System description
The system includes:
- ECU Bosch ME 7.4.6;
- servo throttle valve (EGAS: Electronic control system for filling engine cylinders with air);
- adsorber;
- adsorber purge solenoid valve;
- absolute pressure sensor;
- two fuel rails with three nozzles on each of them;
- two camshaft phase regulators;
- 6 finger type ignition coils and spark plugs;
- 2 camshaft position sensors;
- 2 upstream oxygen sensors;
- 2 downstream oxygen sensors;
- two catalytic converters, one for each bank of cylinders;
- 2 knock sensors;
- coolant temperature sensor;
- oil level and temperature sensors;
- air temperature sensor;
- accelerator pedal module;
- submersible fuel pump assembly with fuel level transmitter;
- position and speed sensor of the engine crankshaft;
- pressure sensor in the power steering system;
- diagnostic socket.
Rows A and 1 elements corresponds to 3 cyl. engine, located on the side of the electric fans, rows B and 2 elements corresponds to 3 cyl. engine located on the side of the vehicle.
Cylinders No. 1-2-3 are located on the side of the electric fans of the engine cooling system, while cylinder No. 1 is located on the flywheel side; cylinders No. 4-5-6 are located on the passenger side, while cylinder No. 4 is located on the flywheel side.
Note. The injection computer is matched to the given engine model and the vehicle on which it is installed. Therefore, checking the ECU on another car and installing it on the old car is not allowed.
Motorized Throttle Valve
General information
Due to the fact that the servo throttle valve unit does not provide for matching the actual value obtained on the basis of signals from the sensor conductive tracks and the mechanical throttle position, it is necessary to adjust 8 ECU ME7.4.6. When adjusting, the opening of the throttle valve and its reserve position are programmed, and the potentiometer amplifier is balanced. The programmed values are entered 8 in the ECU memory. The stages of programming the extreme positions and storing the programmed values constitute the initialization of the motorized throttle body. In addition, the throttle springs are checked.
Must be done «initial initialization», when you first turn on the ignition of the car; otherwise, the throttle may remain in the reserve position. Initialization occurs automatically offline with the ignition on and only if certain initial conditions are met; Several initialization cycles are possible per ignition switch-on.
Throttle Programming Procedure
Programming must be done correctly at least once during the entire life of the vehicle, when the ignition is first turned on (initial initialization) and every time you replace the ECU or motorized throttle body.
1. Switch on the ignition and wait at least 5 seconds without starting the engine: this will automatically adapt the throttle position.
2. Turn off «ignition».
3. Wait a while before turning the ignition back on so that the ECU can remember the programmed values:
- at least 10 s with a cold engine (coolant temperature below 85°C);
- at least 130 s with a hot engine (coolant temperature is greater than or equal to 90°C).
4. Switch on the ignition, start the engine and let it idle for 1 minute to properly adapt to the air flow through the motorized throttle body.
Note. A malfunction occurs and a command is issued to set the throttle to the reserve position:
- in case of canceling the automatic programming procedure (step 1 above) less than 5 s and in case of failure of step 4;
- if step 4 is not completed.
Programming must be done at reinitialization and every time the ECU or motorized throttle body is replaced. Switch on the ignition, start the engine and let it idle for 1 minute to properly adapt to the air flow through the motorized throttle body.
Servo Throttle Standby Programming
The fallback position is needed to control the throttle position and determine if correction is needed when replacing the motorized throttle body. With the ignition on, before supply voltage is applied to the throttle actuator motor, the signal for the reserve position of the damper comes from both conductive tracks of the sensor and its reliability is calculated by comparing with the values stored in the memory of the computer. If the values differ, the need for adjustment and programming of the reserve position is determined.
Servo throttle spring test, return spring test
Throttle forced return test under the action of return springs is performed by moving the damper from the reserve position in the opening direction and turning off the damper servo power stage. In the event of a malfunction, a command is issued to set the damper to the reserve position. Verification is possible only if all of the following conditions are met:
- there is no irreversible interruption in the supply of fuel;
- the throttle motor is energized;
- no response to type fault «disruption of work»;
- throttle position control activated;
- sufficient battery voltage (between 11 and 15 V);
- the vehicle is not moving;
- crankshaft speed less than or equal to 250 min-1;
- coolant temperature above 6°C;
- the air temperature is above 6°C.
Retract spring check
Checking the forced return of the damper to the reserve position under the action of the retracting spring is carried out by moving the damper from the reserve position in the closing direction and turning off the power stage. In the event of a malfunction, a command is issued to set the damper to the reserve position. Verification is possible only if all the conditions listed in the previous part are met.
Servo Throttle Adjustment
When adjusting, the opening of the throttle valve and its reserve position are programmed, and the potentiometer amplifier is balanced. Tuning is done only once when you first turn on a new ECU or when you replace the motorized throttle. It is possible to perform a new tuning if the ignition has been switched on for more than 30 seconds without starting the engine. When programming the throttle opening position, the throttle moves from the maximum possible minimum opening position to the actual minimum opening position. Throttle valve movement is determined based on the actual value of the throttle position sensor signal. The corresponding value is read by the ECU, then a correction value corresponding to the signal value at the minimum throttle opening is added to it, and stored in the EEPROM.
