Knock sensor TOYOTA AVALON 2001 Service Repair Manual

A03315
Knock Sensor 1
(on Right Bank)
Knock Sensor 2
(on Left Bank)EB1 1
1W
W1
2W
WE4ECM
27
28KNKR
KNKLE1
E1 E4 EB1 DI-64
- DIAGNOSTICSENGINE
220 Author
: Date
:
2001 AVALON (RM808U)
DTC P0325 Knock Sensor 1 Circuit Malfunction (Bank 1)
DTC P0330 Knock Sensor 2 Circuit Malfunction (Bank 2)
CIRCUIT DESCRIPTION
Each of 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, 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 ConditionTrouble Area
P0325No knock sensor 1 signal to ECM with engine speed between
2,000 rpm and 5,600 rpm
Open or short in knock sensor 1 circuit

Knock sensor 1 (looseness)

ECM
P0330No knock sensor 1 signal to ECM with engine speed between
2,000 rpm and 5,600 rpm
Open or short in knock sensor 2 circuit

Knock sensor 2 (looseness)

ECM
If the ECM detects the above diagnosis conditions, it operates the fail-safe function in which the corrective
retard angle value is set to the maximum value.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

DTC P0325 is for the right bank knock sensor circuit.

DTC P0330 is for the left bank knock sensor circuit.
DI07T-09

A00304
Knock SensorECM
EB1
Male
ConnectorFemale
Connector 1
111
22KNKR
KNKL
EB1
E4
E427
28
FI7050
S06024
S06025
FI6510FI6607A00113
KNK Signal Waveform
0.5 V
/Division
5 msec./Division
100 msec./Division 0V
200 mV
/Division
0V
- DIAGNOSTICSENGINE
DI-65
221 Author
: Date
:
2001 AVALON (RM808U)

Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for
determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel
ratio was lean or rich, etc. at the time of the malfunction.
1 Connect OBD II scan tool or TOYOTA hand-held tester, and check knock sensor
circuit.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tes-
ter to the DLC3.
(b) Disconnect the wire from wire connector EB1.
(c) Connect the terminals of the disconnected EB1 male con-
nector and EB1 female as follows.
Male connector eFemale connector
Terminal 1 e Terminal 2
Terminal 2 e Terminal 1
(d) Turn the ignition switch ON and push the OBD II scan tool
or TOYOTA 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
Reference: INSPECTION USING OSCILLOSCOPE

With the engine racing (4,000 rpm), check the waveform
between terminals KNKR, KNKL of the ECM connector
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 141 msec. (Normal mode vibration
frequency of knock sensor: 7.1 kHz)
HINT:
If normal mode vibration frequency is not 7.1 kHz, the sensor
is malfunctioning.
Type II Go to step 3.

DI-66
- DIAGNOSTICSENGINE
222 Author
: Date
:
2001 AVALON (RM808U)
Type I
2 Check for open and short in harness and connector between EB1 connector and
ECM (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-30).
3 Check for open and short in harness and connector between EB1 connector and
knock sensor (See page IN-30).
HINT:

If DTC P0325 has changed to P0330, check the knock sensor circuit on the right bank side.

If DTC P0330 has changed to P0325, check the knock sensor circuit on the left bank side.
NG Repair or replace harness or connector.
OK
Replace knock sensor.

- DIAGNOSTICSENGINE
DI-15
171 Author
: Date
:
P0171
(DI-53)System too Lean (Fuel Trim)
Air induction system
Injector blockage
Mass air flow meter
Engine coolant temp. sensor
Fuel pressure
Gas leakage on exhaust system
Open or short in A/F sensor (bank 1, 2 sensor 1) circuit
A/F sensor (bank 1, 2 sensor 1)
ECM

P0172
(DI-53)System too Rich (Fuel Trim)
Injector leak, blockage
Mass air flow meter
Engine coolant temp. sensor
Ignition system
Fuel pressure
Gas leakage on exhaust system
Open or short in A/F sensor (bank 1, 2 sensor 1) circuit
A/F sensor (bank 1, 2 sensor 1)
ECM

P0174
(DI-53)System too Lean
(A/F Lean Malfunction)Same as DTC P0171
P0175
(DI-53)System too Rich
(A/F Rich Malfunction)Same as DTC P0172
P0300
(DI-58)Random/Multiple Cylinder Misfire
Detected
P0301
(DI-58)Cylinder 1 Misfire DetectedOpen or short in engine wire
Connector connection
Vh tiP0302
(DI-58)Cylinder 2 Misfire Detected
Vacuum hose connection
Ignition system

