<DIV id=post_message_882160>What does this mean? I just got everthing back together from doing the head gasket. I check over everything and ill looks like everything is connected. I'm also throwing a Code 22 Throttle position sensor is to low and Code 35 idel speed error. Both sensors are plugged in and worked fine before everything was taken apart. Whats going on?</DIV>
<DIV>
</DIV>

 

Diag flag 54 first --- Five Volt Reference Ground.

The TPS needs to receive a 5V reference signal from the PCM. And presumably it is not getting it. Could just be a bad connection at the sensor itself.....

however.....

Flag 54 indicates that there is a short (to ground) in one of the circuits for the TPS, MAP, or HWS (Handwheel Sensor) -- if you have one.

Since you are receiving other codes that indicate TPS problems, concentrate efforts here....

With key off, Disconnect the wiring harness at the PCM and measure the resistance to ground for the TPS circuit connections at the PCM wiring harness:

NOTE: PCM harness Connector Pinout info from 91-93 Chilton Manual:

(Connector J2 B5) for 5V Feed to TPS
(Connector J2 A8) for TPS input
(Connector J1 D3) is the TPS Gound Connection

(TPS ground should of course be at ground)

My guess is that you will find the J2 B5 wiring at the PCM harness also shorted to ground or at a low resistance (a few hundred ohms).

If you then remove the TPS connections at the TPS, you should be able to determine whether there is a short in the wiring from the PCM or if it is internal to the TPS iself.

Once remedied, I believe the Code 22 (Throttle Position Sensor circuit low) and the Code 35 (Idle Air Control, rpm out of range) will self-resolve.

Please post resolution

Derf