1994 Vauxhall Astra engine managmentligt

1994 VAUXHALL ASTRA
98,000 MILES • 4 CYL • FWD • MANUAL
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APOWNEY
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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
May 28, 2009 at 10:15 AM
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DAVE H
  • ✓Experienced 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


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May 28, 2009 at 12:00 PM
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APOWNEY
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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
May 29, 2009 at 1:37 AM
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DAVE H
  • ✓Experienced 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


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May 30, 2009 at 11:37 PM
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APOWNEY
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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
May 31, 2009 at 5:43 AM
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