knock sensor TOYOTA SEQUOIA 2001 Service Repair Manual

V08423 Knock Sensor 1
GRECM
KNK
E1 12
E6
WIRING DIAGRAM
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
DTC P0325Knock Sensor 1 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which
generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine
knocking occurs, ignition timing is retarded to suppress it.
DTC No. DTC Detecting Condition Trouble Area
P0325No knock sensor 1 signal to ECM with engine speed,
1,200 rpm or more. Open or short in knock sensor1 circuit
 Knock sensor 1 (looseness)
 ECM
If the ECM detects the above diagnosis conditions, it operates the fall safe function in which the corrective retard angle
value is set to the maximum value.
 Diagnostic Trouble Code No. and Detection Item
 Circuit Description
The major role and operation, etc. of the circuit
and its component parts are explained.
 Indicates the diagnostic trouble code, diagnostic
trouble code set parameter and suspect area of
the problem.

± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN±33
33 Author: Date:
2005 SEQUOIA (RM1146U)
6. CIRCUIT INSPECTION
How to read and use each page is shown below.

V08425
LOCK
KNK
E6 Connector
(a) Remove the glove compartment (See page SF±68).
(b) Disconnect the E6 connector of ECM.
INSPECTION PROCEDURE
Replace knock sensor. 1 Check continuity between terminal KNK of ECM connector and body ground.
OK:
Check knock sensor (See page SF±61).Measure resistance between terminal KNK of ECM connector
and body ground.
Resistance: 1 MW or higher
Connector being checked is connected.  Indicates the condition of the connector of ECU during the check.
PREPARATION:
CHECK:
2Go to step 3.
OK OK
NG
 Indicates the position of the ignition switch during the check.
Check from the connector back side.
(with harness)
Ignition Switch LOCK (OFF)
Ignition Switch START
LOCKIgnition Switch ON
Ignition Switch ACC
STARTON
ACC

 Indicates the place to check the voltage or resistance.
 Indicates the connector position to be checked, from the front or back side.
Connector being checked is disconnected. Check from the connector front side. (without harness)
In this case, care must be taken not to bend the terminals.
E6 Connector KNKWire Harness
E6 Connector KNK
A00255 AB0117
A00265
Inspection Procedure
Use the inspection procedure to determine if
the circuit is normal or abnormal, and, if it is
abnormal, use it to determine whether the
problem is located in the sensors, actuators,
wire harness or ECU. IN±34
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
34 Author: Date:
2005 SEQUOIA (RM1146U)

IN04Q±33
IN±40
± INTRODUCTIONTERMS
40 Author: Date:
2005 SEQUOIA (RM1146U)
TERMS
ABBREVIATIONS USED IN THIS MANUAL
AbbreviationsMeaning
ABSAnti±Lock Brake System
A/CAir Conditioner
ACAlternating Current
ACCAccessory
ACISAcoustic Control Induction System
ACMActive Control Engine Mount
ACSDAutomatic Cold Start Device
A.D.D.Automatic Disconnecting Differential
A/FAir±Fuel Ratio
AHCActive Height Control Suspension
ALRAutomatic Locking Retractor
ALTAlternator
AMPAmplifier
ANTAntenna
APPROX.Approximately
ASSYAssembly
A/T, ATMAutomatic Transmission (Transaxle)
AT FAutomatic Transmission Fluid
AUTOAutomatic
AUXAuxiliary
AV GAverage
AV SAdaptive Variable Suspension
B+Battery Voltage
BABrake Assist
BACSBoost Altitude Compensation System
BATBattery
BDCBottom Dead Center
B/LBi±Level
B/SBore±Stroke Ratio
BTDCBefore Top Dead Center
BVSVBimetallic Vacuum Switching Valve
CBCircuit Breaker
CCoCatalytic Converter For Oxidation
CCVCanister Closed Valve
CDCompact Disc
CFCornering Force
CGCenter Of Gravity
CHChannel
CKDComplete Knock Down
COMB.Combination
CPECoupe
CPSCombustion Pressure Sensor
CPUCentral Processing Unit
CRSChild Restraint System
CTRCenter
C/VCheck Valve
CVControl Valve
CWCurb Weight

