Very high idle - replaced iac, no change - dtc codes: 14, 15, 21, 22.
Speedometer not operating until engine warmed up - then fluctuates full scale, sometimes stops, very erratic. No other trouble codes have appeared. Engine cooling fan comes on with high idle.
When trouble first began, only code 15 showed. I replaced the engine coolant sensor - did not help.
Sometimes, after driving warmup, everything smooths out and engine functions properly. After parking a while, car starts in high idle again. Placing shift lever into drive really hammers the transmission with that high idle.
Where is the pcm engine ground located?
Tuesday, September 6th, 2011 AT 4:30 PM