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 starting at cold ambient temperatures. The glow plugs are heated before and during cranking, as well as during the engine operation. The PCM controls the glow plug ON times by… Read More »
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 nozzle has sufficient penetrating power to puncture flesh and destroy tissue and may result in blood poisoning. The nozzle tip should always be enclosed in a receptacle, preferably transparent, to… Read More »
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 diagnosis time and prevent unnecessary replacement of parts. The On-Board Diagnostic (OBD) System Check will give direction to further diagnostics, such, as Engine Cranks But Will Not Run or a… Read More »
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 device that combines small droplets of water into larger ones) and the filter/separator. A fuel lift pump delivers diesel fuel from the tank to the fuel filter. As fuel enters… Read More »
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 device that combines small droplets of water into larger ones) and the filter/separator. A fuel lift pump delivers diesel fuel from the tank to the fuel filter. As fuel enters… Read More »
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 pinched vent pipe can cause a collapsed fuel tank. Loose mounting straps or foreign material in tank may be the cause of a rattle at the fuel tank. Leak Check… Read More »
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 fuel control portion of the PCM. These inputs allow the PCM to control and hold a requested speed. The cruise can be disengaged at any time by applying the brakes.… Read More »
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 control module and the malfunction indicator lamp (MIL) are operating correctly. 2. There are no Diagnostic Trouble Codes (DTCs) stored, or a DTC exists but without a MIL. Several of… Read More »
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 the PCM this DTC will set. Conditions’for Setting the DTC No serial data (class II) from Passlock/EVO controller to the PCM. Action Taken When the DTC Sets This DTC will… Read More »
Circuit Description The PCM monitors the serial data (class II) circuit for communications from the Automatic Transfer Case (ATC) controller. If the ATC controller is not communicating with the PCM this DTC will set. Conditions for Setting the DTC No serial data (class II) from ATC controller to the PCM. Action Taken When the DTC… Read More »