Resetting and Reactivating Engine Control Module Memory

Using Impulse Counter Scan Tool*

Review the "Important Notes" portion of these procedures. Important Notes

Connect impulse counter scan tool to data link connector (X11/4) according to connection diagram. Impulse Counter Scan Tool

- Clear diagnostic trouble code (DTC) memory. HFM-SFI (Sequential Multiport Fuel Injection and Ignition)
- After the number "1" appears, press start button for 6 to 8 seconds.
- Switch ignition OFF and wait a minimum of 2 seconds.
- Turn ignition ON, wait a minimum of 10 seconds and then start engine.

NOTE: Control modules manufactured by Bosch up to 8/93, the start button must be pressed 8 to 9 seconds to reset and reactivate the engine control module memory.

* Resetting and reactivating the engine control module can be performed with the impulse counter scan tool only on vehicles up to hand-held tester (HHT) Diagnosis Version 46. On vehicles as of HHT Diagnosis Version 49, it is possible only with the HHT.