Opel Frontera UE. Manual - part 918

 

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Opel Frontera UE. Manual - part 918

 

 

6E2–58

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Exhaust Gas Recirculation (EGR)

Diagnosis

Pintle position error diagnosis is covered by DTC P0402,
P0404, P1404, P0405, P0406. If EGR diagnostic trouble
codes P0402, P0404, P1404, P0405, P0406 are
encountered, refer to the DTC charts.

Engine Tech 2 Data Definitions and

Ranges

A/C CLUTCH–Tech 2 Displays ON or OFF–
Indicates whether the PCM has commanded the A/C
clutch ON.  Used in A/C system diagnostic.

A/C REQUEST — Tech 2 Displays YES or NO —
Indicates the state of the A/C request input circuit from the
HVAC controls.  The PCM uses the A/C request signal to
determine whether A/C compressor operation is being
requested.

AIR/FUEL RATIO — Tech 2 Range 0.0-25.5 —
Air/fuel ratio indicates the PCM commanded value.  In
closed loop, the air/fuel ratio should normally be
displayed around “14.2–14.7.”  A lower air/fuel ratio
indicates a richer commanded mixture, which may be
seen during power enrichment or TWC protection modes.
A higher air/fuel ratio indicates a leaner commanded
mixture.  This can be seen during deceleration fuel mode.

BARO kPa — Tech 2 Range 10-105 kPa/0.00-5.00
Volts —
The barometric pressure reading is determined from the
MAP sensor signal monitored during key up and wide
open throttle (WOT) conditions.  The barometric pressure
is used to compensate for altitude differences and is
normally displayed around “61-104” depending on
altitude and barometric pressure.

CHECK TRANS LAMP–AUTO TRANSMISSION–
Indicates the need to check for a DTC with the Tech 2
when the lamp is flashing 0.2 seconds ON and 0.2
seconds OFF.

CMP ACT. COUNTER –Cam Position
ActivityDECEL FUEL MODE—Tech 2 Display
ACTIVE or INACTVE—
“ACTIVE” displayed indicates that the PCM has detected
conditions appropriate to operate in deceleration fuel
mode.  The PCM will command the deceleration fuel
mode when it detects a closed throttle position while the
vehicle is traveling over 20 mph.  While in the decreasing
fuel mode, the PCM will decrease the amount of fuel
delivered by entering open loop and decreasing the
injector pulse width.

DESIRED EGR POS.—Tech 2 Range 0%-100%—
Represents the EGR pintle position that the PCM is
commanding.

DESIRED IDLE — Tech 2 Range 0-3187 RPM —
The idle speed that the PCM is commanding.  The PCM
will compensate for various engine loads based on engine
coolant temperature,  to keep the engine at the desired
speed.

ECT — (Engine Coolant Temperature) Tech 2
Range –40

°

C to 151

°

C (–40

°

F to 304

°

F) —

The engine coolant temperature (ECT) is mounted in the
coolant stream and sends engine temperature
information to the PCM.  The PCM applies 5 volts to the
ECT sensor circuit.  The sensor is a thermistor which
changes internal resistance as temperature changes.
When the sensor is cold (high resistance), the PCM
monitors a high signal voltage and interprets that as a cold
engine.  As the sensor warms (decreasing resistance),
the voltage signal will decrease and the PCM will interpret
the lower voltage as a warm engine.

EGR DUTY CYCLE — Tech 2 Range 0%-100% —
Represents the EGR valve driver PWM signal from the
PCM.  A duty cycle of 0% indicates that no EGR flow is
being commanded; a 100% duty cycle indicates
maximum EGR flow commanded.

EGR FEEDBACK — Tech 2 Range 0.00-5.00 Volts —
Indicates the EGR pintle position sensor signal voltage
being monitored by the PCM.  A low voltage indicates a
fully extended pintle (closed valve); a voltage near 5 volts
indicates a retracted pintle (open valve).

ENGINE LOAD — Tech 2 Range 0%-100% —
Engine load is calculated by the PCM from engine speed
and MAF sensor readings.  Engine load should increase
with an increase in RPM or air flow.

ENGINE RUN TIME — Tech 2 Range
00:00:00-99:99:99 Hrs:Min:Sec —
Indicates the time elapsed since the engine was started.
If the engine is stopped, engine run time will be reset to
00:00:00.

