Circuit/System Verification
- Verify the integrity of the entire supercharger air induction system by inspecting for the following conditions:
- A restricted or collapsed air intake duct
- A misaligned or damaged air intake duct
- A dirty or deteriorating air filter element
- Any objects blocking the air inlet probe of the MAF/IAT sensor
- Any contamination or debris on the sensing elements in the probe of the MAF/IAT sensor
- Any water intrusion in the induction system
- Any vacuum leak downstream of the MAF/IAT sensor
- An intake manifold leak
- A SCIP sensor vacuum hose that is missing or damaged
- A MAP sensor vacuum hose that is missing or damaged
- A BARO sensor that is skewed or stuck
- A skewed or stuck ECT or IAT sensor-Refer to Temperature Versus Resistance .
- Any type of restriction in the exhaust system-Refer to Restricted Exhaust .
- Inspect the by-pass valve and cable for any of the following conditions:
- Sticking in either the open or closed position
- Binding when opening or closing
- Incorrectly adjusted cable
- Any damage
- If any of the above conditions are found, refer to Supercharger Cleaning and Inspection .
- Ignition ON, observe the MAP and SC Inlet Pressure Sensor kPa parameters with a scan tool. Start the engine and let it idle. The MAP and SC Inlet Pressure Sensor kPa parameters should decrease and closely match each other.
- Ignition ON, depress the accelerator pedal completely and observe the TP Indicated Angle parameter with a scan tool. The TP Indicated Angle parameter should read 98-100 percent.
- If the TP Indicated Angle parameter is not within the specified range, refer to DTC P1516, P2101, P2119, or P2176 .
- With the ignition ON and the engine OFF, perform a snapshot of the throttle actuator control (TAC) data while performing the following action. Refer to Scan Tool Snapshot Procedure
.
- Slowly depress the accelerator pedal to WOT position and then slowly release the pedal. Exit from the snapshot and review the data.
- Compare the TP Sensor 1 and the TP Sensor 2 parameters, frame by frame. The difference between the parameters should be less than 4 percent.
- If the TP Sensor 1 and Sensor 2 parameter difference is more than 4 percent, refer to DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 .
- Engine running, on a road test perform a brief wide open throttle (WOT) acceleration from 30 mph. The MAP sensor parameter on the scan tool should increase rapidly. This increase should be from approximately 35 kPa at idle to greater than 135 kPa.
- If the MAP Sensor parameter does not increase to greater than the specified range, refer to Boost Control System Diagnosis .
CAUTION:
Refer to Road Test Caution
.