Engine - Excessive Cranking Time, Stalls After Starting

9225audi01

Group: 25

Number: 92-01

Date: 01/31/92


Subject:
Vehicle Stalls After Starting and/or Excessive
Cranking Time Before Starting


Model(s):
80/90, 100 with CIS-E III M.Y. 1987-1991


Condition:

Barometric Absolute Pressure Sensor (Altitude sensor) may cause differential pressure regulator current, to decrease in open loop mode.

Barometric Absolute Pressure Sensor Functional Check:

Requirement
^ Engine at operating temperature

Switch off ignition





Install VW 1315 A/1 test harness to differential pressure regulator Connect multimeter US 1119 or equivalent to VW 1315 A/1 and set to 2OmA scale.

Start engine and let idle

1. Disconnect oxygen sensor

- If differential current stabilizes at zero, the Barometric Absolute Pressure Sensor is OK (Refer to other Technical Bulletin and/or repair fiche for additional repair and diagnosis information.)

- If differential current reading decreases to -3 to -6 mA proceed to Number 2.

2. Disconnect barometric absolute pressure sensor with engine running





- If differential current reading stabilizes at 0 mA - replace barometric absolute pressure sensor. Reconnect oxygen sensor Check for fault codes Clear fault memory

Labor Operation:
Check and/or replace barometric absolute pressure sensor
2508 210 50 T.U.