ENGINE SPEED — Range 0-9999 RPM —
Engine speed is computed by the PCM from the 58X
reference input.  It should remain close to desired idle
under various engine loads with engine idling.

EVAP PURGE PWM —  Tech 2 Range 0%-100% —
Represents the PCM commanded PWM duty cycle of the
EVAP purge solenoid valve.  “0%” displayed indicates no
purge; “100%” displayed indicates full purge.

EVAP VENT VALVE–  Tech 2 Displays PURGE or
NO PURGE–
The EVAP purge vacuum valve is a normally closed valve
positioned in the purge line between the canister and the
EVAP purge solenoid.  The EVAP purge vacuum valve
will open when vacuum increases to greater than 5 inches
of water in the purge line.  The EVAP purge vacuum valve
is used by the PCM to monitor EVAP canister purge
solenoid opetation and purge system integrity.  The EVAP
purge vacuum valve should be closed to ground with no
vacuum present (0% EVAP purge PWM).  With EVAP
purge PWM at 25% or greater, the EVAP purge vacuum
valve should be open and “PURGE” should be indicated.

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.

6E2–59

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

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 0-1132 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 BANK2, SEN. 1—Tech 2 Range 0–1132 mV—
Represents the fuel control exhaust oxygen sensor
output voltage.  Should fluctuate constantly within a range
between 10mV (lean exhaust) and 1000 mV (rich
exhaust) while operating in closed loop.

HO2S BANK 1, SEN. 1–Tech 2 Displays READY
YES/NO–
Indicates the status of the exhaust oxygen sensor.  The
Tech 2 will indicate that the exhaust oxygen sensor is
ready when the PCM detects a fluctuating HO2S voltage
sufficient to allow closed loop operation.  This will not
occur unless the exhaust oxygen sensor is warmed up.

HO2S BANK 2, SEN. 1–Tech 2 Displays READY
YES/NO–
Indicates the status of the exhaust oxygen sensor.  The
Tech 2 will indicate that the exhaust oxygen sensor is
ready when the PCM detects a fluctuating HO2S voltage
sufficient to allow closed loop operation.  This will not
occur unless the exhaust oxygen sensor is warmed up.

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 PCM converts the resistance of the intake air
temperature sensor to degrees.  Intake air temperature
(IAT) is used by the PCM 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
PCM at its ignition feed.

INJ. PULSE BANK 1/INJ. PULSE BANK 2– Tech 2
Range 0-1000 msec. –
Indicates the amount of time the PCM 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.

KS NOISE CHANNEL (Knock Sensor)–
Indicates the output from the KS noise channel.  There is
always some electrical noise in an engine compartment
and to avoid mistaking this as engine knock, the output
from the knock sensor is compared to the output from the
noise channel.  A knock condition is not set unless the
knock sensor output is greater than the noise channel
output.

LONG TERM FUEL TRIM BANK 1/BANK 2 –
The long term fuel trim is derived from the short term fuel
trim values and represents a long term correction of fuel
delivery for the bank in question.  A value of 0% indicates
that fuel delivery requires no compensation to maintain
the PCM commanded air/fuel ratio.  A negative value
significantly below 0% indicates that the fuel system is
rich and fuel delivery is being reduced (decreased injector
pulse width).  A positive value significantly greater than
0% indicates that a lean condition exists and the PCM is
compensating by adding fuel (increased injector pulse
width).  Because long term fuel trim tends to follow short
term fuel trim, a value in the negative range due to
canister purge at idle should not be considered unusual.
Fuel trim values at maximum authority may indicate an
excessively rich or lean system.

LOOP STATUS — Tech 2 Displays OPEN or
CLOSED —
“CLOSED” indicates that the PCM is controlling fuel
delivery according to oxygen sensor voltage.  In “OPEN”
the PCM ignores the oxygen sensor voltage and bases
the amount of fuel to be delivered on TP sensor, engine
coolant, and MAF sensor inputs only.

MAF — Tech 2 Range 0.0-512 gm/s —
MAF (mass air flow) is the MAF input frequency
converted to grams of air per second. This indicates the
amount of air entering the engine.

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.

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 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.

