check engine TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±943
1137 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check engine control system.
CHECK:
Check engine control system (See page DI±43).
RESULT:
DTC is not outputA
DTC is outputB
B Repair engine control system according to the
output code (See page DI±58).
A
2 Check DTC of translate ECU.
CHECK:
Check DTC of the translate ECU (See page DI±911).
RESULT:
DTC is output (53, 65, 94)A
DTC is not outputB
B Go to step 4.
A
3 Check for open and short circuit in harness and connector between skid control
ECU and translate ECU (CAN1 circuit).
NG Repair or replace harness or connector
(CAN1 circuit).
OK

F19800
(1): Brake Pedal
Depressed
(2): Brake Pedal
Released Voltage
Time 4.5 V
1.9 V
0.5 V(2)
(1)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±961
1155 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in the case of using the hand±held tester and start from step 2 in the case
of not using the hand±held tester.
1 Check output value of the delta S sensor (pedal stroke speed sensor) using the
hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Run the engine until the engine speed reaches 3,000 rpm, and return it back to idle.
HINT:
Rev up the engine to ensure sufficient vacuum.
(d) Select DATA LIST mode on the hand±held .
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
PEDAL STROKEPedal stroke sensor/
min.: 0 V, max.: 5.1 V
Approximately 2.0 V with-
out the brake pedal de-
pressed.
±
HINT:

The result appears on the tester after some delay because a time lag occurs in measurement with a
hand±held tester.

If a signal from the delta S sensor is sent between sampling, the result does not appear on the tester.
So be sure to perform the measurement 2 or 3 times.
CHECK:
Check that the brake pedal acceleration value of the delta S sensor displayed on the hand±held tester
changes, alternatively increasing the brake pedal stroke.
OK:
The value changes as shown in the illustration on the
left. (The value will return to approximately 2.0 V after
the brake pedal is released.)
HINT:
The maximum voltage depends on pedal stroke speed but
should not exceed 4.5 V or fall below 0.2 V.
OK Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point
calibration (See page DI±897).
NG

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1013
1207 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Normal Code Malfunction in Translate ECU
CIRCUIT DESCRIPTION
If any trouble occurs in the engine control system, the skid control ECU prohibits ABS & VSC control.
DTC No.DTC Detecting ConditionTrouble Area
Normal Code
Conditions 1., 2. or 3. continue for 5 sec. or more:
1. Engine malfunction signal is sent from ECM.
2. Shift malfunction signal is sent from ECM.
3. The shift position is other than P and N, and P range
input voltage is 8 V or more.

ECM circuit

ECM

Brake fluid level

Brake fluid level warning switch circuit

Steering angle sensor

Translate ECU

Skid control ECU

Vehicle CAN

VSC+, VSC± circuit (CAN1 communication system)
INSPECTION PROCEDURE
1 Is DTC output for ECM?
Check DTC on page DI±43.
YES Repair engine control system according to the
output code (See page DI±58).
NO
2 Check the DTC of the ABS and VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
Only DTC ºC1203/53º of the VSC system is outputA
Except DTC ºC1203/53º of the VSC system are outputB
B Repair ABS and VSC control system according
to the code output (See page DI±921).
A
DI6OF±12

DIDI3±01
DTCTrouble Mode
Output fromOutput DTCECM
Communication
Stop ModeTranslate ECU
Communication
Stop ModeSuspension Control
ECU Communication
Stop Mode (*1)
Skid Control
ECU
Translate ECU
Suspension
Control
ECU (*1)
See pageU0100/65
65
94
U0100/65
U0122/67
U0132/71
±
±±± 


