nader

Yes rpm is 1200 with heater switch on in ECUTalk and tacho and matches upward. The only difference is when rpm goes below 1000rpm. Well I have to be patient and slowly check bit by bit until I find the problem. I have been in contact with a mechanic and he suggested to change speed sensor which there is one on right hand side of transfer case. I am checking voltage according to A\T manual.

Finally cable arrived last week and I had to send it back to replace it with OBD II type. The idle RPM showed is normal in ECUTalk, 750-80. There is two option in graphic which are similar reading, RPM Pump and RPM. Any idea why idle RPM are different in car and ECUTalk?

Thanks, it's great to have recommendation from people like you to which way to go. Diesel engine is new to me but I am willing to experiment and learn about it. I will order the cable from the ECUTalk website and see how it goes. Cheers

I remeasured MAF third connection against engine earth in neutral position while idling, 15.2V and against battery and the body 7.4V. I also checked resistance (continuity) terminal three against engine earth, 0.4 ohm. I cleaned and repaired battery area, there was lots of build up acid and damaged to paint underneath and around earth connection to the body. Still there is no TDC when connecting OBD terminal one and eight, Is any benefit connecting to ECUTalk software, is it possible to make changes to ECU with this software? The J1962 cable are sold over internet with big differences in price,are all are compatible with Patrol Y61? Do you have any instruction how to make one?

Yes I did measure against earth on main car body ground. I will check earth connections and remeasure AMF against ECU earth later on and update you soon. Cheesrs

Thanks again keeping in touch , yes, everything seems normal except low idle rpm. When at idle turning heat switch on,idle goes up to 1200, when at idle, aircon switched on idle goes up to 650 rpm. But also as I mentioned in my first post, checking AMF when engine warmed up and idling,the terminal three should read 0v not 3.5v. I am wondering somewhere in engine componet sending wrong voltage to ECM to keep the idle at 400rpm.

Yes engine rpm goes up when heater and air con is on. I just picked up Max Ellerys workshop manual which covers all Patrol 98-09. It says there is no need to test and correct idle for ZD30 engine as it is controled by ECM. The engine idle is 400 rpm and a bit of vibration in top cooler cover, is that normal or is this start of serious problem? may be there is some fault in ECM it self.

Thanks Rumcajs for your reply, I do have laptop but I guess I need special connector to access data from engine. Do you know where to get software and hardware to follow the problem?

I bought my 2004 Y61 couple weeks ago and I noticed engine vibration and low rpm. I thought It can be fixed it easy. I cleaned MAF, and checked voltage according to instruction. Terminal one 1.65v, two 5.11v, three 3.5v and four 12.38. Any idea about terminal three voltage and where it might comes from? The idle speed is 400 rpm, cold and warmed.