User Guide

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User guide
| CP9680
AutoScanner® Plus
573102 | REV. B | 03.2016
Bosch Automotive Service Solutions Inc.
determines optimum spark timing from sensor informa-
tion — engine speed, throttle position, coolant tempera-
ture, engine load, vehicle speed, Park/Neutral switch
position, and knock sensor condition.
EVAP:
Evaporative emissions system
FC:
Fan control
Freeze frame:
A block of memory containing DTCs of the vehicle oper-
ating conditions for a specific time.
FTP:
Federal test procedure. Strict test of vehicle’s emissions.
Ground (GND):
An electrical conductor used as a common return for an
electric circuit(s) and with a relative zero potential
(voltage).
Hall effect sensor:
Any of a type of sensor utilizing a permanent magnet and
a transistorized Hall Effect switch. Hall Effect type sen-
sors may be used to measure speed and position of the
crankshaft or camshaft — for spark timing and fuel injec-
tor control.
HO2S:
Heated oxygen sensor. See O2S.
HVAC:
Heating, ventilation, & air conditioning (system)
I/M:
Inspection and maintenance. An emission control pro-
gram.
IAC:
Idle air control. A device mounted on the throttle body
which adjusts the amount of air bypassing a closed
throttle so that the PCM can control idle speed.
IAT:
Intake air temperature (sensor)
ICM:
Ignition control module.
IMRC:
Intake manifold runner control
IPC:
Instrument panel cluster
ISC:
Idle speed control. A small electric motor mounted on
the throttle body and controlled by the PCM. The PCM
can control idle speed by commanding the ISC to adjust
its position.
ISO:
International Organization of Standardization also know
as International Standards Organization.
KAM:
Keep alive memory
Knock sensor (KS):
Used to detect engine detonation or knock. The sensor
contains a piezoelectric element and is threaded into the
engine block. Special construction makes the element
sensitive only to engine vibrations associated with deto-
nation.
Knock:
Uncontrolled ignition of the air/fuel mixture in the cylin-
der. Also referred to as detonation or ping. Knock indi-
cates extreme cylinder pressures or “hotspots” that are
causing the air/fuel mixture to detonate prematurely.
KOEO:
Key ON engine OFF. Turn the ignition key to on, but don’t
start the engine.
KOER:
Key ON engine running. Start the vehicle.
LCD:
Liquid crystal display
LTFT:
Long term fuel trim
M/T:
Manual transmission or manual transaxle.
MAF:
Mass air flow (sensor). Measures the amount and den-
sity of air entering the engine and sends a frequency or
voltage signal to the PCM. The PCM uses this signal in
its fuel delivery calculations.
MAP:
Manifold absolute pressure (sensor). Measures intake
manifold vacuum or pressure and sends a frequency or
voltage signal (depending on sensor type) to the PCM.
This gives the PCM information on engine load for con-
trol of fuel delivery, spark advance, and EGR flow.
MAT:
Manifold air temperature (sensor). A resistance sensor
in the intake manifold that sends a voltage signal to the
PCM indicating the temperature of the incoming air. The
PCM uses this signal for fuel delivery calculations.
MIL:
Malfunction indicator lamp. The MIL is most commonly
known as the check engine or service engine soon light.
A required on-board indicator to alert the driver of an
emission-related malfunction.
Misfire:
Caused by the air fuel ratio being incorrect.
Monitor:
A test performed by the on-board computer to verify
proper operation of emission-related systems or compo-
nents.
MPFI or MFI:
Multi-port fuel injection. MPFI is a fuel injection system
using one (or more) injector(s) for each cylinder. The
injectors are mounted in the intake manifold, and fired in
groups rather than individually.
NOx:
Oxides of nitrogen. The system EGR and Camshafts
injects exhaust gases into the intake manifold to reduce
these gases at the tailpipe.
O2S:
Oxygen sensor. Generates a voltage of 0.6 to 1.1 volts
when the exhaust gas is rich (low oxygen content). The