2001 TOYOTA SEQUOIA O2 sensor harness

Z17007
Fig. 4
Sensor
21A
C
1
1
22B5V
5V
5V
0V
Z17008
Fig. 5
2 1A C
1
1
22
BSHORT
Z17009
Fig. 6
21A C
1
1
22
BSensorECU IN±38
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
38 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Check the voltage.
In a circuit in which voltage is applied (to the ECU connec-
tor terminal), an open circuit can be checked by conduct-
ing a voltage check.
As shown in Fig. 4, with each connector still con-
nected, measure the voltage between body ground
and terminal 1 of connector ºAº at the ECU 5V out-
put terminal, terminal 1 of connector ºBº, and termi-
nal 1 of connector ºCº, in that order.
If the results are:
5V: Between Terminal 1 of connector ºAº and Body Ground
5V: Between Terminal 1 of connector ºBº and Body Ground
0V: Between Terminal 1 of connector ºCº and Body Ground
Then it is found out that there is an open circuit in the wire har-
ness between terminal 1 of ºBº and terminal 1 of ºCº.
7. CHECK SHORT CIRCUIT
If the wire harness is shorted as in Fig. 5, locate the section by
conducting a ºcontinuity check with groundº.
Check the continuity with ground.
(1) Disconnect connectors ºAº and ºCº and measure
the resistance between terminals 1 and 2 of con-
nector ºAº and body ground.
In the case of Fig. 6:
Between terminal 1 of connector ºAº and body
ground " Continuity (short)
Between terminal 2 of connector ºAº and body
ground " No continuity
Therefore, it is found out that there is a short circuit
between terminal 1 of connector ºAº and terminal 1
of connector ºCº.

Z17808
Fig. 7
Sensor
21A B1 C
1
1
221
2 B2
ECU
IN0383
Example
Ground
IN0384
Ground
Ground
ECU Side
W/H Side
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN±39
39 Author: Date:
2005 SEQUOIA (RM1146U)
(2) Disconnect connector ºBº and measure the resis-
tance between terminal 1 of connector ºAº and body
ground, and terminal 1 of connector ºB2º and body
ground.
In the case of Fig. 7:
Between terminal 1 of connector ºAº and body
ground " No continuity
Between terminal 1 of connector ºB2º and body
ground " Continuity (short)
Therefore, it is found out that there is a short circuit
between terminal 1 of connector ºB2º and terminal
1 of connector ºCº.
8. CHECK AND REPLACE ECU
First check the ECU ground circuit. If it is faulty, repair it. If it is
normal, the ECU could be faulty, so replace the ECU with a nor-
mal functioning one and check that the symptoms appear.
(1) Measure the resistance between the ECU ground
terminal and the body ground.
Resistance: 1 W or less
(2) Disconnect the ECU connector, check the ground
terminals on the ECU side and the wire harness
side for bend and check the contact pressure.

SS1KF±04
± SERVICE SPECIFICATIONSSUSPENSION AND AXLE
SS±39
181 Author: Date:
2005 SEQUOIA (RM1146U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
TIRE PRESSURE MONITOR RECEIVER
Tire pressure monitor receiver set bolt7.57666 in.´lbf
TIRE PRESSURE MONITOR VALVE
Tire pressure monitor valve set nut4.04135 in.´lbf
FRONT AXLE
Hub nut11 01,15083
Tie rod end lock nut5556041
Steering knuckle x Brake caliper8082059
Steering knuckle x Dust cover1231,25090
Drive shaft lock nut1818513
Upper suspension arm x Upper ball joint2352,400173
Brake line clamp x Steering knuckle1051,10077
ABS speed sensor x Steering knuckle2828521
ABS speed sensor wire harness clamp x Steering knuckle8.08271 in.´lbf
ABS speed sensor wire harness clamp x Upper suspension arm8.08271 in.´lbf
FRONT DIFFERENTIAL
Drive pinion x companion flangeSee page SA±43
Differential front mounting cushion x Chassis frame1371,400101
Differential rear mounting cushion x Chassis frame8789064
Differential front mounting cushion x Differential1571,60011 6
Differential rear mounting cushion x Differential1081,10080
Ring gear x Differential case9798571
Differential carrier x Differential tube7880058
Differential carrier x Side bearing retainer6970051
Differential x Front propeller shaft7475054
A.D.D. clutch case x Differential7880058
A.D.D. clutch case x Differential tube7880058
A.D.D. actuator x A.D.D. clutch case2121015
Tube with wire harness assembly clamp x Differential carrier131309
Drain plug6566048
Filler plug3940029
FRONT SUSPENSION
Suspension support x Chassis frame6465047
Piston rod x Suspension support2525018
Lower suspension arm x Shock absorber1351,400100
Upper suspension arm x Chassis frame981,00072
Lower suspension arm x Chassis frame1301,32596
Lower suspension arm x Lower ball joint1591,62111 7
Power steering gear Left side nut
Center bolt
Right side bolt and nut130
165
1651,350
1,700
1,70096
122
122
Tie rod end x Lower ball joint9193067
No. 1, No. 2 spring bumper31 (23)315 (235)23 (17)
Lower suspension arm x Stabilizer bar link6970051

