Shift to the D position, and measure the voltage between PCM connector terminals A18 and A8 or A9. Is there 1.5−3.5 V?
YES | - | Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM .■
NO | - | Replace the output shaft (countershaft) speed sensor, then go to Step 30 .