2001 TOYOTA SEQUOIA check engine

DI±1592
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1786 Author: Date:
2005 SEQUOIA (RM1146U)
Code 31, 35, 36 or 37 is output.
CIRCUIT DESCRIPTION
These DTCs are indicated when an unregistered key is inserted. When any of them is indicated, clear the
DTC and insert other registed keys to check for DTCs.
When a key that outputs a DTC (31, 35, 36 or 37) is found, register this key. When a DTC (31, 35, 36 or 37)
is not output, there is a possibility that the unregistered key has been inserted before. (The ECM is normal.)
Ask the customer under what conditions the problem occurred to find the cause.
(Example: Another key has been inserted, etc.)
DTC No.DTC Detecting ConditionTrouble Area
31, 35, 36, 37Unmatched key codeKey
INSPECTION PROCEDURE
1 Delete DTC and insert all the presently available keys to check whether the en-
gine starts or not (See page DI±1576).
HINT:
When inserting a key that does not start the engine, a DTC (31, 35, 36 or 37) is stored in memory.
RESULT:
OKAll keys start the engine.
NGA specific key does not start the engine.
OK No problem.
HINT:
If the result is ºOKº, confirm whether or not the customer ever
inserted an unregistered key or the immobiliser key (with a
transponder chip) of another vehicle into the ignition key cylin-
der, and find out the cause of the detection of the DTC.
NG
Register the key that does not start the en-
gine
(See page BE±137).
DIABH±04

DI±1594
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1788 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check whether the engine can be started with a spare key of the same vehicle.
YES Replace key.
NO
2 Check harness and connector between transponder key ECU and ECM (See
page IN±35).
NG Repair or replace harness or connector.
OK
3 Does the system operate normally after replacement of transponder key ECU?
YES Replace transponder key ECU.
NO
Replace ECM (See page IN±35).

DI±1596
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1790 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check ECU±B fuse.
CHECK:
Check for continuity of the ECU±B fuse.
OK:
Continuity
NG Replace fuse.
OK
2 Check voltage between terminals +B and GND of transponder key ECU connec-
tor.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the transponder key ECU connector.
CHECK:
Measure the voltage between terminals +B and GND.
OK:
Voltage: 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1573).
NG
3 Check wire harness and connector between terminal GND of transponder key
ECU and body ground (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Check and repair wire harness and connec-
tor between transponder key ECU and bat-
tery.

I24836
ON
IND
(±) (+)
DI±1598
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1792 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminal IND of transponder key ECU connector and
body ground.
PREPARATION:
Turn the ignition switch to the ON position and enter diagnosis
mode.
CHECK:
Measure the voltage between terminal IND of the transponder
key ECU connector and body ground when the security indica-
tor light is on and when it is off.
OK:
Indicator lightVoltage
ON3 to 6 V
OFFBelow 1 V
NG Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1573).
OK
2 Check combination meter (See page DI±1610).
NG Replace combination meter.
OK
Check and replace wire harness and connec-
tor (See page IN±35).

A04550
CGOP3
1 234 5 678
91011 13 151612 14
DI±1600
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1794 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals OP3 and CG of DLC3.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals OP3 and CG of the
DLC3.
OK:
Voltage: 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1573).
NG
2 Check harness and connector between transponder key ECU and DLC3, DLC3
and body ground (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace transponder key ECU
(See page IN±35).

DID8Q±01
DI±1608
± DIAGNOSTICSCOMBINATION METER SYSTEM
1802 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. METER GAUGE AND WARNING/INDICATOR
GAUGE:
ItemDetail
SpeedometerVehicle speed sensor (Direct line).
TachometerECM transmits engine speed to the meter to display.
ODO/TRIP MeterCombination meter assy.
FuelDisplays a fuel level according to a signal from the fuel sender gauge (Direct line).
Water TemperatureDisplays engine coolant temperature according to a signal from the ECM (BEAN).
Oil PressureReceives a signal from the oil pressure sender (Direct line).
Volt MeterDisplays vehicle voltage according to a voltage from the IG terminal (Direct line).
WARNING/INDICATOR:
HINT:
Combination meter bulb check is performed for 3 seconds after the ignition switch is turned ON.
ItemDetailList of indicators available for
bulb check
O/D OFFReceives a signal from the ECM (Direct line)±
TURNTurns signal switch ON (Direct line)±
BEAMReceives a signal from the body ECU (*1), Displays a signal received from the
dimmer switch (*2) (Direct line)±
SECURITYReceives a set signal from the transponder key ECU and body ECU (Direct line)±
CHARGEReceives a malfunction signal from the alternator (Direct line)
AIR BAGReceives a malfunction signal from the airbag sensor center (Direct line)
D SEAT BELTReceives the driver seat belt signal (Unfastened) from the seat belt inner front LH
(Direct line)±
DOOROpen door indicator comes on when a signal is received from the ECU (BEAN)
from each door±
A/T OIL TEMP.Warning is displayed when the oil temperature is high (Direct line)
BRAKEComes on when the parking brake switch is on or the brake fluid level warning
switch is on (Direct line)
MIL (CHECK ENGINE)Receives a malfunction signal from the ECM (Direct line)
FUEL WARNINGReceives the fuel empty signal from the fuel sender gauge (Direct line)±
ABSReceives a malfunction signal from the skid control ECU (Direct line)
WASHERWarning is displayed when the washer level is low (Direct line)±
CRUISEReceives a CRUISE on signal or malfunction signal from the ECM (Direct line)±
VSC TRACReceives a malfunction signal from the skid control ECU (Direct line)
VSC (TRAC) OFFReceives a malfunction signal from the translate ECU (Direct line)
SLIPReceives a malfunction signal from the translate ECU (Direct line)
4HIReceives a 4HI signal from the 4WD control ECU (Direct line)±
CTR DIF LOCKReceives a DIF LOCK signal from the 4WD control ECU (Direct line)±
A/T PReceives a P signal from the park/neutral position switch (Direct line)±
A/T NReceives an N signal from the park/neutral position switch (Direct line)±
A/T DReceives a D signal from the park/neutral position switch (Direct line)±
A/T 3Receives a 3 signal from the park/neutral position switch (Direct line)±
A/T 2Receives a 2 signal from the park/neutral position switch (Direct line)±
A/T LReceives an L signal from the park/neutral position switch (Direct line)±

