Morfeus17

Need your help with this one guys. That dam paninc light came on today. According to the code book, 0104 points to Vehicle Speed Sensor. And 0504 points to "Automatic Transmission Control Unit Signal to ECU". I hope this is not a critical problem, the car runs great!! However, in a couple of weeks I will be converting over to 5speed. Hopefully, this may not be to much of an issue, once the conversion is completed??? Feedback would be great.. Thanks..

Ramius83

Well, the 0504 won't matter anymore after the conversion, but that Speed sensor needs to be looked at.....

Ramius83

But I forgot to mention, check the sensor. Look in your Haynes manual to find its location. Its connection might have come loose....Also check the wires leading from it....

Morfeus17

OKay... I will look in the haynes Manual to find this unit.. Thanks..

SLC I30t

iTrader: (1)

1st, did you do the Speed govenor mod? if so... you'll have this error forever.

DTC 0104

Diagnostic Trouble Code 0104 points to a problem with the Vehicle Speed Sensor or the associated wiring.

The Vehicle Speed Sensor installed on the transaxle. The part inside the transaxle has a plastic gear which is
driven by the internal parts of the transaxle. The part outside is a signal generator which produces a square
wave of amplitude 5.2 volts and frequency proportional to vehicle speed.

Remove the VSS, attach a voltmeter to the electric leads, and spin the gear
by hand. If you get zero volts, it's dead.

One owner discovered his VSS was not fully seated in the transaxle. He just tapped it inward, and retightened
the 10mm mounting bolt.

For more information please refer to the Chilton repair manual (page 4-22) or the Haynes repair manual (page 6-16)

DTC 0504

Diagnostic Trouble Code 0504 points to a problem with the Automatic Transmission Communications line.
Pulse signals are exchanged between the Engine Control Module and the Transmission Control Module to assure
smooth shifting during hard acceleration or deceleration.

This malfunction is detected when the ECM continuously receives an incorrect voltage from the TCM.
Possible causes include...
- Harness or connectors (The communications line circuit between the ECM and the TCM is open or shorted.)
- TCM
- Discharged or faulty battery

Morfeus17

No.. I never did any mods to the govenor. First thing first, I need the Chilton repair manual, because the haynes manual may not have this information. Also, I will be converting my car to 5speed soon. Any ATC wiring will be removed any way.. I am also getting the quaife diff. And one of the prereqs. is to by this plastic gear which goes into the tranny. I will cheack for any loose connections. Thanks..