1998 TOYOTA LAND CRUISER Knock sensor
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- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-367
560 Author: Date:
6. DEFINITION OF TERMS
TermDefinition
Monitor descriptionDescription of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCsDiagnostic code
Typical enabling condition
Preconditions that allow the ECM to detect malfunctions.
With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
Sequence of operation
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
While another sensor is being monitored, the next sensor or component will not be monitored until the previous
monitoring has concluded.
Required sensor/compo-
nentsThe sensors and components that are used by the ECM to detect malfunctions.
Frequency of operation
The number of times that the ECM checks for malfunctions per driving cycle.
ºOnce per driving cycleº means that the ECM detects malfunction only one time during a single driving cycle.
ºContinuousº means that the ECM detects malfunction every time when enabling condition is met.
DurationThe minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
DTC. This timing begins after the ºtypical enabling conditionsº are met.
Malfunction thresholdsBeyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation
MIL illumination timing after a defect is detected.
ºImmediatelyº means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
º2 driving cycleº means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
cycle.
7. TOYOTA/LEXUS 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, Hydrocarbon 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 VAV, 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-boad 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
Page 1235 of 3115
A00068
KNK Signal Waveform
0.5 V
Division
0.5 V/
Division0 V
0 V5 msec./Division
0.2 msec./Division DI-186
- DIAGNOSTICSENGINE
379 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0325 Knock Sensor 1 Circuit (Bank 1 or Single
Sensor)
DTC P0330 Knock Sensor 2 Circuit (Bank 2)
CIRCUIT DESCRIPTION
Each knock sensor is fitted to the right bank and left bank of the cylinder block to detect engine knocking.
This sensor contains a piezoelectric element which generates a voltage when it becomes deformed. The
piezoelectric element sends a signal to the ECM, when the cylinder block vibrates due to knocking. If engine
knocking occurs, ignition timing is retarded to suppress it.
DTC No.DTC Detecting ConditionTrouble Area
P0325No signal of knock sensor 1 signal to ECM with engine speed
between 2,000 rpm and 5,400 rpmOpen or short in knock sensor 1 circuit
Knock sensor 1 (looseness)
ECM
P0330No signal of knock sensor 2 signal to ECM with engine speed
between 2,000 rpm and 5,400 rpmOpen or short in knock sensor 2 circuit
Knock sensor 2 (looseness)
ECM
HINT:
Bank 1 refers to the bank that includes cylinder No. 1.
Bank 2 refers the the bank that does not include cylinder No. 1.
Reference: INSPECTION USING OSCILLOSCOPE
With the engine racing (4,000 rpm), check the waveform
between terminals KNK1 and KNK2 of the ECM connec-
tor and body ground.
HINT:
The correct waveform is as shown.
Spread the time on the horizontal axis, and confirm that
period of the wave is 0.13 msec. (Normal mode vibration
frequency of knock sensor: 8.1 kHz)
HINT:
If normal mode vibration frequency is not 8.1 kHz, the sensor
has malfunction.
DI1LQ-14
Page 1236 of 3115
- DIAGNOSTICSENGINE
DI-187
380 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR DESCRIPTION
The knock sensor located on the cylinder block, detects spark knock.
When spark knock occurs, the sensor pick-up vibrates in a specific frequency range. When the ECM detects
the voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults
in the sensor. If the knock sensor signal level is too low for more than 10 sec., and if the knock sensor output
voltage is out of normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.
MONITOR STRATEGY
RltdDTCP0325Knock sensor (Bank 1) range check or rationalityRelated DTCsP0330Knock sensor (Bank 2) range check or rationality
Main sensors/componentsKnock sensor
Required sensors/componentsRelated sensors/components
Crankshaft position sensor, Camshaft position
sensor, Engine coolant temperature sensor,
Mass air flow meter
Frequency of operationContinuous
Duration10 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Battery voltage10 V-
IdleOFF
Time after engine start5 sec.-
Engine coolant temperature60C (140F)-
Intake air amount per revolution0.45 g/rev-
Engine speed2,000 rpm5,400 rpm
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Sensor failure is indicated when the knock sensor output
level is below the specific threshold for:10 sec.
Page 1237 of 3115
A19967A20086
ECM
KNK1 1
E6 B2 K1
Knock Sensor 1
1
K2
Knock Sensor 21
2
KNK2 E6 EC1
EC *1: Shielded(*1)
3 EC1
W(*1)
B
W
J17
J/C
E
D
BRE
E
DBR
J17
J/C DI-188
- DIAGNOSTICSENGINE
381 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 1238 of 3115
FI7050A01996A01997A19886
ECM
KNK1
KNK2 22
33
Female
Connector Male
Connector1
1EC1
E6
2 1
3 21
321
E6
EC1
Knock Sensor 1
Knock Sensor 2
- DIAGNOSTICSENGINE
DI-189
382 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
DTC P0325 is for the bank 1 knock sensor circuit.
DTC P0330 is for the bank 2 knock sensor circuit.
Read freeze frame data using the hand-held tester or the OBD II scan tool. 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 Connect OBD II scan tool or hand-held tester, and check knock sensor circuit.
PREPARATION:
(a) Connect the OBD II scan tool or hand-held tester to the
DLC3.
