Opel Frontera UBS. Manual - part 2132

 

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Opel Frontera UBS. Manual - part 2132

 

 

6E–101

ENGINE DRIVEABILITY AND EMISSIONS

PCM Diagnostic Trouble Codes

The following table lists the diagnostic trouble codes
supported by this vehicle application. If any DTCs not
listed here are displayed by a Tech 2, the Tech 2 data may
be faulty; notify the Tech 2 manufacturer of any DTCs
displayed that are not included in the following table.
A - Emission related P-code, check engine light on as

soon as a failure detected.

B - Emission related P-code, check engine light on if a

failure detected in two consecutive trips.

C - Non emission related P-code, check engine light on

if a failure detected in one trip.

D - Non emission related P-code, no check engine

light, but P-code will be set if a failure detected.

X - Do not check.

6E–102

ENGINE DRIVEABILITY AND EMISSIONS

PCM Diagnostic Trouble Codes

6E–103

ENGINE DRIVEABILITY AND EMISSIONS

PCM Diagnostic Trouble Codes (Cont’d)

6E–104

ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0101 MAF System Performance

D06RW103

Circuit Description

The mass air flow (MAF) sensor measures the amount of
air which passes through it into the engine during a given
time.  The powertrain control module (PCM) uses the
mass air flow information to monitor engine operating
conditions for fuel delivery calculations.  A large quantity
of air entering the engine indicates an acceleration or high
load situation, while a small quantity or air indicates
deceleration or idle.
The MAF sensor produces a frequency signal which can
be monitored using a Tech 2.  DTC P0101 will be set if the
signal from the MAF sensor does not match a predicted
value based on throttle position and engine RPM.

Conditions for Setting the DTC

D

The engine is running.

D

No TP sensor or MAP sensor DTCs are set.

D

The throttle is steady, TP angle doesn’t change by
more than 1%.

D

System voltage is between 11.5 volts and 16 volts.

D

Calculated air flow is between 25 g/second and 40
g/second.

D

Above conditions present for at least 1 second.

D

MAF signal frequency indicates an airflow significantly
higher or lower than a predicted value based on throttle
position and engine RPM for a total of 12.5 seconds
over a 25-second period of time.

Action Taken When the DTC Sets

D

The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.

D

The PCM calculates an airflow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.

D

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.

Conditions for Clearing the MIL/DTC

D

DTC P0101 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Diagnostic Aids

An intermittent may be caused by the following:

D

Poor  connections.

D

Mis-routed harness.

D

Rubbed through wire insulation.

D

Broken wire inside the insulation.

Refer to Intermittents under service category Symptoms.
Any un-metered air may cause this DTC to set.  Check for
the following:

D

The duct work at the MAF sensor for leaks.

D

An engine vacuum leak.

D

The PCV system for vacuum leaks.

D

An incorrect PCV valve.

 

 

 

 

 

 

 

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