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C7 ZR1 LT5 Supercharger Electronic Bypass Valve

Posted By: teamzr1

C7 ZR1 LT5 Supercharger Electronic Bypass Valve - 08/26/18 04:42 PM

The supercharger on the 2019 Corvette ZR1 creates a maximum boost pressure of 13.96 psi (96.3 kPa) to help the 6.2L small block V8 engine (RPO LT5) deliver 755 horsepower and 715 lb.-ft. of torque.

The supercharger is designed to increase the air pressure and density in the intake manifold.
When the air is mixed with the correct amount of fuel, the result is more power from the engine.
The supercharger is a positive displacement pump that is directly driven from the engine drive belt system, so boost pressure is available in all driving conditions.

The electronic compressor re-circulation valve, or supercharger bypass valve actuator (Fig. 28, #1) on the LT5, is very similar to a standard electronic throttle body used for diesel engines.
It provides fully-variable boost pressure control with none of the restrictions known to pneumatically-controlled re circulation valves.

During moderate to heavy acceleration the bypass valve is commanded near closed.
As the desired throttle position increases, the throttle valve is commanded wide open and the Electronic Control Module (ECM) modulates the supercharger bypass valve position to control boost pressure.
When boost is not desired, such as at idle and partial throttle cruising, or on deceleration, the excess air that the supercharger produces is recirculated through the open supercharger bypass valve and the passage between the intake manifold and the supercharger inlet.

Bypass Valve Codes

DTCs related to the bypass valve include:

P0034 Supercharger Bypass Solenoid Valve Control Circuit Low Voltage
P0035 Supercharger Bypass Solenoid Valve Control Circuit High Voltage
P0039 Supercharger Bypass Valve Position Performance
P10EE Supercharger Bypass Valve Control Circuit Shorted
P23AA Supercharger Bypass Valve Stuck Closed
P2BBC Supercharger Bypass Valve Position Sensor Circuit Low Voltage
P2BBD Supercharger Bypass Valve Position Sensor Circuit High Voltage
P2BBE Supercharger Bypass Valve Position Sensor Exceeded Learning Limit
P2BBF Supercharger Bypass Valve Supply Circuit Low Voltage
P2BC0 Supercharger Bypass Valve Driver High Current
U0657 Lost Communication with Supercharger Bypass Valve Position Sensor

Bypass Valve Connector

The supercharger bypass valve connector is located on the front of the engine just above the throttle body.
The bypass valve connector should not be confused with the nearby fuel rail connector, which is located under the intake manifold cover. (Fig. 29)

The connectors are interchangeable. (Fig. 30)
Be sure to locate the correct connector when performing any repairs.

Attached picture F28-bypass-throttle-body.jpg

Description: Figure 28
Attached picture F29-2-conn-LT5-with-callouts.jpg

Description: Figure 29
Attached picture F30-2-conn-LT5-circled.jpg
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