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P-302: Boost Pressure Sensor Calibration
The 3176 Boost Pressure Sensor must be calibrated for a zero boost condition with the engine OFF. Calibration is accomplished electronically without need for manual adjustments.The sensor must be recalibrated whenever the transducer module or ECM has been replaced. Incorrect sensor calibration may result in poor engine response or a Diagnostic Code 25 (Boost Pressure Sensor Fault) or a Diagnostic Code 42 (Check Sensor Calibration).Calibration Procedure:
1. Start engine and warm up to normal operating temperature, then turn key OFF.2. Turn key ON (engine off). The sensor will not calibrate if the engine is running.3. Select the Boost Sensor Calibration screen on the ECAP or DDT (see the Special Instructions included with the ECAP or DDT).4. Wait several seconds for the automatic calibration to occur. The screen will display "Calibrated" when finished.5. If the boost pressure sensor will not calibrate, follow P-225: Boost Pressure Sensor Test.P-303: Throttle Position Sensor Adjustment
The Throttle Position Sensor (TPS) is used to provide a throttle signal to the Electronic Control Module (ECM).Sensor output is a constant frequency signal whose pulse width varies with throttle position. This output signal is referred to as either "Duty Cycle" or a "Pulse Width Modulated (PWM)" signal and is expressed as a percentage. When correctly adjusted, the "Remote Mounted" TPS will produce a "Duty Cycle" signal of 15% to 20% at the low idle throttle position and 80% to 85% at the maximum throttle position. The "Pedal Mounted" TPS will produce a "Duty Cycle" of 10% to 22% at the low idle throttle position and 75% to 90% at the high idle throttle position. This signal is translated by the ECM into a "THROTTLE POSITION" signal of 3% at low idle and 100% at full throttle. Always use "DUTY CYCLE" for sensor adjustment.The Throttle Position Sensor may be one of two types. The "Remote-Mounted" TPS is about the size of a soft drink can and is connected to the throttle pedal by OEM-supplied linkage. It requires adjustment for correct operation (explained in this procedure). The "Pedal-Mounted" TPS is mounted directly to a specific style of throttle pedal and requires no adjustment, and in fact can not be adjusted (this procedure NOT needed). Both sensors provide the same type of signal to the ECM. Step 1. Inspect Throttle LinkageInspect the throttle linkage for loose, bent, broken, missing, or worn components. Also check for interference with the linkage or spring. The throttle linkage should work smoothly without excessive drag and return to a low idle position without assistance in less than 1 second. Repair linkage if needed.Step 2. Adjust At Low Idle PositionA. With key OFF-* Install the 40-Pin Breakout 'T' on the Vehicle Connector (J7/P7).* Connect Pulse Width Modulation Probe (from ECAP/DDT) to the Throttle Signal (Pin 40) of the Breakout 'T'. New Service Program Modules (SPM) allow the "Throttle Duty Cycle" to be read directly from the ECM without using the Pulse Width Modulation Probe. With the new SPM installed on the ECAP,