Results of Incorrect Operation

The following conditions will result in reduced engine power, especially during a wide open throttle (WOT) operation:

• An open boost control solenoid control circuit.
• An open control solenoid ignition 1 voltage circuit.
• An open control solenoid control circuit.
• A boost control solenoid valve that is stuck open.

The following conditions will result in full boost to be commanded at all times. These conditions can also result in overboost conditions during high engine load situations.

• A boost control solenoid control circuit shorted to ground.
• A boost control solenoid valve is stuck closed.
• A restriction in the boost source or signal vacuum hoses.
• A restriction in the exhaust system may cause an overboost condition and reduced fuel economy.

A restriction in the vacuum signal hose to the bypass valve actuator or stuck closed bypass valve will cause a noisy idle and reduced fuel economy.