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Conditions for diagnostic trouble code (DTC):
1) Current below normal or open circuit
Diagnostic operating conditions
1) Ignition key in ON position
Observable symptoms
1) The exhaust brake does not function
2) Low Power
Probable cause
1) Open circuit between air valve unit control valve and engine control module (ECM)
2) Open circuit on supply wire to air valve unit
3) Open circuit in air valve unit control valve
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