2001 TOYOTA SEQUOIA O2 sensor

A23648
GND 1V/ DIV KNK1 Signal Waveform
1 msec./ Division
± DIAGNOSTICSENGINE
DI±205
399 Author: Date:
2005 SEQUOIA (RM1146U)
Reference: Inspection using the oscilloscope.
The correct waveform is as shown.
ItemDetails
Terminal
KNK1 ± EKNK
or
KNK2 ± EKN2
Equipment Settings0.01 to 10 V/Division,
0.01 to 10 msec./Division
ConditionAfter warming up the engine,
keep the engine speed at 4,000 rpm.
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
P0325Knock sensor (Bank 1) range check (Chattering)
P0327Knock sensor (Bank 1) range check (Low volt-
age)
RltdDTC
P0328Knock sensor (Bank 1) range check (High volt-
age)
Related DTCsP0330Knock sensor (Bank 2) range check (Chattering)
P0327Knock sensor (Bank 2) range check (Low volt-
age)
P0328Knock sensor (Bank 2) range check (High volt-
age)
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
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
Battery voltage10.5 V±
Time after engine start5 sec.±

A23549
ECU
KNK1 21
E7
B GR
4 K1
Knock Sensor 1
(Bank 1)B 8
1 K2
Knock Sensor 2
(Bank 2)
1
20KNK2
E7
BR7
2
EB4 EB4
23
EB
EC 1
BR BR
BR
E (Shielded)
BR (Shielded)
EB4 EB4
EB4(Shielded)
(Shielded)
2G
RWW
G
REKN2
EKNK
E1 E6 E7
E7 29
28
BRE D
DJ42
J/C J42
J/C DI±206
± DIAGNOSTICSENGINE
400 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Knock sensor range check (Chattering) P0325, P0330:
Knock sensor voltageLess than 0.5 V, or more than 4.5 V
Knock sensor range check (Low voltage) P0327, P0332:
Knock sensor voltageLess than 0.5 V
Knock sensor range check (High voltage) P0328, P0333:
Knock sensor voltageMore than 4.5 V
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

DTC P0325, P0327 and P0328 are for the bank 1 knock sensor circuit.

DTC P0330, P0332 and P0333 are for the bank 2 knock sensor circuit.

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.

A23476
ECM EB4
EB4
Female
Connector Male
Connector Knock Sensor
83 4
783 4
7 2 1
2 1
E7
E7
E7
E728
21
20KNK1
EKNK
KNK2
EKN2 29
± DIAGNOSTICSENGINE
DI±207
401 Author: Date:
2005 SEQUOIA (RM1146U)
1 Connect hand±held tester, and check knock sensor circuit.
PREPARATION:
(a) Disconnect the EB4 connector.
(b) Using lead wires, connect the EB4 connectors as follows.
Male Connector ± Female Connector
Terminal 4 ± Terminal 8
Terminal 3 ± Terminal 7
Terminal 8 ± Terminal 4
Terminal 7 ± Terminal 3
(c) Warm up the engine.
(d) Run the engine at 3,000 rpm for 10 seconds or more.
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.
Result :
DisplayProceed to
DTCs same as when vehicle brought in
P0325, P0327, P0328 " P0325, P0327, P0328
or
P0330, P0332, P0333 " P0330, P0332, P0333
A
DTC different from when vehicle brought in
P0325 " P0330
or
P0330 " P0325
B
DTCs different from when vehicle brought in
P0327, P0328 " P0332, P0333
or
P0332, P0333 " P0327, P0328
C
(e) Reconnect the EB4 connector.
B Go to step 4.
C Go to step 5.
A

B17411
KNK1
KNK2EKN2
EKNK E7
DI±208
± DIAGNOSTICSENGINE
402 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check for open and short in harness and connector between EB4 connector and
ECM (See page IN±35).
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 E7 ECM connector.
(b) Turn the ignition switch to ON.
CHECK:
(a) Measure the voltage between the specified ECM termi-
nals.
OK:
Standard:
Tester ConnectionSpecified Condition
KNK1 (E7±29) ± EKNK (E7±28)4.5 to 5.5 V
KNK2 (E7±21) ± EKN2 (E7±20)4.5 to 5.5 V
(b) Reconnect the ECM connector.
NG Replace ECM (See page SF±80).
OK
Check for intermittent problems
(See page DI±11).
4 Check knock sensor installation.
CHECK:
Check the knock sensor installation.
OK:
Torque: 20 NVm (204 kgfVcm, 15 ftVlbf)
NG Tighten the sensor.
OK

