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This symptom is usually associated with the Upper switch mounted on the Front Access Door Support and with
the right switch mounted in the ITU Light Shield.
Step
Action and questions
1
Make sure that the ITU light shield is not broken.
Is the ITU light shield broken?
2
Make sure that the ITU light shield is not out of position.
Is the ITU light shield out of position?
3
Make sure the ITU assembly interlock switch actuator
is not damaged or broken and actuates the switches
correctly.
Is the actuator damaged or broken?
4
Front cover assembly
Does the front cover close correctly?
5
Front cover assembly
Make sure the front cover flag is not broken or
damaged and actuates the switches correctly.
Is the flag broken or damaged?
6
HVPS/cover open interlock cable assembly to engine
board—make sure that the cable is correctly connected
to J86 on the engine board.
Is the cable connected correctly?
7
HVPS/cover open interlock cable assembly—make
sure the front cover is closed and the ITU is correctly
installed. Disconnect the switch cable from J86 on the
engine board. Check for continuity between J86-1 and
J86-2 on the cable connector.
Is there continuity?
Yes
No
Replace the ITU
Go to step 2
light shield
Properly align ITU
Go to step 3
light shield
Replace the ITU
Go to step 4
assembly. See
"ITU assembly
removal" on
page 4-37
Go to step 5
Install the front
cover correctly or
repair as
necessary
Replace the front
Go to step 6
cover. See
"Front
cover assembly
removal" on
page 4-10
Go to step 7
Install the cable
correctly
Replace the engine
Replace the HVPS/
board. See
cover open
"Engine board
interlock switch/
removal" on
cable assembly
page 4-29
Diagnostic information
5060-00x
2-119
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