Throttle Positions
Engine Braking: A condition where the engine is used to slow the vehicle by manually downshifting during a zero throttle coastdown.
Full Throttle Detent Downshift: A quick apply of the accelerator pedal to its full travel, forcing a downshift.
Heavy Throttle: Approximately 3/4 of accelerator pedal travel, 75 percent throttle position.
Light Throttle: Approximately 1/4 of accelerator pedal travel, 25 percent throttle position.
Medium Throttle: Approximately 1/2 of accelerator pedal travel, 50 percent throttle position.
Minimum Throttle: The least amount of throttle opening required for an upshift.
Wide Open Throttle (WOT): Full travel of the accelerator pedal, 100 percent throttle position.
Zero Throttle Coastdown: A full release of the accelerator pedal while the vehicle is in motion and in drive range.
Zero Throttle Brake Applied: Regenative Braking is when the rear wheels are driving the drive motor (w/generator) 2nd position and producing power to be put back in the ESS.
Shift Condition Definitions
Bump: A sudden and forceful apply of a clutch.
Chuggle: A bucking or jerking. It is similar to the feel of towing a trailer.
Delayed: A condition where a shift is expected but does not occur for a period of time. This could be described as a clutch engagement that does not occur as quickly as expected during a part throttle or wide open throttle apply of the
accelerator, or during manual downshifting to a lower range. This term is also defined as LATE or EXTENDED.
Double Bump - Double Feel: Two sudden and forceful applies of a clutch.
Early: A condition where the shift occurs before the vehicle has reached proper speed. This condition tends to labor the engine after the upshift.
End Bump: A firmer feel at the end of a shift than at the start of the shift. This is also defined as END FEEL or SLIP BUMP.
Firm: A noticeably quick apply of a clutch that is considered normal with a medium to heavy throttle. This apply should not be confused with HARSH or ROUGH.
Flare: A quick increase in engine RPM along with a momentary loss of torque. This most generally occurs during a shift. This condition is also defined as SLIPPING.
Harsh - Rough: A more noticeable apply of a clutch than FIRM. This condition is considered undesirable at any throttle position.
Hunting: A repeating quick series of upshifts and downshifts that causes a noticeable change in engine RPM, such as a 4-3-4 shift pattern. This condition is also defined as BUSYNESS.
Initial Feel: A distinctly firmer feel at the start of a shift than at the finish of the shift.
Late: A shift that occurs when the engine RPM is higher than normal for a given amount of throttle.
Shudder: A repeating jerking condition similar to CHUGGLE but more severe and rapid. This condition may be most noticeable during certain ranges of vehicle speed.
Slipping: A noticeable increase in engine RPM without a vehicle speed increase. A slip usually occurs during or after initial clutch apply.
Soft: A slow, almost unnoticeable clutch apply with very little shift feel.
Surge: A repeating engine related condition of acceleration and deceleration that is less intense than CHUGGLE.
Tie-Up: A condition where two opposing clutchs are attempting to apply at the same time causing the engine to labor with a noticeable loss of engine RPM.
Noise Conditions
Drive Link Noise: A whine or growl that increases or fades with vehicle speed, and is most noticeable under a light throttle acceleration. It may also be noticeable in PARK or NEUTRAL operating ranges with the vehicle stationary.
Final Drive Noise: A hum related to vehicle speed which is most noticeable under a light throttle acceleration.
Planetary Gear Noise: A whine related to vehicle speed, which is most noticeable in FIRST gear, SECOND gear, FOURTH gear or REVERSE. The condition may become less noticeable, or go away, after an upshift.
Pump Noise: A high pitched whine that increases in intensity with engine RPM. This condition may also be noticeable in all operating ranges with the vehicle stationary or moving.
Driver Shift Control
Driver shift control (DSC) allows the driver to change gears similar to a manual transmission.
Transmission Abbreviations
A/C: Air Conditioning
AC: Alternating Current
APM: Accessorie DC Power Control Module
AT: Automatic Transmission
DC: Direct Current
DIC: Driver Information Center
DLC: Diagnostic Link Connector
DMM: Digital Multimeter
DSC:: Driver Shift Control
DTC: Diagnostic Trouble Code
ECT: Engine Coolant Temperature
EMI: Electromagnetic Interference
HPCM: Hybrid Powertrain Control Module
IAT: Intake Air Temperature
IGN: Ignition
IMS: Internal Mode Switch or Manual Shift Shaft Position Switch
MAP: Manifold Absolute Pressure
NC: Normally Closed
NO: Normally Open
OBD: On Board Diagnostic
OSS: Output Speed Sensor
PC: Pressure Control
PCM: Powertrain Control Module
PCS: Pressure Control Solenoid
PIM: Drive Motor Generator Power Inverter Control Module
PS: Pressure Switch
PWM: Pulse Width Modulation
RPM: Revolutions Per Minute
SS: Shift Solenoid
TAP: Transmission Adaptive Pressure
TCM: Transmission Control Module
TFP: Transmission Fluid Pressure
TFT: Transmission Fluid Temperature
THECM: Transmission Hydraulic Electronic Control Module
TP: Throttle Position
VSS: Vehicle Speed Sensor
WOT: Wide Open Throttle