The system consists of a computer that receives information:
- from the coolant temperature sensor;
- from the air temperature sensor;
- from the engine crankshaft speed sensor;
- from the vehicle speed sensor;
- from the load potentiometer;
- from the injection start sensor, the sensor is part of the injector of cylinder No. 3 (nozzle with built-in sensor).
The computer controls:
- high pressure fuel pump;
- height corrector (F8Q 630) through a relay;
- injection advance solenoid valve;
- cold start system (glow plugs and preheater and afterheater);
- exhaust gas recirculation system;
- signal lamp for failure of the injection system;
- signal lamp of the preheating system;
- solenoid valve for controlling the fast idle pneumatic actuator;
- power steering electric pump relay (if he is), power is supplied to the electric pump as soon as the engine speed exceeds 650 rpm.
The computer also performs self-diagnostics, the results of which can be viewed using the portable XR25 instrument.
Note
On the high pressure fuel pump, you can replace:
- load potentiometer;
- injection advance solenoid valve;
- height corrector;
- isolation solenoid valve.
Table 4.6
Table 4.7
Table 4.8
Location of injection system elements
Pic. 4.62. The location of the elements of the injection system in the engine compartment:
1 - Solenoid valve of the exhaust gas recirculation system;
2 - Air temperature sensor (white connector);
3 - Coolant temperature sensor (white connector);
4 - Diesel engine injection computer;
5 - Fuel filter;
6 - Relay block for pre-heating and post-heating plugs,
7 - TDC sensor;
8 - Solenoid valve accelerated idling;
9 - Shut-off solenoid valve / coded solenoid valve;
10 - Digital injection pump DPC;
11 - Load potentiometer;
12 - Solenoid injection advance valve;
13 - High-altitude corrector;
14 - Nozzle with built-in needle lift sensor.
12 - Solenoid injection advance valve;
14 - Nozzle with built-in needle lift sensor;
13 - High-altitude corrector;
11 - Load potentiometer;
9 - Shut-off solenoid valve / coded.
4 - Injection computer,
5 - Fuel filter;
6 - Relay block for pre-heating and subsequent heating plugs;
16 - Inertial switch.
2 - Air temperature sensor;
3 - Coolant temperature sensor.
19 - Solenoid valve for the exhaust gas recirculation system.
20 - Pneumatic valve of the exhaust gas recirculation system.
7 - Engine crankshaft speed sensor.
17 - Signal lamp for failure of the diesel engine injection system;
18 - Signal lamp for preheating system (lights up when the key is in the ignition switch in position M for the preheating time).
C - Power steering electric pump relay;
H - Relay high-altitude corrector;
L - Injection blocking relay;
M - Relay for heating diesel fuel.