TOYOTA SEQUOIA 2001 Service Repair Manual

A23556
8 J17
J/CECM Combination Meter
SPD
E5 G±O
B G±O 25
C5
B
± DIAGNOSTICSENGINE
DI±279
473 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
Related DTCsP0500Vehicle speed sensor ºAº pulse input error
Main sensorsVehicle speed sensor
Required sensors/componentsRelated sensorsPark/Neutral position switch, Engine coolant tem-
perature sensor, Combination meter
Frequency of operationContinuous
Duration500 times
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Vehicle speed is 9 km/h (5.59 mph) or
more4 sec.±
Park/neutral position switchOFF
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Sensor signalNo pulse input
WIRING DIAGRAM

DI±280
± DIAGNOSTICSENGINE
474 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air±fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check operation of speedometer.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand±held tester main switch ON.
(c) Start the engine.
(d) When using hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / PRIMARY / VEHICLE SPD.
CHECK:
Read the mass air flow rate on the hand±held tester.
RESULT:
Vehicle speedProceed to
Vehicle speed remains 0 km/h (0 mph)A
Vehicle speed is lower than actual speedA
Vehicle speed is same as actual speedB
B Check for intermittent problems
(See page DI±11).
A

B17411
SPD(+) E6
E5
E1
AT7809
4 to 6 V
Turn the Wheel
3
2
1
I25536
Component Side Connector:
Vehicle Speed Sensor
± DIAGNOSTICSENGINE
DI±281
475 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check voltage between terminal SPD and E1 of ECM connector.
PREPARATION:
(a) Shift the shift lever to neutral.
(b) Jack up the rear wheel on one side.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between the specified terminal of the E5
and E6 ECM connector when the wheel is turned slowly.
OK:
Standard:
Tester ConnectionSpecified Condition
SPD (E5±8) ± E1 (E6±1)Generated intermittently
HINT:
The output voltage should fluctuate up and down similarly to the
diagram on the left when the wheel is turned slowly.
OK Replace ECM (See page SF±80).
NG
3 Check vehicle speed sensor.
PREPARATION:
(a) Disconnect the vehicle speed sensor connector.
(b) Connect the battery positive (+) lead to terminal 1 and the
battery negative (±) lead to terminal 2.
(c) Connect the tester positive (+) lead to terminal 3 and the
tester negative (±) lead to terminal 2.
(d) Shift the shift lever to N position.
(e) Rotate the shaft.
CHECK:
Check that there is voltage change between terminals 2 and 3.
OK:
Standard: 0 V to 10 V or more
NG Replace vehicle speed sensor.
OK

BR3795OK NGClearance
B17411
SPD(+) E5
A23540
Wire Harness Side:
Front View
Combination Meter Connector C5
DI±282
± DIAGNOSTICSENGINE
476 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check sensor installation (Vehicle speed sensor).
CHECK:
Check the vehicle speed sensor installation.
OK:
The vehicle speed sensor is installed properly.
NG Tighten sensor installation bolt.
OK
5 Check for open and short in harness and connector between combination meter
and ECM.
PREPARATION:
(a) Disconnect the C5 combination meter connector.
(b) Disconnect the E5 ECM connector.
CHECK:
Check for resistance between the wire harness side connec-
tors.
OK:
Standard (Check for open):
Symbols (Terminal No.)Specified condition
SPD (E5±8) ± C5±25Below 1 W
Standard (Check for short):
Symbols (Terminal No.)Specified condition
SPD (E5±8) or C5±25 ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Check combination meter circuit (See page
DI±1632

± DIAGNOSTICSENGINE
DI±283
477 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0504 Brake Switch ºAº/ºBº Correlation
CIRCUIT DESCRIPTION
In addition to turning on the stop lamps, the stop lamp switch signals are used for a variety of engine, trans-
mission, and suspension functions as well as being an input for diagnostic checks. It is important that the
switch operates properly, therefore this switch is designed with two complementary signal outputs: STP and
ST1±. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.
HINT:
Normal condition is as shown in the table.
SignalBrake pedal releasedIn transitionBrake pedal depressed
STPOFFONON
ST1±ONONOFF
DTC No.DTC Detection ConditionTrouble Area
P0504
Conditions (a), (b) and (c) continue for 0.5 sec. or more:
(a) Ignition switch ON
(b) Brake pedal released
(c) STP signal is OFF when the ST1± signal is OFF
Short in stop lamp switch signal circuit

