(Table 71, contd)
Troubleshooting Test Steps
Values
Results
3. Check the IVS Threshold
A. Connect the electronic service tool to the diagnostic connector.
B. Turn the keyswitch to the ON position.
C. Use the electronic service tool in order to check the current
“
Throttle Configuration
”
.
D. Select the
“
SERVICE
”
option from the drop-down menu of the
electronic service tool.
E. 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.
F. To select the
“
Throttle status
”
function on the electronic service
tool, select
“
Status
”
function and then select
“
Throttles
”
function.
G. The throttle is set in the low idle position.
H. Operate the throttle slowly. The IVS status should change from
CLOSED (ON) to OPEN (OFF).
Switch operation
Result:
The IVS switch operates within the
“
Idle
Validation Min OFF Threshold
”
and the
“
Idle Vali-
dation Max ON Threshold
”
parameters.
The fault appears to be resolved.
Return the engine to service.
Result:
The IVS switch cannot operate within the
“
Idle Validation Min OFF Threshold
”
and the
“
Idle
Validation Max ON Threshold
”
parameters
Proceed to Test Step 10.
4. Inspect Electrical Connectors and Wiring
A. Inspect the P1/J1 ECM connector.
B. Inspect the connectors for the throttle position sensors.
C. Perform a 30 N (6.7 lb) pull test on each of the wires in the
ECM connector and the connector for the throttle position sensors.
D. Check all of the wiring associated with the throttle position sen-
sors for abrasions and pinch points.
Damaged wire or
connector
Result:
A damaged wire or damaged connector
was not found.
Proceed to Test Step 5.
Result:
A damaged wire or damaged connector
was found.
Repair the damaged wire or the damaged
connector.
Use the electronic service tool to clear all logged
diagnostic codes. Verify that the repair eliminates
the fault.
5. Check the Voltage at the IVS Switch
A. Disconnect the IVS harness connector.
B. Turn the keyswitch to the ON position.
C. Use a suitable multimeter to measure the voltage between the
IVS terminal on the harness connector and a suitable ground.
D. Turn the keyswitch to the OFF position.
7.9 V to 12.2 V
Result:
The voltage is within the expected range.
Proceed to Test Step 6.
Result:
The voltage is not within the expected
range.
Proceed to Test Step 7.
(continued)
UENR0612
141
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