DDEC III/IV Single ECM Troubleshooting

Section 4.1 DDEC Diagnostic Code

Section 4.1
DDEC Diagnostic Code

Troubleshooting of the DDEC III system and the DDEC IV system is identical. DDEC IV offers several additional features. The DDEC IV system allows for an increased processor speed and increased memory. DDEC III ECMs and DDEC IV ECMs are not interchangeable.‪

A diagnostic code indicates a problem in a given circuit (i.e. diagnostic Code 14 indicates a problem in the oil or coolant temperature sensor circuit). This includes the oil or coolant temperature sensor, connector, harness, and Electronic Control Module (ECM). The procedure for finding the problem can be found in Flash Code 14, refer to "14.3 Troubleshooting Flash Code 14" . Similar sections are provided for each code. Remember, diagnosis should always begin at the start of the section. For an oil or coolant temperature sensor problem, it will quickly lead you to section 14, but first you verify the code or symptom. ‪

Since the self-diagnostics do not detect all possible faults, the absence of a code does not mean there are not problems in the system. If a DDEC problem is suspected, even in the absence of a code, refer to "9.1 First Step for Diagnosing a Fault Within the DDEC System" , anyway. This section can lead you to other sections that can aid in the troubleshooting process - where DDEC problems may occur, but do not generate a code. Basic mechanical checks are not covered in this manual.‪


DDEC III/IV Single ECM Troubleshooting Guide - 6SE497
Generated on 10-13-2008

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