Diagnostic Aids

Check for proper operation of glow plugs if glow plug relay is stuck on. When glow plugs are commanded on by scan tool, an internal PCM timer protects glow plugs from damage by cycling them on for 3 seconds, and then off for 12 seconds. Ensure glow plug output feed wire nut and battery feed wire nut are tightened to 44 INCH lbs. ( 5 N.m).

Check for intermittent problems (i.e., poor connections, rubbed through wire insulation or broken wire inside its insulation). See appropriate TROUBLE SHOOTING - NO CODES article.