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

4 Replies

DAVE H

MECHANIC
13,383 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

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

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

Was this

answer

helpful?

Yes

No

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

DAVE H

MECHANIC
13,383 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

Was this

answer

helpful?

Yes

No

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

Was this

answer

helpful?

Yes

No

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