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Section 04 ENGINE MANAGEMENT (1503 4-TEC)
Subsection 03 (COMPONENT INSPECTION, REPLACEMENT AND ADJUSTMENT)
Replacement
Disconnect EGTS connector and remove EGTS.
Apply Loctite 518 on threads of the EGTS then
install.
Replug connector.
KNOCK SENSOR (KS)
1
R1503motr174A
1. Knock sensor (KS)
Dynamic Test
Using the vehicle communication kit (VCK) with
the B.U.D.S. software, monitor the knock sensor
using the FAULTS section.
Start the engine and bring engine RPM above
5000 RPM. If no fault code occurs, the knock
sensor is good.
Otherwise, do the following.
Ensure sensor and cylinder head contact surfaces
are clean and mounting bolt and washer are cor-
rect and properly torqued down.
NOTE:
It is necessary to remove intake manifold
to inspect contact surfaces. Refer to the
1503
4-TEC ENGINE SHOP MANUAL
.
Check the knock sensor resistance.
Disconnect the connector from knock sensor har-
ness.
Static Resistance Test
Using a multimeter, check the resistance between
both terminals on the knock sensor.
The resistance should be approximately 5 M .
If resistance is not good, replace knock sensor.
If resistance is good, disconnect the ECM connec-
tor A from ECM.
smr2005-013-002_a
1. ECM “A” connector
2. Knock sensor connector (harness side)
Using a multimeter, check resistors inside har-
ness. Measure resistance values as per following
table.
NOTE:
Only Supercharged Intercooled engines
have resistors in the harness. On other engines,
check the continuity of harness.
ECM “A”
CONNECTOR
KNOCK SENSOR
CONNECTOR
(HARNESS SIDE)
RESISTANCE
Pin A-9
Pin 1
1710 - 1890
Pin A-23
Pin 2
19000 - 21000
—
Pin 1 and pin 2
1710 - 1890
Repair/replace resistor/harness/connector if resis-
tance measurement are not within values.
If harness is good, try a new ECM. Refer to ECM
AND MPEM in this section.
Replacement
Remove the intake manifold. Refer to INTAKE in
the
1503 4-TEC ENGINE SHOP MANUAL
.
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 (18 lbf•ft).
smr2005-013
127
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