
Subsection 01 (ELECTRONIC FUEL INJECTION (EFI))
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Step 1: Loosen
Step 2: Rotate
Testing the TPS Wear
IMPORTANT
: Prior to testing the TPS, ensure
that mechanical components of throttle body are
checked.
While engine is not running, activate throttle and
pay attention for smooth operation without phys-
ical stops of the cable.
Using the B.U.D.S. software, use the Throttle
Opening display under Monitoring.
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Slowly and regularly depress the throttle. Ob-
serve the needle movement. It must change
gradually and regularly as you move the throt-
tle. If the needle “sticks”, bounces, suddenly
drops or if any discrepancy between the throttle
movement and the needle movement is noticed,
it indicates that the TPS needs to be replaced or
the computer used may be too slow to transfer
data fast enough for real time display.
Testing the TPS Resistance
Ensure correct throttle cable adjustment. Refer to
THROTTLE CABLE ADJUSTMENT
in this subsec-
tion.
Ensure TPS is connected to wiring harness.
Disconnect the ECM connector.
Using the ECM adapter tool and a multimeter,
check resistance values.
ECM ADAPTER
THROTTLE
IDLE
POSITION
WIDE OPEN
THROTTLE
POSITION
PIN
RESISTANCE ( ) @ 20°C
(68°F)
G3
G2
900-1600
2600-3100
G2
A1
1800-2200
1800-2200
G3
A1
2200-3100
800-1200
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NOTE:
The
resistance
value
should
change
smoothly and proportionally to throttle move-
ment. Otherwise, replace TPS.
If resistance values are correct, perform the
TPS
INPUT VOLTAGE TEST
below.
If resistance values are incorrect, check wiring
harness. If wiring is faulty, repair/replace. If
wiring is good, replace TPS.
Reconnect ECM connector.
Testing the TPS Input Voltage
Disconnect connector from TPS.
Turn ignition key ON.
Set emergency engine stop switch to RUN.
Check the voltage readings from harness connec-
tor as follows.
ENGINES
CONNECTION
VOLTAGE
570 and 650
Pin 1 with
battery ground
850 and 1000R
Pin 3 with
battery ground
5.0 V
All
Pin 2 with
battery ground
0 V
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