X_Racing1

So I noticed the tach wasn't working about a week ago I hooked up the old Torque pro and it shows no codes other then my knock senor bad but it does show the computer is getting a tach signal it shows up on it. And the tach needle does wiggle. Any ideas?

FFDP

iTrader: (2)

The cluster might have a bad stepper motor.

X_Racing1

according to a couple places ive called or emailed the 99-02 doesnt have stepper motors like the 03 and up and dont really have that problem. i have hooked up the torque app and the computer is getting the signal but not the instrument cluster and so im lost every once in a while it will work for 30 seconds maybe a minute then gone so idk i need help

2xLS1

iTrader: (25)

Scanner rpm gets it's signal from the crank sensor. Tach output to cluster is generated by the cam sensor. Hence why if you connect an aftermarket tach you have to set it up for a 4 cyl signal. PCM red connector pin 10 is the tach out.

X_Racing1

wouldn't i get a code if the cam sensor was acting up?

2xLS1

iTrader: (25)

I'm just explaining why you can show RPM with a scan tool but no dash tach. Since it's intermittent I would look at the pin in the PCM connector. Clusters come out easy too. You might try reseating the cluster connector or look for a broken solder on the cluster circuit board.

X_Racing1

ok i gotcha thanks i will pull the cluster out tomorrow and take a look. Thanks again

2xLS1

iTrader: (25)

Also P0654, RPM Output Circuit, is a No MIL code so if it is setting that code it won't turn the SES light on. You will have to check for codes with a scan tool to see if it is setting

X_Racing1

I checked no code

X_Racing1

So I bought another Speedo cluster mainly because I wanted the trans temp gauge but the tach is still not working so any other ideas. Someone on another forum said the Ign Switch does that make sense to anybody.