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Code 57, Flow Chart, Boost Control Problem, (VIN 1)

NOTE: Prior To Performing This Chart, Verify Presence Of At Least 15 In. Hg. Vacuum To By-Pass Actuator Solenoid With Engine Idling. Also Verify Lines Are Not Plugged. Repair Any Vacuum Supply Problems.
Fig 1: Code 57, Flow Chart, Boost Control Problem, (VIN 1)
GB0049141