Pin voltage (value) charts are used for diagnosing intermittent symptoms and faults that are unable to be resolved during self-diagnostics. Pin tests ensure the Powertrain Control Module is receiving and transmitting proper voltage and other signals.
Parameter Identification (PID) values also check PCM input and output signals. PID values are retrieved using an OBD-II compliant scan tester. PID values can only be accessed on OBD-II models. See PID TESTING under TEST PROCEDURES.
Before performing tests, ensure mechanical conditions have been inspected and self-diagnostics has been attempted. Service bulletins may also be helpful in correcting a hard to diagnose problem.
In order to read Parameter Identification (PID) values, a New Generation Star Tester (007-00500) or other OBD-II compliant scan tester is required. A DVOM, 104-pin Breakout Box (014-00950) and appropriate adapter cable are required to check pin values. Manufacturer does not recommend checking values directly at PCM connector, as damage to wiring harness or Powertrain Control Module (PCM) harness connector may occur.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See the COMPUTER RELEARN PROCEDURES
article in the GENERAL INFORMATION section before disconnecting battery.
Disconnect negative battery cable. Access PCM, and disconnect PCM connectors. Connect breakout box to PCM harness connector and PCM. Reconnect negative battery cable. Take desired measurements between ground pin and specified pin on breakout box. See PIN VOLTAGE CHART.
Connect OBD-II compliant scan tester to Data Link Connector (DLC). See TEST EQUIPMENT. Access DIAGNOSTIC DATA LINK menu, and select PCM. Highlight and select PID/DATA MONITOR AND RECORD. Highlight and select the PID desired abbreviation(s). Press the "7" button to view all selected PIDs.
Fig. 1: PCM Connector Terminals
Courtesy of FORD MOTOR CO.