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Inspección de ECU

This document provides instructions for inspecting the electronic control diesel engine ECU. It describes removing the ECU from the vehicle and measuring the voltage and resistance of various terminals to check the ECD circuitry. It also provides steps for activating learning using a Toyota hand-held tester after replacing the ECU. Terminals are listed with their standard resistance ranges.

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Adanaque Villacorta Jd
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160 views2 pages

Inspección de ECU

This document provides instructions for inspecting the electronic control diesel engine ECU. It describes removing the ECU from the vehicle and measuring the voltage and resistance of various terminals to check the ECD circuitry. It also provides steps for activating learning using a Toyota hand-held tester after replacing the ECU. Terminals are listed with their standard resistance ranges.

Uploaded by

Adanaque Villacorta Jd
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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ED−17

ELECTRONIC CONTROL DIESEL − ENGINE ECU


ED068−01

INSPECTION
HINT:
The ECD circuit can be checked by measuring the resistance
and voltage at the wiring connectors of the engine ECU.
1. REMOVE ENGINE ECU FROM VEHICLE BODY
2. INSPECT VOLTAGE OF ENGINE ECU
(See page DI−15)

3. INSPECT RESISTANCE OF ECD CIRCUITRY


(a) Turn the ignition switch OFF.
(b) Disconnect the 4 connectors from the engine ECU.
Ohmmeter (c) Measure the resistance between each terminal of the wir-
ing connectors.
NOTICE:
S Do not touch the engine ECU terminals.
S The tester probe should be inserted in the wiring con-
BR1333 nector from the wiring side.

Terminals Condition STD resistance (W)


THW − ETHW Water temp. 20˚C (68˚F) 2.6 − 2.29 k
G+ − G− Cold (−10˚C (14˚F) to 50˚C (122˚F)) 1630 − 2740
Hot (50˚C (122˚F) to 100˚C (212˚F)) 2065 − 3225
NE+ − NE− Cold (−10˚C (14˚F) to 50˚C (122˚F)) 1630 − 2740
Hot (50˚C (122˚F) to 100˚C (212˚F)) 2065 − 3225

THAF − ETHAF − 2.0 − 3.0 k


EGR − +B 20˚C (68˚F) 11 − 13
EGRC − +B 20˚C (68˚F) 11− 13
PCV − +B 20˚C (68˚F) 11− 13
PINJ1 − E01 20˚C (68˚F) 30 − 9600
PINJ2 − E01 20˚C (68˚F) 30 − 9600
PINJ3 − E01 20˚C (68˚F) 30 − 9600
PINJ4 − E01 20˚C (68˚F) 30 − 9600
VPC − EPC − −

4. ACTIVATE LEARNING
DIAGNOSTIC MENU
ECD (a) Connect the TOYOTA hand−held tester to the vehicle.
1: DATA LIST (b) Turn ON the TOYOTA hand−held tester.
2: DTC INFO (c) Select ”6: EXCHANGE UTILITY” from [DIAGNOSTIC
3: ACTIVE TEST
4: SNAPSHOT
MENU ECD].
6: EXCHANGE UTILITY

9: FUEL CONSUMPTION
A18477

1ND−TV ENGINE (RM920E)


ED−18
ELECTRONIC CONTROL DIESEL − ENGINE ECU

(d) Select ”4: ACTIVATE LEARNING” on the TOYOTA hand−


EXCHANGE UTILITY held tester.
Please select function (e) Press the ”ENTER” key.
1: INJ CLASS CHANGE
2: RESET LEARNING
3: RESET LEARNING & MILE
4: ACTIVATE LEARNING

[ENTER] or [EXIT]
A18486

(f) Press the ”ENTER” key.


ACTIVATE LEARNING

NOTICE
Do not use this function
unless instructed by repair
manual.
Only use after replacing
the ECU on specified
vehicle.
[ENTER]
A18687

(g) Press the ”YES” key.


ACTIVATE LEARNING

Excuting this function will


activate ECU learning.

Do you wish to continue?

[YES] to continue
[NO] to exit
A18688

(h) Confirm that the TOYOTA hand−held tester displays the


ACTIVATE LEARNING
word ” ACTIVATE LEARNING COMPLETED”.
COMPLETED

Learning was activated


correctly.

[ENTER]
A18689

NOTICE:
ACTIVATE LEARNING
If the TOYOTA hand−held tester displays the illustrated
ACTIVATE REFUSED screen.
− Please confirm availability
Please retry activate learning again after pressing the ”EN-
of this function in vehicle
repair manual. TER” key.
− If function is available,
(i) Perform the ”INJ CLASS CHANGE” to write the injector
please retry. class using TOYOTA hand−held tester (See page
FU−8.).
[ENTER]
A18690

1ND−TV ENGINE (RM920E)

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