- Whether there is an ignition spark at all is found out by simply checking the voltage.
- The current supply to the ignition / injection system is carried out through fuses 28, 29, 32 or 34 (depending on engine model). If the ignition fails, check these fuses (chapter Electrical equipment).
- Careful visual inspection often reveals the most common sources of faults (wires, connectors, voltage breakdowns).
- Only then check the coil one by one (And) ignition, Hall sensor, or engine speed sensor, or ignition timing sensor.
- If all this was unsuccessful, have the workshop interrogate the computer.
Turn off the ignition by removing the connector on the final stages.
In a 1.6L four-cylinder engine connector (2) disconnected at the final stage (3) next to the ignition coil (1).
In the four-cylinder turbo engine and in the six-cylinder engine, both connectors are disconnected (arrows) at the end stage.
Is there ignition voltage?
1. 74 kW engine: remove one of the wires on the spark plug, unscrew the spark plug.
2. Reconnect the high voltage wire to the spark plug and place it on the engine block so that it makes good contact with the block. Even better, to ensure conductivity, connect the threaded part of the spark plug to the engine with an auxiliary starting wire.
3. Have an assistant turn the engine over with the starter.
4. If powerful sparks jump on the electrodes of the spark plug, then there is ignition voltage, i.e. the ignition system is working. But the basic adjustment of the distributor may be incorrect.
5. 92 kW motor: in principle the same procedure as with a 74 kW motor, but needs to be checked (to make sure both coils are working) candles of the 1st and 2nd cylinders.
6. Leave candles of the 3rd and 4th cylinders installed.
7. 110 kW four-cylinder engine: unscrew the ignition coil, unscrew the spark plug.
8. Connect the coil and spark plug again and fix it on the engine in such a way that the spark plug has contact with the mass, and it could not be shaken off by the movement of the engine. This is achieved, for example, as follows: the threaded part of the spark plug is connected to the engine, providing conductivity, through the terminal of the auxiliary wire to start it.
9. Otherwise, the same steps as for the 74 kW engine, if necessary, repeat the same on the remaining cylinders.
10. Six-cylinder engines: In principle the same procedure as with a 74 kW engine, but you need to check (to make sure all three coils are working) candles 1, 2 and 3 cylinders.
11. For all engines: if there is no spark, then try again with a spark plug of another cylinder. If there are still no sparks, then check the entire ignition system.
Here it is checked whether a spark appears at all in the ignition system. To be safe, the spark plug must be secured to the engine with a starter wire to ensure conduction. It is not shown here for the sake of clarity.
On the removed connector (2) checked against mass (3), whether voltage is applied to the final stage (1).
Open ignition distributor (here is a four-cylinder engine)
- 1 - Hall sensor;
- 2 - diaphragm rotor;
- 3 - Hall sensor connector.
1.6L four-cylinder ignition coil provided with correct terminal designations
Visual inspection of the ignition system
1. All wires and connector pins are firmly connected to the coil (am) ignition, final stage, ignition / injection control unit and to the distributor (74 kW)?
2. Has one pin moved in the multi-pin connectors?
3. Are there obvious damages on the wires?
4. Is the sealing compound pressed into the ignition coil? Perhaps she is faulty due to this?
5. Are there cracks or burn marks on the ignition coil housing from flashing sparks?
6. In addition, check that the high voltage wires are firmly fixed and that there is no damage to the insulation. Modern ignition systems are more sensitive to jumping sparks and creeping currents due to high ignition voltages.
7. Is there any damage on the ignition distributor cap (74 kW)? Pay special attention to the inside.
8. Are all parts of the ignition system clean and dry? Wet dirt contributes to voltage breakdowns.
Tip: For the following measurements, pay attention to the fact that measuring and control devices should only be connected and disconnected when the ignition is switched off. If the engine is repeatedly turned by the starter without starting for checking and taking measurements, then you must first disconnect the wire connectors on the injection valves.
Is the voltage supply to the ignition system OK?
Along with a complete failure of the ignition system due to lack of voltage, its insufficient supply can also cause significant disturbances in the system!
1. Are all fuses OK?
2. 74 kW engine: Disconnect the connector on the final power stage next to the ignition coil.
3. Connect a meter to the disconnected connector between pin 1 (terminal 15) and pin 3 (weight).
4. Turn on the ignition.
5. The meter should show a minimum of 11.5 V.
6. If it did not show the presence of voltage at all or is too low, then the defect lies in the wire to the ignition switch.