In any case, if an error occurs during the adjustment, the adjustment procedure is terminated and the damper returns to the standby position.
Switching on signal lamps
Level 2 Malfunction Warning Light
The level 2 fault warning light comes on, indicating that the injection ECU has detected a serious system failure (3rd degree of severity) and issue a command to permanently cut off the fuel supply and reset the ECU. hence. - stop the engine. The injection ECU does not directly control the level 2 fault warning light, it sends a request to the instrument cluster to turn on the warning light via the CAN·multiplex network. who must carry it out.
Alarm lamp for emergency coolant temperature
During normal operation, the engine coolant temperature warning light comes on when the engine overheats (coolant temperature above 118°C). The injection ECU does not directly control the coolant temperature fault warning light, it sends a warning light request over the CAN·multiplex network to the instrument panel, which should fulfill it.
Signal lamp BSD (on-board diagnostic system)
To ensure visual control, the warning light of the on-board diagnostic system (BSD) lights up every time the ignition is turned on. The signal lamp lights up and goes out 3 seconds after starting the engine.
If, during normal operation, the OBD warning light comes on (BSD). this means that a malfunction has been detected that led to the exceeding of the exhaust gas toxicity limits. The switch-on request is only taken into account if the warning lamp is intended to be switched on for the given fault.
Special Fault Cases «Mixture misfires», destructive to the catalytic converter: With this fault, the OBD warning light may flash, when the fault disappears, the blinking of the warning light stops.
The injection ECU does not control the OBD warning light directly, it sends a request via the multiplex CAN network to turn on the warning light to the instrument panel, which should fulfill it.
ECU pin assignment
Connector (A), 32-pin
Connector (IN), 48-pin
Connector (WITH), 48-pin
Replacement of system elements
ECU replacement, programming or reprogramming operations
The system can be programmed or reprogrammed using the RENAULT CLIP diagnostic tool connected to the diagnostic socket.
Connect diagnostic tool (to the network or to the cigarette lighter).
Connect your charger (at (pen) programming the computer, the electric fans of the engine cooling system automatically turn on).
Observe the coolant temperature setpoints entered into the scan tool before (pen) programming.
Every time after programming, reprogramming or replacing the ECU, do the following.
Turn off «ignition».
Start then stop the engine (to initialize the computer) and wait 30 s.
Turn on «ignition» and use the diagnostic tool to perform the following operations:
Give command VP010 «Enter VIN». Deal with the faults found by the diagnostic tool. Delete data from ECU memory.
Program the crankshaft speed sensor and throttle angles (see «Configurations and programming»).
Carry out a road test, then recheck the scan tool.
Attention! It is forbidden to test with an injection computer taken from the spare parts store, as it cannot subsequently be used on another vehicle.
Servo throttle body replacement operation
When replacing the throttle body, it is necessary to program the throttle limits using command RZ005 «Programming».
Attention! Never operate the vehicle without programming the throttle limits.
Attention! After completing the programming operation, do not disconnect the battery within 30 minutes (if you need to perform other work on the car). It is forbidden to use an ECU taken from the spare parts warehouse for testing. since then it can not be installed on any other car.
Configurations and programming
ECU programming
The ECU can be configured automatically based on which sensors and accessories are installed on the vehicle. Automatic configuration begins upon recognition of the presence of a special frame of the multiplex network.
Throttle Programming Procedure
Due to the fact that the motorized throttle valve unit does not provide for matching the actual value obtained from the signals from the sensor conductive tracks and the mechanical throttle position, it is necessary to make a correction in the computer. When adjusting, the opening of the throttle valve and its reserve position are programmed, and the potentiometer amplifier is balanced. The programmed values are entered into the computer memory. The stages of programming the extreme positions and storing the programmed values constitute the initialization of the motorized throttle body. In addition, the throttle springs are checked.
Programming must be done correctly at least once during the entire life of the vehicle, when the ignition is first turned on (initial initialization) and every time you replace the ECU or motorized throttle body.
1. Switch on the ignition and wait at least 5 seconds without starting the engine: this will automatically adapt the throttle position.
2. Turn off -ignition».
3. For the ECU to memorize the programmed values, wait until the ignition is switched on again:
- at least 10 s with a cold engine (coolant temperature below 85°C),
- at least 130 s with a hot engine (coolant temperature is greater than or equal to 90°C).
4. Switch on the ignition, start the engine and let it idle for 1 minute to properly adapt to the air flow through the motorized throttle body.
A malfunction occurs and a command is issued to set the throttle to the reserve position:
- in case of cancellation of the automatic programming procedure (step 1 above) less than 5 s and if step 4 is not carried out.
- if step 4 is not completed.
Programming must be done at reinitialization and every time the ECU or motorized throttle body is replaced. Turn on the ignition. Start the engine and let it idle for 1 minute to properly adapt to the air flow through the motorized throttle body.