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1996 Pontiac Grand Am TPS code PO122

Tiny
BART7851B
  • MEMBER
  • 1996 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 95,800 MILES
Car keeps wanting to fast idle around 1500 rpms eventually get check engine with code po 122 low voltage input. Have replaced tps, iac and temp sensor to no avail. If I unplug the tps and iac and plug back in. Idle returns to normal for a few hours. May go days with no problems then bam, idles up check engine slow shifting. I have an odb2 scanner. Is there something I should look for on live scan or could this be a bad ground.
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Monday, November 23rd, 2009 AT 8:47 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Clean TPS/IAC connections with electronics cleaner.

TPS has no direct affect on idle, it cannot let more/less air into engine, IAC can.

Scan IAC, look for large corrections, which would indicate bad IAC or ground.
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Tuesday, November 24th, 2009 AT 7:55 AM

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