2001 Mitsubishi Pajero (NM) Service & Repair Manual

DIESEL FUEL <4D5-STEP III> Click on the applicable bookmark to selected the required model year.

13E-1 DIESEL FUEL <4D5-STEP III> CONTENTS GENERAL 2 ................................. Outline of Change 2 ............................ GENERAL INFORMATION 2 ................... SERVICE SPECIFICATIONS 4 ................. SEALANT 4 .................................. SPECIAL TOOLS 5 ........................... TROUBLESHOOTING 6 ....................... ON-VEHICLE SERVICE 55 .................... Injection Nozzle Check and Adjustment 55 ......... Injection Timing Check and Adjustment 55 ......... Idle Speed Check and Adjustment 55 ............. Accelerator Pedal Position Sensor (APS) Adjustment 56 ................................. Control Relay Continuity Check 57 ................ Accelerator Pedal Position Sensor (APS) Check 57 ...................................... Idle Switch Check 58 ............................ Boost Air Temperature Sensor (Intake Air Temperature Sensor) Check 58 .................. Engine Coolant Temperature Sensor Check 59 ..... Evacuation of Water from Fuel Filter 59 ............ Fuel Filter Cartridge Replacement 60 .............. Evacuation of Air from Fuel Line 60 ............... EGR Valve Position Sensor Check 60 ............. Fuel Injection Pump Check 61 .................... Throttle Solenoid Valve Check 62 ................. Throttle Actuator Check 63 ...................... Variable Geometry Solenoid Valve Check 63 ....... EGR Control Solenoid Valve Check 63 ............ FUEL INJECTION NOZZLE 64 ................. FUEL INJECTION PUMP 64 ................... CRANKSHAFT POSITION SENSOR 66 ......... ENGINE-ECU 66 .............................

DIESEL FUEL <4D5-step III>- General/General Information 13E-2 GENERAL OUTLINE OF CHANGE An electronically-controlled injection pump has been added in order to comply with Regulation STEP III. Due to this, the following service procedures have been added. GENERAL INFORMATION The electronically-controlled fuel injection system consists of sensors which detect the condition of the diesel engine, an engine-ECU which controls the system based on signals from these sensors, and actuators which operate according to control commands from the engine-ECU. The engine-ECU carries out operations such as fuel injection rate control, fuel injection timing control and idle up control. In addition, the engine-ECU is equipped with several self-diagnosis functions which make troubleshooting easier in the event that a problem develops. FUEL INJECTION RATE CONTROL The fuel injection completion timing is controlled by means of a solenoid-type spill valve to ensure that the optimum amount of fuel is supplied to the engine in accordance with gradual changes in the engine running condition. Before fuel injection starts, the solenoid-type spill valve is on (energized), so that the valve is closed. As the plunger turns and rises, fuel is sent out under pressure, and when the fuel flow rate reaches the target value for fuel injection, the solenoid-type spill valve turns off. When the solenoid-type spill valve turns off, the fuel under high pressure inside the plunger is leaked out into the pump chamber and fuel injection is completed. FUEL INJECTION TIMING CONTROL The position of the injection pump timer piston is controlled so that fuel injection is carried out at the optimum timing in accordance with the engine running condition. The timer piston position is determined by duty control of the timing control solenoid valve which is located in the line between the high-pressure chamber and the low-pressure chamber of the timer piston. The fuel injection timing is advanced by increasing the control duty of the timing control solenoid valve. IDLE SPEED CONTROL Controlling the fuel injection rate in accordance with the engine running condition maintains the idle speed at the optimum condition. SELF-DIAGNOSIS FUNCTION D When an abnormality is detected in any of the sensors or actuators, the engine warning lamp illuminates to warn the driver. D When an abnormality is detected in any of the sensors or actuators, a diagnosis code number corresponding to the problem which occurred is output. D The RAM data relating to the sensors and actuators which is stored in the engine-ECU can be read using the MUT-II. In addition, the actuators can be force-driven under certain conditions. OTHER CONTROL FUNCTIONS 1. Power Supply Control When the ignition switch is turned to ON, the relay turns on and power is supplied to components such as the timing control solenoid valve. 2. Intake Air Throttle Control When the engine-ECU detects an abnormality in any of the sensors or actuators, the throttle valve is half opened to restrict the amount of intake air in order to prevent the vehicle from running away. 3. A/C Relay Control Turns the compressor clutch of the A/C ON and OFF 4. Condenser Fan Motor Relay Control Controls the condenser fan motor relay based on the A/C switch, engine coolant temperature and vehicle speed input signals. 5. Glow Control Refer to GROUP 16. 6. EGR Control Refer to GROUP 17.

