Part 1

Scan Tool Data Definitions

The Engine Scan Tool data Definitions contains a brief description of all engine related parameters available on the scan tool. The list is in alphabetical order. A given parameter may appear in any one of the data lists. In some cases the parameter may appear more than once or in more than one data list in order to group certain related parameters together.
A/C Status:
- The scan tool displays On or Off. The scan tool will display On when voltage is applied to the A/C compressor clutch.

Actual EGR Position
- The scan tool range is 0-100 percent. The actual EGR position indicates the actual EGR position in a percentage.

APP Average
- The scan tool displays 0 to 125 counts. The TAC module takes the voltages from the 3 APP sensors, averages them, and converts them into steps. This average is displayed on the scan tool. The average will be different on every vehicle.

APP Indicated Angle
- The scan tool displays 0-100 percent. The scan tool will display accelerator pedal position in percentage. When the APP is at rest, display will show 0 percent. when the APP is fully depressed, display will show 100 percent.

APP Sensor 1 and APP Sensor 2 Disagree
- The scan tool displays Yes or No. When the TAC module receives a signal voltage from APP sensor 1 not in proper relationship to APP sensor 2, the scan tool will display Yes. The scan tool will display No under normal operating conditions.

APP Sensor 1 and APP Sensor 3 Disagree
- The scan tool displays Yes or No. When the TAC module receives a signal voltage from APP sensor 1 not in proper relationship to APP sensor 3, the scan tool will display Yes. The scan tool will display No under normal operating conditions.

APP Sensor 2 and APP Sensor 3 Disagree
- The scan tool displays Yes or No. When the TAC module receives a signal voltage from APP sensor 2 not in proper relationship to APP sensor 3, the scan tool will display Yes. The scan tool will display No under normal operating conditions.

APP Sensor 1 Out of Range
- The scan tool displays Yes or No. If the APP sensor voltage is not within specifications, the scan tool will display Yes. If the APP sensor voltage is within specifications, the scan tool will display No.

APP Sensor 2 Out of Range
- The scan tool displays Yes or No. If the APP Sensor voltage is not within specifications, the scan tool will display Yes. If the APP sensor voltage is within specifications, the scan tool will display No.

APP Sensor 3 Out of Range
- The scan tool displays Yes or No. If the APP Sensor voltage is not within specifications, the scan tool will display Yes. If the APP Sensor voltage is within specifications, the scan tool will display No.

APP Sensor 1
- The scan tool displays 0-5.0 volts. When the accelerator pedal is at 0 percent (pedal at rest), display will show less than 1 volt. When the accelerator pedal is at 100 percent (pedal fully depressed), display will show more than 3.3 volts.

APP Sensor 2
- The scan tool displays 5.0-0 volts. When the accelerator pedal is at 0 percent (pedal at rest), display will show more than 4 volts. When accelerator pedal is at 100 percent (pedal fully depressed), display will show less than 1 volt.

APP Sensor 3
- The scan tool displays 5.0-0 volts. When the accelerator pedal is at 0 percent (pedal at rest), display will show more than 3.5 volts. When the accelerator pedal is at 100 percent (pedal fully depressed), display will show less than 2.6 volts.

APP Sensor 1 Angle
- The scan tool displays 0-100 percent. When the accelerator pedal is at rest, display will show 0 percent. When the accelerator pedal is fully depressed, display will show 100 percent. This percentage indicates actual pedal position to the TAC module.

APP Sensor 2 Angle
- The scan tool displays 0-100 percent. When the accelerator pedal is at rest, display will show 0 percent. When the accelerator pedal is fully depressed, display will show 100 percent. This percentage indicates actual pedal position to the TAC module.

APP Sensor 3 Angle
- The scan tool displays 0-100 percent. When the accelerator pedal is at rest, display will show 0 percent. When the accelerator pedal is fully depressed, display will show 100 percent. This percentage indicates actual pedal position to the TAC module.

BARO
- The scan tool range is 10-105 kPa. The barometric pressure reading is determined from the MAP sensor signal monitored during key up and wide open throttle (WOT) conditions. The barometric pressure is used to compensate for altitude differences.

BARO
- The scan tool range is 0.00-5.0 volts. The barometric pressure reading is determined from the MAP sensor signal monitored during key up and wide open throttle (WOT) conditions. The barometric pressure is used to compensate for altitude differences.

CAM Signal Input-Low to High
- The scan tool displays 0-65535 counts. The counts increment as the PCM detects the camshaft sensor signal voltage going from low to high.

