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1998 V70 Diagnosing AT-311 Fault

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
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whirligig
Posts: 26
Joined: 23 November 2009
Year and Model: S90/V70 1998
Location: Los Angeles

1998 V70 Diagnosing AT-311 Fault

Post by whirligig »

On my 1998 V70, I'm trying to diagnose a AT-311 fault that my mechanic reported to me. He's unable to fix it after replacing the engine speed sensor. He didn't charge me but suggested I take the problem to the dealer.

Not to give up so quickly, I measured the new sensor and its 468 ohms. So it's in spec. I went by the 1995 850 Auto Trans Diagnosis guide, and I measured the resistance of TCM pin 1 and 2 on connector A and it's open. Then I checked pin 1 and 2 to sensor connector pins and they're both open. After comparing the TCM connectors to the 1995 document, I suspect I need to find the right schematic or pinout diagram. The TCM part number is P09442108. Can anyone point me in the right direction? Thanks
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whirligig
Posts: 26
Joined: 23 November 2009
Year and Model: S90/V70 1998
Location: Los Angeles

Post by whirligig »

Ooops, never mind. I found a copy of the C/S/V70 service manual on my tablet.
Looks like the TCM pins were right. I'll need to check the connectors on the transaxle.
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