Circuit Description

PCM operates a normally open solenoid to control boost. PCM energizes solenoid by providing a ground path which then allows vacuum to pass to wastegate valve. During normal operation, PCM compares wastegate duty cycle signal with boost signal and corrects duty cycle accordingly.

DTC will set when the following conditions are present:

• Engine speed is greater than 2400 RPM.
• Fuel rate is greater than 20 cu. mm.
• Boost pressure is less than, more than or equal to 20 kPa from desired (internal to PCM).
• Conditions are met for 10 seconds.

Or

• Engine speed is greater than 1800 RPM but less than 2400 RPM.
• Fuel rate is greater than 20 cu. mm.
• Boost pressure is less than, more than or equal to 20 kPa from desired (internal to PCM).
• Conditions are met for 10 seconds.