CAM Signal Input-High to Low
- The scan tool displays 0-65535 counts. The counts increment as the PCM detects the camshaft sensor signal voltage going from high to low.

CC Brake Switch
- The scan tool displays Applied or Released. This parameter indicates the state of the CC brake switch circuit input. An open switch indicates 0.0 voltage input (brake switch open, brake pedal applied). A closed switch indicates a B+ voltage input (brake switch closed, brake pedal released). When the vehicle brakes are applied, the scan tool display will show Applied. The torque converter clutch and cruise control will disengage. When the vehicle brakes are released, the scan tool will display Released. This will allow cruise control to be resumed and the torque converter clutch to engage.

Clutch Switch
- The scan tool displays Depressed or Released. When the vehicle clutch pedal is depressed the scan tool display shows Depressed and the cruise control will disengage. When the vehicle clutch pedal is released the scan tool display shows Released, and the cruise control can be resumed.

Commanded EGR
- The scan tool range is 0-100 percent. The scan tool display represents the PCM commanded PWM duty cycle of the exhaust gas recirculation (EGR) valve. 0 percent displayed indicates no EGR, 100 percent displayed indicates full EGR.

Cruise Switch
- The scan tool displays On or Off. When the cruise control switch is activated, the scan tool displays On. The switch, when in the ON position, sends a signal voltage to the throttle actuator control (TAC) module. This allows all other functions of the cruise control. When the cruise control switch is turned OFF, the scan tool will display Off.

Cruise Requested
- The scan tool displays Yes or No. When the cruise control switch is in the ON position and the Set/Coast switch is activated the scan tool will display Yes. When the cruise control switch is in the ON position and the Set/Coast switch is released the scan tool will display No.

Cruise Resume/Accel
- The scan tool displays On or Off. When the cruise control switch is in the ON position and the Resume/Accel switch is activated, the scan tool will display On. When the Resume/Accel switch is released the scan tool will display Off.

Cruise Set/Coast
- The scan tool displays On or Off. When the cruise control switch is in the ON position and the Set/Coast switch is activated, the scan tool will display On. When the Set/Coast switch is released the scan tool will display Off.

Cruise Disengage History 1-8
- The scan tool will display the last 8 cruise control disengages in order from 1 to 8. There are 20 possible causes for the cruise control to disengage. Refer to Cruise Control Diagnosis Cruise Control Diagnosis.

Desired Idle Speed
- The scan tool range is 0-3187 RPM. The desired idle is the idle speed that is commanded by the PCM. The PCM will compensate for various engine loads based on engine coolant temperature to keep the engine at the desired speed.

Desired EGR Position
- The scan tool range is 0-199.9 percent. The desired EGR position indicates the desired EGR position in a percentage.

DTC Set This Ignition
- The scan tool displays Yes or No. This parameter indicates whether or not a diagnostic trouble code has been set on the current ignition cycle.

ECT
- The scan tool range is -39°C-140°C (-38°F-284°F). The engine coolant temperature (ECT) sensor is mounted in the cylinder head of the left bank. The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal will decrease and the PCM will interpret the lower voltage as a warm engine.

EGR Feedback
- The scan tool range is 0.00-5.0 volts. The display indicates the EGR pintle position sensor signal voltage being monitored by the PCM. A low voltage indicates a fully extended pintle (closed valve). A voltage near 5 volts indicates a fully retracted pintle (open valve).

EGR Closed Pintle Position
- The scan tool range is 0.00-5.0 volts. The display represents the learned voltage that the PCM uses to determine whether or not the EGR valve is fully closed (0 percent pintle position). If the EGR PWM is 0 percent and a difference of more than 0.4 volt between EGR feedback and EGR closed valve pintle position is detected, a DTC will set.

Engine Oil Pressure
- The scan tool displays 0-144 psi (992 kPa). The scan tool displays engine oil pressure.

Engine Oil Life Remaining
- The scan tool displays 0-100 percent. The scan tool displays the percent of oil life remaining. The PCM calculates the Engine Oil Life by monitoring engine load, engine temperature, and engine speed, etc.

EOP Sensor
- The scan tool displays 0-5.0 volts. The scan tool displays engine oil pressure in volts.

Engine Run Time
- The scan tool displays Hours, Minutes, and Seconds. This indicates the amount of time the engine has been operating. When the ignition is cycled OFF, the timer will be set to zero.