check engine TOYOTA SEQUOIA 2001 Service Repair Manual

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

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1617
1811 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Reconnect the C5 and C6 connectors.
(d) Measure the voltage of each terminal of the wire harness side connector.
Standard:
Terminals No.Wiring ColorTerminal DescriptionConditionSpecified Condition
C5±1 ± Body groundR±B ± Body
groundParking brake signalParking brake warning light ON6.7 to 12 V
C5±1 ± Body groundR±B ± Body
groundParking brake signalParking brake warning light OFFBelow 1 V
C5±2 ± Body groundLG±R ± Body
groundCRUISE signalCRUISE indicator light ONBelow 1 V
C5±2 ± Body groundLG±R ± Body
groundCRUISE signalCRUISE indicator light OFF10 to 14 V
C5±3 ± Body groundB ± Body groundIgnition switch signal
(Start)Ignition switch OFFBelow 1 V
C5±3 ± Body groundB ± Body groundIgnition switch signal
(Start)Ignition switch START10 to 14 V
C5±4 ± Body groundG±Y ± Body
groundSeat belt condition signal
(Driver side)D±BELT indicator light ONBelow 1 V
C5±4 ± Body groundG±Y ± Body
groundSeat belt condition signal
(Driver side)D±BELT indicator light OFF10 to 14 V
C5±13 ± Body groundLG±R ± Body
groundWasher level signalWASH LVL indicator light ONBelow 1 V
C5±13 ± Body groundLG±R ± Body
groundWasher level signalWASH LVL indicator light OFF10 to 14 V
C5±14 ± Body groundL±O ± Body
groundO/D OFF indicator signalO/D OFF indicator light ONBelow 1 V
C5±14 ± Body groundL±O ± Body
groundO/D OFF indicator signalO/D OFF indicator light OFF10 to 14 V
C5±15 (*1) ± Body groundY±R ± Body
groundA/T oil temperature signalA/T OIL TEMP. warning light ONBelow 1 V
C5±15 (*1) ± Body groundY±R ± Body
groundA/T oil temperature signalA/T OIL TEMP. warning light OFF10 to 14 V
C5±16 ± Body groundLG±B ± Body
groundSecurity indicator light
signal (Engine immobilizer
system)
Security indicator light ON10 to 14 V
C5±16 ± Body groundLG±B ± Body
groundSecurity indicator light
signal (Engine immobilizer
system)
Security indicator light OFFBelow 1 V
C5±17 ± Body groundGR ± Body
groundSecurity indicator light
signal (Theft deterrent
system)
Security indicator light ON10 to 14 V
C5±17 ± Body groundGR ± Body
groundSecurity indicator light
signal (Theft deterrent
system)
Security indicator light OFFBelow 1 V
C5±18 ± Body groundV±W ± Body
groundCHECK ENGINE signalCHECK ENGINE warning light ONBelow 1 V
C5±18 ± Body groundV±W ± Body
groundCHECK ENGINE signalCHECK ENGINE warning light OFF10 to 14 V
C5±19 ± Body groundG±B ± Body
groundA/T shift position signal
(L)A/T L indicator OFFBelow 1 V

DI±1630
± DIAGNOSTICSCOMBINATION METER SYSTEM
1824 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check fuse.
CHECK:
Measure the resistance of the IGN2 fuse and IGN1 fuse in the instrument panel J/B.
OK:
Below 1 W
CHECK:
Measure the resistance of the STA fuse in the engine room R/B.
OK:
Below 1 W
CHECK:
Measure the resistance of the ECU±B fuse and AM2 fuse in the engine room R/B.
OK:
Below 1 W
NG Inspect for short circuit in harness and all com-
ponents connected to fuse.
OK

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1637
1831 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 3 when not using the
hand±held tester.
1 Perform active test by hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON, and push the hand±held tester main switch ON.
CHECK:
From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
TACHOMETER0 rpm / 1,000 rpm / 2,000 rpm / 3,000 rpm / 4,000
rpm / 5,000 rpm / 6,000 rpm / 7,000 rpmConfirm that the vehicle is stopped and engine is
idling.
OK:
Tachometer readings change according to hand±held tester operation.
NG Replace combination meter
(See page IN±35).
OK
2 Read value of hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
Operate the hand±held tester according to the steps on the display and select ºDATA LISTº.
METER:
ItemMeasurement Item/
Range (Display)Normal ConditionDiagnostic Note
TACHO METEREngine RPM /
Min.: 0 rpm Max.: 12,750 rpmAlmost the same as actual engine
speed (When engine is running)
OK:
Engine speed displayed on the tester is almost the same as the actual engine speed.
OK Replace combination meter
(See page IN±35).
NG

I28571
C5±23
Combination Meter:
I28567
GND
DI±1638
± DIAGNOSTICSCOMBINATION METER SYSTEM
1832 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect combination meter.
PREPARATION:
(a) Check the input signal waveform.
(1) Remove the combination meter with the connectors
connected.
(2) Connect the oscilloscope to terminal C5±23 and
body ground.
(3) Start the engine.
CHECK:
Check signal waveform according to the condition(s) in the
table below.
ItemCondition
Tool setting5 V/DIV, 10 ms/DIV
Vehicle conditionEngine idle speed
OK:
Waveform appears as shown in the illustration.
HINT:
As engine speed increases, the cycle of the signal waveform
narrows.
OK Replace combination meter
(See page IN±35).
NG

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1641
1835 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 3 when not using the
hand±held tester.
1 Perform active test by hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
FUEL GAUGEEMPTY, 1/2, FULLConfirm that the vehicle is stopped and engine is
idling.
OK:
Fuel receiver gauge readings change according to hand±held tester operation.
NG Replace combination meter
(See page IN±24).
OK
2 Read value of hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
Operate the hand±held tester according to the steps on the display and select ºDATA LISTº.
METER:
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
FUEL GAUGEFuel Input /
Min.: 0 Max.: 255Tester indication changes accord-
ing to the fuel receiver gauge
angle.

OK:
Fuel value signal displayed on the tester is almost the same as the needle indication.
NG Replace combination meter
(See page IN±24).
OK

DI±1644
± DIAGNOSTICSCOMBINATION METER SYSTEM
1838 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in engine coolant temperature receiver gauge
CIRCUIT DESCRIPTION
The ECM receives an engine coolant temperature signal from the engine coolant temperature sensor and
sends it to the A/C ECU.
The combination meter receives the signal from the A/C ECU through multiplex communication. Therefore,
if a malfunction occurs in the engine coolant temperature receiver gauge, there may be a malfunction in the
multiplex communication system, air conditioning system, or engine system.
(Multiplex communication system: See page DI±1892)
(Air conditioning system: See page DI±2301)
(Engine system: See page DI±9)
INSPECTION PROCEDURE
1 Perform active test by hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
COOLANT TEMPHIGH / NORMAL / LOW (OFF)Confirm that the vehicle is stopped and engine is
idling.
OK:
Engine coolant temperature receiver gauge readings change according to hand±held tester op-
eration.
OK Go to engine system or air conditioning system
(See page DI±9 or DI±2301).
NG
Replace combination meter
(See page IN±35).
DID92±01