ECU
Factory Tech 1 full scan tool output (Suzuki OBD1)
1995 PUB. list: ( I merged the 8v and 16v values in
to one
table , all lists 89-95 combined. OBD1)
Values are for a hot engine idling and not moving , 0 mph.
Items in blue are 8 valve and 16 Valve
differences.
Items in Red are very critical items for
troubleshooting driveablity or
MPG issues.
FUNCTION
|
UNITS
|
TYP.VALUE and RANGE
|
| ENGINE SPEED |
RPM |
800
±50 0-9999
|
| DESIRED
IDLE R |
RPM
|
ECM cont.
varies 0-2000
|
| ENG. COOL TEMP |
°C/F
|
176-194°F
typ. -40 to250°F |
8V Intake Air Temp
|
°C/F |
149-167°F
typ same
|
16V
MAS AIR FLOW MAF.
|
g/S
|
3.1g/S
|
| THROTTLE
POSITION |
volts
|
.85 to
.95Volts [idle] (0
to 5.1vdc WOT)
|
| TROTTLE ANGLE |
° |
0° at
idle
up to 90° max. (wot= 80 typ)
|
8V MAP Manifold Air Pressure
|
kPa,V |
39 kPa /
1.56v
0-125kPa range, 0-950 mmHG
|
8V BARO
|
kPa,V
|
98 kPa /
4.00v same range above, use only for altiude
|
HO2S (OXY)
|
mV
|
10-900 mV typ
varies. 0-2500mV
|
| O2
ACTIVATION |
true/false
|
active
or not. "Closed loop op's"
|
| S.T
FUEL TRIM |
na
|
127
typ counts 0 to 255 ( 128 is center pt)
|
L.T
FUEL TRIM
|
na
|
118
typ
counts 0 to 255 (128 is center pt)
|
| SPARK ADVANCE |
° |
5°-15°
up to 60° |
INJ. PULSE
WIDTH
|
mSEC
|
1.1-1.6
mSEC 0
to 65mS
|
| IAC/ ISC AIR FLOW |
L/MIN
|
24-40
L/MIN ,(
0 t0 250 max.)
|
IAC/ ISC
ADJUST
MONITOR
|
%
|
0% typ and up
to
100%
|
IDLE SWITCH
(TPS)
|
on/off
|
on
|
8v THROTTLE OPEN SOLENOID
|
on/off
|
off
|
FUEL PUMP
|
on/off
|
on
|
EGR GAS TEMP
(CALIF)
|
°C/°F |
140 TO
145°F
(32 to 470°F ,max)
|
EGR SOLENOID
|
on/off
|
off
|
A/C SWITCH
|
on/off
|
off
|
POWER STEERING
SWITCH
|
on/off
|
off
|
PARK/NEUTRAL
POS
|
P-n or R-DL
|
P-n =Auto,
R-DL manual
|
MPH/KM/HR
|
MPH/km/hr
|
0/0
-parked (0 to 125mph max)
|
FUEL EVAP PURGE
|
%
|
0% (100%
max) 8v shows on or off.
|
RICH LEAN
STATUS
|
rich/lean
|
switches
will show
lean if HO2S is low all the time. (or opposite)
|
SYSTEM VOLTAGE
|
volts
|
14-14.5 volts
(20v
max) 0 to 18.75vdc range
|
16 VCHARGING EFFi
|
%
|
10%
(100% max)
|
8V time from start
|
sec
|
0-510 sec and
rolls
|
Notes:
Fuel trim is the amount of fuel the ECU adds or subtracts, to achieve
STOICH 14.7:1 Air to fuel ratio (by weight);
The
short term is like a lawn sprinkler , where is the water going? ,
Answer: all over the place. (fast corrections are happening)
As you drive the STFT slowly (seconds) transfers to the LTFT which
zero's the STFT, so that
temporary changes are stored in the short term. And long term
changes in LTFT.
The Long term is like the water meter showing flow (the equation
, algebraic math is, STFT +
LTFT = Total fuel trim.)
Best
practice, is to ignore STFT ,unless it sticks . ( it moves way
faster than you can see it, and for sure faster then any scan tool, can
see
it (refresh rates))
The above LTFT of 118 shows ECU is
removing about -10 % fuel ( OBD2 uses percent) Very
Normal !
The remainder of the above is chicken soup, to any modern OBD2 user.
This example data chart represents, what is displayed by the GM Tech1
scan
tool.
refr: 6E3-A-14 and 6E2-A-10 FSM GEO 1995 pub.
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