banzaitoyota Posted April 19, 2012 Share Posted April 19, 2012 On the way home today, CHECK ENGINE light came on. Then a experienced a surging idle and intermitant tach signal. Plugged in code reader (Actron CP9180 and it can not establish communications with vehicle. I stopped by and tried another code reader and got the same results.What next? Link to comment Share on other sites More sharing options...
Administrator Mopar1973Man Posted April 20, 2012 Administrator Share Posted April 20, 2012 Double check the wiring in the OBDII port... Link to comment Share on other sites More sharing options...
banzaitoyota Posted April 20, 2012 Author Share Posted April 20, 2012 Disconnected the battteries, removed and cleaned all fuses/relays withh contact cleanr; no codes ths morning Link to comment Share on other sites More sharing options...
dripley Posted April 20, 2012 Share Posted April 20, 2012 Was your scanner able to comunicate with the truck? Link to comment Share on other sites More sharing options...
banzaitoyota Posted April 21, 2012 Author Share Posted April 21, 2012 Was your scanner able to comunicate with the truck? Still no communication with the truck thru the DLC --- Update to the previous post... Went to the beach for the weekend, but before i left i picked up some backprobes for the multimeter so i can test Sunday Link to comment Share on other sites More sharing options...
banzaitoyota Posted April 22, 2012 Author Share Posted April 22, 2012 Harness is good in regards to the DLC pinout. Unwrappped the harness and rewrapped it. have not figurd out what signals i sould be getting at the DLC Link to comment Share on other sites More sharing options...
banzaitoyota Posted April 25, 2012 Author Share Posted April 25, 2012 Just got done testing. At the DLC Connector: Pin 3 0.02 V Pin 4 Open, traced to DLC Connector using ECT2000 (Power Probe short chaser) Pin 5: Good Ground Pin 6: 4.98V Pin 7: 4.98 V Pin 11: 2.43 V Pin 14: 4.29V Pin 16 12V Will back trace Pin 4 from G200 Ground termination to DLC Connector to verify problem is the terminal in the DLC. Link to comment Share on other sites More sharing options...
banzaitoyota Posted April 25, 2012 Author Share Posted April 25, 2012 Here are the values After I fixed the ground open on pin 4 Link to comment Share on other sites More sharing options...
banzaitoyota Posted May 1, 2012 Author Share Posted May 1, 2012 Check Engine Light came on again, unnablle to connect tto vehhicle.. does anyone have a good set of reference values at tthe DLC connctor i can compare to? Link to comment Share on other sites More sharing options...
banzaitoyota Posted May 3, 2012 Author Share Posted May 3, 2012 Anyone? Link to comment Share on other sites More sharing options...
Administrator Mopar1973Man Posted May 4, 2012 Administrator Share Posted May 4, 2012 You got a problem on that leg of the CCD network it show be roughly 2.4-2.5 volts. So double check and make sure there is no other shorts... Might be a damaged device (Overhead console, radio, etc.) 1 Link to comment Share on other sites More sharing options...
banzaitoyota Posted May 5, 2012 Author Share Posted May 5, 2012 Driving down the road today at 45mph, 16psi fuel pressure: Lost tach, CEL came on and engine cycled between 600 and 1200 rpm. Pulled over and tach came back, engine smoothed out and idled normally. Still unable to connect with code reader.All overhead console functions are working.Radio WorksPulled abs plugs and still got same voltage to Pin 4 Link to comment Share on other sites More sharing options...
Administrator Mopar1973Man Posted May 5, 2012 Administrator Share Posted May 5, 2012 Sound like a loose connection or a short to ground somewhere. Link to comment Share on other sites More sharing options...
banzaitoyota Posted June 4, 2012 Author Share Posted June 4, 2012 ll, keeps getting worse, Now I loose tach signal and the engine surges, Change the cam position sensor and still have the problem. looks like PCM time:mad: [*] Link to comment Share on other sites More sharing options...
Cummin Dodge Posted June 4, 2012 Share Posted June 4, 2012 I had the idle issue in my truck for a couple of weeks off and on it finally threw a crank sensor code. I replaced it and problem has deceased since. When it my truck was idling at a stop light it would cut out for a split second and the tach would quit registering. Something maybe you could look at before you change out the expensive pcm. Link to comment Share on other sites More sharing options...
banzaitoyota Posted June 29, 2012 Author Share Posted June 29, 2012 Truck is running good now with a crank position sensor and another PCM; but still unable to read codes Link to comment Share on other sites More sharing options...
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