Lexus ES300 (2002 year). Service manual — part 364

A53763

#30

E2

#60

#20 #10

#50

#40

FI6588 FI6538

Injector Signal Waveform

(Magnification)

10V
/Division

GND

100 msec./Division (Idling)

Injection duration

10V
/Division

GND

1 msec./Division (Idling)

A00064

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-75

228

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

4

INSPECT ECM

(a)

Turn the ignition switch ON.

(b)

Measure the voltage between #10-#60 and E2 terminal
of the ECM connector.
Voltage: 9 - 14 V

HINT:
With the engine idling, check the waveform between terminals
#10 - #60 and E01 of the ECM connector.

OK

Go to step 7

NG

5

INSPECT FUEL INJECTOR ASSY(RESISTANCE) (See page

11-7

)

NG

REPLACE FUEL INJECTOR ASSY

OK

6

CHECK FUEL PRESSURE (See page

11-4

)

NG

REPAIR OR REPLACE FUEL SYSTEM

OK

CHECK HARNESS AND CONNECTOR

05-76

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

229

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

7

INSPECT FUEL INJECTOR ASSY(INJECTION) (See page

11-7

)

NG

REPLACE FUEL INJECTOR ASSY

OK

8

INSPECT INTAKE AIR FLOW METER SUB-ASSY (See page

10-2

)

NG

REPAIR OR REPLACE INTAKE AIR FLOW
METER SUB-ASSY

OK

9

INSPECT E.F.I. ENGINE COOLANT TEMPERATURE SENSOR (See page

10-2

)

NG

REPAIR OR REPLACE E.F.I. ENGINE COOLANT
TEMPERATURE SENSOR

OK

CHECK COMPRESSION PRESSURE, VALVE CLEARANCE AND VAIVE TIMING

A57001

Knock Control Sensor 1
(on Right Bank)

Knock Control Sensor 2
(on Left Bank)

2

EB1

2

E9

1

1

1

3

4

EB1

EB1

EB1

(*1)

W

B

W

E9

1

ECM

KNKR

KNKL

E1

E1

E8

1

(*1)

(*1)

(*1)

W

*1: Shielded

E1

BR

EF

A

A

J11 J/C

BR

A

BR

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-77

230

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

DTC

P0325

KNOCK SENSOR1 CIRCUIT MALFANCTION
(BANK1)

DTC

P0330

KNOCK SENSOR2 CIRCUIT MALFANCTION
(BANK2)

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 Condition

Trouble Area

P0325

No 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 control sensor 1 (looseness)

ECM

P0330

No 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 control 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

051M7-06

A52111

A53763

E2

KNKL

KNKR

A05134

05-78

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

231

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

INSPECTION PROCEDURE

HINT:

DTC P0325 is for the right bank knock sensor circuit.

DTC P0330 is for the left bank knock sensor circuit.

Read freeze frame data using 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 deter-
mining 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

CHECK KNOCK SENSOR CIRCUIT

(a)

Disconnect the wire from wire connector .

(b)

Connect the terminals of the disconnected EB1 male con-
nector and EB1 female as follows.

Male connector

⇔

Female connector

Terminal 1

⇔

Terminal 2

Terminal 2

⇔

Terminal 1

(c)

Turn the ignition switch ON and push the OBD II scan tool
or hand-held tester main switch ON.

(d)

After the engine is warmed up, perform quick racing to
4,000 rpm 3 times.
Result:

A

DTC same as when vehicle brought in

P0325

→

P0325 or P0330

→

P0330

B

DTC different to when vehicle brought in

P0325

→

P0330 or P0330

→

P0325

(e)

Check the output waveform.

HINT:

Item

Contents

Terminal

KNKL, KNKR

⇔

E2

Equipment Set

0.5V/DIV, 1ms/DIV

Condition

After warming up the engine,

keep the engine speed 4,000 rpm.

B

Go to step 3

A