Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Tundra 2000-2006 Approved 04-06 techinfo.toyota.com ileaf 06toyrm 06toypdf 06rmsrc 06tundra in httecsy htutdc

<< Back | Home

Most service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.

Image preview - the first page of the document
htutdc

>> Download htutdc documenatation <<

Text preview - extract from the document

IN-30 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
IN05X-32

HOW TO USE THE DIAGNOSTIC
CHART AND INSPECTION
PROCEDURE
1. CONNECTOR CONNECTION AND TERMINAL IN-
SPECTION
S For troubleshooting, diagnostic trouble code (DTC)
charts or problem symptom table are provided for each
FI0046 circuit with detailed inspection procedures in this manual.
S When component parts, wire harnesses and connectors
of each circuit are found to be normal in troubleshooting,
the problem is most likely in the ECU. Accordingly, if diag-
nosis is performed without the problem symptoms occur-
ring, refer to Step 8 to replace the ECU. Always confirm
that the problem symptoms are occurring, or proceed with
inspection while using the symptom simulation method.
S The instructions "Check wire harness and connector" and
"Check and replace ECU" which appear in the inspection
FI0047 procedure are common and applicable to all DTCs. Fol-
low the procedure outlined below whenever these
instructions appear.
OPEN CIRCUIT:
An open circuit could result from a disconnected wire harness,
a faulty contact in the connector, a connector terminal pulled
out, etc.
HINT:
S A wire is rarely broken in its middle. Most problems occur
at the wire ends. Carefully check the connectors of sen-
FI0048 sors and actuators.
S Faulty contacts could be due to rusting, contamination,
and/or deformation of connector terminals. In some
cases: 1) simply disconnecting and reconnecting the con-
nectors will fix the problem, or 2) even though no ab-
normality is found in the wire harness or connector, the
problem disappears after the check (meaning the cause
was most likely in the wire harness or connectors).
SHORT CIRCUIT:
A short circuit could result from contact between the wire har-
ness and the body ground or a short circuiting switch.
HINT:
When there is a short circuit between the wire harness and body
ground, check thoroughly if wire harness is caught in the body
or is clamped properly.
INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED IN-31
SYSTEMS

2. CONNECTOR HANDLING
When inserting tester probes into a connector, insert them from
the rear of the connector. When necessary, use mini test leads.
For water resistant connectors which cannot be accessed from
behind, take good care not to deform the connector terminals.

FI7187

Sensor Side 3. CONTINUITY CHECK (OPEN CIRCUIT CHECK)
ECU Side (a) Disconnect the connectors at both ECU and sensor
sides.
(b) Measure the resistance between the applicable terminals
of the connectors.
Resistance: Below 1
HINT:
Measure the resistance while lightly shaking the wire harness
IN0379 vertically and horizontally.

ECU Side

Sensor Side

IN0378

ECU Side 4. RESISTANCE CHECK (SHORT CIRCUIT CHECK)
(a) Disconnect the connectors on both ends.
(b) Measure the resistance between the applicable terminals
Sensor Side of the connectors and body ground. Be sure to carry out
this check on the connectors on both ends.
Resistance: 10 k or higher
HINT:
Measure the resistance while lightly shaking the wire harness
IN0380 vertically and horizontally.

5. VISUAL CHECK AND CONTACT PRESSURE CHECK
(a) Disconnect the connectors at both ends.
(b) Check for rust or foreign material, etc. in the terminals of
the connectors.
Pull Lightly (c) Check crimped portions for looseness or damage and
check that the terminals are secured in the lock portion.
Looseness of Crimping
HINT:
The terminals should not come out when pulled lightly from the
IN0381 back.
IN-32 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS

(d) Prepare a test male terminal and insert it in the female ter-
minal, then pull it out.
NOTICE:
When testing a gold-plated female terminal, always use a
gold-plated male terminal.
HINT:
If a test terminal is pulled out more easily than others, there may
be poor contact in that section.