(b) Disconnect the EC1 connector.
(c) Connect the terminals of the disconnected EC1 male con-
nector and EC1 female as follows.
Male connector eFemale connector
Terminal 2 e Terminal 3
Terminal 3 e Terminal 2
(d) Turn ignition switch ON and push the OBD II scan tool or
hand-held tester main switch ON.
(e) After the engine is warmed up, perform quick racing to
4,000 rpm 3 times.
CHECK:
Check the DTC.
RESULT:
Type IDTC same as when vehicle brought in
P0325 " P0325 or P0330 " P0330
Type IIDTC different to when vehicle brought in
P0325 " P0330 or P0330 " P0325
Type II Go to step 3.
Type I
Page 1239 of 3115
DI-190
- DIAGNOSTICSENGINE
383 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open and short in harness and connector between EC1 connector and
ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
3 Check for open and short in harness and connector between EC1 connector and
knock sensor (See page IN-36).
HINT:
If DTC P0325 has changed to P0330, check the knock sensor circuit on the bank 1 side.
If DTC P0330 has changed to P0325, check the knock sensor circuit on the bank 2 side.
NG Repair or replace harness or connector.
OK
Replace knock sensor.
Page 1399 of 3115
DI-40
- DIAGNOSTICSENGINE
233 Author: Date:
2004 LAND CRUISER (RM1071U)P0230
(DI-162)
Fuel Pump Primary Circuit
Open or short in fuel pump relay circuit
Fuel pump relay
Circuit opening relay
Fuel pump
ECM
-
P0300
(DI-167)Random/Multiple Cylinder Misfire
Detected*2
P0301
(DI-167)Cylinder 1 Misfire Detected
Open or short in engine wire
*2
P0302
(DI-167)Cylinder 2 Misfire Detected
Open or short in engine wire
Connector connection
Vacuum hose connection
*2
P0303
(DI-167)Cylinder 3 Misfire Detected
Vacuum hose connection
Ignition system
Injector*2
P0304
(DI-167)Cylinder 4 Misfire Detected
Fuel pressure
Mass air flow meter
Engine coolant temperature sensor
*2
P0305
(DI-167)Cylinder 5 Misfire Detected
Engine coolant temperature sensor
Compression pressure
Valve clearance
*2
P0306
(DI-167)Cylinder 6 Misfire Detected
Valve clearance
Valve timing
PCV piping*2
P0307
(DI-167)Cylinder 7 Misfire Detected
ECM
*2
P0308
(DI-167)Cylinder 8 Misfire Detected*2
P0325
(DI-186)Knock Sensor 1 Circuit (Bank 1
or Single Sensor)Open or short in knock sensor 1 circuit
Knock sensor 1 (looseness)
ECM
P0330
(DI-186)Knock Sensor 2 Circuit (Bank 2)
Open or short in knock sensor 2 circuit
Knock sensor 2 (looseness)
ECM
P0335
(DI-191)Crankshaft Position Sensor ºAº
Circuit
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Signal plate
ECM
P0339
(DI-191)Crankshaft Position Sensor ºAº
Circuit Intermittent
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Signal plate
ECM
-
P0340
(DI-197)Camshaft Position Sensor ºAº
Circuit (Bank 1 or Single Sensor)Open or short in camshaft position sensor circuit
Camshaft position sensor
P0341
(DI-197)Camshaft Position Sensor ºAº
Circuit Range/Performance
(Bank 1 or Single Sensor)
Camshaft osition sensor
LH camshaft timing pulley
Jumping teeth of timing belt
ECM
P0351
(DI-202)Ignition Coil ºAº Primary/Second-
ary Circuit
Open or short in IGF 1 and IGT 1 circuit from No. 1 ignition coil
with igniter to ECM
No. 1 ignition coil with igniter
Ignition system
ECM
P0352
(DI-202)Ignition Coil ºBº Primary/Second-
ary Circuit
Open or short in IGF 2 and IGT 2 circuit from No. 2 ignition coil
with igniter to ECM
No. 2 ignition coil with igniter
Ignition system
ECM
Page 1405 of 3115
DI1L5-18
A21338
Fuel Pump Resister Knock Sensor 2
Heated Oxygen Sensor
(Bank 1 Sensor 1) Heated Oxygen Sensor
(Bank 2 Sensor 1)VSV for EVAP
Combination Meter
Ignition Coil with Igniter
ECMKnock Sensor 1
Injector
Throttle Control
Motor and Sensor
Mass Air Flow Meter
Engine Coolant
Temperature Sensor
Camshaft
Position Sensor
Crankshaft
Position Sensor
VSV for CCV
Park/neutral Position Switch DLC3
Vapor Pressure Sensor VSV for
Pressure Switching Valve
Accelerator Pedal Assembly
(Accelerator Pedal Position Sensor)
Cowl Side J/B LH:
STOP Fuse
EFI or ECD No. 2 Fuse
Engine Room R/B and J/B:
Circuit Opening Relay
Fuel Pump Relay
EFI or ECD Relay
STARTER Relay
EFI or ECD No. 1 Fuse
ECTS Fuse
- DIAGNOSTICSENGINE
DI-45
238 Author: Date:
2004 LAND CRUISER (RM1071U)
PARTS LOCATION