6-2-34 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
LONG FT B1 (LONG TERM FUEL TRIM, %)
Long term fuel trim value represents long term corrections to the air/fuel mixture computation. A value of 0 indi-
cates no correction, a value greater than 0 means an enrichment correction, and a value less than 0 means an
enrichment correction, and a value less than 0 implies an enleanment correction.
VVT GAP [TARGET-ACTUAL POSITION] (°)
It is calculated using the formula: target valve timing advance – actual valve timing advance.
MAF (MASS AIR FLOW RATE, g/s, lb/min)
It represents total mass of air entering intake manifold which is measured by mass air flow sensor.
CALC LOAD (CALCULATED LOAD VALUE, %)
Engine load displayed as a percentage of maximum possible load. Value is calculated mathematically using the
formula: actual (current) intake air volume
÷
maximum possible intake air volume x 100%
THROTTLE POS (ABSOLUTE THROTTLE POSITION, %)
When throttle position sensor is fully closed position, throttle opening is indicated as 0% and 90 – 100% full
open position.
O2S SENSOR B1 S1 (HEATED OXYGEN SENSOR–1, V)
It indicates output voltage of HO2S–1 installed on exhaust manifold (pre-catalyst).
O2S SENSOR B1 S2 (HEATED OXYGEN SENSOR–2, V)
It indicates output voltage of HO2S–2 installed on exhaust pipe (post-catalyst). It is used to detect catalyst dete-
rioration.
FUEL SYSTEM (FUEL SYSTEM STATUS)
Air/fuel ratio feedback loop status displayed as one of the followings.
OPEN: Open loop-has not yet satisfied conditions to go closed loop.
CLOSED: Closed loop-using oxygen sensor(s) as feedback for fuel control.
OPEN-DRIVE COND: Open loop due to driving conditions (Power enrichment, etc.).
OPEN SYS FAULT: Open loop due to detected system fault.
CLOSED-ONE O2S: Closed loop, but fault with at least one oxygen sensor-may be using single oxygen sensor
for fuel control.
MAP (MANIFOLD ABSOLUTE PRESSURE, mmHg, kPa)
This value indicates how much correction is necessary to keep the air/fuel mixture stoichiometrical.
It is detected by manifold absolute pressure sensor.
BAROMETRIC PRESS (kPa, inHg)
This parameter represents a measurement of barometric air pressure and is used for altitude correction of the
fuel injection quantity and IAC valve control.
STEP EGR FLOW DUTY (%)
This parameter indicates opening rate of EGR valve which controls the amount of EGR flow.
FUEL CUT (ON/OFF)
ON: Fuel being cut (output signal to injector is stopped)
OFF: Fuel not being cut
CLOSED THROTTLE POSITION (ON/OFF)
This parameter will read ON when throttle valve is fully closed, or OFF when the throttle is not fully closed.
CANIST PURGE DUTY (EVAP CANISTER PURGE FLOW DUTY, %)
This parameter indicates valve ON (valve open) time rate within a certain set cycle of EVAP canister purge valve
which controls the amount of EVAP purge.
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