±
±


 
DI±1079
DI±1081 DI±1083 
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1067
1261 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
1. COMMUNICATION STOP MODE TABLE
(a) Complete ºCheck CAN Bus Lineº (see page DI±1076) to confirm that there is no malfunction in the CAN
bus line. Select ºBUS CHECKº on the hand±held tester via the CAN VIM (see page DI±1073).
(b) Check the communication stop mode of the ECUs not displayed among the following: ºENGINEº,
ºTRANSLATE ECUº, or ºREAR AIRSUSº.
SymptomInspection ItemSee page
ºENGINEº is not displayed on the hand±held tester via CAN VIM.ECM Communication Stop ModeDI±1079
ºTRANSLATE ECUº is not displayed on the hand±held tester via
CAN VIM.Translate ECU Communication Stop ModeDI±1081
ºREAR AIRSUSº is not displayed on the hand±held tester via
CAN VIM. (*1)Suspension Control ECU Communication Stop ModeDI±1083
HINT:
*1: w/ Air Suspension System
2. DTC COMBINATION TABLE
(a) Perform troubleshooting according to the combination of DTCs output.
HINT:

*1: w/ Air Suspension System

: DTCs that are being output.

±: DTCs that are not being output.

Previous CAN communication system DTCs may be the cause if CAN communication system DTCs
are output and all ECUs connected to the CAN communication system are displayed on the hand±held
tester 's ºBUS CHECKº screen via the CAN VIM.

F19698
ECM
MREL 8
E4 B±W 14
IA4 B±W
B±R12
IA4B±R B±R
B±R J16
J/C
D
DD1
E4
2
E4+B
+B2 Engine Room J/B
EF1 Relay
2
2H
6
2H1
2D
1
2F 3
25
1B
W±B
W±B
W±B7
E8E01
EB
EDJ5
J/C A F10
FL Block
B
4
5 B
BatteryEF1 No.1
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1079
1273 Author: Date:
2005 SEQUOIA (RM1146U)
ECM Communication Stop Mode
MODE DESCRIPTION
Detection ItemSymptomTrouble Area
ECM Communica-
tion Stop Mode

ºENGINEº is not displayed on the ºBUS CHECKº screen
of the hand±held tester.

DTCs are output from each ECU in ECM communication
stop mode as shown in the ºDTC COMBINATION TABLEº
(see page DI±1067).

Power source or inside the ECM
WIRING DIAGRAM
DIDI9±01

F19704
Translate ECU
ENG+
ENG±14
T5
16
T5R
W1
J55
2
J551
J53
2
J53 Junction Connector
L
W33
E5
34
E5
3
E4ECM
CANH
CANL
BATT B±Y
11
IA4
D6 DLC3
6
14CANH
CANL
BAT B
W 1
J54
2
J54 1
J56
2
J56 Suspension Control ECU
G
W (*1)
(*1) 29
S25
28
S25
25
S25 CANH
CANL
BATVB
J37C
J38VV 5
IA5B±Y
V
V Engine Room J/B & R/B No.2
EF1 No.1
AIR SUS No.27
2H
2
2 1
2D B
W W
WB
W 49
8
AIR
SUSALT
5
B
F10
FL
Block
Battery1
1L13
1F
1
2 OBD Instrument Panel J/B
W±R
16
*1: w/ Air Suspension System12 J/C
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1107
1301 Author: Date:
2005 SEQUOIA (RM1146U)
Check CAN Bus Line For Short To + B
CIRCUIT DESCRIPTION
A short to +B is suspected in the CAN bus line when there is continuity between terminals 16 (BAT) and 6
(CANH) or terminals 16 (BAT) and 14 (CANL) of the DLC3.
SymptomTrouble Area
There is continuity between terminals 16 (BAT) and 6
(CANH) or 16 (BAT) and 14 (CANL) of the DLC3.

Short to +B in CAN bus line

ECM

Translate ECU

Suspension control ECU
WIRING DIAGRAM
DIDIF±01

DIDGQ±01
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1155
1349 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
1. DTCS FOR SUPPLEMENTAL RESTRAINT SYSTEM
If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below
(Proceed to the page listed for that circuit).
HINT:

When the SRS warning light remains on and the DTC output is the normal system code, a voltage
source drop is likely to occur. This malfunction is not stored in the memory by the airbag sensor assem-
bly. If the power source voltage returns to normal, the SRS warning light will automatically go off.

When 2 or more codes are indicated, the code with the lower number appears first.

If a code is not listed on the display chart, the airbag sensor assembly may have failed.

