Troubleshooting

Table 71
Troubleshooting Test Steps
Values Results
1. Check for Active Diagnostic Codes
A. Establish communication between the electronic service tool
and the ECM. Refer to Troubleshooting, “Electronic Service
Tools”
B. Check for active or logged codes.
Diagnostic Trouble
Codes
Result: There is an active or logged , 558-2 or
2970-2 diagnostic code.
Proceed to Test Step 2.
2. Check the Operation of the IVS
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool in order to check the current
“Throttle Configuration” .
E. Select the “SERVICE” option from the drop-down menu of the
electronic service tool.
F. Select the “Throttle Configuration” option on the electronic serv-
ice tool. Select the appropriate “Throttle Configuration” summary
from the menu on the left of the screen. The IVS window for the
throttle will indicate “YES” if an IVS is installed.
G. Select the “Throttle status” function on the electronic service
tool. Select “Status” function and then select “Throttles” function.
H. The throttle is set in the low idle position.
I. Operate the throttle slowly. The IVS status should change from
CLOSED (ON) to OPEN (OFF).
Switch state Result: The IVS state changes from CLOSED
(ON) to OPEN (OFF).
Proceed to Test Step 3.
Result: The IVS does not operate
Proceed to Test Step 4.
(continued)
142 UENR0612-07
Circuit Tests
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