DIESEL FUEL <4D5-step III>- General Information 13E-3 CONTROL SYSTEM DIAGRAM L1. Pump speed sensor L2. Crank angle sensor L3. Engine coolant temperature sensor L4. Boost pressure sensor L5. Fuel temperature sensor L6. Boost air temperature sensor L7. Control sleeve position sensor L8. Timer piston position sensor L9. EGR valve position sensor L10. Variable geometry control pressure sensor D Accelerator pedal position sensor (main) D Accelerator pedal position sensor (sub) D Idle switch D Power supply D Ignition switch-IG D Ignition switch-ST D Vehicle speed sensor D A/C switch D A/C relay switch D Injection volume adjusting ROM D Barometric pressure sensor (ECU built-in) l1. GE actuator (electronic governor) l2. Timing control valve l3. EGR control solenoid valve No. 1 l4. EGR control solenoid valve No. 2 l5. Throttle solenoid valve l6. Fuel cut solenoid valve l7. Variable geometry solenoid valve D Control relay D A/C relay D Condenser fan relay D Glow indicator lamp D Glow plug relay D Engine warning lamp D Diagnosis output Engine- ECU L8 Timer piston position sensor L2 Crank angle sensor L9 EGR valve position sensor L10 Variable geometry control pressure sensor L6 Boost air temperature sensor L4 Boost pressure sensor L3 Engine coolant temperature sensor L7 Control sleeve position sensor l7 Variable geometry solenoid valve l3 EGR control solenoid valve No. 1 l1 GE actuator l5 Throttle solenoid valve l6 Fuel cut solenoid valve Vacuum pump Alternator To variable geometry actuator l2 Timing control valve Catalytic converter Variable geometry actuator Variable geometry turbocharger Throttle actuator EGR valve To variable geometry solenoid valve L1 Pump speed sensor L5 Fuel temperature sensor l4 EGR control solenoid valve No. 2

DIESEL FUEL <4D5-step III>- Service Specifications/Sealant 13E-4 SERVICE SPECIFICATIONS Item Standard value Fuel injection initial pressure kPa 14,710 - 15,490 Accelerator pedal position sensor reference voltage V 0.985 - 1.085 Accelerator pedal position sensor resistance kΩ 3.5 - 6.5 Boost air temperature sensor (Intake air temperature ) it kΩ When the temperature is 20_C 2.3 - 3.0 sensor) resistance kΩ When the temperature is 80_C 0.30 - 0.42 Engine coolant temperature sensor resistance kΩ When the temperature is 20_C 2.1 - 2.7 When the temperature is 80_C 0.26 - 0.36 Fuel cut solenoid valve resistance Ω 6.8 - 9.2 Timing control valve resistance Ω 10.8 - 11.2 Timer piston position sensor resistance Ω Connector terminals No. 1 - No. 2 160 - 168 Connector terminals No. 1 - No. 3 80 - 84 Connector terminals No. 2 - No. 3 80 - 84 Control sleeve position sensor resistance Ω Connector terminals No. 4 - No. 12 11.2 - 12.4 Connector terminals No. 4 - No. 8 5.6 - 6.2 Connector terminals No. 8 - No. 12 5.6 - 6.2 GE actuator (electronic governor) resistance Ω Connector terminals No. 6 - No. 10 0.64 - 0.72 Fuel temperature sensor resistance kΩ Connector terminals No. 7 - No. 11 1.4 - 2.6 Pump speed sensor resistance kΩ 1.36 - 1.84 Throttle solenoid valve resistance Ω 36 - 44 SEALANT Item Specified sealant Engine coolant temperature sensor 3M Nut Locking Part No. 4171 or equivalent

2001 Mitsubishi Pajero (NM) Service & Repair Manual

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