User Manual

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User guide
| CP9670
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573904 | REV. B | 03.2016
Bosch Automotive Service Solutions Inc.
Programmable read-only memory. The PROM contains
programming information the PCM needs to operate a
specific vehicle model/engine combination.
PSPS:
Power steering pressure switch
Purge solenoid:
Controls the flow of fuel vapors from the carbon canister
to the intake manifold. The canister collects vapors
evaporating from the fuel tank, preventing them from
escaping to the atmosphere and causing pollution.
During warm engine cruise conditions, the PCM ener-
gizes the Purge Solenoid so the trapped vapors are
drawn into the engine and burned.
PWM:
Pulse width modulated
PZM:
Platform zone module
QDM:
Quad driver module
RAM:
Random access memory
Relay:
An electromechanical device in which connections in
one circuit are switched.
Reluctance sensor:
A type of sensor typically used to measure crankshaft or
camshaft speed and/or position, driveshaft speed, and
wheel speed.
ROM:
Read-only memory. Permanent programming information
stored inside the PCM, containing the information the
PCM needs to operate a specific vehicle model/engine
combination.
RPM:
Revolutions per minute
SAE:
Society of Automotive Engineers
Scan tool:
A device that interfaces with and communicates informa-
tion on a data link.
SDM:
Sensing and diagnostic module
Sensor x:
A standard term used to identify the location of oxygen
sensors. Sensor 1 is located upstream of the catalytic
converter. See O2S, Bank 1, Bank 2.
Sensor:
Any device that reports information to the PCM. The job
of the sensor is to convert a parameter such as engine
temperature into an electrical signal that the PCM can
understand.
SFI or SEFI:
Sequential fuel injection or sequential electronic fuel
Injection. A fuel injection system that uses one or more
injectors for each cylinder. The injectors are mounted in
the intake manifold and are fired individually.
Solenoid:
A device consisting of an electrical coil which when
energized, produces a magnetic field in a plunger, which
is pulled to a central position. A solenoid may be used as
an actuator in a valve or switch.
STFT:
Short term fuel trim
STS:
Service throttle soon
TAC:
Throttle actuator control
TBI:
Throttle body injection. A fuel injection system having
one or more injectors mounted in a centrally located
throttle body, as opposed to positioning the injectors
close to an intake valve port. TBI is also called Central
Fuel Injection (CFI) in some vehicles.
TCC:
Torque converter clutch
TCM:
Transmission control module
TCS:
Traction control system for PCM and brakes
TDC:
Top dead center. When a piston is at its uppermost
position in the cylinder.
TFP:
Transmission fluid pressure
TFT:
Transmission fluid temperature (sensor)
Throttle body:
A device which performs the same function as a carbure-
tor in a fuel injection system. On a throttle body injec-
tion (TBI) system, the throttle body is both the air door
and the location of the fuel injectors. On port fuel injec-
tion systems (PFI, MPFI, SFI, etc.), the throttle body is
simply an air door. Fuel is not added until the injectors
at each intake port are activated. In each case, the
throttle body is attached to the accelerator pedal.
TPS:
Throttle position sensor. Potentiometer-type sensor
connected to the throttle shaft. Its voltage signal output
increases as the throttle is opened. The PCM uses this
signal to control many systems such as idle speed, spark
advance, fuel delivery, etc.
Traction assist:
Assist in traction with brakes only.
Trip:
Vehicle operation for a period of time so the systems can
be monitored.
TTS:
Transmission temperature sensor. A resistance sensor
mounted in the transmission housing in contact with the
transmission fluid. It sends a voltage signal to the PCM
indicating the temperature of the transmission.
VECI:
Vehicle emission control information. A decal located in
the engine compartment containing information about