90 Series Factory Cruise Control issue - Brake pedal deactivation.

[daewoo Lurker Find all posts View Profile Close daewoo]

I've search the forum but haven't found anything similar.

90 Series with Factory Cruise control. VJZ95 (Petrol) GXL Snowy.

Cruise control functions properly, turns on, sets, increase speed, decrease speed, disconnect, reconnect all work as normal.

but, if you tap the brake pedal to disconnect, it will disconnect and immediately reconnect (accelerating back to speed).

If you hold the brake pedal, it disconnects and goes into an error mode (cruise control light on dash flashes slowly) and can not be reconnected until turning CC off and on again and resetting.

Any ideas how to work through the issue?

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

Don't have the wiring diagram or info for a 90 series but this is an extract from a 1GR Petrol in a 120 and hopefully similar enough to give you an idea.

The cruise uses resistance between the CCS and E1 pin on the Engine ECU to change settings and a ground to turn on/off via the column switch.

At a guess you have a resistance in the circuit somewhere that is similar to commanding resume and competing with the brake switch signal when held so generates the error.

Edit: One thing I did notice on the 120 is on the petrol the E1 has the ground point on the cylinder block as shown in the pic below but the diesel didn't have this. So not certain if the ground was missing on yours it would allow the E1 to float to a point it could cause issues like you are experiencing.