5. Troubleshooting
Situation Solution
The wire unit of the temperature
sensor ( NTC ) of the Light Processor
compartment is disconnected from
the P ower Distribution b oard.
Check if the wire unit (reference 16 im age 5-30) of the tempe rature sensor of the Light
Processor compartment is connected w ith the Power Distribution boar d.
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
Defect temperature sensor
(reference 16 image 5-29) which
measures the temp erature inside the
Light P rocessor compartment.
Replace the temperature sensor mounted on the Light Processor assembly (reference
16image 5-29 ).
16
Image 5-30
Code 7639: “Engine air temp high” (Error)
This error c ode is probably preceded by the warning code 7638: “Engine air temp h igh”. T he same troubleshooting table can be
applied to.
Code 7640: “Engine air temp short” (Error)
Situation Solution
Damaged wire unit of the
temperature sensor (reference
16 image 5-29 and image 5-30).
Repair or replace the wire unit.
Defect temperature sensor
(reference 16 image 5-29) which
measures the temp erature inside the
Light P rocessor compartment.
Replace the temperature sensor mounted on the Light Processor assembly (reference
16image 5-29 ).
Code 7641: “Engine air temp open” (Error)
Situation Solution
The wire unit of the temperature
sensor ( NTC ) of the Light Processor
compartment is disconnected from
the P ower Distribution b oard.
Check if the wire unit (reference 16 im age 5-30) of the tempe rature sensor of the Light
Processor compartment is connected w ith the P
ower Distribution board.
Damaged wire unit of the
temperature sensor (reference
16 image 5-29 and image 5-30).
Repair or replace the wire unit.
Defect temperature sensor
(reference 16 image 5-29) which
measures the temp erature inside th
e
Light P rocessor compartment.
Replace the temperature sensor mounted on the Light Processor assembly (reference
16image 5-29 ).
Code 7690: “Rod in temp low” (Error)
This erro r code is probably preceded by the w arning code 7691: “R od in temp low”. T he same troubleshooting table can be applied
to.
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