Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
F19H03A
1
2
1. Knock sensor adaptor
2. Unplug connector and measure resistance here
NOTE: If there is no sensor adaptor, it is important
to refer to Warranty Bulletin No. 2004-4 to install
the adaptor to prevent potential engine failure.
Static Resistance Test
Using a multimeter, check the resistance between
both terminals on the knock sensor harness side.
The resistance should be approximately 5 M
.
If resistance is not good, replace knock sensor.
If resistance is good, reconnect the knock sensor
connector WITHOUT reconnecting sensor adaptor
then disconnect the ECM connector A from ECM.
Using a multimeter, recheck resistance value be-
tween terminals 9 and 23.
R1503motr188A
9
23
If wiring harness is good, test the sensor adaptor.
Usinganohmmeter,measuretheresistorsas
shown in the following illustration.
F19H04A
1
YELLOW/GREEN
19 000 - 21 000 W
1710 - 1890 W
1. Knock sensor adaptor
Replace sensor adaptor if resistors are not within
values.
If sensor adaptor is good, try a new ECM. Refer
to ECM REPLACEMENT procedures elsewhere in
this section.
Otherwise, repair the connector or replace the
wiring harness between ECM connector and
knock sensor.
Ensure to reconnect sensor adaptor between
knock sensor and harness coming from ECM.
Replacement
Remove the intake manifold. Refer to INTAKE
MANIFOLD REPLACEMENT in INTAKE section.
Unscrew and remove knock sensor.
Clean contact surface, apply Loctite 243 in thread-
ed hole then install the new knock sensor.
Torque screw to 24 N•m(18lbf•ft).
CAUTION: Improper torque might prevent sen-
sor to work properly and lead engine to severe
damage of internal components.
Replug connector.
430 smr2004-Complete Line Up
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