IN±46
± INTRODUCTIONTERMS
46 Author: Date:
2005 SEQUOIA (RM1146U) IAC
Idle Air ControlIdle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature
ICMIgnition Control Module±
IFIIndirect Fuel InjectionIndirect Injection (IDL)
IFSInertia Fuel±Shutoff±
ISCIdle Speed Control±
KSKnock SensorKnock Sensor
MAFMass AirflowAir Flow Meter
MAPManifold Absolute PressureManifold Pressure Intake Vacuum
MCMixture Control
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
MDPManifold Differential Pressure±
MFIMultiport Fuel InjectionElectronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Lamp
MSTManifold Surface Temperature±
MVZManifold Vacuum Zone±
NVRAMNon±Volatile Random Access Memory±
O2SOxygen SensorOxygen Sensor, O2 Sensor (O2S)
OBDOn±Board DiagnosticOn±Board Diagnostic System (OBD)
OCOxidation Catalytic ConverterOxidation Catalyst Convert (OC), CCo
OLOpen LoopOpen Loop
PAIRPulsed Secondary Air InjectionAir Suction (AS)
PCMPowertrain Control Module±
PNPPark/Neutral Position±
PROMProgrammable Read Only Memory±
PSPPower Steering Pressure±
PTOXPeriodic Trap OxidizerDiesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM)
RMRelay Module±
ROMRead Only MemoryRead Only Memory (ROM)
RPMEngine SpeedEngine Speed
SCSuperchargerSupercharger
SCBSupercharger BypassE±ABV
SFISequential Multiport Fuel InjectionElectronic Fuel Injection (EFI), Sequential Injection
SPLSmoke Puff Limiter±
SRIService Reminder Indicator±
SRTSystem Readiness Test±
STScan Tool±
TBThrottle BodyThrottle Body
TBIThrottle Body Fuel InjectionSingle Point Injection
Central Fuel Injection (Ci)
TCTurbochargerTurbocharger
TCCTorque Converter ClutchTorque Converter
TCMTransmission Control ModuleTransmission ECU, ECT ECU

SS0CB±23
SS±12
± SERVICE SPECIFICATIONSSFI
154 Author: Date:
2005 SEQUOIA (RM1146U)
SFI
SERVICE DATA
Fuel pumpResistance at 20°C (68°F)0.2 to 3.0 W
Fuel pressure
regulatorFuel pressure at no vacuum265 to 304 kPa
(2.7 to 3.1 kgf/cm2, 38 to 44 psi)
InjectorResistance at 20°C (68°F)
Injection volume
Difference between each cylinder
Fuel leakage13.4 to 14.2 W
56 to 69 cm3 (3.4 to 4.2 cu in.) per 15 seconds
13 cm3 (0.8 cu in.) or less
1 drop or less per 12 minutes
MAF meterResistance (THA ± E2) at ±20°C (±4°F)
at 20°C (68°F)
at 60°C (140°F)12.5 to 16.9 kW
2.19 to 2.67 kW
0.50 to 0.68 kW
Throttle bodyThrottle body fully closed angle5.5°
Throttle control
motorMotor resistance at 20°C (68°F)0.3 to 100 W
VSV for EVAPResistance at 20°C (68°F)30 to 34 W
VSV for ACISResistance at 20°C (68°F)33 to 39 W
VT sensorResistance Cold
Hot835 to 1,400 W
1,060 to 1,645 W
Knock sensorResistance at 20°C (68°F)120 to 280 W
ECT sensorResistance at ±20°C (±4°F)
0°C (32°F)
20°C (68°F)
40°C (104°F)
60°C (140°F)
80°C (176°F)10 to 20 kW
4 to 7 kW
2 to 3 kW
0.9 to 1.3 kW
0.4 to 0.7 kW
0.2 to 0.4 kW
Air±fuel ratio
sensorHeater coil resistance at 20°C (68°F)11 to 16 kW
Heated oxygen
sensorHeater coil resistance at 20°C (68°F)11 to 16 kW
Accelerator pedal
position sensorStandard throttle valve opening percentage
Sensor lever full±open position
60 % or more
Fuel cut rpmFuel return rpm1,400 rpm
Fuel pump resisterat 20°C (68 °F)0.70 to 0.76 kW