Fig. 1 6. CHECK OPEN CIRCUIT
ECU For an open circuit in the wire harness in Fig. 1, perform a conti-
C OPEN B A nuity check (step (a) below) or a voltage check (step (b) below).
Sensor
1 1 1 1
2 2 2 2

Z17004

Fig. 2 (a) Check the continuity.
(1) Disconnect connectors A and C and measure the
resistance between them.
ECU
In the case of Fig. 2:
C A
Sensor B Between terminal 1 of connector A and terminal 1
1 1 1
2 2 2 of connector C 10 k or higher (open)
Between terminal 2 of connector A and terminal 2
of connector C Below 1
Z17005 An open circuit exists in the wire harness between
terminal 1 of A and terminal 1 of C.
Fig. 3 (2) Disconnect connector B and measure the resis-
tance between the connectors.
ECU In the case of Fig. 3:
Between terminal 1 of connector A and terminal 1
Sensor
of connector B1 Below 1
C B2 B1 A Between terminal 1 of connector B2 and terminal 1
1 1 1 1 of connector C 10 k or higher (open)
2 2 2 2 An open circuit exists in the wire harness between
B04722 terminal 1 of B2 and terminal 1 of C.
INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED IN-33
SYSTEMS

Fig. 4 (b) Check the voltage.
In a circuit in which voltage is applied to the ECU connec-
tor terminal, an open circuit can be checked by conduct-
0V 5V ing a voltage check.
Sensor A
C 5V B 5V As shown in Fig. 4, with each connector still con-
1 1 1 nected, measure the voltage between body ground
2 2 2
and terminal 1 of connector A at the ECU 5V output
terminal, terminal 1 of connector B, and terminal 1
Z17007 of connector C (in that order).
Example results:
5V: Between Terminal 1 of connector A and Body Ground
5V: Between Terminal 1 of connector B and Body Ground
0V: Between Terminal 1 of connector C and Body Ground
In the above example, an open circuit is in the wire harness be-
tween terminal 1 of B and terminal 1 of C.

Fig. 5 7. CHECK SHORT CIRCUIT
If the wire harness is shorted (Fig. 5), locate the section by con-
C SHORT B A ducting a resistance check with ground below.
1 1 1
2 2 2

Z17008

Fig. 6 Check the resistance with ground.
(1) Disconnect connectors A and C and measure the
resistance between terminals 1 and 2 of connector
ECU A and body ground.
C B A In the case of Fig. 6:
Sensor
1 1 1 Between terminal 1 of connector A and body
2 2 2
ground Below 1 (short)
Between terminal 2 of connector A and body
Z17009 ground 10 k or higher
A short circuit is between terminal 1 of connector A
and terminal 1 of connector C.
IN-34 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS

Fig. 7 (2) Disconnect connector B and measure the resis-
tance between terminal 1 of connector A and body
ground, and terminal 1 of connector B2 and body
ground.
ECU
C B2 B1 A In the case of Fig. 7:
Sensor
1 1 1 1 Between terminal 1 of connector A and body
2 2 2 2 ground 10 k or higher
Between terminal 1 of connector B2 and body
Z17808 ground Below 1 (short)
A short circuit is between terminal 1 of connector B2
and terminal 1 of connector C.
8. CHECK AND REPLACE ECU
First check the ECU ground circuit. If it is faulty, repair it. If it is
normal, the ECU could be faulty. Replace the ECU with a func-
tioning one and check if the symptoms occur.
If the trouble symptoms stop, replace the ECU.

(1) Measure the resistance between the ECU ground
Example
terminal and the body ground.
Resistance: Below 1
Ground

IN0383

(2) Disconnect the ECU connector. Check for bent
ECU Side
ground terminals (on the ECU side and the wire har-
ness side). Lastly, check the contact pressure.
Ground
W/H Side

Ground
IN0384

◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo