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Author: samuel

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – PCM Replacement/Programming

Posted on December 3, 2023

Service of the PCM shoul d normally consist of replacement of the PCM. If the diagnostic procedures call for replacing the PCM, peform the following…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Glow Plug System Check

Posted on December 3, 2023

Refer to Glow Plug Controls. Circuit Description The glow plug system is used to assist in providing the heat required to begin combustion during engine…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Nozzle Leak Test

Posted on December 3, 2023

Caution: When testing nozzles, do not place your hands or arms near the tip of the nozzle. The high pressure atomized fuel spray from a…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Fuel Injection System Diagnosis

Posted on December 3, 2023

Always begin diagnosis of the electronic fuel injection system with the On-Board Diagnostic (OBD) System Check before proceeding to any other diagnostics. This will reduce…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Water in Fuel Lamp Circuit Diagnosis

Posted on December 3, 2023

Circuit Description The fuel manager/filter assembly consists of the fuel heater, the water in fuel sensor and a filter. The filter contains the coalescer (the…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Fuel Heater Functional Diagnosis

Posted on December 3, 2023

Circuit Description The fuel manager/filter assembly consists of the fuel heater, the water in fuel sensor and a filter. The filter contains the coalescer (the…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Fuel Tank Leak Check

Posted on December 3, 2023

The diagnosis of fuel odor may be a condition of leaking fuel tank, filler neck or filler cap. A defective filler cap, a plugged or…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Cruise Control Diagnosis

Posted on December 3, 2023

Circuit Description The cruise control multi function lever is wired directly to the PCM. The cruise on/off, set/coast and resume/accel signals are inputs to the…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – Symptoms

Posted on December 3, 2023

Before Using This Section Before using this section, you shou l d have performed the On-Board Diagnostic System Check and determined that : 1. The…

GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – DTC U1192 Loss of VTD (Passlock)/EVO Communication

Posted on December 3, 2023

Circuit Description The PCM monitors the serial data (class II) circuit for communications from the Passlock/EVO controller. If the Passlock/EVO controller is not communicating with…

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  • GM/Detroit 6.5L ENGINE CONTROLS – PCM Replacement/Programming
  • GM/Detroit 6.5L ENGINE CONTROLS – Glow Plug System Check
  • GM/Detroit 6.5L ENGINE CONTROLS – Nozzle Leak Test
  • GM/Detroit 6.5L ENGINE CONTROLS – Fuel Injection System Diagnosis
  • GM/Detroit 6.5L ENGINE CONTROLS – Water in Fuel Lamp Circuit Diagnosis

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