1994 Vauxhall Astra engine managmentligt

APOWNEY

MEMBER
1994 VAUXHALL ASTRA
4 CYL
FWD
MANUAL
98,000 MILES

Hi hope you can help me I have a vauxhall astra gsi 1.8 c18xe engine ive got 5 fault codes stored in my ecu numbers are 21 38 56 71 91. For some reason they are all voltage high, I have reset my ecu but as soon as I plug it back in in comes up with the same codes hope you can help me in any way

Thursday, May 28th, 2009 AT 5:15 PM

4 Replies

DAVE H

MECHANIC
13,384 POSTS

I do not have a list of the fault codes for your vehicle .. if you could supply a full description of all the codes we will try and work out where your fault lies ?

let me know

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Thursday, May 28th, 2009 AT 7:00 PM

APOWNEY

MEMBER
3 POSTS

Fault code 21=throttle position sensor voltage high, 38= oxygen sensor circuit voltage high, 56= idle air control valve voltage high, 71= intake air temp sensor voltage high, 91= oxygen sensor heater votage high

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Friday, May 29th, 2009 AT 8:37 AM

DAVE H

MECHANIC
13,384 POSTS

Hello.

I don't believe all these sensors have gone bad at the same time ? ... I believe you either have a short to earth on the PCM (computer ECU) or you have a bad PCM and it needs replacing ..check your live feed and earth at the PCM or replace the PCM

hope this helps

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Sunday, May 31st, 2009 AT 6:37 AM

APOWNEY

MEMBER
3 POSTS

Thanks for your reply but forgot to mention the light only comes on when the engine gets to temperature and the idle goes down to 500/600 rpm I think myself it may be the coolant temp sensor does that help in any way

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Sunday, May 31st, 2009 AT 12:43 PM