D Group 28 Troubleshooting PSID “MID 128 PSID 47 Particulate Trap Regeneration” page 42 “MID 128 PSID 98 Boost Air System” page 42 “MID 128 PSID 108 Aftertreatment Injection System” page 43 “MID 128 PSID 109 Engine Coolant Temperature Sensor” page 44 SID “MID 128 SID 1/2/3/4/5/6 Unit Injector” page 45 “MID 128 SID 18 Drain Valve, Water Separator” page 46 “MID 128 SID 21 Engine Position Timing Sensor” page 47 “MID 128 SID 22 Engine Speed Sensor” page 48 “MID 128 SID 27 Variable Geometry Turbocharger” page 49 “MID 128 SID 33 Fan Control” page 50 “MID 128 SID 70 Preheater Element page 50 “MID 128 SID 71 Preheater Element page 51 “MID 128 SID 146 EGR Valve page 51 “MID 128 SID 211 5 Volt DC Supply” page 52 “MID 128 SID 230 Idle Validation Switch page 52 “MID 128 SID 232 5 Volt DC Supply to Sensor” page 53 15