Service Tips

To avoid any unnecessary searching and hunting on the 1992 9000 (005 model) while installing the optional cruise control, the vacuum hose for the cruise control pedal switches is located on the left side of the air distribution plenum as shown in the diagram.


Engine Bay Washing With Pressurized Water - 900, 9000

If the need or occasion should ever arise where pressurized water is to be used for cleaning the engine/engine bay area, use discretion and try to avoid the high tension leads, electrical connectors, dip stick sealings, etc. If the car is equipped with a distributor, cover it with plastic as best as possible.

It is possible in some cases for water to get into the harness for the Lambda sensor and follow the spiral-wound casing down to the sensor. The sensor is not water proof at this point as the sensor uses this entry point to take trace samples of atmospheric air to compare with the exhaust gases. If the water (especially combined with a detergent) gets into the sensor, it is possible for corrosion to build up on the internal terminals and damage the sensor which can result in the "Check Engine" light coming on. The only recourse at this point is to replace the sensor (not covered by warranty.) If it is suspected that only plain water has entered the sensor, it will evaporate and the sensor can work normally again.


Air Bag Fault Codes - 900, 9000

On 1990- 900 models and 1989-91 9000 models, there are three fault codes that are uncommon, but could possibly occur on these models that use the Siemens air bag system.

A PSI that explains this information will be issued shortly. Stickers to correct the fault code listing in the 900 and 9000 Air Bag Service Manuals will be attached to the bulletin also. The text of the sticker is repeated below for reference.

The fault codes are:

^ 35 High internal resistance in the left front
sensor

^ 36 High internal resistance in the right front
sensor

^ 55 The safety sensor in the SRS ECU has closed repeatedly



35 High internal resistance in the left front sensor REMEDY: Thoroughly check all wiring to the
sensor. If no fault is found, replace the left front sensor.

36 High internal resistance in the right front sensor REMEDY: Thoroughly check all wiring to the
sensor. If no fault is found, replace the right front sensor.

55 The safety sensor in the ECU has closed repeatedly REMEDY: Erase the fault code. Switch on the
ignition and wait for 35 seconds, then check if the fault code has returned. If the fault code does not return, do not replace the ECU. If the fault code does return, replace the ECU.