Isuzu 1999 RODEO Workshop Manual page 698

MAP – Tech 2 Range 10–105 kPa (0.00–4.97 Volts)
The manifold absolute pressure (MAP) sensor measures
the change in the intake manifold pressure from engine
load, EGR flow, and speed changes. As intake manifold
pressure increases, intake vacuum decreases, resulting
in a higher MAP sensor voltage and kPa reading. The
MAP sensor signal is used to monitor intake manifold
pressure changes during the EGR flow test, to update the
BARO reading, and as an enabling factor for several of
the diagnostics.
MIL – Tech 2 Displays ON or OFF
Indicates the PCM commanded state of the malfunction
indicator lamp ("Check Engine Lamp").
MISFIRE CUR. CYL. #1/#2/#3/#4 – Tech 2 Range
0–255 Counts
The misfire current counters increase at a rate according
to the number of possible misfires being detected on each
cylinder. The counters may normally display some
activity, but the activity should be nearly equal for all the
cylinders.
MISFIRE CUR. CYL. #1/#2/#3/#4 – Tech 2 Range
0–65535 Counts
The misfire history counters display the relative level of
misfire that has been detected on each cylinder. The
misfire history counters will not update or show any
activity until a misfire DTC (P0300) has become active.
MISFIRE FAILURES SINCE FIRST FAIL – Tech 2
Range 0–65535 Counts
Indicates the number of 200 crankshaft revolution sample
periods during which the level of misfire was sufficiently
high to report a fail.
MISFIRE PASSES SINCE FIRST FAIL – Tech 2
Range 0–65535 Counts
Indicates the number of 200 crankshaft revolution sample
periods during which the level of misfire was sufficiently
low to report a pass.
POWER ENRICHMENT – Tech 2 Displays ACTIVE
or INACTIVE
"ACTIVE" displayed indicates that the PCM has detected
conditions appropriate to operate in power enrichment
mode. The PCM will command power enrichment mode
when a large increase in throttle position and load is
detected. While in the power enrichment mode, the PCM
will increase the amount of fuel delivered by entering
"Open Loop" and increasing the injector pulse width. This
is done to prevent a possible sag or hesitation from
occurring during acceleration.
RICH/LEAN BANK 1 – Tech 2 Displays RICH or
LEAN
Indicates whether oxygen sensor voltage is above a 600
mV threshold voltage ("RICH") or below a 3000 mV
threshold voltage ("LEAN"). Should change constantly
while in "Closed Loop", indicating that the PCM is
controlling the air/fuel mixture properly.
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
SHORT TERM FT BANK 1
Short term fuel trim to a bank represents a short term
correction to the bank fuel delivery by the PCM in
response to the amount of time the bank fuel control
oxygen sensor voltage spends above or below the 450
mV threshold. If the oxygen sensor voltage has mainly
remained less than 450 mV, indicating a lean air/fuel
mixture, short term fuel trim will increase into the positive
range above 0% and the PCM will pass fuel. If the oxygen
sensor voltage stays mainly above the threshold, short
term fuel trim will decrease below 0% into the negative
range while the PCM reduces fuel delivery to compensate
for the indicated rich condition. Under certain conditions
such as extended idle and high ambient temperatures,
canister purge may cause short term fuel trim to read in
the negative range during normal operation. Fuel trim
values at maximum authority may indicate an excessively
rich or lean system.
SPARK – Tech 2 Range –64° to 64°
Displays the amount of spark advance being commanded
by the PCM on the IC circuit.
START–UP ECT – Tech 2 Range –40°C to 151°C
(–40°F to 304°F)
Indicates the engine coolant temperature at the time that
the vehicle was started. Used by the HO2S diagnostic to
determine if the last start–up was a cold start.
START–UP ECT – Tech 2 Range –40°C to 151°C
(–40°F to 304°F)
Indicates the intake air temperature at the time that the
vehicle was started. Used by the HO2S diagnostic to
determine if the last start–up was a cold start.
TOTAL MISFIRE CURRENT COUNT – Tech 2 Range
0–255
Indicates the total number of cylinder firing events that
were detected as being misfires during the last 200
crankshaft revolution sample period.
TP ANGLE – Tech 2 Range 0%–100%
TP (throttle position) angle is computed by the PCM from
the TP sensor voltage. TP angle should display "0%" at
idle and "100%" at wide open throttle.
TP SENSOR – Tech 2 Range 0.00–5.00 Volts
The voltage being monitored by the PCM on the TP
sensor signal circuit.
UPSHIFT LAMP (MANUAL TRANSMISSION)
VEHICLE SPEED – Tech 2 Range 0–255 km/h
(0–155 mph)
The vehicle speed sensor signal is converted into km/h
and mph for display.
WEAK CYLINDER – Tech 2 Displays Cylinder
Number
This indicates that the PCM has detected crankshaft
speed variations that indicate 2% or more cylinder firing
events are misfires.
6E1–71