Control Modules

Manufacturer has found many control modules that have been replaced were not the cause of the problem and replacement of the control module did not correct the problem. Upon examination, these control modules were found to be free of defects. Before replacing a suspect control module, preform the following:

• Connect test light, DVOM or scan tool and wiggle wiring harness at several points and in different directions to detect intermittent opens and/or shorts. See WIRING DIAGRAMS  . Perform repairs as necessary and recheck.
• Ensure all control module power supply circuits are okay.
• Ensure all control module ground connections are clean and tight.
• Using a scan tool or DVOM ensure control module input and output signal values are reasonable. Before replacing a TRIONIC engine control module or DICE control module, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
• Using a scan tool, ensure that all functions are operating properly. A fault in one output signal may affect another output signal.
• If problem continues, replace control module with a known-good control module and recheck. Replace control module if problem is corrected.