7. 92 kW engine: remove the cylinder head cover, disconnect the connector on the final power stage on the ignition coil pack.
8. Connect a meter to the disconnected black/blue wire contact connector (it's average) and mass.
9. Turn on the ignition.
10. The device should show a minimum of 11.5 V.
11. If it did not show the presence of voltage at all or is too low, then the defect lies in the wire to the ignition switch.
12. Four-cylinder 110 kW engine: remove the cylinder head cover, disconnect the connector on one of the ignition coils.
13. Connect a meter to the disconnected black/blue wire terminal and to the brown/yellow wire terminal (weight). These are slots 2 and 3.
14. Turn on the ignition.
15. The device should show a minimum of 11.5 V.
16. If it did not show the presence of voltage at all or is too low, then the defect lies in the wire to the ignition switch.
17. Six-cylinder engine: disconnect the white connector on the left side of the rear wall of the engine compartment (voltage supply to the ignition coils), connect a meter in turn between each of the three inputs of terminal 15 (at the top of the socket) and mass.
18. Turn on the ignition.
19. The device should show a minimum of 11.5 V.
20. If it did not show the presence of voltage at all or is too low, then the defect lies in the wire to the ignition switch.
21. For all engines: measure against the mass duration -+ on the control unit (red wire on 16-pin connector). Rated value: battery voltage.
22. The same measurement on the black/white wire on the 16-pole connector of the control unit with the ignition on.
23. There, too, the device should show a minimum of 11.5 V.
Sources of faults
- Faulty ignition switch (chapter Tools and devices).
- No continuity in wires between ignition switch/central switching unit and central switching unit/coil (ami) ignition or central switching unit/control unit. Check the wires and connectors according to the wiring diagram given in the manual.
Checking the ignition coil
Four-cylinder engine 74 kW
1. A visual inspection of the ignition coil has already been carried out.
2. For resistance check, having switched off ignition, disconnect all wires on the ignition coil. We carry out measurements of the primary and secondary windings of the coil.
3. Take measurements by connecting an accurate ohmmeter between the ignition coil terminals 1/- and 15/+.
4. Rated value: 0.5-1.5 ohm.
5. The next measurement is made between terminal 15 and 4 (4 = thick high voltage main wire socket).
6. The device should show 5-9 kOhm.
7. If the named sizes are not received, replace the ignition coil.
8. With these measurements, it is not possible to determine a short circuit between the windings. If, despite good measurement results, suspicion still falls on the ignition coil, then you should check the dismantled coil in a workshop for repairing automotive electrical equipment.
Checking the final power stage
Four-cylinder engine 74 kW
1. Tuning check: Disconnect the connectors on the final power stage next to the ignition coil.
2. Connect the meter to the removed connector between pin 2 (setting) and pin 3 (weight). Turn the engine over with the starter. The meter should show at least 2 V.
3. Check the voltage supply to the ignition system as already described.
4. Check the ignition coil.
5. If there is no spark in the ignition system, although after carrying out the three named checks no defects have been detected, the source of the malfunction must be in the final power stage. In this case, replace the final stage and the ignition coil together.
Hall sensor test
Four-cylinder engine 74 kW
1. Disconnect all connectors on the injection valves.
2. Disconnect the connector on the final power stage next to the ignition coil.
3. Function test: Bend back the rubber tip on the connected Hall sensor connector (on the side of the distributor - hard to reach) so that the contacts are accessible for measurement from behind.
4. Connect the LED indicator lamp to terminal 1 (green/white) wire and 2 (green/grey wire).
5. Have your assistant turn the engine over with the starter: the LED should flash, in which case the Hall sensor and the wire to it are in order.
6. If it does not flash, then check the supply wire: disconnect the connector from the Hall sensor, connect a voltmeter to terminal 1 (green/white wire) and to terminal 3 (green/purple wire) connector.
7. Turn on the ignition.
8. Look at the meter: it should show 4.5-5.5 V.
9. Now connect a voltmeter to terminal 2 (green/grey wire) and to terminal 3 (green/purple wire) connector.
10. Turn on the ignition. Look at the meter: it should show 4.3-5.2 V.
11. Result: If the LED indicator lamp does not flash, although the voltage readings are correct, the Hall sensor is faulty.
12. Voltage readings are not OK: no continuity in the connecting wire of the control unit.
Final power stage (2) The ignition coils for the 1.8 liter turbo engine with a power of 110 kW are located on the air filter housing on the right in the engine compartment.