SS085±04
± SERVICE SPECIFICATIONSBRAKE
SS±43
185 Author: Date:
2005 SEQUOIA (RM1146U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Bleeder plug1111 08
Master cylinder x Reservoir1.51513 in.´lbf
Master cylinder x Brake booster2525018
Master cylinder x Master cylinder pressure sensor2525018
Brake booster clevis lock nut2525018
Brake booster x Brake booster bracket2525018
Brake booster x Pedal bracket131309
Brake pedal x Pedal bracket3435025
Stop light switch lock nut2526019
Parking brake pedal assembly x Pedal bracket3232023
Parking brake pedal assembly x Body131309
Brake line union nut 10 mm1515511
12 mm19.519514
Front disc brake caliper x Steering knuckle1231,25090
Rear disc brake caliper installation bolt8890065
Rear disc brake caliper x Flexible hose3132023
Rear disc brake torque plate x Backing plate1051,07077
Actuator bracket x Body1111 28
Actuator bracket x Actuator assembly9.59784 in.´lbf
Actuator x Skid control ECU1.81816 in.´lbf
Speed sensor installation bolt8.08271 in.´lbf
Front speed sensor harness x Steering knuckle8.08271 in.´lbf
Front speed sensor harness x Upper arm8.08271 in.´lbf
Front speed sensor harness x Coil support8.08271 in.´lbf

DI±66
± DIAGNOSTICSENGINE
260 Author: Date:
2005 SEQUOIA (RM1146U)P043E
(DI±445)
Evaporate Emission System
Reference Orifice Clog Up
Pump module
P043F
(DI±445)Evaporate Emission System
Reference Orifice High Flow
Pump module
P0441
(DI±257)Evaporative Emission Control
System Incorrect Purge Flow

Purge valve

Purge valve circuit (between purge valve and ECM)

Leakage from EVAP line (between purge valve and intake
manifold)

EVAP line (between purge valve and canister) clogged

ECM

P0450
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
[Fuel Tank Pressure Sensor]

Pump module (including pressure sensor)
P0451
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
Range/Performance

Pump module (including pressure sensor)
P0452
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
Low Input
Pump module (including pressure sensor)

Connector/Wire harness (between pump module and ECM)

ECM

P0453
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
High Input
Pump module (include pressure sensor)

Connector/Wire harness (between pump module and ECM)

ECM

P0455
(DI±273)Evaporative Emission Control
System Leak Detected (Gross
Leak)

Fuel tank cap (loose)

Leakage from EVAP line (between canister and fuel tank)

Leakage from EVAP line (between purge valve and canister)

Leakage from pump module

Leakage from fuel tank

Leakage from canister

P0456
(DI±273)Evaporative Emission Control
System Leak Detected (Very
Small Leak)

Same as DTC No. P0445
P0500
(DI±278)Vehicle Speed Sensor ºAº

Combination meter

Open or short in vehicle speed sensor circuit

Vehicle speed sensor

ECM

P0503
(DI±278)Vehicle Speed Sensor ºAº Inter-
mittent/Erratic/High

Combination meter

Open or short in vehicle speed sensor circuit

Vehicle speed sensor

ECM
±
P0504
(DI±283)Brake Switch ºAº/ºBº Correlation

Short in stop lamp switch signal circuit

STOP fuse

Stop lamp switch

ECM
±
P0505
(DI±288)Idle Air Control System

Air induction system

Electric throttle control system

PCV hose connection

P0560
(DI±292)System Voltage

Back±up power source circuit

EFI No. 1 fuse

ECM

P0604
(DI±296)Internal Control Module Random
Access Memory (RAM) Error
ECM
P0606
(DI±296)ECM/PCM Processor
ECM
P0607
(DI±296)Control Module Performance
ECM

