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DI-197
DIAGNOSTICS - ENGINE (1GR-FE)
DIDUJ-01
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
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
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
A23675 keep the engine speed at 4,000 rpm.
DI-198
DIAGNOSTICS - ENGINE (1GR-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 these
See page DI-18
DTCs are 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-199
DIAGNOSTICS - ENGINE (1GR-FE)
WIRING DIAGRAM
K1 ECM
Knock Sensor 1
(Bank 1) 5V
2 29
B G KNK1
EF2 E6
1 2
(*1)
5 28
W R EKNK
EF2 E6
(*1)
1
K2 (*1) BR BR (*1)
Knock Sensor 2 EF2
BR (*1)
(Bank 2) 5V
(*1) 4 21
G W (*1) KNK2
EF2 E6
1 2
(*1) 6 (*1) 20
R B EKN2
EF2 E6
E
BR BR
E E
EV
J65
J/C *1: Shielded
A23569
INSPECTION PROCEDURE
HINT:
S DTC P0327 and P0328 are for the bank 1 knock sensor circuit.
S DTC 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.
DI-200
DIAGNOSTICS - ENGINE (1GR-FE)
1 Connect hand-held tester, and check knock sensor circuit.
PREPARATION:
EF2 ECM (a) Disconnect the EF2 connector.
Knock Sensor (b) Using lead wires, connect the EF2 connectors as follows.
29
KNK1 Male Connector - Female Connector
5 5 E6
1 2
28 EKNK Terminal 5 - Terminal 6
2 2 E6
Terminal 2 - Terminal 4
21 KNK2
6 6 E6 Terminal 6 - Terminal 5
1 2 20 EKN2 Terminal 4 - Terminal 2
4 4 E6
(c) Warm up the engine.
Male Female (d) Run the engine at 3,000 rpm for 10 seconds or more.
Connector EF2 Connector CHECK:
(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.
(d) Read DTCs.
A23676
Result :
Display Proceed to
DTCs same as when vehicle brought in
P0327, P0328 P0327, P0328
A
or
P0332, P0333 P0332, P0333
DTCs different from when vehicle brought in
P0327, P0328 P0332, P0333
B
or
P0332, P0333 P0327, P0328
(e) Reconnect the EF2 connector.
B Go to step 4.
A
DI-201
DIAGNOSTICS - ENGINE (1GR-FE)
2 Check for open and short in harness and connector between EF2 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:
Measure the voltage between the specified ECM terminals.
OK:
E6 Standard:
KNK1 EKNK Tester Connection Specified Condition
B17411 KNK1 (E6-29) - EKNK (E6-28) 4.5 to 5.5 V
KNK2 (E6-21) - EKN2 (E6-20) 4.5 to 5.5 V
(a) Reconnect the ECM connector.
NG Replace ECM (See page SF-66).
OK
Check for intermittent problems
(See page DI-11).
DI-202
DIAGNOSTICS - ENGINE (1GR-FE)
4 Check knock sensor.
Wire Harness Side: PREPARATION:
Disconnect the EF2 connector.
Male Connector CHECK:
(a) Check the resistance between the terminals of the EF2
EF2
male connector.
OK:
Standard:
Front View Tester Connection Specified Condition
A23674 EF2 male connector 2 -5 120 to 280 k
EF2 male connector 4 - 6 120 to 280 k
(b) Reconnect the EF2 connector.
OK Check for intermittent problems
(See page DI-11).
NG
5 Check for open and short in harness and connector between EF2 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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