In the case of any malfunction concerning an open circuit, short to ground, or short to B+ due to a squib,
other malfunction codes may not be detected. In this case, repair the malfunction currently indicated
and then perform malfunction diagnosis again.

Mark in the check mode column:
ºº: DTC is corresponding to the check mode.
º º: DTC is not corresponding to the check mode.

When the DTC B1650/32 is detected as a result of troubleshooting for the Supplemental Restraint Sys-
tem, perform troubleshooting for the occupant classification system as shown in the chart below.
DTC No.
(See
Page)
Detection ItemTrouble AreaCheck ModeSRS
Warning Light
B1000/31
(DI±1161)
Airbag sensor assembly malfunction
Airbag sensor assemblyON
B1610/13
(DI±1162)
Front airbag sensor RH malfunction

Front airbag sensor RH

Airbag sensor assembly

Cowl wire

Engine room main wire
ON
B1615/14
(DI±1171)
Front airbag sensor LH malfunction

Front airbag sensor LH

Airbag sensor assembly

Cowl wire

Engine room main wire
ON
B1620/21
(*1)
(DI±1180)

Side airbag sensor assembly RH malfunction

Side airbag sensor assembly RH

Airbag sensor assembly

Floor wire
ON
B1625/22
(*1)
(DI±1186)

Side airbag sensor assembly LH malfunction

Side airbag sensor assembly LH

Airbag sensor assembly

Floor wire No. 2
ON
B1630/23
(*1)
(DI±1192)

Curtain shield airbag sensor RH malfunction

Curtain shield airbag sensor assembly RH

Airbag sensor assembly

Floor wire
ON
B1635/24
(*1)
(DI±1198)

Curtain shield airbag sensor LH malfunction

Curtain shield airbag sensor assembly LH

Airbag sensor assembly

Floor wire No. 2
ON
B1650/32
(DI±1204)
Occupant classification system malfunction

Occupant classification system

Airbag sensor assembly

Floor wire

Seat wire No. 1
ON
B1653/35
(DI±1213)
Seat position sensor assembly malfunction

Seat position airbag sensor assembly

Airbag sensor assembly

Floor wire No. 2
ON

H23631H03352H23983H24011
Airbag
Sensor
Assembly Front Airbag
Sensor RH
Engine Room Main Wire
A
B
C D E F
Service Wire
Cowl Wire
+SR±SR
A12IL3
+SR ±SR
H03354H23983H24012
Airbag
Sensor
Assembly
+SR±SRA
B D E
C F
Front Airbag
Sensor RH
Cowl WireEngine Room Main Wire
IL3
DI±1168
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1362 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check engine room main wire (open).
PREPARATION:
Disconnect the engine room main wire connector from the cowl
wire.
HINT:
The service wire has already been inserted into connector ºEº.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
IL3±1 (+SR) ±
IL3±2 (±SR)AlwaysBelow 1 W
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.
9 Check engine room main wire (short).
PREPARATION:
Disconnect the engine room main wire connector from the cowl
wire.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
IL3±1 (+SR) ±
IL3±2 (±SR)Always1 MW or higher
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.

H03354H23983H24012
Airbag
Sensor
Assembly
+SR±SRA
B D E
C F
Front Airbag
Sensor RH
Cowl WireEngine Room Main Wire
IL3
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1169
1363 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check engine room main wire (short to B+).
PREPARATION:
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the bat-
tery, and wait for at least 90 seconds.
(c) Disconnect the engine room main wire connector from the
cowl wire.
(d) Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
IL3±1 (+SR) ±
Body groundIgnition switch ONBelow 1 V
IL3±2 (±SR) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.

H03354H23983H24012
Airbag
Sensor
Assembly
+SR±SRA
B D E
C F
Front Airbag
Sensor RH
Cowl WireEngine Room Main Wire
IL3
DI±1170
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1364 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check engine room main wire (short to ground).
PREPARATION:
Disconnect the engine room main wire connector from the cowl
wire.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
IL3±1 (+SR) ±
Body groundAlways1 MW or higher
IL3±2 (±SR) ±
Body groundAlways1 MW or higher
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.