± DIAGNOSTICSENGINE
DI±71
265 Author: Date:
2005 SEQUOIA (RM1146U)P2401
(DI±410)
Evaporative Emission System
Leak Detection Pump Control
Circuit Low
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2402
(DI±410)Evaporative Emission System
Leak Detection Pump Control
Circuit High
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2419
(DI±416)Evaporate Emission System
Switching Valve Control Circuit
Low
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2420
(DI±416)Evaporate Emission System
Switching Valve Control Circuit
High
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2430
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2431
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
Range/Performance Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2432
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
Low Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2433
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
High Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2440
(DI±314)Secondary Air Injection System
Switching Valve Stuck Open
Bank 1

Electromagnetic air switching valve

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection system (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM

P2441
(DI±330)Secondary Air Injection System
Switching Valve Stuck Close
Bank 1

Vacuum hoses (Throttle body ± VSVs for air injection control)

Electromagnetic air switching valve

Air injector pipe (Air switching valve No.2 ± exhaust manifold)

Air injection hose

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection control (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM

P2444
(DI±426)Secondary Air Injection System
Pump Stuck On Bank 1

Short in air pump circuit

Pressure sensor

Air pump assembly

Open or short in pressure sensor circuit

ECM


A23659
Wire Harness Side:
HT
A38
Sensor 1A/F Sensor Connector
Front View
+B A39
B17415
E7ECM Connector
HA1A
HA2A
H24253
A/F Relay
Engine Room R/B No.2:
DI±92
± DIAGNOSTICSENGINE
286 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short in harness and connector between ECM and A/F sen-
sor.
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the A38 or A39 A/F sensor connector.
(c) Disconnect the E7 ECM connector.
CHECK:
Check the resistance.
OK:
Standard (Check for open):
Tester ConnectionsSpecified Conditions
HT (A38±1) ± HA1A (E7±2)
HT (A39±1) ± HA2A (E7±1)Below 1 W
Standard (Check for short):
Tester ConnectionsSpecified Conditions
HT (A38±1) or HA1A (E7±2) ± Body ground
HT (A39±1) or HA2A (E7±1) ± Body ground10 kW or higher
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the A38 or A39 A/F sensor connector.
(c) Remove A/F relay from engine room R/B No.2.
CHECK:
Check the resistance.
OK:
Standard (Check for open):
Tester ConnectionsSpecified Conditions
+B (A38±2) ± A/F relay (3)
+B (A39±2) ± A/F relay (3)Below 1 W
Standard (Check for short):
Tester ConnectionsSpecified Conditions
+B (A38±2) or A/F relay (3) ± Body ground
+B (A39±2) or A/F relay (3) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI±11).

A23543
+B
OXR2
OXL2E1 HTR2
HTL2
H2
H4
Wire Harness Side:
Bank 1 Sensor 2, Bank 2 Sensor 2
B17416HT1BECM Connector E7OX1B E8
HT2B
OX2B
H24254
Engine Room R/B:
EFI Relay
± DIAGNOSTICSENGINE
DI±101
295 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short in harness and connector between ECM and heated
oxygen sensor, heated oxygen sensor ± EFI relay.
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the H2 or H4 oxygen sensor connector.
(c) Disconnect the E7and E8 ECM connector.
CHECK:
Check the resistance.
OK:
Standard (Check for open):
Tester ConnectionsSpecified Conditions
HTL2 (H2±1) ± HT1B (E8±1)Below 1 W
HTR2 (H4±1) ± HT2B (E7±5)Below 1 W
Standard (Check for short):
Tester ConnectionsSpecified Conditions
HTL2 (H2±1) or HT1B (E8±1) ±
Body ground10 kW or higher
HTR2 (H4±1) or HT2B (E7±5) ±
Body ground10 kW or higher
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the H2 or H4 oxygen sensor connector.
(c) Remove EFI relay from engine room R/B.
CHECK:
Check the resistance.
OK:
Standard (Check for open):
Tester ConnectionsSpecified Conditions
+B (A21±2) ±EFI relay (3)
+B (A22±2) ± EFI relay (3)Below 1 W
Standard (Check for short):
Tester ConnectionsSpecified Conditions
+B (H2±2) or EFI relay (3) ± Body ground
+B (H2±2) or EFI relay (3) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI±11).