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Check the engine management system
The electronic control unit is constantly supplied from the battery through the output "38" protected fuse number 41 (7.5 A) located in the mounting block of the engine compartment. When the switch devices and starter voltage from the battery is supplied to the findings of "25" and "37" of the computer connector and output "7" of the solenoid valve stop the diesel engine on a circuit protected by a fuse number 25 (10 A), are in the assembly block of the car interior . In addition, the enable signal from the immobilizer system via terminal "30" connects to the "masses" conclusion "106" blocks computer connector that leads to the closure of the main circuit relays preheating. When triggered, the relay specified voltage is applied to glow plug for a time, depending on the temperature of the coolant. Permission to start the engine ECU receives through the output "28" on the circuit protected by a fuse number 26 (7.5 A) located in the mounting block of the car. For vehicles with air conditioning with the engine idling output of "8" pad computer connector is connected to the "masses" through the chain of protected fuse number 6 (7.5 A), power is supplied to switch the air conditioner. When triggered, the specified relay turns on the air conditioning compressor and the power supplied to the solenoid valve fast idle speed through the circuit protected by a fuse number 30 (7.5 A). Checks are carried out on the instructions tab. 3.15-3.17.
Table 3.15 Checking supply chain COURT engine CD20 To connect the control panel to the conclusions | Test conditions | The audit, control values | Problem | Conclusion "38" of the computer connector and "mass" | Switch off appliances and starter | U = Uak. Baht. | Broken wire between the battery and the terminal "38" of the computer connector. Blown fuse ?�� 41. Loose connection in the assembly block of the engine compartment | Conclusions "1" connector relays preheating and "mass" | Also | Also | Broken wire between terminal "1" preheating relay and the battery. Blown fuse number 41 | Conclusion "2" connector relays preheating and "mass" | " | " | Faulty relays preheating | Output "106" of the computer connector and "mass" | " | " | Broken wire between terminal "2" connector relays preheating and output "106" of the computer connector | Conclusion "3" connector relays preheating and "mass" | " | " | Broken wire between the battery and the terminal "3" connector relays preheating. Blown fuse "a" in the assembly block of the engine compartment. Loose connection in the assembly block of the engine compartment | The output "1" switch connector and starter equipment and "mass" | " | " | Broken wire between the battery and the terminal "1" switch connector and starter units. Blown fuse ?�i?� in the assembly block of the engine compartment. Loose connection in the assembly block of the engine compartment | Conclusions "3" connector relays electromagnetic compressor clutch, and "mass" | " | " | Broken wire between the battery and the terminal "3" connector relays electromagnetic compressor clutch. Blown fuse number 30 in the mounting block of the engine compartment. Blown fuse "e" in the assembly block of the engine compartment. Loose connection in the assembly block of the engine compartment | The output "1" connector immobilizer and "mass" | " | " | Broken wire between the battery and the terminal "1" of the immobilizer connector. Blown fuse number 24 in the mounting block of the car. Loose connection of wires in the assembly block car interior | The output of "2" and "3" switch connector and starter equipment and "mass" | Turn the starter switch instruments and to the "ACC", then to ?�ON?� position | " | Faulty equipment and starter switch | Conclusions "25", "37" of the computer connector and "mass" | Turn the switch devices and a starter in ?�ON?� position | " | Broken wire between the switch devices and the starter and the conclusions of "25", "37" of the computer connector. Blown fuse number 25 in the mounting block of the car. Loose connection of wires in the assembly block car interior | Conclusion "2" connector immobilizer and "mass" | Also | " | Faulty immobilizer | Conclusion "30" of the computer connector and "mass" | " | " | Broken wire between terminal "2" of the immobilizer and the terminal "30" of the computer connector | Conclusion "7" plug and pump "mass" | " | " | Broken wire between the switch devices and the starter and stop solenoid valve diesel engine. Blown fuse number 25 in the mounting block of the car. Loose connection of wires in the assembly block car interior | Conclusion "5" connector relays preheating and "mass" | " | " | Faulty relays preheating | Power cord glow and "mass" | " | " | Broken wire connecting the terminals "5" preheating relay and glow | Connector "106" computer and "mass" | Turn the switch devices and a starter in ?�ON?� position | U = 0 | Faulty ECU | Conclusion "6" switch connector and starter equipment and "mass" | Turn the starter switch instruments and to position ?�ST?� | U = Uak. Baht. | Faulty equipment and starter switch | Conclusion "28" of the computer connector and "mass" | Also | Also | Broken wire between terminal "28" of the computer connector and terminal "5" switch connector and starter units. Blown fuse number 26 in the mounting block of the car. Loose connection of wires in the assembly block car interior | The output "1" connector relays electromagnetic compressor clutch, and "mass" | Engine idling, air conditioning is turned off | " | Broken wire between the switch devices and a starter and terminal "1" connector relays electromagnetic compressor clutch. Blown fuse number 6 in the mounting block of the car. Loose connection of wires in the assembly block car interior | Conclusion "2" connector relays electromagnetic compressor clutch, and "mass" | Also | " | Faulty relays electromagnetic compressor clutch | Conclusion "8" of the computer connector and "mass" | " | " | Broken wire between relays electromagnetic compressor clutch and ECU. Faulty refrigerant pressure sensor | Conclusion "5" connector relays electromagnetic compressor clutch, and "mass" | Engine idling, air conditioning included | " | Faulty relays electromagnetic compressor clutch | The output "1" solenoid valve connector fast idle speed and "mass" | Also | " | Broken wire between terminal "1" solenoid valve connector fast idle speed and terminal "5" relays electromagnetic compressor clutch |