SS0CC±22
± SERVICE SPECIFICATIONSSFI
SS±13
155 Author: Date:
2005 SEQUOIA (RM1146U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Fuel pressure pulsation damper x Delivery pipe for use with SST33
39340
40024
29
Fuel pressure regulator x RH delivery pipe7.58066 in.´lbf
Front fuel pipe x Lower intake manifold7.58066 in.´lbf
Fuel return pipe x Delivery pipe7.58066 in.´lbf
Delivery pipe x Intake manifold2121415
Fuel tank band x Body6263245
Fuel pressure regulator x Delivery pipe7.57666 in.´lbf
Throttle body x Intake manifold1818513
ECT sensor x Front water bypass joint19.620014
Knock sensor x Cylinder head2020415
Air±fuel ratio sensor x Exhaust manifold4445032
Heated oxygen sensor x Front exhaust pipe4445032
Fuel pump resister x Body88271 in.´lbf
Camshaft oil control valve x Cylinder head7.58066 in.´lbf
Air pump assembly x Cylinder head1616312

DID7O±02
± DIAGNOSTICSENGINE
DI±3
197 Author: Date:
2005 SEQUOIA (RM1146U)
TOYOTA PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS nameDefinition
Toyota HCAC system, Hydro±carbon Adsorptive Catalyst
(HCAC) system, HC adsorptive three±way catalystHC adsorptive three±way catalytic converter
Variable Valve Timing sensor, VVT sensorCamshaft position sensor
Variable valve timing system, VVT systemCamshaft timing control system
Camshaft timing oil control valve, Oil control valve, OCV,
VVT, VSVCamshaft timing oil control valve
Variable timing and lift, VVTLCamshaft timing and lift control
Crankshaft position sensor ºAºCrankshaft position sensor
Engine speed sensorCrankshaft position sensor
THAIntake air temperature
Knock control moduleEngine knock control module
Knock sensorEngine knock sensor
Mass or volume air flow circuitMass air flow sensor circuit
Vacuum sensorManifold air pressure sensor
Internal control module, Control module, Engine control
ECU, PCMPower train control module
FC idleDeceleration fuel cut
Idle air control valveIdle speed control
VSV for CCV, Canister close valve VSV for canister controlEvaporative emissions canister vent valve
VSV for EVAP, Vacuum switching valve assembly No. 1,
EVAP VSV, Purge VSVEvaporative emissions canister purge valve
VSV for pressure switching valve, Bypass VSVEvaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative
emission control system pressure sensorFuel tank pressure sensor
Charcoal canisterEvaporative emissions canister
ORVR systemOn±board refueling vapor recovery system
Intake manifold runner controlIntake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve)Intake manifold tuning valve
Intake control VSVIntake manifold tuning solenoid valve
AFSAir fuel ratio sensor
O2 sensorHeater oxygen sensor
Oxygen sensor pumping current circuitOxygen sensor output signal
Oxygen sensor reference ground circuitOxygen sensor signal ground
Accel position sensorAccelerator pedal position sensor
Throttle actuator control motor, Actuator control motor, Elec-
tronic throttle motor, Throttle control motorElectronic throttle actuator
Electronic throttle control system, Throttle actuator control
systemElectronic throttle control system
Throttle/pedal position sensor, Throttle/pedal position switch,
Throttle position sensor/switchThrottle position sensor
Turbo press sensorTurbocharger pressure sensor
Turbo VSVTurbocharger pressure control solenoid valve
P/S pressure switchPower±steering pressure switch
VSV for ACMActive control engine mount

