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Date: Thu, 20 Mar 2003 22:26:45 GMT
From: hohnopsamlid.invalid (Goran Larsson)
Subject: Re: Switching to DI

In article <3e7983b3$>, **-** <> wrote: > Any reason for this? Does the DI talk to the Fuel ECU? Input signals to the DI are triggers for the sparks, i.e. the DI needs something to figure out when to fire the spark plugs. The DI cartridge also signals the ECU when it detects knocks (takes the job of the old knock sensor microphone) and ionisation (i.e. it detects that combustion has taken place). Early DI cars (in 1988, called DI/APC) used a control box combining whatever was needed to drive the DI and to perform the APC functions. The fuel ECU was the same as for pre DI cars. This system was replaced (in 1993) with the Trionic 5 ECU. "Tri" as it combined three functions; ignition, APC, and fuel ECU. Trionic 5 was replaced by Trionic 7 for the 9-5 and later OG 9-3. The new 9-3 use Trionic 8, but the DI system is completely different in T8 cars. -- G–ran Larsson

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