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Old 11-11-2003, 11:08 PM
JetForeman
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I found this description in ALLDATA that better explains what the sensors do. After reading it myself it appears the cam sensor will iindeed keep it from starting if it's bad.

READ ON!!!



Engine Speed, Crankshaft Position, Ignition Circuit Recognition
Information regarding engine speed, crankshaft position and ignition circuit recognition is transmitted from the crankshaft position sensor (L5) in the form of alternating voltage to the engine control module. A analog-to-digital converter transforms the alternating voltage signal into a square wave signal (TN-signal).

Engine speed is calculated by timing every half revolution of the crankshaft.

The crankshaft position is determined by voltage signals from the flex plate segment (A).




Recognition of ignition circuit 1 for cylinders 2 and 5 is transmitted by a permanent magnet on the segment (arrow).

The engine speed, crankshaft position and ignition circuit 1 recognition signals are required for the engine control module to perform the following functions:

* Fuel injection:
* minimum injected fuel quantity,
* start control,
* injector sequence synchronization,
* warm-up enrichment,
* acceleration enrichment,
* WOT (full load) enrichment,
* deceleration shut-off.
* Ignition:
* at start,
* during warm-up,
* at CTP (idle),
* at WOT (full load),
* at deceleration shut-off.
* Catalyst warm-up.
* Charcoal canister purging.
* Camshaft adjustment.
* Anti-knock control.
* Engine rpm limiter.
* Transmission overload protection.




Camshaft Position, Ignition TDC, Cylinder 1
The camshaft position sensor (L5/1) transmits an alternating voltage signal for every 20°rotation after TDC. This signal is converted into a square wave signal by the analog-to-digital converter and processed by the engine control module.

The camshaft position signal is required by the engine control module to perform the following functions:

* Fuel injection:
* injector sequence synchronization.
* Ignition:
* at start,
* fuel shut-off during ignition failure,
* anti-knock control.

Vehicle Speed Signal
The vehicle speed signal is transmitted from the ABS/ASR or ABS control module (N3O/1 or N30), to the electronic accelerator control module (N4/1) or the cruise control/idle speed control module (N4/3) and on to the engine control module (N3/4) via CAN.

The vehicle speed signal is required by the engine control module to perform the following functions:

* Fuel injection:
* deceleration shut-off.
* Engine rpm limiter.
* 2->3 upshift delay.
* Drive shaft - maximum rpm limitation.Engine Speed, Crankshaft Position, Ignition Circuit Recognition
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