6E1–58
X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
FUEL PUMP – Tech 2 Displays ON or OFF
Indicates the ECM commanded state of the fuel pump
relay driver circuit.
FUEL TRIM CELL – Tech 2 Range 0–21
The fuel trim cell is dependent upon engine speed and
MAF sensor readings. A plot of RPM vs. MAF is divided
into 22 cells. Fuel trim cell indicates which cell is currently
active.
FUEL TRIM LEARN – Tech 2 Displays NO or YES
When conditions are appropriate for enabling long term
fuel trim corrections, fuel trim learn will display YES. This
indicates that the long term fuel trim is responding to the
short term fuel trim. If the fuel trim learn displays NO, then
long term fuel trim will not respond to changes in short
term fuel trim.
HO2S BANK 1, SEN. 1 – Tech 2 Range 0–1000 mV
Represents the fuel control exhaust oxygen sensor
output voltage. Should fluctuate constantly within a range
between 10 mV (lean exhaust) and 1000 mV (rich
exhaust) while operating in ”Closed Loop”.
HO2S BANK 1, SEN. 1 – Tech 2 Displays NOT
READY or READY
Indicates the status of the exhaust oxygen sensor. The
Tech 2 will indicate that the exhaust oxygen sensor is
ready when the ECM detects a fluctuating HO2S voltage
sufficient to allow ”Closed Loop” operation. This will not
occur unless the exhaust sensor is warmed up.
HO2S WARM UP TIME BANK 1, SEN. 1 – Tech 2
Range 00:00:00–99:99:99 HRS:MIN:SEC
Indicates warm–up time for each HO2S. The HO2S
warm–up time is used for the HO2S heater test. The ECM
will run the heater test only after a cold start (determined
by engine coolant and intake air temperature at the time
of start–up) and only once during an ignition cycle. When
the engine is started the ECM will monitor the HO2S
voltage. When the HO2S voltage indicates a sufficiently
active sensor, the ECM looks at how much time has
elapsed since start–up. If the ECM determines that too
much time was required for the HO2S to become active,
a DTC will set. If the engine was warm when started,
HO2S warm–up will display ”00:00:00.”
IAC POSITION – Tech 2 Range 0–255 Counts
Displays the commanded position of the idle air control
pintle in counts. A larger number of counts means that
more air is being commanded through the idle air
passage. Idle air control should respond fairly quickly to
changes in engine load to maintain desired idle RPM.
IAT (INTAKE AIR TEMPERATURE) – Tech 2 Range
–40
°
C to 151
°
C (–40
°
F to 304
°
F)
The ECM converts the resistance of the intake air
temperature sensor to degrees. Intake air temperature
(IAT) is used by the ECM to adjust fuel delivery and spark
timing according to incoming air density.
IGNITION 1 – Tech 2 Range 0–25.5 Volts
This represents the system voltage measured by the
ECM at its ignition feed.
INJ. PULSE BANK 1 – Tech 2 Range 0–1000 msec.
Indicates the amount of time the ECM is commanding
each injector ON during each engine cycle. A longer
injector pulse width will cause more fuel to be delivered.
Injector pulse width should increase with increased
engine load.
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 ECM commanded state of the malfunction
indicator lamp (”Check Engine Lamp”).
POWER ENRICHMENT – Tech 2 Displays ACTIVE
or INACTIVE
”ACTIVE” displayed indicates that the ECM has detected
conditions appropriate to operate in power enrichment
mode. The ECM will command power enrichment mode
when a large increase in throttle position and load is
detected. While in the power enrichment mode, the ECM
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.
SPARK – Tech 2 Range –64
°
to 64
°
Displays the amount of spark advance being commanded
by the ECM 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.
TP ANGLE – Tech 2 Range 0%–100%
TP (throttle position) angle is computed by the ECM 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 ECM on the TP
sensor signal circuit.
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 ECM has detected crankshaft
speed variations that indicate 2% or more cylinder firing
events are misfires.