Table 3.16 Check the resistance sensors and solenoid valves COURT Check item system | Conclusions or the connection point of the device | Control values, the check result | Problem | Engine speed sensor | Conclusions "17", "23" and "36" of the computer connector | R = 1,6 Ohm | Faulty speed sensor engine. Broken wire between terminal "4" sensor connector and pin "23", "36" of the computer connector. Broken wire between terminal "5" sensor connector and terminal "17" of the computer connector | Coolant temperature | Conclusions "15", "23" and "36" of the computer connector | The resistance value at a temperature: 15 ?� C 11,5kOmpri; 5.6 ohms at 0 ?� C; 3,7kOmpri 10 ?� C; 1.2 ohms at 40 ?� C | Faulty coolant temperature sensor. Broken wire between terminal "1" sensor connector and terminal "13" of the computer connector. Broken wire between terminal "2" sensor connector and pin "23" and "36" of the computer connector | The solenoid valve control fuel injection timing | Output "108" of the computer connector and the housing of the solenoid valve | R = 0.5 ohms | Defective solenoid valve timing of fuel injection. Loose connection in the bundle of wires | Housing solenoid valve fuel injection timing and the "mass" | R = <0,5 Ohm | The unreliability of the contact at the connection point "weight" of the valve and pump | Solenoid valve fast idle speed | Conclusions "1" and "2" valve connector | R = 39 ohms | Defective solenoid valve fast idle speed | Conclusion "2" valve connector | R = <0,5 Ohm | - | Presence sensor key in the lock switch instruments and starter | Conclusions "1" and "2" sensor connector | The key is not inserted into the lock - R = infinity. The key lock is set to -R <0,5 Ohm | Faulty sensor presence key in the lock switch instruments and starter | Speed sensor | Conclusions "1" and "2" sensor connector | R = 250 ohms | Faulty vehicle speed sensor | Connection points weight ECU | Conclusion "26", "39", "101" and "195" of the computer connector and "mass" | R <0,5 Ohm | Wire break between terminals "26", "39", "101" and "106" and "weight" |
Table 3.17 Checking the supply chain, or the passage of signals from the sensors and solenoid valves COURT Check item system | Conclusions or the connection point of the device | Control values, the check result | Problem | Coolant temperature | Conclusions "15", "23" and "36" ECU * | 5B U = | Faulty ECU | Engine speed sensor | Conclusions "17", "23" and "36" ECU ** | The voltage change from 0 to 5, depending on the engine speed | Faulty speed sensor Engine | A vehicle speed sensor (vehicle motion) | Conclusions "1" and "2" sensor ** | The voltage change from 0 to 5, depending on the vehicle speed | Faulty vehicle speed sensor | The solenoid valve control fuel injection timing | Conclusion "6" pump connector and "mass" *** | U = 12 | Faulty ECU |
* When off switch devices and starter. ** With working engine. *** At running the engine is cold.
| Fig. 3.43. The numbering of the conclusions the connectors computer connector engine CD20 (rear view)
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NOTE to Table. 3.16 Checks are carried out on the findings of the connectors computer connector (see. Fig. 3.43), the connector must be disconnected from the computer. During the measurement plugs Do not unplug the unit under test. |
NOTE to Table. 3.17 Checks are carried out on the findings of the connectors ECU (see. Fig. 3.43) when docked connectors. To facilitate the inspections necessary to use the adapter, connected in series between the computer and plug connector. |
WARNINGS For checking and adjusting the court does not get injured and do not damage the components of the system, observe the following rules: - Do not operate the engine if the wires are loose clamps on the battery terminals; - Do not disconnect the wires from the battery terminals with the engine running; - Disconnect the battery from the vehicle when it is charged by car from the outside power source; - Do not start the engine with an external source voltage of more than 12; - Do not disconnect the computer connector with the ignition on; - Before connecting the plug connectors, make sure there is no damage or oxidation on the contacts male and female parts, and connectors are properly connected; - Make sure there is a rubber seal pad and fixing springs; - Replace damaged spring; - Before carrying out work on the vehicle using electric welding, including spot, disconnect the computer. - Remove the control unit if the vehicle will be exposed to temperatures above 80 ?� C (e.g., freshly painted vehicle before placing in an oven); - Before checking cylinder compression disconnect connector (gray on the pump) of the solenoid valve stop diesel; - Do not check the wires and connection control lamp; - Do not check "to spark" the presence of voltage in the circuit; - Disconnect the battery before measuring the electrical resistance elements of the vehicle; If the vehicle is equipped with a car radio code before disconnecting the battery note the activation code car. When checking Never connect terminals extension wires to the terminals of the control device connector. It is necessary to move the protective cover and attach the pad terminals on the input side wires in the connector or using a special terminal block. In the latter case, the conclusions of the terminal block marking must correspond to the identification of the computer connector pins. |
Preliminary checks Before checking COURT perform the work described below, and eliminate identified with the problem: - Ensure normal operation of the engine start-up circuit: battery, power wires and the starter; - Ensure that there is sufficient fuel of appropriate quality, the correct installation of the fuel filter and that the filter is not clogged; - Check the tightness of the fuel vapor recirculation systems and crankcase gases, as well as the state of the hose system (not be pinched); - Check the air supply system: pipes and gaskets must be tight, tight collars, the filter element must be clean; exhaust gas recirculation should be OK, pipelines are sealed; - Check the condition of the circuit preheating: integrity and compliance with the recommended wire specifications; - The engine fuel supply system must be tight, leaks in pipes and fittings are not allowed; - Check tightness of the exhaust system; Check the condition and adjustment of a cable drive fuel management: move from stop to stop and ease of movement; stroke fuel control lever depending on the position of the pedal; - Assess the technical condition of the engine: compression, setting the initial timing of fuel injection, sealed cylinder head gasket, the state of the high pressure pump, etc.
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