The system consists of a computer that receives information:
- from coolant temperature sensor;
- from the air temperature sensor;
- from the engine crankshaft speed sensor;
- from the vehicle speed sensor;
- from load potentiometer;
- from the injection start sensor, the sensor is part of the injector of cylinder No.3 (injector with built-in sensor).
The computer controls:
- high pressure fuel pump;
- altitude corrector (F8Q 630) via relay;
- electromagnetic injection advance valve;
- cold engine starting system (pre-heating plugs and pre-heating and post-heating device);
- exhaust gas recirculation system;
- injection system failure warning light;
- preheating system warning light;
- electromagnetic valve for controlling the pneumatic drive of accelerated idle speed;
- electric Power Steering Pump Relay (if there is one), power is supplied to the electric pump as soon as the engine crankshaft speed exceeds 650 rpm.
The computer also performs self-diagnostics, the results of which can be viewed using the XR25 portable device.
Note
The following can be replaced in the high pressure fuel pump:
- load potentiometer;
- injection advance solenoid valve;
- altitude corrector;
- shut-off electromagnetic valve.
Table 4.6
Table 4.7
Table 4.8
Location of injection system components
Figure 4.62. Location of injection system elements in the engine compartment:
1 - Exhaust gas recirculation solenoid valve;
2 - Air temperature sensor (white connector);
3 - Coolant temperature sensor (white connector);
4 - Diesel engine injection computer;
5 - Fuel filter;
6 - Pre-start and post-heating spark plug relay unit,
7 - TDC sensor;
8 - Fast idle speed solenoid valve;
9 - Shut-off solenoid valve/coded solenoid valve;
10 - Digital injection pump DPC;
11 - Load potentiometer;
12 - Injection advance solenoid valve;
13 - Altitude corrector;
14 - Nozzle with built-in needle lift sensor.
12 - Injection advance solenoid valve;
14 - Nozzle with built-in needle lift sensor;
13 - Altitude corrector;
11 - Load potentiometer;
9 - Shut-off solenoid valve/coded.
4 - Injection computer,
5 - Fuel filter;
6 - Pre-start and post-heating spark plug relay unit;
16 - Inertia switch.
2 - Air temperature sensor;
3 - Coolant temperature sensor.
19 - Exhaust gas recirculation solenoid valve.
20 - Pneumatic valve of the exhaust gas recirculation system.
7 - Engine crankshaft speed sensor.
17 - Diesel injection system failure warning light;
18 - Preheating system indicator light (lights up when the ignition switch key is in position M during the preheating period).
C - Electric power steering pump relay;
H - Altitude Corrector Relay;
L - Injection lock relay;
M - Diesel fuel heating relay.
[The original can be found on the website: Renaultbook.ru]