(Table 186, contd)
Troubleshooting Test Steps
Values Results
8. 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”
summary from the menu on the left of the screen. The IVS win-
dow for the throttle will indicate “YES” if an IVS is installed.
Make a note of the “Idle Validation Min OFF Threshold” param-
eters that are displayed in the “Throttle Configuration” menu of
the electronic service tool. Make a note of the “Idle Validation
Max ON Threshold” 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 percent-
age values for the throttle that are shown on the electronic serv-
ice 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 position to the OPEN position. Repeat this step in or-
der to obtain accurate raw percentage values for the throttle.
The noted value should be within the previously noted “Idle Val-
idation 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 percent-
age values for the throttle that are shown on the electronic serv-
ice 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 position 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
thresholds.
Result: The IVS operates within the “Idle Validation Min
OFF Threshold” and the “Idle Validation Max ON
Threshold” values.
The IVS is operating correctly.
Return the engine to service.
Result: The IVS does not operate within the “Idle Vali-
dation Min OFF Threshold” and the “Idle Validation Max
ON Threshold” values.
Proceed to Test Step 9.
9. Use the Electronic Service Tool to Reset the IVS Thresh-
old Limits
The electronic service tool can be used to change the following
parameters to suit the type of throttle that is installed:
· Idle Validation Min OFF Threshold
· Idle Validation Max ON Threshold
Note: The limits are shown in the “Throttle Configuration”
screen which is located in the “Service” menu.
The fault is cleared. Result: The fault is cleared after programming the new
calculated values.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Return the engine to service.
Result: The fault is not cleared.
(continued)
340 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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