Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
Also connect now the MATS, TPS, OSPS, idle by-
pass and TOPS valve to the wiring harness.
Fix the wiring for the MATS with a locking tie to
support the cables.
1
R1503motr204A
1. Locking tie
Install all remaining parts, which has been re-
moved.
THROTTLE POSITION SENSOR
(TPS)
General
The throttle position sensor (TPS) is a potentiome-
ter that sends a signal to the ECM which is propor-
tional to the throttle shaft angle.
1
R1503motr165A
4-TEC ENGINES
1. Throttle position sensor (TPS)
1
R1503motr271A
ALL 4-TEC SUPERCHARGED ENGINES
1. Throttle position sensor (TPS)
IMPORTANT: Prior to testing the TPS, ensure
that mechanical components/adjustments are
adequate according to THROTTLE BODY in AIR
INDUCTION SYSTEM above.
The EMS may generate several fault codes per-
taining to the TPS. Refer to SYSTEM FAULT
CODES in DIAGNOSTIC PROCEDURES section
for more information.
Wear Test
While engine is not running, activate throttle and
pay attention for smooth operation without physi-
cal stops of the cable.
Using the vehicle communication kit (VCK) with
the B.U.D.S. software, use the Throttle Opening
display under Monitoring tab.
Slowly and regularly depress the throttle. Ob-
serve the needle movement. It must change
gradually and regularly as you move the throttle.
If the needle “sticks”, bounces, suddenly drops
or if any discrepancy between the throttle move-
ment and the needle movement is noticed, it
indicates a worn TPS that needs to be replaced.
Voltage Test
Check the ECM voltage output from to the throttle
position sensor.
Disconnect connector from throttle position sen-
sor. To unlock connector, insert a small screwdriv-
er between the folded tab.
smr2004-Complete Line Up 421
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