The figures show the pin assignment of the four-pole connector («3» On the photo) and a five-pole connector («1» On the photo).
In a four-cylinder engine with a displacement of 1.8 liters, the Hall sensor is located on the left front of the engine. Seen here:
- 1 - Hall sensor body;
- 2 - connector.
In a six-cylinder engine, a Hall effect sensor (1) located on the back of the left cylinder head (2).
Checking ignition coils and final power stage
Engine 92 kW
1. Carry out a visual check as described above.
2. Check the voltage supply as described above.
3. Disconnect all connectors on the injection valves.
4. Check input signals: disconnect ignition coil/power final stage connectors. Connect a diode test lamp to one of the outer pins of the connector and measure against ground.
5. When the engine is cranked by the starter, the lamp should flicker slowly.
6. Take the same measurement on the opposite pin of the connector. There, the lamp should also blink slowly.
7. If the diode control device does not flash: a defect in the supply wire, the control unit or in one of the sensors of the control unit. Replace the entire structural assembly.
8. All measurements OK, but no ignition spark: Faulty ignition coils/power final stage.
Checking ignition coils
Four-cylinder engine 110 kW
1. Disconnect all connectors on the injection valves.
2. Check ignition voltage first (described above).
3. If there is no spark in any spark plug, check the voltage supply to the ignition system (as described).
4. If there is no spark in one spark plug, swap the coils: if the defect moves with the coil, then the cause is in this coil.
5. To be sure, swap more spark plugs to rule out the source of the problem.
6. If swapping the coils does not work, then disconnect the connector on the ignition coil of the idle cylinder and measure the voltage at the connector.
7. Connect test lead to both outer pins of ignition coil 3-pin connector.
8. Turn on the ignition, the voltmeter should show 12 V. If there is no voltage, then look for a defect in the wire to plus and minus.
9. Turn off the ignition.
10. Pulse test: Connect a voltage presence indicator to pins 2 and 3 of the connector.
11. Have your assistant actuate the starter.
12. The LED should flicker.
13. If the diode voltage indicator does not blink: the supply wire, the final power stage, the control unit or one of the sensors of the control unit are faulty.
14. Turn off the ignition.
Checking the final power stage
Four-cylinder engine 110 kW
1. Disconnect the connectors on all injection valves.
2. Disconnect the four-pole connector on the final power stage (under the cover on the air filter housing).
3. Connect one wire of the LED voltage indicator to ground.
4. Test 1: Apply the free wire of the voltage indicator alternately to the terminals of the final power stage of pin 1, 2, 3 and 4.
5. Each time, your assistant scrolls the engine with the starter.
6. The voltage LED should flicker on all four measurements, in which case the final power stage output to the ignition coils is OK.
7. Reconnect the connector.
8. Disconnect the five-pole connector on the final power stage.
9. Test 2: This time, connect the free wire of the voltage indicator to the pins of the disconnected connector 1, 2, 4 and 5, while your assistant cranks the engine over with the starter each time.
10. The voltage LED should flicker on all four pins, in which case the final power stage input signal is OK.
11. Check 3: Check if the ground connection is good at pin 3 of the five-pole connector.
12. Result: If, with a working ground connection, the input signal is OK, but there is no output signal, then the final power stage is faulty.
13. If there is no input signal at all, then the cause of the malfunction is in the control unit (or in its sensors) or in the lead wire.
Hall sensor test
1.8L four-cylinder engine and six-cylinder engine
1. Disconnect all connectors on the injection valves.
2. Bend back the rubber lug on the back of the Hall sensor connector (connector remains connected).
3. Check with voltage LED if there is voltage between terminal 1 and 3 of the connector (on the connector, the terminals are marked) with the ignition on (min 4 V).
4. If not, check the lead wire.
5. Connect a voltage indicator LED between terminal 2 and 3.
6. Have an assistant turn the engine over with the starter.
7. The voltage LED should blink slowly - the Hall sensor is OK.
Final power stage (2) ignition coils in a six-cylinder engine is located on the air filter housing on the right in the engine compartment.
The figures show the pin assignment of the three-pole connector («1» On the photo) and a four-pole connector («3» On the photo).
When electrically checking the ignition coil pack (six-cylinder engine) measurements are carried out, firstly, on opposite sockets of the high-voltage wire, and secondly, on the three-pole connector of the final power stage at the rear left on the wall of the engine compartment. The mounting position is shown in the photo. The location of the connectors in the figure.
