Computer device (Renault Kangoo 1)

Connection

1 - Computer power supply.

2 - Weight of the computer.

3 - Mass of sensors.

4 - Power supply for load potentiometer.

5 - Control of the electromagnetic valve for exhaust gas recirculation.

6 - Control of the injection advance corrector.

7 - Needle lift sensor signal.

8 - Engine mode signal.

9 - Control of the preheating system indicator lamp.

10 - Diagnostic line information L.

11 - Air conditioner status.

12 - Vehicle speed signal.

13 - Diagnostic line information K.

14 - Control of pre-heating relay.

15 - Control of the corrector relay.

16 - Fast idle control.

17 - Load lever position signal.

18 - Control of diagnostic indicator lamp.

19 - Air conditioning shutdown control.



20 - Control of the power steering pump relay.

21 - Information about the engine crankshaft speed.

22 - Not used.

23 - Load potentiometer signal.

24 - Air temperature sensor signal.

25 - Coolant texture sensor signal.

Emergency modes

If one of the devices listed below fails, the computer goes into emergency mode, that is, it starts using substitute values to ensure engine operation.

Table 4.9

Interaction with the air conditioner computer

Electrical connection:

• air conditioner computer with the injection computer using a wire. Only the controller operation signal is transmitted via this wire. Based on this signal, the injection system computer learns about the air conditioner being turned on: pin 11;
• injection computer with the air conditioner computer using a wire. This wire transmits signals to allow and prohibit the air conditioner compressor from falling: pin 19.

Compressor activation algorithm

In certain engine operating modes, the injection system computer prohibits the compressor from operating.

When starting the engine

The compressor is blocked from turning on after the engine has started for 3 seconds.

Engine power maintenance algorithm

When the computer detects the "pedal pressed all the way down" position, the air conditioning compressor is switched off for 8 seconds.

Engine stall warning

If the engine crankshaft speed is below 650 rpm, the compressor is switched off. Its operation is resumed when the engine speed exceeds 775 rpm.

Adjusting idle speed and minimum feed (preventing engine stalling)

These adjustments should only be made on a hot engine, after the electric fans have been turned on at least twice.



1. Make sure the fast idle lever is in the off position.

2. Using screw 1, set the engine idle speed to 825 ±25 rpm.

3. Place a 4mm thick spacer between load lever 2 and minimum feed screw 3.

4. Using the minimum feed screw 3, set the engine speed within 1250 ±50 rpm.

5. Remove the 4mm thick gasket, then increase the engine speed to the limit twice.

6. Check the idle speed; if necessary, repeat the idle speed adjustment and check the minimum feed adjustment again.

Attention! Adjustment of idle speed and minimum fuel supply must be done with special care, since this adjustment directly affects the engine operation at idle and during engine braking (engine misfires, delays in exiting idle mode, etc.).

Fast idle

After disconnecting the vacuum tube from the pneumatic drive, install the cable clamp 5 (figure 4.72) at a distance of 2 + 1 mm from the fast idle lever 4.

Note: The fast idle speed is not adjustable directly on the vehicle; the adjustment is carried out on the injection system device maintenance bench.

Checking maximum speed

With the engine warmed up, press the accelerator pedal all the way down; engine speed should be between 4500 and 4700 rpm (adjustment of maximum speed can only be performed on the benches of the Renault Injection Systems Center).

Control

The computer controls the fast idle speed via the pneumatic actuator control solenoid valve (option with or without air conditioning).

Fast idle mode is activated:

• if the coolant temperature is below 10°C when the key is inserted into the ignition switch;

Table 4.10

• if the engine speed has dropped to 650 rpm and the vehicle speed is less than 25 km/h (to make it easier to start moving). Fast idle mode is disabled as soon as the engine speed exceeds 850 rpm.

Note

1. Fast idle mode is enabled:

• the solenoid valve is not controlled;
• the cable is loose, not taut.

2. Nominal idle mode:

• the electromagnetic valve is controlled;
• the rope is taut.

3. As soon as the air conditioner is turned on on the control panel, the fast idle mode is immediately activated.

Pneumatic fast idle drive

1. Install pneumatic actuator 1 on the rear protective bracket of the high-pressure fuel pump 2.

2. Snap the spring clip onto the pneumatic actuator.



3. Install limiter 4 on the cable.

4. Install the cable clamp so that the X dimension is 2 ±1 mm. Tighten the clamp nut.

Pre-heating and post-heating control

The computer controls the preheating and postheating. The computer controls the glow plug relay unit.

1. Setting the key in the ignition switch to position "M" - Preheating

1.1. Variable preheating mode

It is determined by the coolant temperature, battery voltage and altitude (internal computer sensor) when the ignition switch key is set to position "M" (when the preheating indicator lamp lights up).

• Upper preheating threshold (battery voltage less than 9.3 V, altitude above sea level more than 2000 m).
• Lower preheating threshold (battery voltage is more than 10.5 V and sea level is less than 350 m).

1.2. Continuous preheating mode

After the preheating indicator light goes out (variable preheating mode), the glow plugs remain energized for 8 seconds before the engine starts.

2. Starting the engine

During starter operation, all 4 glow plugs are energized.

3. Engine running - Post-heating

3.1 Continuous post-heating mode

After the engine starts, all glow plugs remain energized for 10 seconds.

3.2. Variable post-heating mode

The variable post-heating mode starts after the constant post-heating mode has ended. The duration of the constant activation of all 4 pre-heating plugs depends on:

• coolant temperature;
• engine crankshaft speed;
• loads (fuel injection pump load lever potentiometer).

The variable post-heating mode can be interrupted:

• finally, when the coolant temperature exceeds 60°C;
• for a certain period of time when the computer receives information about the presence of a full load for more than 3 seconds. The mode is restored when returning to idle or to a slight load;
• for a certain time if the battery voltage is more than 16 V; the mode is restored when the battery voltage becomes less than 15V.

In all cases, the total duration of operation of the system in the post-heating mode should not exceed 3 minutes.