Lexus ES300 (1997 year). Service manual — part 321
–
DIAGNOSTICS
ENGINE
DI–61
213
1997 LEXUS ES300 (RM511U)
5
Check injector injection (See page
NG
Replace injector.
OK
6
Check EGR system (See page
NG
Replace EGR system.
OK
7
Check mass air flow meter and engine coolant temp. sensor
(See page
NG
Repair or replace.
OK
Check compression pressure, valve
clearance and valve timing.
FI6610
Knock Sensor 1
(On right bank)
Knock Sensor 2
(On left bank)
EC1
1
1
W
W
1
2
W
W
E9
E9
ECM
15
14
KNKR
KNKL
E1
E1
EC1
DI–62
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DIAGNOSTICS
ENGINE
214
1997 LEXUS ES300 (RM511U)
DTC
P0325
Knock Sensor 1 Circuit Malfunction
DTC
P0330
Knock Sensor 2 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensors are fitted one 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 sensor 1 (looseness)
ECM
P0330
No knock sensor 2 signal to ECM with engine speed between
2,000 rpm and 5,600 rpm
Open or short in knock sensor 2 circuit
Knock 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
DI09P–01
A00304
Knock Sensor
ECM
EC1
Male
Connector
Female
Connector
1
1
1 1
2 2
KNKR
KNKL
EC1
E9
E9
15
14
FI7050
S06024
S06025
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DIAGNOSTICS
ENGINE
DI–63
215
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
HINT:DTC P0325 is for the right bank knock sensor circuit. DTC P0330 is for the left bank knock sensor cir-
cuit.
1
Connect OBD II scan tool or LEXUS hand–held tester and check knock sensor
circuit.
PREPARATION:
(a)
Connect the OBD II scan tool or LEXUS hand–held tester
to the DLC3.
(b)
Disconnect the wire to wire connector EC1.
(c)
Connect the terminals of the disconnected EC1 male con-
nector and EC1 female as follows.
Male connector
↔
Female connector
Terminal 1
↔
Terminal 2
Terminal 2
↔
Terminal 1
(d)
Turn ignition switch ON and switch the OBD II scan tool
or LEXUS hand–held tester main switch ON.
(e)
After the engine is warmed up, perform quick racing to
4,000 rpm three times.
CHECK:
Check the DTC.
RESULT:
Type I
DTC same as when vehicle brought in.
P0325
→
P0325 or P0330
→
P0330
Type II
DTC different to when vehicle brought in.
P0325
→
P0330 or P0330
→
P0325
Type II
Go to step 3 .
Type I
DI–64
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DIAGNOSTICS
ENGINE
216
1997 LEXUS ES300 (RM511U)
2
Check for open and short in harness and connector between EC1 connector and
ECM (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace ECM (See page
).
3
Check for open and short in harness and connector between EC1 connector and
knock sensor (See page
HINT:
If DTC P0325 has changed to P0330, check the knock sensor circuit on the right bank side.
If DTC P0330 has changed to P0325, 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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