Roadmaster Estate Wagon V8-350 5.7L (1993)
to flash DTC 12/51, but not enable serial data.
5.
Although the ECM is powered up, a "Cranks But Will Not Run" symptom could exist because of an ECM or system problem.
6.
This step will isolate if the customer complaint is a MIL or a driveability problem with no MIL. An invalid DTC may be the result of a faulty scan
tool.
7.
Comparison of actual control system data with the typical values is a quick check to determine if any parameter is not within limits. Keep in mind
that a base engine problem (i.e., advanced cam timing) may substantially alter sensor values.
8.
Installation of a scan tool will provide a good ground path for the ECM and may hide a driveability complaint due to poor ECM grounds.
9.
If the actual data is not within the typical values established, the C-CHARTS will provide a functional check of the suspect component or system.
