(Table 71, contd)
Troubleshooting Test Steps
Values
Results
9. Check the IVS at the Sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the IVS.
C. Set the throttle to low idle.
D. Check the resistance of the IVS.
E. Set the throttle to high idle.
F. Check the resistance of the IVS.
Less than 10 Ohms at
low idle.
Greater than 2000 Ohms
at high idle.
Result:
The IVS indicates the expected
resistance.
No fault is indicated at this time. Recheck the har-
ness for intermittent connections.
Result:
At least one of the resistance measure-
ments is outside of the expected range.
Replace the IVS or replace the throttle sensor.
Refer to OEM documentation for information on
the throttle sensor.
Proceed to Test Step 10.
10. Check the IVS Calibration
A. Connect the electronic service tool to the diagnostic connector.
B. Turn the keyswitch to the ON position.
C. Select the
“
Throttle Configuration
”
option on the electronic
service tool. Select the appropriate
“
Throttle Configuration
”
sum-
mary from the menu on the left of the screen. The IVS window for
the throttle will indicate
“
YES
”
if an IVS is installed. Make a note
of the
“
Idle Validation Min OFF Threshold
”
parameters that are
displayed in the
“
Throttle Configuration
”
menu of the electronic
service tool. Make a note of the
“
Idle Validation Max ON Thresh-
old
”
parameters that are displayed in the
“
Throttle Configuration
”
menu of the electronic service tool.
D. Select the
“
Throttle status
”
function on the electronic service
tool. Select
“
Status
”
function and then select
“
Throttles
”
function.
E. Set the throttle to low idle.
F. Operate the throttle slowly toward high idle. The raw percentage
values for the throttle that are shown on the electronic service tool
should increase and the IVS status should change from CLOSED
(ON) to OPEN (OFF) position. Make a note of the raw reading for
the throttle when the IVS reading changes from the CLOSED posi-
tion to the OPEN position. Repeat this step in order to obtain accu-
rate raw percentage values for the throttle. The noted value should
be within the previously noted
“
Idle Validation Min OFF Threshold
”
and
“
Idle Validation Max ON Threshold
”
limits.
G. The throttle is set to the full throttle position or the high idle
position.
H. Operate the throttle slowly toward low idle. The raw percentage
values for the throttle that are shown on the electronic service tool
should decrease and the IVS status should change from OPEN
(OFF) to CLOSED (ON) position. Make a note of the raw reading
for the throttle when the IVS reading changes from the OPEN posi-
tion to the CLOSED position. Repeat this step in order to obtain
accurate raw percentage values for the throttle. The noted value
should be within the previously noted
“
Idle Validation Min OFF
Threshold
”
and
“
Idle Validation Max ON Threshold
”
limits.
The IVS operates within
the
“
Idle Validation Min
OFF Threshold
”
and the
“
Idle Validation Max ON
Threshold
”
values that
are shown on the
“
Con-
figuration
”
menu of the
electronic service tool.
Result:
The IVS operates within the
“
Idle Valida-
tion Min OFF Threshold
”
and the
“
Idle Validation
Max ON Threshold
”
values that are shown on the
“
Configuration
”
menu of the electronic service
tool.
Return the engine to service.
Result:
The IVS does not operate within the
“
Idle
Validation Min OFF Threshold
”
and the
“
Idle Vali-
dation Max ON Threshold
”
values that are shown
on the
“
Configuration
”
menu of the electronic
service tool.
Proceed to Test Step 11.
Fault cleared
(continued)
UENR0612
143
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