DID7P±01
B17433
Heated Oxygen Sensor
(Bank 2 Sensor 2) Fuel Pump
Resister
Knock Sensor 2
A/F Sensor
(Bank 1 Sensor 1) A/F Sensor
(Bank 2 Sensor 1)EVAP VSV
Combination Meter
Ignition Coil with Igniter
ECM Knock Sensor 1
Injector Throttle Body
(Throttle Position Sensor,
Throttle Control Motor)Mass Air Flow
Meter
Camshaft
Position Sensor
Crankshaft Position
SensorHeated Oxygen Sensor
(Bank 2 Sensor 2)
Park/Neutral Position
Switch DLC3
Air Injection Driver
(AID)
Accelerator Pedal Assembly
(Accelerator Pedal Position
Sensor)
Fuel Pump
VVT Sensor (Bank 2)
VVT Sensor (Bank 1) OCV (Bank 2)
OCV (Bank 1) Air Pump
Air Switching Valve No.2
(ASV No.2) (Bank 1)
Air Switching Valve
(ASV) Air Switching Valve No.2
(ASV No.2) (Bank 2)
VSV for Air Injection
Contorl (Bank 1)
VSV for Air Injection
Contorl (Bank 2)ACIS VSVCharcoal Canister Assembly
± DIAGNOSTICSENGINE
DI±5
199 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DID7Q±01
B17429
ECM
IG SW
IGSW
STSW
STAR/NSW
STA
BATT
MREL
+BM
+B
+B2
VCPA
VPA
EPA
VCP2
VPA2
EPA2W
OC1+
OC1±
OC2+
OC2±
KNK1
EKNK
KNK2
EKN2
G2+
G2±
NE+
NE±
VV1+
VV1±
VV2+
VV2± ETCSMIL
To Battery
To Battery
To Battery
To BatteryTo Starter ST Relay
PNP SW
EFI No.1
EFI No.1 Relay
Acclererator Pedal
Position SensorCombination Meter
VVT OCV
(Bank 1)
VVT OCV
(Bank 2)
Knock Sensor
(Bank 1)
Knock Sensor
(Bank 2)
Camshaft Position
SensorTo V C
Terminal
Crankshaft
Position Sensor
VVT Sensor
(Bank 1)
VVT Sensor
(Bank 2) DI±6
± DIAGNOSTICSENGINE
200 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

A23648
GND 1V/ DIV KNK1 Signal Waveform
1 msec./ Division
A23649
200 msec./DIV 5 V/DIV
GroundA
B
A23650
20 msec./DIV 2 V/DIV
(a) Ground CH1
(b) Ground CH2
(c) Ground CH3
± DIAGNOSTICSENGINE
DI±37
231 Author: Date:
2005 SEQUOIA (RM1146U)
WAVEFORM 2
Knock sensor
ECM Terminal NameBetween KNK1 and EKNK
Between KNK2 and EKN2
Tester Range1 V/DIV, 1 msec./DIV
ConditionMaintain engine RPM at 2,000 rpm after engine warmed±up
HINT:

The wavelength becomes shorter as engine rpm in-
creases.

The waveforms and amplitudes displayed differ slightly
depending on the vehicle.
WAVEFORM 3
VVT OCV
ECM Terminal NameBetween OC1+ and OC1±
Between OC2+ and OC2±
Tester Range0.2 V/DIV, 200 msec./DIV
ConditionAccelerate slowly after engine warmed±up
HINT:
In the DATA LIST, the items VVT OCV DUTY B1 and B2 show
the duty ratio of voltage flowing to the OCV (see illustration on
left).
VVT OCV DUTY B1, B2 = A/B x 100 (%)
WAVEFORM 4
(a) VVT sensor bank 1
(b) VVT sensor bank 2
(c) Crankshaft position sensor
ECM Terminal Name
(a) Between VV1+ and VV1±
(b) Between VV2+ and VV2±
(c) Between NE+ and NE±
Tester Range2 V/DIV, 20 msec./DIV
ConditionIdle after engine warmed±up
HINT:
The wavelength becomes shorter as the engine rpm increases.