Initial Inspection and Diagnostic Overview

IGNITION E.C.U. EZ 200 K





Principle of the autodiagnosis
The EZ 200 K ignition E.C.U. (H96) incorporates an "AUTODIAGNOSTIC" feature which enables it to identify some of the eventual faults which may occur in the system during operation. By the same token, it is also able to alert the driver of the existence of this fault. This is done through the indicator in the lower left corner of the instrument cluster (orange LED). (L32).

The number of blinks of this indicator will determine which component within the system is at fault.

Detection range of the ignition E.C.U. EZ 200 K
It controls and checks the following:
- continued detonation,
- battery voltage (M45),
- electronic circuit which corrects detonation (internal to the E.C.U. (H75)),
- the detonation sensor (Ml 32),
- the potentiometer and its electrical connections (M669),
- the engine load input signal emanating from the injection E.C.U. (H58).

Operation of the LED
Normal operation
- Ignition key "ON" --> LED ON
- Engine started --> LED OFF
If the LED remains ON or OFF: check its power supply and its ground
- Occasional sporadic "flashes" of the LED --> NORMAL OPERATION
- Constant blinking of the LED --> FAULT IN THE IGNITION SYSTEM

As a safety measure, as soon as a fault in the system is detected, the system will automatically post a retard to the spark advance (-15°)

This retard will be reflected by a lack of power and performance of the engine.

The repair technician will be able to locate the failed component, based on the LED's number of blinks per cycle and the corresponding table.

NOTE: The speed of the display of the blink cycles will relate directly to engine rpm. It is therefore IMPERATIVE to make the determination of the disgnostic cycle at idle by counting the number of blinks.