igmtion SwFtíh AM2.

H-Fusa AM2 3QA

MAIN 2.OL

Battery

Engine ECU

J

IGT IGF

El

Ohmmeler on

1

Tisril

r i

mm™

J

Hm- - )

(1) There is no voltage between ECU terminals IGT and E1. (Idiling)

(2) Check that there is voltage between ECU terminal IGT and body ground. (Idiling)

NO

OK

Check wiring between ECU

BAD

Repair or

terminal E1 and body ground.

replace.

1

Check igniter. (See page IG-14)

--K

Repair or replace.

No.

Terminals

Trouble

Condition

STD voltage

10

W - El

No voltage

No trouble ("CHECK" engine warning light off) and engine running

10-Î4 V

To Igrtilkin SwftCtl ILM )-

"CHECK' Engine Warning Lighl

Futfc

GAUGE

"CHECK' Engine Warning Lighl

CtKnbinalitjn Met«

Engine ECU

'W

>E1

Repair or replace.

Fuse blows again

Check wiring between ECU

BAD

terminal W and fuse.

Repair or replace

Terminals

Trouble

No voltage

Condition

Air conditioning ON

STD voltage a -14 V

To A/C Amplifier

a/c cijmprrjespr

OA/C

(1) There is no voltage between ECU terminals A/C and E1. (Air conditioning ON)

(2) Check that there is voltage between ECU terminal A/C and body ground.

(2) Check that there is voltage between ECU terminal A/C and body ground.

CNrtüh Conn«1or

Osryacn Stiriaur

iVvV

OjfVBfl" Sffnsor Hçftlflr

Engina ECU

Toyota Voltage

Chack Connector Et TE1

vflijjö

Votfnieier

(j) There is no voltage between ECU terminals VF and E1.

Check that there is voltage between ECU terminal VF and body ground.

Check wiring between ECU terminal E1 and body ground.

Try another ECU.

Repair or replace.

Is air leaking into air induction system? - ^Repair air leak

Check spark plugs. (See page IG-7)

Repair or replace.

Check spark plugs. (See page IG-7)

Repair or replace.

Check distributor and ignition system.

BAD

Repair or replace.

(See page IG-4)

OK

BAD

Check fuel pressure. (See page FI-105)

Repair or replace. '

t OK

BAD

Check injectors. (See page FI-138)

Repair or replace.

rOK

BAD

Check vacuum sensor. (See page FI-113)

Repair or replace.

, OK

(2) Check operation of oxygen sensor. (See page FI-214)

OK ——p-

System Normal

BAD

Check wiring between oxygen sensor and

BAD

Repair wiring.

ECU.

ok

Replace oxygen sensor.

EG R

EGR Gia Tamp. Ssnsor

"If tnyrne ECU

flTHG

0hmm6taT ®

0hmm6taT ®

(1) There is no voltage between ECU terminals ThIG and E2. (IG SW ON)

(2) Check that there is voltage between ECU terminal + B or + B1 and body ground. (IG SW ON)

Check wiring between ECU terminal E1 and body ground.

Repair or replace.

Check (See p

EGR system. age EC-8)

OK

Check senso

EGR gas temp. r. (See page FI-213)

Repair or replace.

Replace EGR gas temp. sensor.

Check wiring between ECU and EGR gas temp. sensor.

Try another ECU.

Repair or replace.

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