A23513
Male Connector
EB4
Wire Harness Side:
Front View
± DIAGNOSTICSENGINE
DI±209
403 Author: Date:
2005 SEQUOIA (RM1146U)
Replace knock sensor (See page SF±66).
5 Check knock sensor.
PREPARATION:
(a) Disconnect the EB4 connector.
CHECK:
(a) Check the resistance between the terminals of the EB4
male connector.
OK:
Standard:
Tester ConnectionSpecified Condition
EB4 male connector 3 ±4120 to 280 kW
EB4 male connector 7 ± 8120 to 280 kW
(b) Reconnect the EB4 connector.
OK Check for intermittent problems
(See page DI±11).
NG
6 Check for open and short in harness and connector between EB4 connector and
knock sensor (See page IN±35).
HINT:

If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right
bank side.

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.

FI7059
FI7060A00069
G2 and NE Signal Waveforms
20 msec./Division (Idling)
10 msec./Division (Idling)5 V
/Division
G2
NE
5 V
/Division
G2
NE DI±210
± DIAGNOSTICSENGINE
404 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0335 Crankshaft Position Sensor ºAº Circuit
DTC P0339 Crankshaft Position Sensor ºAº Circuit In-
termittent
CIRCUIT DESCRIPTION
The crankshaft position sensor system consists of a crankshaft position sensor plate and a pick±up coil.
The sensor plate has 32 teeth and is installed on the crankshaft. The pick±up coil is made of an iron core
and magnet. The sensor plate rotates and as each tooth passes through the pick±up coil, a pulse signal is
created. The pick±up coil generates 32 signals for each engine revolution. Based on these signals, the ECM
calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and igni-
tion timing are controlled.
DTC No.DTC Detecting ConditionTrouble Area
P0335
No crankshaft position sensor signal to ECM during crank-
ing (2 trip detection logic)
Open or short in crankshaft position sensor circuit

Crankshaft position sensor
P0335No crankshaft position sensor signal to ECM with engine
speed 450 rpm or more (1 trip detection logic)

Crankshaft osition sensor

Signal plate

ECM
P0339
In condition (a), (b) and (c), when no crankshaft position
sensor (NE) signal is input for 0.05 sec. or more. :
(1 trip detection logic)
(c) Engine revolution 1,000 rpm or more
(d) STA signal is OFF
(e) 3 sec. or more has lapsed after STA signal is switched
from ON to OFF.

Open or short in crankshaft position sensor circuit

Crankshaft position sensor

Signal plate

ECM
Reference: Inspection using the oscilloscope.
The correct waveform is as shown in the illustration.
Tester ConnectionSpecified Condition
VV1+ (E6±25) ± VV1± (E6±24)
VV2+ (E6±18) ± VV2± (E6±28)Correct waveform is as shown
NE+ (E6±21) ± NE± (E6±20)
Correct waveform is as shown
DID86±01

± DIAGNOSTICSENGINE
DI±211
405 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
If there are no signals from the crankshaft sensor even though the engine is revolving, the ECM interprets
this as a malfunction of the sensor.
MONITOR STRATEGY
Related DTCsP0335Crankshaft position sensor range check or ratio-
nality
Rid / tMain sensors/componentsCrankshaft position sensorRequired sensors/componentsRelated sensors/componentsEngine speed sensor
Frequency of operationContinuous
DurationCase 1: 0.016 sec.
Case 2: 3 times
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Case 1:
Engine speed450 rpm±
StarterOFF
Time after starter ON to OFF3 sec.±
Case 2:
Time after starter ON to OFF0.3 sec.±
Number of camshaft position sensor sig-
nal pulse3±
Battery voltage7 V±
Ignition switchON
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Case 1:
Engine speed signalNo signal for 0.016 sec.
Case 2:
Number of crankshaft position sensor signal pulse44 or less, or 58 or more

A19690
C1
Camshaft Position Sensor
C2
Crankshaft Position SensorLECM
NE+
NE±
E2 27
2 12 1
25
24 Y
R GE6
G2+
G2±
32
E6
E6
E6
*1: ShieldedE6E1
EC (*1) (*1)
J42 J/C
A
AA
BR
BR
BR1 DI±212
± DIAGNOSTICSENGINE
406 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM