Lambda (Testing)

[dobboy 231 2 Cars]

Has anyone got access to the info on testing the Lambda on the GTI6 engine?

 

It's not available on the 306 site

 

http://www.306gti6.com/forum/showthread.php?id=86026&page=1

[Ams 23 1 Cars]

Best I could find was this - http://www.306gti6.com/forum/showthread.php?id=108111

 

PS - Some other sensors you may want to check up on - http://www.306gti6.com/forum/showthread.php?id=80340

[dobboy 231 2 Cars]

cheers AMS.

 

I'll have a squint and compare using the post ^..... got the car up on all fours so can check no bother.

[Nic G 4]

If it's the same as the 4 wire on the 205, you can test it with a Multi Meter and a gas torch, once you have removed it from the exhaust.

 

1) Check the resistance across the heater wires (2 white wires), you should have between 5.5 and 8 ohms. If the resistance is 0 ohms, the heater is open circuit and not working!

 

2) Connect the multi meter to the sensor itself (black and grey wires) and set the meter to read Volts DC. with the sensor cold you should have 0.1 V. Now heat the business end of the sensor with a gas torch. Within 20 seconds the voltage should read about 0.8 volts. now remove the heat and within 4 seconds the voltage should be back down to 0.1 volts.

 

If the Lambda reacts in this way, all should be good.......

 

Nic

[dobboy 231 2 Cars]

Perfect Nik, that's very helpful.

 

My symptoms are it's idling around the 1000/1200rpm, it's just started recently, and I felt it was using a bit more fuel than usual the last time I was out.... maybe even smelling as though it's running a bit rich.

 

My lambda's only ~5000 miles old (Bosch), and I've previously replaced ecu/coolant temp sensor, cleaned ICV etc.

 

(Got a few new sensors at hand to swap on the throttle body, but my sixth sense is pointing to Lambda.... but hope i'm wrong)

[dobboy 231 2 Cars]

I've also bunged the ICV pipe when it was idling and it died, so i know i don't have an air leak issue.

[dobboy 231 2 Cars]

Swapped my Map sensor and no change. Swapped ICV and inlet temp sensor and started it up and it rev'd to 3000rpm. Tried keeping ignition lights on for 30s and switched off (to reset ecu) and restarted, again ran at 3000rpm.

 

Disconnected battery, and reconnected and it ran normal

 

Looks like battery has to be disconnected to reset ecu.