Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 600 / 1976

A09082
Knock Sensor 1
(On right bank)
Knock Sensor 2
(On left bank)
EA1
1 W
W
1
2
W
W
ECM
KNKR
KNKL
E1
E1
EA1
1
E12
E12
28
27
EA1
EA1
3
4
A
A
A
J14
J/C
BR
EC
DI-62
- DIAGNOSTICS ENGINE
216
Author: Date:
2001 SIENNA (RM787U)
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
INSPECTION PROCEDURE
HINT:
DTC P0325 is for the right bank knock sensor circuit. DTC P0330 is for the left bank knock sensor cir-
cuit.
DI226-03