7.3L Diesel Engines
Injector timing is controlled through Injector Driver Module (IDM) interfaced with PCM and no adjustment is possible. If system is not operating properly, complete a thorough basic inspection. See F - BASIC TESTING - 7.3L DIESEL (VIN F). If no problem is found, perform self-test to confirm correct operation of sub-system contribution to injector timing. See G - TESTS W/CODES - 7.3L DIESEL (VIN F) article.