Scan Tool Data Definitions Part 2
part 2SPARK: Scan Tool Range -64°. to 64°: Displays the spark timing being commanded by the PCM on the IC circuit. A negative (-) value indicates degrees Before Top Dead Center (BTDC) or spark advance; a positive value indicates degrees After Top Dead Center (ATDC) or spark retard. Because the ignition control module sets spark advance at a fixed value of 10 BTDC while operating in Bypass mode, the displayed Spark advance only reflects true spark timing when the PCM has commanded IC mode.
START-UP ECT: Scan Tool Range -40°C to 151°C (-40°F to 304°F. Indicates the Engine Coolant Temperature at the time that the vehicle was started. Used by the HO2S diagnostic to determine if the last startup was a cold start.
START-UP IAT: Scan Tool Range -40°C to 151°C (-40°F to 304°F. Indicates the Intake Air Temperature at the time that the vehicle was started. Used by the HO2S diagnostic to determine if the last startup was a cold start.
SUPERCHARGER BOOST: Scan Tool Range 0% to 100%.
Represents the amount of manifold boost pressure commanded by the PCM. 100% displayed indicates full boost commanded.
THROTTLE AT IDLE: Scan Tool Displays YES or NO. Indicates whether the TP Angle being monitored by the PCM is at 0% when the throttle is closed. Refer to DTC P0121 if TP sensor angle is not 0% with the throttle closed. P0121
TOTAL MISFIRE CURRENT COUNT:Scan Tool Range 0 to 99.
Indicates the total number of cylinder firing events that were detected as being misfires during the last 200 crankshaft revolution sample period.
TOTAL MISFIRE FAILURES SINCE FIRST FAIL: Scan Tool Range 0 to 65535 Counts.
Indicates the number of 200 crankshaft revolution sample periods during which the level of misfire was sufficiently high to report a failure.
TOTAL MISFIRE PASSES SINCE FIRST FAIL: Scan Tool Range 0 to 65535 Counts.
Indicates the number of 200 crankshaft revolution sample periods during which the level of misfire was sufficiently low to report a pass.
TP ANGLE: Scan Tool Range 0% to 100%. TP Angle is computed by the PCM from the TP Sensor voltage. TP Angle should display 0% at idle and 100% at wide open throttle.
TP SENSOR: Scan Tool Range 0.00 to 5.00 Volts. The voltage being monitored by the PCM on the TP sensor signal circuit.
TRACTION CONTROL: Scan Tool Displays ACTIVE or INACTIVE.
ACTIVE displayed indicates that the traction control system is taking action to reduce drive wheel slippage.
TRACTION CONTROL DESIRED TORQUE: Scan Tool Range 0% to 100%.
Represents the PWM signal from the Electronic Brake and Traction Control Module. The EBTCM reduces the Traction Control Desired Torque signal pulse width when a drive wheel slippage situation is detected. The PCM monitors the Traction Control Desired Torque signal and reduces drive wheel slippage as necessary by retarding spark timing, decreasing boost sol. PWM, or increasing air/fuel ratio. The PCM can also turn OFF up to three fuel injectors if the Traction Control Desired Torque signal indicates a large enough amount of drive wheel slippage. A problem with the Traction Control Desired Torque signal should cause DTC P1571 to set.
TRACTION CONTROL TORQUE: Scan Tool Range 0% to 100%.
Represents the PWM signal which indicates the percent of available torque the engine is delivering to the drive wheels. The EBTCM monitors the Traction Control Torque signal to ensure that the PCM is responding properly to the Traction Control Desired Torque signal.
TRANSMISSION RANGE: Scan Tool Displays INVALID,PARK / NEUTRAL, REVERSE, DRIVE 4, DRIVE 3, DRIVE 2, or LOW. Transmission Range represents the decoded status of the four inputs from the Transaxle Range Switch Assembly. The combination of transaxle range inputs indicates the position of the transaxle manual valve.
TR SWITCH P / A / B / C: Scan Tool Displays HIGH or LOW.
The TR Switch P / A / B / C display represents the states of the four inputs from the transaxle range switch. HIGH displayed indicates a B+ voltage signal being monitored at the PCM, LOW displayed indicates a grounded input signal. The combination of transaxle range inputs indicates the position of the transaxle manual valve.
TRANS. HOT MODE: Scan Tool Displays ACTIVE or INACTIVE.
ACTIVE displayed indicates that the PCM has detected conditions appropriate for Transaxle hot mode operation. The PCM determines this base on Transaxle fluid temperature. While in Hot Mode, Transaxle shift points may be altered, 4th gear disabled, and the TCC forced ON in 2nd gear.
TWC DIAGNOSTIC: Scan Tool Displays ENABLED or DISABLED.
ENABLED displayed indicates that MAF, HO2S, ECT, or VSS DTCs that would disable the TWO diagnostic are not present.
TWC MONITOR TEST COUNTER: Scan Tool Range 0-49. The TWC monitor test counter increments while the TWO system diagnostic test is running and taking samples. When the TWO Monitor Test Counter reaches 49, the PCM will update the TWC diagnostic statistical filter. At this point, the TWO Monitor Test Counter will reset to 0 and begin incrementing again. The TWO Monitor Test Counter is most useful when verifying a Three-way catalytic converter replacement or any repair associated with the DTC P0420 diagnostic table.
TWC PROTECTION: Scan Tool Displays ACTIVE or INACTIVE.
ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in TWO Protection mode. This is determined based on Engine Load and Engine Coolant Temperature. While in TWO Protection, the PCM will decrease Air/Fuel Ratio to a value that depends on Mass Air Flow (higher Mass Airflow = lower Air/Fuel Ratio).
VEHICLE SPEED: Scan Tool Range 0-255 km/h, 0-155 mph.
The vehicle speed sensor signal is converted into mph and km/h for display.
VTD FUEL DISABLE: Scan Tool Displays ACTIVE or INACTIVE.
The Theft Deterrent Fuel Enable circuit is an input from the Vehicle Theft Deterrent Control Module that signals the PCM to enable the injectors if the proper signal is received. The scan tool will normally display INACTIVE. If the Vehicle Theft Deterrent Control Module does not sent the correct Theft Deterrent Fuel Enable signal to the PCM, the display will switch to ACTIVE and the fuel system may be disabled. Refer to DTCs P1626, P1629, or Vehicle Theft Deterrent diagnosis for further information.