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DI-626
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRI-02
DTC P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or
Single Sensor)
DTC P0328 Knock Sensor 1 Circuit High Input (Bank 1
or Single Sensor)
DTC P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
DTC P0333 Knock Sensor 2 Circuit High Input (Bank 2)
CIRCUIT DESCRIPTION
A flat type knock sensor (non-resonant type) has the structure that can detect the vibration in a wider band
of frequency from about 6 kHz to 15 kHz and has the following features.
Knock sensors are fitted on the right bank and left bank of the cylinder block to detect engine knocking.
Each knock sensor contains a piezoelectric element which generates voltage when it becomes deformed.
Generation of the voltage occurs when the cylinder block vibrates due to knocking. If engine knocking oc-
curs, the ignition timing is retarded in order to suppress the knocking.
DTC No. DTC Detection Condition Trouble Area
S Short in knock sensor 1 or 2 circuit
P0327 Output voltage of the knock sensor 1 or 2 is 0.5 V or less
S Knock sensor 1 or 2
P0332 (1 trip detection logic)
S ECM
S Open in knock sensor 1 or 2 circuit
P0328 Output voltage of the knock sensor 1 or 2 is 4.5 V or more
S Knock sensor 1 or 2
P0333 (1 trip detection logic)
S ECM
KNK1 Signal Waveform 1V/ DIV Reference: Inspection using the oscilloscope.
The correct waveform is as shown.
Item Details
KNK1 - EKNK
GND Terminal or
KNK2 - EKN2
0.01 to 10 V/Division,
Equipment Settings
0.01 to 10 msec./Division
After warming up the engine,
1 msec./ Division Condition
A23648 keep the engine speed at 4,000 rpm.
DI-627
DIAGNOSTICS - ENGINE (2UZ-FE)
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.
If there is a defect in the knock sensor or an open or short circuit, the voltage level will deviate outside the
normal operating range. The ECM interprets this deviation as a defect in the knock sensor and sets a DTC.
Example:
When the knock sensor voltage output is less than 0.5 V, or more than 4.5 V, and if either the condition contin-
ues for more than 3 sec.
MONITOR STRATEGY
Knock sensor (Bank 1) range check (Low volt-
P0327
age)
Knock sensor (Bank 1) range check (High volt-
P0328
age)
Related DTC
R l t d DTCs
Knock sensor (Bank 2) range check (Low volt-
P0332
age)
Knock sensor (Bank 2) range check (High volt-
P0333
age)
Main sensors/components Knock sensor
Crankshaft position sensor, Camshaft position
Required sensors/components
Related sensors/components sensor, Engine coolant temperature sensor,
Mass air flow meter
Frequency of operation Continuous
Duration 1 sec.
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-437
not present
Battery voltage 10.5 V -
Time after engine start 5 sec. -
Ignition switch ON
Starter OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Knock sensor range check (Low voltage) P0327, P0332:
Knock sensor voltage Less than 0.5 V
Knock sensor range check (High voltage) P0328, P0333:
Knock sensor voltage More than 4.5 V
DI-628
DIAGNOSTICS - ENGINE (2UZ-FE)
WIRING DIAGRAM
ECM
K2
Knock Sensor
(Bank 2) (*1) 3 (*1) 20
2 B EC3 B E6 EKN2
4 21
1 W W
EC3 E6 KNK2
K1
Knock Sensor
(Bank 1) (*1) (*1)
7 28
2 R EC3 R E6 EKNK
8 29
1 G G
EC3 E6 KNK1
(*1) 2
BR (*1)
EC3
BR
E
J64
J/C
E
BR
EY (*2)
*1: Shielded EW (*3)
*2: Double Cab
*3: Access Cab, Standard Cab
A23600
DI-629
DIAGNOSTICS - ENGINE (2UZ-FE)
INSPECTION PROCEDURE
HINT:
S DTC P0325, P0327 and P0328 are for the bank 1 knock sensor circuit.
S DTC P0330, P0332 and P0333 are for the bank 2 knock sensor circuit.
S 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, and other data from the time the malfunction occurred.
1 Connect hand-held tester, and check knock sensor circuit.
PREPARATION:
EC3 ECM (a) Disconnect the EC3 connector.
Knock Sensor (b) Using lead wires, connect the EC3 connectors as follows.
29
4 4 E6 KNK1 Male Connector - Female Connector
1 2
28 EKNK Terminal 4 - Terminal 8
3 3 E6
Terminal 3 - Terminal 7
21
KNK2
8 8 E6 Terminal 8 - Terminal 4
1 2 20 EKN2 Terminal 7 - Terminal 3
7 7 E6
(c) Warm up the engine.
(d) Run the engine at 3,000 rpm for 10 seconds or more.
CHECK:
EC3 (a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand-held tes-
ter ON.
(c) Select the item: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
Male Female (d) Read DTCs.
Connector Connector A23476 Result :
Display Proceed to
DTCs same as when vehicle brought in
P0325, P0327, P0328 P0325, P0327, P0328
A
or
P0330, P0332, P0333 P0330, P0332, P0333
DTC different from when vehicle brought in
P0325 P0330
B
or
P0330 P0325
DTCs different from when vehicle brought in
P0327, P0328 P0332, P0333
C
or
P0332, P0333 P0327, P0328
(e) Reconnect the EC3 connector.
B Go to step 4.
C Go to step 5.
DI-630
DIAGNOSTICS - ENGINE (2UZ-FE)
A
2 Check for open and short in harness and connector between EC3 connector and
ECM (See page IN-30).
NG Repair or replace harness or connector.
OK
3 Measure voltage between terminals KNK1 and EKNK, KNK2 and EKN2 of ECM.
PREPARATION:
(a) Disconnect the E6 ECM connector.
KNK2 EKN2
(b) Turn the ignition switch to ON.
CHECK:
(a) Measure the voltage between the specified ECM termi-
nals.
E6 OK:
KNK1 EKNK Standard:
B17411 Tester Connection Specified Condition
KNK1 (E6-29) - EKNK (E6-28) 4.5 to 5.5 V
KNK2 (E6-21) - EKN2 (E6-20) 4.5 to 5.5 V
(b) Reconnect the ECM connector.
NG Replace ECM (See page SF-82).
OK
Check for intermittent problems
(See page DI-430).
4 Check knock sensor installation.
CHECK:
Check the knock sensor installation.
OK:
Torque: 20 Nm (204 kgfcm, 15 ftlbf)
NG Tighten the sensor.
DI-631
DIAGNOSTICS - ENGINE (2UZ-FE)
OK
Replace knock sensor (See page SF-68).
5 Check knock sensor.
Wire Harness Side: PREPARATION:
Male Connector (a) Disconnect the EC3 connector.
CHECK:
EC3
(a) Check the resistance between the terminals of the EC3
male connector.
OK:
Standard:
Tester Connection Specified Condition
Front View
A23513 EC3 male connector 3 -4 120 to 280 k
EC3 male connector 7 - 8 120 to 280 k
(b) Reconnect the EC3 connector.
OK Check for intermittent problems
(See page DI-430).
NG
6 Check for open and short in harness and connector between EC3 connector and
knock sensor (See page IN-30).
HINT:
S If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right
bank side.
S If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left
bank side.
NG Repair or replace harness or connector.
OK
Replace knock sensor.
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