What 10 items to you monitor. I have had this thing for a while and I am finally going to try to learn how to use it. From what I understand there are 10 items at a time so what are your page setups? Thanks. For those of you that do not know there are the following available:
Standard OBD2 Parameters:
Parameter
Description
Tyical Value
CLSD
Closed-loop status
0 (open loop) when cold
1 (closed loop) after engine warms up
ECT
Engine coolant temperature
185-220 deg F
IAT
Intake air temperature
30-110 deg F or more, depending on the weather
IGN
Ignition advance
Varies: 15-20 degrees at idle, 20-30 at full throttle
LD
Engine load (calculated by the vehicle’s computer)
0-100%, depending on conditions. 2 or 3% or so at idle.
LFT1
LFT2
Long-term fuel trim, driver’s side & passenger side
-10 to +10%
Zero after battery change or vehicle computer reset
MAF
Mass air flow
From 0.5-1 lb/min at idle to 30-35 at full throttle
MAP
Manifold air pressure
9-10”Hg at idle to near 30 at full throttle
MPH
Vehicle speed
Should match speedometer
O2L
O2R
Oxygen sensor, driver’s side
Oxygen sensor, passenger side
Should move around a lot after engine warms up; 850mV to 950mV at full throttle
RPM
Engine speed
600-700 at warm idle, up to 6000 or more during shifts at full throttle
SFT1
SFT2
Short-term fuel trim, driver’s side & passenger side
-10 to +10%
Zero after battery change or vehicle computer reset
Enhanced GM Parameters: (may not apply to all vehicles)
Parameter
Description
Tyical Value
FTC
Fuel trim cell
Varies with engine conditions. In general, numbers go up with load, except for cells 20-22, which may be used for open loop (including full throttle)
IAC
Idle air counts
20-60 at warm idle to 100 while cruising; higher when a/c is on
IDC1
IDC2
Injector duty cycle, driver’s side & passenger side
1-2% at idle, up to 85% at full throttle
IGNV
Ignition volts
12 volts or so with key on, down to 9.5-9.8 during starting, then 13.5-14.5 with engine running
IPW1
IPW2
Injector pulse width
2-4 milliseconds up to 15-20 at higher rpm’s and full throttle
KC
Knock Count
Zero to several dozen
Ideally, should always be zero
KR
Knock retard
Zero to 3-4 degrees
Ideally, should always be zero
MAFF
Mass air flow frequency
2200-2300 at idle, 9000+ at full throttle
MISP
Primary misfiring cylinder
1-8 if misfires present
MISR
Revolutions with misfires
0-10 revs is common; more than that may indicate problem
TPSV
Throttle position sensor voltage
0-5Volts; typically 0.5 volts at idle & 4.5 at full throttle
Thanks a lot,
John
Standard OBD2 Parameters:
Parameter
Description
Tyical Value
CLSD
Closed-loop status
0 (open loop) when cold
1 (closed loop) after engine warms up
ECT
Engine coolant temperature
185-220 deg F
IAT
Intake air temperature
30-110 deg F or more, depending on the weather
IGN
Ignition advance
Varies: 15-20 degrees at idle, 20-30 at full throttle
LD
Engine load (calculated by the vehicle’s computer)
0-100%, depending on conditions. 2 or 3% or so at idle.
LFT1
LFT2
Long-term fuel trim, driver’s side & passenger side
-10 to +10%
Zero after battery change or vehicle computer reset
MAF
Mass air flow
From 0.5-1 lb/min at idle to 30-35 at full throttle
MAP
Manifold air pressure
9-10”Hg at idle to near 30 at full throttle
MPH
Vehicle speed
Should match speedometer
O2L
O2R
Oxygen sensor, driver’s side
Oxygen sensor, passenger side
Should move around a lot after engine warms up; 850mV to 950mV at full throttle
RPM
Engine speed
600-700 at warm idle, up to 6000 or more during shifts at full throttle
SFT1
SFT2
Short-term fuel trim, driver’s side & passenger side
-10 to +10%
Zero after battery change or vehicle computer reset
Enhanced GM Parameters: (may not apply to all vehicles)
Parameter
Description
Tyical Value
FTC
Fuel trim cell
Varies with engine conditions. In general, numbers go up with load, except for cells 20-22, which may be used for open loop (including full throttle)
IAC
Idle air counts
20-60 at warm idle to 100 while cruising; higher when a/c is on
IDC1
IDC2
Injector duty cycle, driver’s side & passenger side
1-2% at idle, up to 85% at full throttle
IGNV
Ignition volts
12 volts or so with key on, down to 9.5-9.8 during starting, then 13.5-14.5 with engine running
IPW1
IPW2
Injector pulse width
2-4 milliseconds up to 15-20 at higher rpm’s and full throttle
KC
Knock Count
Zero to several dozen
Ideally, should always be zero
KR
Knock retard
Zero to 3-4 degrees
Ideally, should always be zero
MAFF
Mass air flow frequency
2200-2300 at idle, 9000+ at full throttle
MISP
Primary misfiring cylinder
1-8 if misfires present
MISR
Revolutions with misfires
0-10 revs is common; more than that may indicate problem
TPSV
Throttle position sensor voltage
0-5Volts; typically 0.5 volts at idle & 4.5 at full throttle
Thanks a lot,
John