Stop lamp fuse

Stop lamp switch

ECM
DID8C±01

I18
Ignition
SW
A23552
ECM
STOPSTP
ALT
BatteryE4
16 G±Y
J/C1 S14 Stop Light SW
2
G±W
BR7
Stop
Light
LH
R8
Stop
Light
RH3
5
8W±R
A W
High
Mounted
Stop Light
W±B 1L
1 1F
7
F10
Fusible
Link
BlockInstrument
Panel J/B1
4EG±Y
4B8
Brake Inhibit Relay
G±Y 4
See VSC System 2
W
J19
J/CB
C
IC
CC
C
4
BD1
1
22
1H9 H9(*1)
(*2) (*1)(*2)
BD2
12 J/C
A1
4
G±W IG2
*1: w/o Rear Spoiler
*2: w/ Rear Spoiler AM2
To Towing
Converter Relay
W±BST1±
E4 15
4C 4A1
1
3
L±B Sub J/B No.4
2
IGN1 B±O2
4D2
4A
1E 17
2 1C
1 A
J44J11
J/C J10
J
J33
J34 C
3
IJ
52C
2D 11
AM2
B W±RB±R
6
Instrument
Panel J/B
BP1
4 G±W B±O
G±W
G±W G±WSub J/B No.4
J10
J45
4
BJ J57
J/CA
W±BW±B G±W
High
Mounted
Stop LightG±WJ20
J/C G±W H
Engine Room
J/B DI±284
± DIAGNOSTICSENGINE
478 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSENGINE
DI±285
479 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air±fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check operation of stop light.
CHECK:
Check if the stop lights come on and go off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check stop light switch (See page BE±47).
NG Replace stop light switch.
OK

B17446
Brake Pedal
DepressedBrake Pedal
Released ON
() ()
ST1±(+)E4
E6
E1(±)
DI±286
± DIAGNOSTICSENGINE
480 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check STP signal and ST1± voltage.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Select the item ºDIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / STOP LIGHT SWº.
CHECK:
Read the signal displayed on the hand±held tester.
OK:
Standard:
Brake PedalSpecified Condition
DepressedSTP Signal ON
ReleasedSTP Signal OFF
CHECK:
Measure the voltage between the specified terminals of the E4
and E6 ECM connectors.
OK:
Standard:
Tester ConnectionBrake PedalSpecified Condition
ST1± (E4±12) ±
E1 (E6±1)DepressedBelow 1.5 V
ST1± (E4±12) ±
E1 (E6±1)Released7.5 to 14 V
OK Check for intermittent problems (See page
DI±11).
NG

B17447
Wire Harness Side:
Stop Light Switch Connector
S14
ST1±STP
E4
± DIAGNOSTICSENGINE
DI±287
481 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector between ECM and stop light switch.
PREPARATION:
(a) Disconnect the S14 stop light switch connector.
(b) Disconnect the E4 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
Stop light switch (S14±1) ± STP (E4±15)Below 1 W
Stop light switch (S14±3) ± ST1±
(E4±16)Below 1 W
Stop light switch (S14±1) or
STP (E4±15) ± Body ground10 kW or higher
Stop light switch (S14±3) or
ST1± (E4±16) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF±80).

A20823
Idle engine
RPM
Small Target RPM
Actual idle RPMLarge
Learned value
of the idle speed
controlMaximum
Minimum
Time 0
Time DI±288
± DIAGNOSTICSENGINE
482 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0505 Idle Air Control System
CIRCUIT DESCRIPTION
The idle speed is controlled by the ETCS (Electronic Throttle Control System).
The ETCS is composed of the throttle motor which operates the throttle valve, and the throttle position sen-
sor, which detects the opening angle of the throttle valve.
The ECM controls the throttle motor to provide the proper throttle valve opening angle to obtain the target
idle speed.
DTC No.DTC Detection ConditionTrouble Area
P0501Idle speed continues to vary greatly from target speed
(2 trip detection logic)

ETCS

Air induction system

PCV hose connection

ECM
MONITOR DESCRIPTION
The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM con-
cludes that the idle speed control ECM function is malfunctioning if: 1) the actual idle RPM varies more than
the specified amount, or 2) a learning value of the idle speed control remains at the maximum or minimum
five times or more during a driving cycle. The ECM will turn on the MIL and set a DTC.
Example:
If the actual idle RPM varies from the target idle RPM by more than 100 (*1) rpm five times during a driving
cycle, the ECM will turn on the MIL and a DTC is set.
HINT:
*1: RPM threshold varies with engine load.
DICF6±02