2001 TOYOTA HIGHLANDER Service Repair Manual

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Page 2233 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 01-48
- INTRODUCTIONTERMS
48 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U) TCM
Transmission Control ModuleTransmission ECU, ECT ECU
TPThrottle PositionThrottle Position
TRTransmission Rang

Page 2234 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 010QM-01
01-26- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
26 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
Carry out troubleshooting

Page 2235 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-27
27 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 REPAIR
(a) Repair the affected system or part according to the instructions

Page 2236 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual Important Points with Customer Problem Analysis
What ----- Vehicle model, system name
When ----- Date, time, occurrence frequency
Where ----- Road conditions
Under what conditions? ----- Runni

Page 2237 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-29
29 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system

- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-29
29 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system in the HIGHLANDER has various functions.
The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU
memory whenever a malfunction in the signal circuits to the ECU occurs. In a DTC check, a previous
malfunction's DTC can be checked by a technician during troubleshooting.
Another function is the Input Signal Check, which checks if the signals from various switches are sent
to the ECU correctly.
By using these functions, the problem areas can be narrowed down and troubleshooting is more effec-
tive. Diagnostic functions are incorporated in the following systems in the HIGHLANDER:
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Diagnotis Test Mode
(Active Test)
SFI System
(with Check Mode)
ABS with EBD & BA & TRAC & VSC System
Electronic Controlled Automatic Transaxle [ECT]
(with Check Mode)
Air Conditioning System
Supplement Restraint System
Power Window Control System
Power Door Lock Control System
Wireless Door Lock Control System
Engine Immobiliser System
Multiplex Communication System
Cruise Control System
In the DTC check, it is very important to determine whether the problem indicated by the DTC is: 1 still
occurring, or 2 occurred in the past but has since returned to normal. In addition, the DTC should be
compared to the problem symptom to see if they are related. For this reason, DTCs should be checked
before and after confirmation of symptoms (i.e., whether or not problem symptoms exist) to determine
current conditions, as shown in the table below.
Never skip the DTC check. Failure to check DTCs may, depending on the case, result in unnecessary
troubleshooting for systems operating normally or lead to repairs not pertinent to the problem. Follow
the procedures listed above in the correct order.
A flow chart showing how to proceed with troubleshooting using the DTC check is shown below. Direc-
tions from the flow chart will indicate should be performed DTC troubleshooting or to the troubleshoot-
ing of each problem symptom.
1 DTC CHECK
2 MAKE A NOTE OF DTCS DISPLAYED AND THEN CLEAR THE MEMORY
3 SYMPTOM CONFIRMATION
aSymptoms exist
bNo symptoms exist
a Go to step 5

Page 2238 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 01-30- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
30 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
b
4 SIMULATION TEST USING THE SYMPTOM SIMULATION METHODS
5 DTC CHECK
aDTC dis

Page 2239 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual B71602
Vibrate Slightly
Shake Slightly
Vibrate
Slightly
D25084
Malfunction
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-31
31 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SY

B71602
Vibrate Slightly
Shake Slightly
Vibrate
Slightly
D25084
Malfunction
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-31
31 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no problem symptoms occur. In such cases, a thorough
customer problem analysis must be carried out. A simulation of the same or similar conditions and environ-
ment in which the problem occurred in the customer's vehicle should be carried out. No matter how much
skill or experience a technician has, troubleshooting without confirming the problem symptoms will lead to
important repairs being overlooked and mistakes or delays.
For example:
With a problem that only occurs when the engine is cold or occurs as a result of vibration caused by the road
during driving, the problem can never be determined if the symptoms are being checked on a stationary ve-
hicle or a vehicle with a warmed-up engine.
Vibration, heat or water penetration (moisture) is difficult to reproduce. The symptom simulation tests below
are effective substitutes for the conditions and can be applied on a stationary vehicle.
Important points in the symptom simulation test:
In the symptom simulation test, the problem symptoms as well as the problem area or parts must be con-
firmed. First, narrow down the possible problem circuits according to the symptoms. Then, connect the tester
and carry out the symptom simulation test, judging whether the circuit being tested is defective or normal.
Also, confirm the problem symptoms at the same time. Refer to the problem symptoms table for each system
to narrow down the possible causes.
1. VIBRATION METHOD: When vibration seems to be
the major cause.
(a) PART AND SENSOR
(1) Apply slight vibration with a finger to the part of the
sensor considered to be the cause of the problem
and check whether or not the malfunction occurs.
HINT:
Applying strong vibration to relays may open relays.
(b) CONNECTORS
(1) Slightly shake the connector vertically and horizon-
tally.
(c) WIRE HARNESS
(1) Slightly shake the wire harness vertically and hori-
zontally.
The connector joint and fulcrum of the vibration are
the major areas that should be checked thoroughly.
2. HEAT METHOD: If the problem seems to occur when
the area in question is heated.
(a) Heat the component that is the possible cause of the mal-
function with a hair dryer or similar device. Check if the
malfunction occurs.
NOTICE:
Do not heat to more than 60C (140F). Exceeding this
temperature may damage components.
Do not apply heat directly to the parts in the ECU.

Page 2240 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual D25085
B02389
ON 01-32
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
32 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3. WATER SPRINKLING METHOD: When the malfunc-
tion seems to

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