2008 Vauxhall Zafira B 1.9 diesel INTERMITTENT accelerator throttle pedal failure P1120 P1122

Customer phoned me up the night before telling me thay his 2008 Vauxhall Zafira B 1.9 Diesel wouldn't accelerate , no throttle pedal response at all.

He limped to the workshop just with the engine revs and When I arrived in the morning and checked the car , everything was absolutely fine the vehicle revved fine but the engine light was still on.

Scanning the vehicle the obvious codes related to the issue was P1120 Accelerator pedal position 1 and 2 signal incorrect ratio ( NOT PRESENT ) and P1122 Accelerator pedal position sensor 1 and 2 signal incorrect ratio ( NOT PRESENT ) and few other code within the transmission module.

I've seen this issue on a Vauxhall Astra before which ended up being corrosion within the ECU module but another common place for corrosion that can give the same symptoms is the under the bonnet fuse box.

I found a TSB using http://www.DDTSB.com which ended up being very helpful giving me the voltage for the accelerator pedal sensor 1 and 2 and also the fuse box pins .

If you wish to subscribe to Diagnose Dan TSB visit http://ddtsb.com

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