Toyota Sequoia (2005). Manual - part 100

S01196

S01699

30

20

10

5

3

0

20 40

0.1

1

0.3
0.2

0.5

2

60 80 100

–20

(–4)

(104) (140) (176)

(32) (68)

(212)

A21042

Ohmmeter

Acceptable

TEMPERATURE 



C (



F)

RESIST

ANCE K

Ω

–

DIAGNOSTICS

ENGINE

DI–203

397

18

Check engine coolant temperature sensor.

PREPARATION:
Remove the engine coolant temperature sensor.
CHECK:
Measure the resistance between the terminals of the engine
coolant temperature sensor.

Resistance:

Tester Connection

Specified Condition

1 – 2

2.32 to 2.59 k

Ω

 (20



C (68



F))

1 – 2

0.310 to 0.326 k

Ω

 (80



C (176



F))

NOTICE:
In case of checking the engine coolant temperature sensor
in the water, be careful not to allow water to go into the ter-
minals. After checking, dry the sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed en-
gine coolant temperature sensor and read the resistance. Use
an infrared thermometer to measure the engine temperature in
the immediate vicinity of the sensor. Compare these values to
the resistance/temperature graph. Change the engine temper-
ature (by warming up or cooling down) and repeat the test.

NG

Replace 

engine coolant temperature sensor.

OK

19

Switch step by number of misfire cylinder (Refer to the result of step 4).

High misfire rate cylinder

Proceed to

1 or 2 cylinders

A

More than 3 cylinders

B

B

Go to step 5.

A

Check for intermittent problems 
(See page 

DI–11

).

DI–204

–

DIAGNOSTICS

ENGINE

398

DTC

P0325

Knock Sensor 1 Circuit (Bank 1 or Single
Sensor)

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

P0330

Knock Sensor 2 Circuit (Bank 2)

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

P0325
P0330

Knock sensor signal level remains at low

(1 trip detection logic)

Knock sensor 1 or 2

Knock sensor 1 or 2 (looseness)

ECM

P0327
P0332

Output voltage of the knock sensor 1 or 2 is 0.5 V or less

(1 trip detection logic)

Short in knock sensor 1 or 2 circuit

Knock sensor 1 or 2

ECM

P0328
P0333

Output voltage of the knock sensor 1 or 2 is 4.5 V or more

(1 trip detection logic)

Open in knock sensor 1 or 2 circuit

Knock sensor 1 or 2

ECM

DIDFS–01

A23648

GND

1V/ DIV

KNK1 Signal Waveform

1 msec./ Division

–

DIAGNOSTICS

ENGINE

DI–205

399

Reference: Inspection using the oscilloscope. 
The correct waveform is as shown.

Item

Details

Terminal

KNK1 – EKNK

or

KNK2 – EKN2

Equipment Settings

0.01 to 10 V/Division, 

0.01 to 10 msec./Division

Condition

After 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

P0325

Knock sensor (Bank 1) range check (Chattering)

P0327

Knock sensor (Bank 1) range check (Low volt-

age)

R l t d DTC

P0328

Knock sensor (Bank 1) range check (High volt-

age)

Related DTCs

P0330

Knock sensor (Bank 2) range check (Chattering)

P0327

Knock sensor (Bank 2) range check (Low volt-

age)

P0328

Knock sensor (Bank 2) range check (High volt-

age)

Main sensors/components

Knock sensor

Required sensors/components

Related sensors/components

Crankshaft position sensor, Camshaft position

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

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these

DTCs are not present

See page 

DI–18

Battery voltage

10.5 V

–

Time after engine start

5 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

20

KNK2

E7

BR

7

2

EB4

EB4

2

3

EB

EC

1

BR

BR

BR

E

(Shielded)

BR

(Shielded)

EB4

EB4

EB4

(Shielded)

(Shielded)

2

G

R

W

W

G

R

EKN2

EKNK

E1

E6

E7

E7

29

28

BR

E

D

D

J42
J/C

J42
J/C

DI–206

–

DIAGNOSTICS

ENGINE

400

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

Knock sensor range check (Chattering) P0325, P0330:

Knock sensor voltage

Less than 0.5 V, or more than 4.5 V

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

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.