expensive part to change in trial & error
test the lambda
2.8.3 Block 030 – Lambda Control Operating Status
Note! Before continuing:
• Adjust the engine RPM to 2000 using the handy tool, or your steady leg
Enter the Basic Settings block 030.
In block 030, the fields 1 and 2 are three-digit binary codes that give the status of
the oxygen sensors. The first digit indicates the probe heating status, the second
digit indicates the probe condition, and the third digit indicates lambda control
status. The value should fluctuate between 111 (heater on) and 011 (heater off).
The last two digits can also fluctuate between 1 and 0, but should be
predominantly 11.
Do not continue with testing until the displays have reached 111 in field 1 and
110 in field 2, at least once.
2.8.4 Block 034 - Ageing of Pre-Cat Oxygen Sensor
Enter the Basic Settings block 034.
Field 2 shows the Exhaus Gas Temperature, measured by the oxygen sensor. It
must be above 350°C for the test to succeed.
The value in field 3 is called “dynamic factor”. It is an indicator for lambda probe
ageing. The value should be above 0.5; the value for a new sensor is ~2.0. It will
decrease as the sensor ages.
The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
either 'B1-S1 OK' or 'B1-S1 NOT OK' afterwards. It may take several minutes to
obtain result of diagnosis.
Do not continue with testing unless the field 4 is indicating “B1-S1 OK”.
2.8.5 Block 036 - Post-Cat Oxygen Sensor Diagnosis
Enter the Basic Settings block 036.
The field 2 will say either 'TEST OFF/ON' before/while the test is running, and
either 'B1-S2 OK' or 'B1-S2 NOT OK' afterwards. It may take several minutes to
obtain result of diagnosis.
Do not continue with testing unless the field 2 is indicating “B1-S2 OK”.
2.8.6 Block 037 – Lambda System Diagnosis
Enter the Basic Settings block 037.
The value in field 2 is the post-cat lambda probe output voltage, with range of
0.10 … 0.95V. It should remain as constant as possible. Considerable voltage
fluctuations are an indication of catalytic converter damage. A constant voltage of
0.450V is an indication of damaged wiring.
24
The third field is lambda correction value between the pre and post-cat sensors.
It should stay below 0.02.
Note. If the lambda probe voltage is OK and the lambda correction value is still
greater than 0.02, even after a test drive, this is an indication of ageing of the
lambda probe upstream of the catalytic converter.
The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
either 'System OK' or 'System NOT OK' afterwards. It may take several minutes
to obtain result of diagnosis.
Do not continue with testing unless the field 4 is indicating “System OK”.
2.8.7 Block 043 – Ageing of Post-Cat Oxygen Sensor
Enter the Basic Settings block 043.
The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
either 'B1-S2 OK' or 'B1-S2 NOT OK' afterwards. It may take several minutes to
obtain result of diagnosis.
Do not continue with testing unless the field 4 is indicating “B1-S2 OK”.