Engine - Runs On After Shutting Off
85saab03FILE IN S.I. Man. VOL. I
SEC. 3 PG. 89
Service Information
SUBJECT: ENGINE RUN-ON AFTER SHUTTING OFF ISSUE: 08/85-782
M85 900 WITH 8 VALVE ENGINE SUPERSEDES: 05/85-760
A complaint of slight engine run-on after shutting off the car may be experienced on naturally-aspirated 1985 900's with 8 valve engines. This has been diagnosed as alternator feed-back to the fuel pump relay and can be corrected by connecting a diode in series with the D+ terminal of the alternator.
The diode may be added to a car which had a Turbo fuel pump relay installed (see 05/85-760).
Diode P/N 85-30-966
Electrical Terminal P/N 79-69-231
Electrical Terminal P/N 78-29-609
Modification Details:
1. Disconnect the negative battery terminal.
2. Remove the main fuse panel from the main fuse box and locate the GN/VT wire running into the fuse box from the engine compartment.
3. Cut the GN/VT wire in half and strip back the insulation from the two ends.
Attach electrical terminal P/N 76-69-231 (5 mm, blue insulator) to this wire.
Attach electrical terminal P/N 79-29-609 (6.3 mm, red insulator) to the wire running to black 29 pin connector position C1.
Connect in the diode to these two terminals and cable tie the diode to the harness.
NOTE: The diode features uneven size terminal ends and can only be connected in one direction. Test your repair by turning the ignition key to the "on" position. If the charging light does not come on with the ignition key the diode must be reversed.
4. Refit the fuse panel.
5. Reconnect the negative battery terminal and reset the vehicle's clock.
Warranty Information: For warranty repairs, use Failure Code 36538-00-0-01-05. Labor Allowance is 0.3 hour which is entered in the Straight Time area.