C70: - P1600 ETM fault but only when cold

fatty · Apr 24th, 2019, 09:16

Hi, I am a returning member but I haven't been here for so long I have disssapeared off the system

I am back with an issue that I just cant seem to fathom.

I have a 2001 C70 Convertible. its the 2.0 LPT turbo. when the engine is cold it runs extremely lumpy and gives fault code P1600 with a pending code of P1608. IIRC these relate to the troublesome ETM. I have cleaned the throat and butterfly but still the symptoms remain.

However. once the temp guage hits the normal operating temp, if I switch the car off. leave it 15 minutes and restart it, there are no warning lights and the car runs perfectly. if I remove the fault codes they do not return until the car is cold again and it runs terribly again.

I just wondered if anyone had come across something similar?

I am reluctant to replace the ETM just yet as if it is a fault elsewhere I will be wasting my hard earned. If it was consistent at all temps I would of course not hesitate.
The car is mine very cheaply and I have it advertised for sale but I would rather keep it and spend some cash on it if I can definitely fix it.

volvo again · Apr 25th, 2019, 08:03

As it seems to be an issue when cold, have you considered a faulty temperature sensor?
Just a thought but I realise the codes don't suggest this.

Apr 24th, 2019, 09:16	#1
fatty New Member Last Online: Apr 24th, 2019 09:19 Join Date: Apr 2019 Location: newcastle	P1600 ETM fault but only when cold Hi, I am a returning member but I haven't been here for so long I have disssapeared off the system I am back with an issue that I just cant seem to fathom. I have a 2001 C70 Convertible. its the 2.0 LPT turbo. when the engine is cold it runs extremely lumpy and gives fault code P1600 with a pending code of P1608. IIRC these relate to the troublesome ETM. I have cleaned the throat and butterfly but still the symptoms remain. However. once the temp guage hits the normal operating temp, if I switch the car off. leave it 15 minutes and restart it, there are no warning lights and the car runs perfectly. if I remove the fault codes they do not return until the car is cold again and it runs terribly again. I just wondered if anyone had come across something similar? I am reluctant to replace the ETM just yet as if it is a fault elsewhere I will be wasting my hard earned. If it was consistent at all temps I would of course not hesitate. The car is mine very cheaply and I have it advertised for sale but I would rather keep it and spend some cash on it if I can definitely fix it.

Apr 25th, 2019, 08:03	#2
volvo again Master Member Last Online: Apr 17th, 2024 12:04 Join Date: Jun 2018 Location: Presteigne, mid Wales	As it seems to be an issue when cold, have you considered a faulty temperature sensor? Just a thought but I realise the codes don't suggest this.

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