DID8S±01
/ /
/ /
COMBINATION METER SYSTEM Check Sheet
Inspector 's name:
Customer 's NameVIN
Production Date
Licence Plate No.
Date Vehicle
Brought InOdometer Readingkm
miles
Weather Conditions
When Problem
OccurredFrequency Problem Occurs
Weather
Outside temperature Constantly  Sometimes ( times per day, month)
 Once only Date Problem First Occurred
 Fine  Cloudy  Rainy  Snowy
 Various/Others
 Hot  Warm  Cool
 Cold (Approx. 5F ( 5C))
Problem Symptom
Gauge

Malfunction in speedometer

Malfunction in tachometer

Malfunction in engine coolant temperature receiver gauge

Malfunction in fuel receiver gauge

Entire combination meter does not operate

Buzzer does not sound (Key reminder warning, Seat belt warning)

Seat belt warning for driver's seat does not operate
Others

Operating light control rheostat does not change light brightness

















Malfunction in oil pressure receiver gauge

Malfunction in volt meter DI±1612
± DIAGNOSTICSCOMBINATION METER SYSTEM
1806 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK

DID8U±01
DI±1614
± DIAGNOSTICSCOMBINATION METER SYSTEM
1808 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:
Inspect the related ºFuseº and ºRelayº before confirming the suspected area as shown in the table below.
MALFUNCTION SYSTEM:
SymptomSuspected AreaSee page
Entire combination meter does not operate.Refer to troubleshooting proceduresDI±1628
Operating light control rheostat does not change light brightness.Refer to troubleshooting proceduresDI±1645
Seat belt warning does not operate.Refer to troubleshooting proceduresDI±1650
Key reminder warning buzzer does not sound.
1. Multiplex communication system
2. Key unlock warning switch circuit
3. Door courtesy lamp switch circuit
4. Combination meter assyDI±1892
DI±1715
DI±1728
IN±35
METER GAUGES:
SymptomSuspected AreaSee page
Malfunction in speedometerRefer to troubleshooting proceduresDI±1632
Malfunction in tachometerRefer to troubleshooting proceduresDI±1636
Malfunction in fuel receiver gaugeRefer to troubleshooting proceduresDI±1640
Malfunction in engine coolant temperature receiver gaugeRefer to troubleshooting proceduresDI±1644
Malfunction in oil pressure receiver gaugeRefer to troubleshooting proceduresDI±1654
Malfunction in volt meterRefer to troubleshooting proceduresDI±1658
WARNING LIGHTS:
SymptomSuspected AreaSee page
Check engine warning light (MIL) does not come on.
1. ECM
2. Wire harness or connector
3. Combination meter assyDI±9
±
IN±35
Discharge warning light does not come on.
1. ECM
2. Wire harness or connector
3. Combination meter assyDI±9
±
IN±35
Brake warning light does not come on.
1. Skid control ECU
2. Wire harness or connector
3. Combination meter assyDI±895
±
IN±35
ABS warning light does not come on.
1. Skid control ECU
2. Wire harness or connector
3. Combination meter assyDI±895
±
IN±35
SRS warning light does not come on.
1. Airbag sensor assy
2. Wire harness or connector
3. Combination meter assyDI±1126
±
IN±35
Open door warning light does not come on.
1. Door courtesy light switch circuit
2. Wire harness or connector
3. Combination meter assy
4. Body ECUDI±1728
±
IN±35
IN±35
Fuel level warning light does not come on.
1. Refer to troubleshooting
2. Wire harness or connector
3. Combination meter assyDI±1640
±
IN±35
Low oil pressure warning light does not come on.
1. Low oil pressure warning switch
2. Wire harness or connector
3. Combination meter assyBE±55
±
IN±35