Question about 1994 Isuzu Trooper

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My 1994 isuzu bighorn refuses to go into overdrive.The speedo started to jump up and down eratically,then stopped working completely.I've changed the speedo head,throttle position sensor and gearbox speed sensor and gearbox filter,but nothing has changed.Still showing fault throttle position sensor output voltage too high and no overdrive.Any ideas?

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stevenhurc
  • 450 Answers

SOURCE: Speedo stopped working

check wire/wiring connector on right rear section of transfer case.
disconnect wire connector and remove and inspect gear drive for worn teeth including gear inside case.

Posted on Jul 29, 2009

honeymokey
  • 3113 Answers

SOURCE: replace speedo sensor on isuzu

www.myisuzuparts.com you need a speedo gear

Posted on Jun 11, 2010

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