6E2–60

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

RICH/LEAN BANK 1/ BANK 2 — 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.

SHORT TERM FT BANK1/BANK2–
Short term fuel trim to a bank represents a short term
correction to 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 IAT — 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 — 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.

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.

Typical Scan Data Values

Use the Typical Scan Data Values Table only after the
On-Board Diagnostic System Check has been
completed, no DTC(s) were noted, and you have
determined that the on-board diagnostics are functioning
properly.  Tech 2 values from a properly-running engine
may be used for comparison with the engine you are

diagnosing.  The typical scan data values represent
values that would be seen on a normally-running engine.

NOTE: A Tech 2 that displays faulty data should not be
used, and the problem should be reported to the Tech 2
manufacturer.  Use of a faulty Tech 2 can result in
misdiagnosis and unnecessary replacement of parts.

Only the parameters listed below are referred to in this
service manual for use in diagnosis.  For further
information on using the Tech 2 to diagnose the PCM and
related sensors, refer to the applicable reference section
listed below.  If all values are within the typical range
described below, refer to the 

Symptoms section for

diagnosis.

Test Conditions

Engine running, lower radiator hose hot, transmission in
park or neutral, closed loop, accessaries off, brake not
applied and air conditioning off.

6E2–61

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

3.2L V-6 Engine

Tech 2 Parameter

Data List

Units

Displayed

Typical Data Values

(IDLE)

Typical Data Values

(2500 RPM)

Engine Speed

Engine

RPM

Within –50 to +100 of

“Desired Idle”

Actul engine speed

Desired Idle Speed

Engine

RPM

750

800

Engine Coolant Temperature

Engine

°

C or 

°

F

80 – 100 (176 – 212

°

F)

80 – 100 (176 – 212

°

F)

Start Up ECT (Engine Coolant
Temperature)

Engine

°

C or 

°

F

Intake Air Temperature

Engine

°

C or 

°

F

0 – 100, depends on

underhood

0 – 80, depends on

underhood

Start Up IAT (Intake Air Temperature)

Engine

°

C or 

°

F

Manifold Absolute Pressure

Engine

kPa

23 – 40

19 – 32

Manifold Absolute Pressure

Engine

V

0.65 – 1.32

0.46 – 1.10

Barometric Pressure

Engine

kPa

61 – 104 (depends pn

altitude and

barometric)

61 – 104 (depends pn

altitude and

barometric)

Throttle Position

Engine

%

0

3 – 5

Throttle Position Sensor

Engine

V

0.35 – 0.39

0.55 – 0.59

Mass Air Flow

Engine

g/s

2.85 – 6.65

9.5 – 16.5

Air Fuel Ratio

Engine

Ratio:_to1

14.7:1

14.7:1

Injection Pulse Bank 1

Engine

ms

2.0 – 4.0

2.5 – 4.0

Injection Pulse Bank 2

Engine

ms

2.0 – 4.0

2.5 – 4.0

Spark Advance

Engine

°

CA

15 – 22

34 – 44

EGR Duty Cycle

Engine

%

0

0

Desired EGR Position

Engine

%

0

0

EGR Normalized

Engine

%

0

0

EGR Feedback

Engine

V

0.45 – 0.80

0.45 – 0.80

EGR Closed Pintle Position

Engine

Steps

20 – 40

20 – 40

Catalyst Protection Mode

Engine

Yes/No

No

No

Knock Sensor Noise Channel

Engine

V

0.10 – 0.40

0.50 – 1.75

A/C Clutch Relay

Engine

On/Off

Off

A/C Request

Engine

Yes/No

No

Camshaft Activity

Engine

Counts

0 – 255 always

increasing

0 – 255 always

increasing

EVAP Purge Solenoid (Evaporative
Emission)

Engine

On/Off

Off

Off

Fuel Pump

Engine

On/Off

On

On

Idle Air Control

Engine

Steps

Transmission Check Light

Engine

On/Off

Off

Off

Park/Neutral Position

Engine

P-N/R-D-

3-2-L

P-N

P-N

TCC Engaged

Engine

Yes/No

No

No

Vehicle Speed

Engine

MPH or

km/h

0

0

Ignition Voltage

Engine

V

12.8 – 14.1

12.8 – 14.1

 

 

 

 

 

 

 

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