DTC 57, Pcm 5-Volt Shorted: Notes
The 5-volt reference is a non-varying calculated voltage. DTC 57 will set when 5-volt reference is less than one volt. PCM will default to backup fuel, no EGR and no turbo boost.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This step confirms that a DTC is still present.
- This step checks that a 5-volt reference is present from PCM.
- This step determines if a short to ground is present in 5-volt reference circuits or in PCM.