Injector
P0303
(DI-58)Cylinder 3 Misfire Detected
Injector
Fuel pressure
Mass air flow meter
*2
P0304
(DI-58)Cylinder 4 Misfire Detected
Mass air flow meter
Engine coolant temp. sensor
Compression pressure
Vl lP0305
(DI-58)Cylinder 5 Misfire Detected
Valve clearance
Valve timing

ECM
P0306
(DI-58)Cylinder 6 Misfire Detected
ECM
P0325
(DI-64)Knock Sensor 1 Circuit Malfunc-
tion (Bank 1)Open or short in knock sensor 1 circuit
Knock sensor 1 (looseness)
ECM

P0330
(DI-64)Knock Sensor 2 Circuit Malfunc-
tion (Bank 2)Open or short in knock sensor 2 circuit
Knock sensor 2 (looseness)
ECM

P0335
(DI-67)Crankshaft Position Sensor ºAº
Circuit Malfunction
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Crankshaft timing pulley
ECM

P0340
(DI-69)Camshaft Position Sensor Circuit
Malfunction
Open or short in camshaft position sensor circuit
Camshaft position sensor
Camshaft timing gear
ECM

P0420
(DI-71)Catalyst System Efficiency Be-
low Threshold (Bank 1)
Gas leakage on exhaust system
A/F sensor (bank 1, 2 sensor 1)
Heated oxygen sensor (bank 1 sensor 2)
Three-way catalytic converter


DI07C-09
A11424
Knock Sensor 1 DLC1
IAC Valve VSV for EVAP
Engine Coolant
Temp. Sensor
Injector
Crankshaft Position
Sensor
A/F Sensor
(Bank 2 Sensor 1)Park/Neutral Position SwitchDLC3 ECM
Heated Oxygen Sensor
(Bank 1 Sensor 2)
VVT Sensor
(Bank 2)VVT Sensor (Bank 1)
OCV (Bank 2)OCV (Bank 1)
Canister
Vapor Pressure Sensor A/F Sensor
(Bank 1 Sensor 1)
VSV for Pressure Switching Valve VSV for CCV
Ignition Coil
with lgniter
Mass Air Flow Meter
Throttle Position Sensor
Combination Meter
VSV for
No.1 ACIS
VSV for
No.2 ACIS
Knock Sensor 2
- DIAGNOSTICSENGINE
DI-19
175 Author
: Date
:
2001 AVALON (RM808U)
PARTS LOCATION

EM04B-04
A10521
Knock Sensor Connector
Engine Wire Band
Engine WireKnock Sensor
Water Inlet Housing
(With Water Inlet)
No.2 Idler Pulley Bracket
Water Seal Plate
Engine Coolant
Drain Union
Oil Filter Union
Oil Filter  Gasket
Cylinder Block
Side Cover
 Gasket
Water Pump
 Crankshaft
Front Oil Seal
Crankshaft
Position Sensor
Connector
Oil Pressure
Switch
Oil Pressure Switch
Connector
A/C Compressor
Housing Bracket
No.1 Oil Pan
x 17 Oil Pump
 Gasket
 Gasket
Engine WireGenerator
Drain Plugx 10No.2 Oil Pan Oil Strainer
 Non-reusable part
N´m (kgf´cm, ft´lbf): Specified torque
Precoated part

8 (80, 69 in.´lbf)
8 (80, 69 in.´lbf)
10 mm Head 8 (80, 69 in.´lbf)
12 mm Head 19.5 (200, 14)
10 mm Head 8 (80, 69 in.´lbf)
12 mm Head 19.5 (200, 14)
45 (460, 33)
8 (80, 69 in.´lbf)
9 (90, 78 in.´lbf)
x 8
8 (80, 69 in.´lbf)
28 (290, 21)


18 (180, 13)
25 (250, 18)
39 (400, 29)
No.2 ECT Switch
Connector
 O-Ring
x 9
19.5 (200, 14)
- ENGINE MECHANICALCYLINDER BLOCK
EM-81
1065 Author
: Date
:
2001 AVALON (RM808U)
CYLINDER BLOCK
COMPONENTS

