Bosch LE/2 Jetronic (info and problems)

[Rich M]

Steve,
If it's any help, I came across some resistance values versus temperature
for the Croma coolant sensor:
 Croma 2000 ie Turbo 1986-90
Temp                Resistance
20°C                2-4k
50°C                600-900 ohms
80°C                200-400 ohms
90°C                100-300 ohms

These do show a bit of spread, but you may be able to make some measurements
at running temperature to see if there's something obviously amiss. If you
measure significantly higher than 300-400 ohms at running temperature, I
think this could be a chunk of your problem.

If it's of any help the same chart for the Vauxhall/Opel 1.8L (also LE2) is:
Vauxhall/Opel 1800i 1982-86

Temp                Resistance
0°C                  4.8-6.6k
20°C                2.2-2.8k
40°C                1.0-1.4k
80°C                270-230 ohms
100°C              200 ohms approx

I would expect the two to be pretty close - the two are specified at
slightly different temperatures, between the two you may be able to make
some sense?
FWIW this data is from a Haynes vehicle data manual.

Rich


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Steve Spiers
> Sent: 14 May 2000 13:19
> To: diy_efi at diy-efi.org
> Subject: Bosch LE/2 Jetronic (info and problems)
>
>
> Hi
> =
> =
> How dependent is the ECU on coolant temperature? I suspect that
> the thermostate is
> either stuck open or has been removed. The temp gague will only
> just get off the
> absolute bottom of the scale. Could this be the sole problem
> causing the ecu to
> run in "cold start" mode?
>
> Thanks for any help in advance
>
> Steve

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