Pin connectors at the rear in the middle of the engine compartment of the six-cylinder engine
- 1 - knock sensor II (blue);
- 2 - heating and signal lambda probes (probe left, black);
- 3 - ignition coils (lead wire, white);
- 4 - ignition timing sensor (black);
- 5 - engine speed sensor (grey).
The location of the contacts of the connectors of the engine speed sensor and the ignition timing sensor.
Checking the ignition coil
Six-cylinder engine
1. A visual inspection of the ignition coils has already been carried out.
2. Disconnect all high voltage wires on coils to test resistance. We take measurements on the secondary winding of the coil.
3. Measure with an accurate ohmmeter between the sockets of the ignition wires of the 1st and 6th cylinders (1st coil). Rated value: 9-14 kOhm.
4. Repeat the same measurement between the sockets of the ignition wires of the 2nd and 4th cylinders (2nd coil), as well as between the sockets of the ignition wires of the 3rd and 5th cylinders (3rd coil).
5. If everything is in order, then the secondary winding of the coils is measured.
6. Disconnect the white pin connector on the rear wall of the engine compartment (voltage supply to the ignition coils), connect a measuring device of your choice to one of the three connectors on terminal 15 (at the top of the plug).
7. Disconnect the three-pole connector on the final power stage (under the air filter cover), connect the second instrument lead in turn to all three terminals in the connector.
8. Nominal value: in all three measurements 0.5-1.0 ohms.
9. If the specified values are not obtained, then replace the package of ignition coils.
Checking the final power stage
Six-cylinder engine
1. Disconnect the connectors of all six injection valves.
2. Disconnect the three-pole connector on the final power stage (under the air filter cover).
3. Connect one wire of the voltage indicator LED to ground.
4. Test 1: Apply a free voltage indicator wire alternately to pins 1, 2, and 3 of the final power stage.
5. Each time, your assistant scrolls the engine with the starter.
6. The voltage LED should flicker on all three measurements, in which case the final power stage output to the ignition coils is OK.
7. Reconnect the connector.
8. Disconnect the four-pole connector on the final power stage.
9. Test 2: Alternately connect the free wire of the voltage indicator to the contacts of the disconnected connector 1, 2 and 4, at this time your assistant turns the engine over with the starter each time.
10. The voltage LED should flicker on all four pins, in which case the final power stage input signal is OK.
11. Check 3: check if the ground connection is good at pin 2 of the four-pole connector.
12. Result: If, with a working ground connection, the input signal is OK, but there is no output signal, then the final power stage is faulty.
13. If there is no input signal at all, then the cause of the malfunction is in the control unit (or in its sensors) or in the lead wire.
Checking the engine speed sensor
Six-cylinder engine
The engine speed sensor is located on the flywheel ring gear. The pin connection of its wire is led up to the bracket on the rear wall of the engine compartment, so the measurement does not need to be taken under the car.
1. Follow the wiring from the sensor to the bracket on the rear wall of the engine compartment, check the plug connectors and the wire.
2. Electrical check with an accurate ohmmeter:
3. Disconnect the gray 3-pole male connector and connect an ohmmeter to the sensor wire between pins 1 and 2.
4. The ohmmeter should show about 1 kOhm, otherwise the sensor is faulty.
5. The third pin is the shield wire.
6. To check the shielding, connect an ohmmeter now between pins 1 and 3 and then to pins 2 and 3.
7. The ohmmeter should show u Ohm, otherwise the sensor is faulty.
Checking the ignition timing sensor
Six-cylinder engine
Tips: Another check is to unscrew the sensor and clean its front. Please note: never unscrew the sensor bracket, only the sensor itself.
The ignition timing sensor is mounted on the left rear directly on the crankcase. It is tested on the black three-pole plug in the bracket on the back of the engine compartment.
The direct test is identical to how it is done on the engine speed sensor. You don't just need to clean the front.
There are no methods in the traditional sense to check the ignition/injection system control unit. But the defect is discovered in the workshop by reading the fault memory computer.
Knock sensor
knock sensor (starting with the 1.8-liter engine, two are installed) checked by interrogating the computer. There are no other ways to check. Sometimes a defective knock sensor will draw attention to itself with an intense ringing in the engine when accelerating. When installing a new knock sensor, be sure to take into account the correct tightening torque of the mounting bolt of 20 Nm.
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