PID Definitions
A – 2 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
A
CAT TEMPxy (- 40 – 6513.5ºC) or ( - 40
– 9999.9ºF)
Catalyst Temperature displays the cata-
lyst substrate temperature for a Bank x
catalyst (if used by control module strat-
egy for OBD monitoring) or displays the
Bank x Sensor y catalyst temperature
sensor.
CLR DST (0 – 65,535 km) or (0 – 40,722
miles)
Distance Since Cleared Diagnostic
Codes is the distance driven since diag-
nostic trouble codes were erased.
CLR TIM (0 – 65,535 min) or (0 – 1092.25
hours)
Time Since Cleared Diagnostic Code is
time since diagnostic trouble codes were
erased.
CMD EQ RATxy (0 – 1.99)
Commanded Equivalence Ratio is the
ratio of the air/fuel mixture.
• For systems that use conventional
oxygen sensors, the commanded
equivalence ratio displays in open
loop. In closed loop, the value is 1.0.
• Fuel systems using wide-range/lin-
ear oxygen sensors display com-
manded equivalence ratio in both
open and closed loop operation.
COOLANT (- 40 – 215ºC) or (- 40 –
419ºF)
Coolant displays engine coolant temper-
ature (ECT) from a ECT sensor or cylinder
head temperature sensor.
✓Many diesel engines do not
use either sensor and may
substitute Engine Oil Temper-
ature instead.
EGR CMD (0 – 100%)
Commanded Exhaust Gas Recirculation
is the normalized percentage of exhaust
gas being recirculated.
EGR ERR (-100 – 99.22%)
Exhaust Gas Recirculation Error shows
the error from changing from one condi-
tion to another.
ENG RUN (0 – 65,535 sec.)
Time since Engine Start is the time the
engine is running.
✓ENG RUN stops when engine
stalls or engine is turned off
for any reason.
ENGINE (0 – 16,383.75 RPM)
Engine is the speed engine is running in
revolutions per minute (RPM).
EQ RATxy
O2 Sensor Equivalence Ratio is used for
linear or wide-ratio oxygen sensors for
Bank x Sensor y.
EVAP REQ (0 – 100%)
Commanded Evaporative Purge is the
position evaporative purge control valve
is open in percentage.
EVAP VP (- 8192 – 8191 PA) or (-
32.8878 – 32.8838 H20)
Evaporative E missions System Vapor
Pressure is pressure in the fuel tank
FUEL LVL (0 – 100%)
Fuel Level Input is the percentage of fuel
with 0% equaling tank is full and 100%
when tank is empty.
FUEL PRES (0 – 765 kPa) or (0 - 110 psi)
Fuel Rail Pressure is the fuel pressure at
the engine when reading in reference to
atmosphere pressure.
FUEL SYS (OPEN or CLSD)
Fuel System Status show loop status of
fuel system banks.
OPEN: Module is operating in
Open Loop control strate-
gy. The vehicle has not yet
satisfied conditions for
Module to go to closed
loop.
CLSD: PCM currently functioning
in Closed loop control strat-
egy, using O2 sensor(s) as
feedback for fuel control
OPEN1: Open Loop control strategy
is being used by the PCM
due to driving conditions.
Driving conditions that may
cause this to happen are
power enrichment and de-
celeration enrichment.
OPEN2: The PCM is operating in
Open Loop control strategy
due to detected system
fault. Certain actuator or
sensor faults will cause
module to use an open loop
strategy.
CLSD1: Closed Loop control is cur-