200 KENR9126
Troubleshooting Section
Expected Result:
Each resistance measurement indicates an open
circuit.
Results:
•
OK – Each resi
stance measurement indicates an
open circuit. Connect the P1 connectors. Proceed
to Test Step 6.
•
Not OK – At least one resistance measurement
does not indicate an open circuit.
Repair: There is a problem with the signal wire for
the throttle position sensor. The problem could be
in the wiri
ng or in a connector. Repair the wiring
and/or the connector, when possible. Replace
parts, if necessary. Verify that the problem is
resolved.
STOP.
Test Step 5. Check the Signal Wire for an
Open Circuit
Note: Be
sure to wiggle the harnesses during the
following measurement. Be sure to wiggle each
harness near each connector.
Measure the resistance between terminal P1-53 for
the ECM that activated the 08 diagnostic code and
termin
al C of the harness connector for the suspect
TPS.
Expec
ted Result:
The resistance measurement is less than ten Ohms.
Results:
•
OK – T
he resistance measurement is less than
ten Ohms. Connect all of the electrical connectors.
Proceed to Test Step 6.
•
Not OK – The resistance measurement is greater
than ten Ohms. There is a problem with the signal
wir
e.
Repair: The problem could be in the wiring or in a
con
nector. Repair the wiring and/or the connector,
when possible . Replace parts, if necessary. Verify
that the problem is resolved.
STOP.
Te
st Step 6. Check the Frequency of the
T
hrottle Position Signal at t he Sensor
A. Connect the electronic service tool to the service
t
ool connector. Refer to electronic troubleshooting
Troubleshooting, “Electronic Service Tools”.
B. Connect a breakout T between the harness
connectors (3 p
in) for the throttle position sensor.
C. Connect a multimeter between terminals B and C
on the breakou
tT.
D. Restore the electrical power to the ECM.
E. Measure the frequency of the throttle position
signal. Slowly move the throttle from low idle to
high idle an
d back to low idle while you measure
the frequency of the signal.
F. Use electro
nic service tool to check for active
diagnostic codes. Slowly move the throttle from
the low idle position to the high idle position. Look
foran08di
agnostic code while you move the
throttle.
Expected R
esult:
The frequency of the signal remains between 150
Hz and 105
0 Hz as you move the throttle. An -08
diagnostic code is not activated.
Results:
•
OK – The frequency of the signal remains between
150 Hz an
d 1050 Hz as you move the throttle. An
08 diagnostic code is not activated.
Repair:
Perform the following procedure:
1. Remove the electrical power from the ECM.
2. Remove the breakout T.
3. Conne
ct the harness connectors for the throttle
position sensor.
4. Resto
re the electrical power to the ECM.
5. Operate the throttle throughout the entire range.
If the problem does not recur, the problem is
resolved. The original problem was probably
caus
ed by a poor electrical connection. Return
the engine to service.
STO
P.
•
Not OK – The frequency of the signal is incorrect.
A91
-08 diagnostic code is activated.
Repair: Perform the following procedure:
1. Remove the electrical power from the ECM.
2. Re
place the throttle position sensor. Check for
an 08 diagnostic code again.
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