Opel Frontera UE. Manual - part 321

6E2–90

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Manifold Absolute Pressure (MAP) Output Check

D06RX135

Circuit Description

The manifold absolute pressure (MAP) sensor measures
the changes in the intake MAP which result from engine
load (intake manifold vacuum) and engine speed
changes; and converts these into a voltage output.  The
powertrain control module (PCM) sends a 5-volt
reference voltage to the MAP sensor.  As the MAP
changes, the output voltage of the sensor also changes.
By monitoring the the sensor output voltage, the PCM
knows the MAP.  A lower pressure (low voltage) output
voltage will be about 1-2 volts at idle.  Higher pressure
(high voltage) output voltage will be about 4-4.8 volts at
wide open throttle.  The MAP sensor is also used, under
certain conditions, to measure barometric pressure,
allowing the PCM to make adjustments for different
altitudes.  The PCM uses the MAP sensor to diagnose
proper operation of the EGR system, in addition to other
functions.

Test Description

IMPORTANT:

Be sure to used the same diagnostic test

equipment for all measurements.
The number(s) below refer to the step number(s) on the
Diagnostic Chart.
1.  Applying 34 kPa (10 Hg) vacuum to the MAP sensor

should cause the voltage to be 1.5-2.1 volts less
than the voltage at step 1.  Upon applying vacuum
to the sensor, the change in voltage should be
instantaneous.  A slow voltage change indicates a
faulty sensor.

IMPORTANT:

Make sure the electrical connector

remains securely fastened.

2.  Disconnect the sensor from the bracket.  Twist the

sensor with your hand to check for an intermittent
connection.  Output changes greater than 0.10 volt
indicate a bad sensor.

6E2–91

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Manifold Absolute Pressure (MAP) Output Check

 

Step

Action

Value(s)

Yes

No

1

1. Turn the ignition “OFF” and leave it “OFF” for 15

seconds.

2. Ignition “ON.”  Don’t crank engine.
3. The Tech 2 should indicate a manifold absolute

pressure (MAP) sensor voltage.

4. Compare this scan reading to scan reading of a

known good vehicle obtained using the exact same
procedure as in Steps 1–4.

Is the voltage reading the same +/–0.40 volt?

—

Go to 

Step 2

Go to 

Step 5

2

1. Disconnect the MAP sensor and plug inletmanifold.
2. Connect a hand vacuum pump to the MAP sensor.
3. Start the engine.
4. Apply 34 kPa (10 Hg) of vacuum and note the

voltage change.

Is the voltage change 1.5-2.1 volts less than step 1?

—

Go to 

Step 3

Go to 

Step 4

3

Check the sensor cover for leakage or restriction.

Does the cover supply vacuum to the MAP sensor
only?

—

Go to 

Step 5

Go to 

Step 4

4

Repair the material to block.

Is the action complete?

—

Verify repair

—

5

Check the sensor connection.

Is the sensor connection good?

—

Go to 

Step 5

Go to 

Step 6

6

Refer to 

On-Vehicle Service, MAP Sensor.

Is the action complete?

—

Verify repair

—

7

Repair the poor connection.

Is the action complete?

—

Verify repair

—

6E2–92

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Evaporative (EVAP) Emissions Canister Purge Valve Check

D06RX016

Circuit Description

The evaporative emissions canister purge is controlled by
a solenoid that allows manifold and/or vacuum to purge
the canister when it is energized.  The powertrain control
module (PCM) supplies a ground to energize the solenoid
valve (purge “ON”).  The EVAP purge solenoid control is
turned “ON” and “OFF” several times a second.  The duty
cycle (pulse width or “ON” time) is determined by engine
operating conditions including load, throttle position,
coolant temperature and ambient temperature.  The duty
cycle is calculated by the PCM and the purge solenoid is
enabled when the appropriate conditions have been met:

D

The engine run time after start is more than 60
seconds.

D

The engine coolant temperature is above 30

°

C

(86

°

F).

D

The fuel control system is operating in the closed-loop
mode.

Diagnostic Aids

D

Make a visual check of vacuum hoses.

D

Check the throttle body for possible cracked.

D

Check the malfunction indicator lamp for a possible
mechanical problem.

Test Description

The number(s) below refer to the step number(s) on the
Diagnostic Chart.
1. Check to see if the solenoid is open or closed.  The

solenoid is normally de-energized in this step, so it
should be closed.

2. This step checks to determine if the solenoid was

open due to an electrical circuit problem or a
defective solenoid.

3. This should normally energize the solenoid, opening

the valve and allowing the vacuum to drop (purge
“ON”).

6E2–93

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Evaporative (EVAP) Emissions Canister Purge Valve Check

 

Step

Action

Value(s)

Yes

No

1

1. Ignition “OFF.”
2. Ignition “ON,” engine “OFF.”
3. At the throttle body, disconnect the hose that goes

to the pump solenoid.

4. Using a hand vacuum pump with an attached

vacuum gauge 5-8840-0279-0, apply vacuum (10”
Hg or 34 kPa) to the solenoid.

Does the solenoid hold the vacuum?

—

Go to 

Step 3

Go to 

Step 2

2

1. Disconnect the solenoid electrical connector.
2. As in Step 1, apply vacuum (10” Hg or 34 kPa) to the

solenoid.

Does the solenoid hold the vacuum?

—

Go to 

Step 4

Go to 

Step 7

3

1. At the throttle body, put a cap over the vacuum port

where the hose was disconnected for testing.  This
is to prevent a vacuum leak when the engine is
started.

2. Ignition “OFF.”
3. Install the Tech 2.
4. Apply vacuum to the purge solenoid with the hand

vacuum pump.

5. Start the engine, run at 2500 RPM.
6. Using the Tech 2, select F0: Engine, F3: Misc.

Tests, F0: EVAP Purge.

7. Turn the purge solenoid “ON.”

Did the vacuum drop when the purge was turned on?

—

Go to 

Step 8

Go to 

Step 9

4

Check for a short to ground in the RED/BLU wire.

Is there a short?

—

Go to 

Step 5

Go to 

Step 6

5

Repair the short to ground.

Is the action complete?

—

Verify repair

—

6

Replace the PCM.

Is the action complete?

—

Verify repair

—

7

Replace the faulty purge solenoid.  Refer to 

On-Vehicle

Service, EVAP Canister Purge Solenoid.

Is the action complete?

—

Verify repair

—

8

1. Turn the ignition “OFF.”
2. At the throttle body, install a vacuum gauge where

the hose from the purge solenoid was disconnected
for testing.

3. Start the engine.
4. Stabilize the engine speed at about 2500 RPM.
5. Momentarily snap the throttle open and let it return

to idle.

Is there approximately 10” Hg (34 kPa) of vacuum
available at the EVAP emission canister purge
solenoid?

—

No problem

found in the

EVAP

emission

canister

purge valve

check

Refer to

Diagnostic

Aids