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2000 S70 ETM/MAF diagnostics

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
This topic is in the MVS Volvo Repair Database » MAF Diagnostics
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precopster
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Re: 2000 S70 ETM/MAF diagnostics

Post by precopster »

The thick green wire at the ETM connector has 12V+ and the thick brown wire is ground. Remove the ETM and check them at the ETM supply connector.

If you have a voltage drop at this connector of say 1 volt that is substantial enough to look further in to the wirimg. A correctly functioning ETM draws about 1.8 amps
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Caberguy
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Joined: 12 June 2014
Year and Model: 2000 S70
Location: Milwaukee

Post by Caberguy »

Voltage drop across those wires was about .09 (12.44 to 12.35), then I double checked a little while later after working on a couple of other things (and the radio draining the battery a bit) and it was .1 (12.25 to 12.15).
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Caberguy
Posts: 58
Joined: 12 June 2014
Year and Model: 2000 S70
Location: Milwaukee

Post by Caberguy »

Replaced the MAF with a used one (unknown, untested). No change. Obviously it could be another bad MAF, but still no codes. I guess it's down to the ETM. No?
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