P12389
SST
A05253
P18763
WaterSeal
Plate
Oil Filter
Union
12 mm
Hexagon
Wrench
Coolant
Drain
Union
A02010
P12508
EM-84
- ENGINE MECHANICALCYLINDER BLOCK
1068 Author
: Date
:
2001 AVALON (RM808U)
13. REMOVE KNOCK SENSORS
(a) Disconnect the 2 knock sensor connectors.
(b) Using SST, remove the 2 knock sensors.
SST 09816-30010
14. REMOVE WATER INLET HOUSING
(a) Remove the engine wire band.
(b) Disconnect the engine wire clamp from the bracket.
(c) Remove the 8 bolts, 2 nuts and water inlet housing.
15. REMOVE WATER PUMP (See page CO-6)
16. REMOVE NO.2 OIL PAN (See page LU-9)
17. REMOVE OIL STRAINER (See page LU-3)
18. REMOVE NO.1 OIL PAN (See page LU-3)
19. REMOVE OIL PUMP (See page LU-9)
20. REMOVE OIL FILTER (See page LU-3)
21. REMOVE OIL FILTER UNION
Using a 12 mm hexagon wrench, remove the oil filter union.
22. REMOVE WATER SEAL PLATE
Remove the 2 nuts and seal plate.
23. REMOVE ENGINE COOLANT DRAIN UNION
24. REMOVE CYLINDER BLOCK SIDE COVER
Remove the 3 bolts, 2 nuts, cylinder block side cover and gas-
ket.
25. REMOVE REAR OIL SEAL RETAINER
(a) Remove the 6 bolts.
(b) Using a screwdriver, remove the oil seal retainer by prying
the portions between the oil seal retainer and main bear-
ing cap.

P12909
Seal Width 3 - 5 mm
A05253410
2
5
7
93
1
6
8
P12389
SST EM-108
- ENGINE MECHANICALCYLINDER BLOCK
1092 Author
: Date
:
2001 AVALON (RM808U)

Using a non-residue solvent, clean both sealing
surfaces.
(b) Apply seal packing to the water inlet housing as shown in
the illustration.
Seal packing: Part No. 08826-00100 or equivalent

Install a nozzle that has been cut to a 3 - 5 mm (0.12
- 0.20 in.) opening.
HINT:
Avoid applying an excessive amount to the surface.

Parts must be assembled within 3 minutes of ap-
plication. Otherwise the material must be removed
and reapplied.

Immediately remove nozzle from the tube and rein-
stall cap.
(c) Install the water inlet housing with the 8 bolts and 2 nuts.
Uniformly tighten the bolts and nuts in several passes and
in the sequence shown.
Torque: 8 N´m (80 kgf´cm, 69 in.´lbf)
(d) Connect the No.2 ECT switch connector.
(e) Connect the engine wire clamp to the water inlet.
(f) Install the engine wire band.
(g) Install the engine wire clamp.
27. INSTALL KNOCK SENSORS
(a) Using SST, install the 2 knock sensors.
SST 09816-30010
Torque: 39 N´m (400 kgf´cm, 29 ft´lbf)
(b) Connect the 2 knock sensor connectors.
28. INSTALL NO.2 IDLER PULLEY BRACKET
Torque: 28 N´m (290 kgf´cm, 21 ft´lbf)
29. INSTALL A/C COMPRESSOR HOUSING BRACKET
Torque: 25 N´m (250 kgf´cm, 18 ft´lbf)

EM0ZD-02
A05060
Inward
Sensor
A01802
10 mm
Hexagon
Wrench
Plate Washer
A05055
A05061
Fulcrum
Length
SSTSST
RH
- ENGINE MECHANICALTIMING BELT
EM-21
1005 Author
: Date
:
2001 AVALON (RM808U)
INSTALLATION
1. INSTALL CRANKSHAFT TIMING PULLEY
(a) Align the pulley set key with the key groove of the timing
pulley, and slide on the timing pulley.
(b) Install the timing pulley, facing the sensor side inward.
NOTICE:
Do not scratch the sensor part of the crankshaft timing
pulley.
(c) Install the timing belt plate with the bolt.
Torque: 8 N´m (80 kgf´cm, 69 in.´lbf)
2. INSTALL NO.1 IDLER PULLEY
Adhesive: Part No. 08833-00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(a) Using a 10 mm hexagon wrench, install the plate washer
and idler pulley with the pivot bolt.
Torque: 34 N´m (350 kgf´cm, 25 ft´lbf)
(b) Check that the pulley bracket moves smoothly.
3. INSTALL NO.2 IDLER PULLEY
(a) Install the idler pulley with the bolt.
Torque: 43 N´m (440 kgf´cm, 32 ft´lbf)
(b) Check that the idler pulley moves smoothly.
4. INSTALL RH CAMSHAFT TIMING PULLEY
(a) Face the flange side of the timing pulley outward.
(b) Align the knock pin on the camshaft with the knock pin
groove of the timing pulley, and slide on the timing pulley.
(c) Using SST, install the pulley bolt.
SST 09249-63010, 09960-10010 (09962-01000,
09963-01000)
Torque: 88 N´m (900 kgf´cm, 65 ft´lbf)
HINT:
Use a torque wrench with a fulcrum length of 340 mm (13.39
in.).

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.

IN-28
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
28 Author
: Date
:
2001 AVALON (RM808U)
6. CIRCUIT INSPECTION
How to read and use each page is shown below.