EZK Ignition System Tester Modification (08/89-1170)
WARNING: This page is about the 9000 S, 4D Hatchback, Automatic, which is a different variant/trim than selected.
Publication date: 1970-01-01Reference number: 08/89-1170
EZK IGNITION SYSTEM TESTER MODIFICATION
TECHNICAL SERVICE BULLETIN
Reference Number(s): 08/89-1170, Date of Issue:
EZK TESTER MODIFICATION
APPLICATION
Model(s): 1989 Saab 900, 900S and 9000S
Group: Electrical
Bulletin No.: 08/89-1170
SERVICE INFORMATION
Because of changes in the EZK ignition system of M89 900, 900S and 9000S models, the EZK Tester, P/N 83 94 058, must be modified. The modification of the tester is required because there is enough feedback current to cause the knock sensor indicator on the tester to incorrectly show a continuous knocking condition while the engine is running. By adding a diode as described in the modification procedure, the tester will function correctly on M89 models. This modification will not affect the operation of the tester on -M88 models.
PARTS REQUIRED
| DESCRIPTION | PART NUMBER |
|---|---|
| Terminal | P/N 79 69 231 |
| Terminal | P/N 78 29 609 |
| Diode | P/N 85 30 966 |
PROCEDURE FOR MODIFYING THE EZK TESTER
- Slit approximately four inches of the wiring harness sheathing at the connector end (Fig 1 ). Pull back the sheathing to provide access to the wiring harness.
- Locate the white wire in the harness. Remove a three-inch section of the wire, leaving a pigtail projecting from the connector. Strip back the insulation on both ends of the wire (Fig 2 ).
- Attach the blue insulated terminal (P/N 79 69 231) to the end of the white wire where it exits the harness sheathing.
- Attach the red-insulated terminal (P/N 78 29 609) to the pigtail on the test harness plug.
- Connect the diode (P/N 85 30 966) to the two terminals noting the terminal size difference between the two diode connections (Fig 3 ). Cover the diode with the wiring harness sheath and wrap securely with electrical tape.
- Test the modified tester by connecting it to a M89 900, 900S or 9000S. Check that the knock sensor LED does not light with the engine idling, but still indicates knocking during acceleration.