Opel Frontera UE. Manual - part 793

6E1–55

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Multiple ECM Information Sensor DTCs Set

 

Step

Action

Value(s)

Yes

No

1

Was the ”On–Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2 

Go to OBD

System

Check 

2

1. Turn the ignition OFF, disconnect the ECM.
2. Turn the ignition ON, check the 5 volt reference

circuits for the following conditions:

D

A poor connection at the ECM.

D

An open between the ECM connector and the
splice.

D

A short to ground.

D

A short to voltage.

Is there an open or short?

—

Go to Step 3 

Go to Step 4 

3

Repair the open or short.

Is the action complete?

—

Verify repair

—

4

Check the sensor ground circuit for the following
conditions:

D

A poor connection at the ECM or the affected
sensors.

D

An open between the ECM connector and the
affected sensors.

Is there an open or a poor connection?

—

Go to Step 5 

Go to Step 6 

5

Repair the open or the poor connection.

Is the action complete?

—

Verify repair

—

6

Measure the voltage between the EGR pintle position
sensor signal circuit at the ECM harness connector and
ground.

Does the voltage measure near the specified value?

0 V

Go to Step 7 

Go to Step 13

7

Measure the voltage between the MAP sensor signal
circuit at the ECM harness connector and ground.

Does the voltage measure near the specified value?

0 V

Go to Step 8 

Go to Step 14

8

Measure the voltage between the TP sensor signal
circuit at the ECM harness connector and ground.

Does the voltage measure near the specified value?

0 V

Go to Step 9 

Go to Step 15

9

Measure the voltage between the IAT sensor signal
circuit at the ECM harness connector and ground.

Does the voltage measure near the specified value?

0 V

Go to Step 10

Go to Step 16

10

Measure the voltage between the ECT sensor signal
circuit at the ECM harness connector and ground.

Does the voltage measure near the specified value?

0 V

Go to Step 20

Go to Step 17

11

Measure the voltage between the A/C Pressure
Sensor circut at the ECM harness connector and
ground.

Does the voltage measure near the specified value?

0 V

Go to Step 13

Go to Step 19

6E1–56

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Multiple ECM Information Sensor DTCs Set

  (Cont'd)

Step

No

Yes

Value(s)

Action

12

1. Disconnect the EGR valve.
2. Measure the voltage between the EGR pintle

position sensor signal circuit at the ECM harness
connector and ground.

Does the voltage measure near the specified value?

0 V

Go to Step 12

Go to Step 17

13

Replace the EGR valve.

Is the action complete?

—

Verify repair

—

14

Locate and repair the short to voltage in the MAP
sensor signal circuit.

Is the action complete?

—

Verify repair

—

15

Locate and repair the short to voltage in the TP sensor
signal circuit.

Is the action complete?

—

Verify repair

—

16

Locate and repair the short to voltage in the IAT sensor
signal circuit.

Is the action complete?

—

Verify repair

—

17

Locate and repair the short to voltage in the ECT
sensor signal circuit.

Is the action complete?

—

Verify repair

—

18

Locate and repair the short to voltage in the A/C
Pressure Sensor circuit.

Is the action complete?

—

Verify repair

—

19

Locate and repair the short to voltage in the EGR pintle
position sensor signal circuit.

Is the action complete?

—

Verify repair

—

20

Replace the ECM.

Is the action complete?

—

Go to OBD

System

Check 

—

6E1–57

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

EXHAUST GAS RECIRCULATION

(EGR) DIAGNOSIS

057RX001

An EGR flow check diagnosis of the linear EGR system is
covered by DTC P0401, P0404, and P0405. If EGR
diagnostic trouble code P0401 is 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 ECM has commanded the A/C
clutch ON. Used in A/C system diagnostics.

A/C REQUEST – Tech 2 Displays YES or NO
Indicates the state of the A/C request input circuit from the
HVAC controls. The ECM 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 ECM 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.

CMP ACT. COUNTER – Cam Position Activity

DECEL FUEL MODE – Tech 2 Displays ACTIVE or
INACTIVE
 ”ACTIVE” displayed indicates that the ECM has detected
conditions appropriate to operate in deceleration fuel
mode. The ECM will command the deceleration fuel
mode when it detects a closed throttle position while the
vehicle is traveling over 20 mph. While in the deceleration
fuel mode, the ECM 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 ECM is
commanding.

DESIRED IDLE – Tech 2 Range 0–3187 RPM
The idle speed that the ECM is commanding. The ECM
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 ECM. The ECM applies 5 volts to the
ECT sensor circuit. The sensor is a thermistor which
changes internal resistance as the temperature changes.
When the sensor is cold (high resistance), the ECM
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 ECM 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
ECM. 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 ECM. A low voltage indicates a
fully extended pintle (closed valve); a voltage near 5 volts
indicates a retracted pintle (open valve).

EGR TEST COUNT – Tech 2 Range 0–255
Indicates the number of EGR flow test samples collected
during the current ignition cycle. Under normal operation,
only one sample is allowed during an ignition cycle. If the
ECM battery feed has been disconnected or a DTC
P0401 has been cleared, 10 EGR flow test samples will
be allowed during the ignition cycle. This is to allow repair
verification during a single ignition cycle.

ENGINE LOAD – Tech 2 Range 0%–100%
Engine load is calculated by the ECM from engine speed
and MAP 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 ECM from the 58X
reference input. It should remain close to desired idle
under various engine loads with engine idling.

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.