Warning: Before disconnecting any electrical wiring (including high voltage) from the ignition system, the ignition must always be switched off. If this precaution is not observed, there is a risk of damage to the integrated circuit components and electric shock.
Self-monitoring system
1. Procedures for models prior to 1989 are the same as for the FEI system described in Chapter 8. The decoding of the codes is as follows.
- 1111 MPI control unit
- 2111 Engine speed sensor (grey)
- 2112 ignition timing sensor (black)
- 2113 Hall sensor
- 2114 Distributor adjustment
- 2121 idle switch
- 2141 or 2143 Knock sensor or low octane fuel
- 2142 or 2144 knock sensor
- 2212 Throttle Potentiometer
- 2242 Air volume sensor, CO potentiometer
- 2232 Air volume sensor (G70)
- 2233 Air volume sensor (G19)
- 2234 Battery voltage
- 2312 coolant temperature sensor
- 2342 Lambda sensor
- 4431 Idle mode, stabilizing valve
- 4444 No damage
- 0000 End of fault indication
2. Procedures for models from 1989 are the same as for the Motronic system described in Chapter 10. The decoding of the codes is the same as in paragraph 1 of this Chapter.
Ignition coil
3. Disconnect the wiring from the power output unit.
4. Connect a voltmeter between terminal 1 on the connector and a ground wire. Turn on the ignition, the device should have 12 volts.
5. Repeat the test by connecting the meter between terminals 1 and 3. If there is no reading, check the wiring.
6. Connect a voltmeter between terminals 2 and 3, then turn the engine rapidly with the starter. The device should show at least 0.2 volts.
7. If not, remove the glove box, disconnect the MPI control unit and disconnect the multi-pin plug (black). Using an ohmmeter, check the resistance between terminal 2 on the amplifier unit connector and terminal 9 on the multi-pin plug.
8. Check wiring between amplifier unit and ignition coil and between amplifier unit and engine.
9. Disconnect the high voltage wires from the ignition coil and the connector from the amplifier unit. Detach the clamp cover.
10. Connect an ohmmeter between the high voltage terminal and terminal 1 (-). The resistance should be 5000-9000 ohms.
11. Connect an ohmmeter between terminals 1 (-) and 15 (+). The resistance should be 0.5-1.5 ohm.
12. Replace the ignition coil and booster unit if the data is not correct.
MPI control unit
13. Remove the glove box, disconnect the MPI control unit and disconnect the black multi-pin plug.
14. Turn on the ignition, then connect the voltmeter in turn to terminals 25 and 1, 25 and 2, 25 and 13, and 25 and 21 on the multi-wire plug. The instrument should show 12 volts in each case.
15. Turn off the ignition, reconnect the connector, then turn on the ignition.
16. Connect a voltmeter between terminals 18 and 1, the meter should show 12 volts. If not, check the wiring or replace the control box.
Ignition timing sensor
17. Find the black connector and socket on the left side of the bulkhead of the engine compartment, disconnect the connector and remove it from the suspension.
18. Connect an ohmmeter between terminals 1 and 2 on the connector, the resistance should be 1000 ohms.
19. Connect an ohmmeter alternately with clamps 1 and 3, and 2 and 3, the device should show infinity.
20. Check associated wiring.
21. Remove the black bracket and disconnect the small multi-pin plug from the control box. Contact pins must be in good condition.
Hall Sensor
22. Disconnect the high voltage wiring from the cover of the breaker-distributor and ground it.
23. Disconnect the connector from the Hall sensor distributor and connect a voltmeter between the two outer clamps on the connector.
24. Turn on the ignition, the voltmeter should show 9 volts. If not, check the wiring.
25. Reconnect the connector.
26. Connect a voltmeter between terminals 1 and 2.
27. Remove the cover of the breaker-distributor, then turn the engine until the distributor slider matches the TDC mark (Chapter 3, as well as Fig. 4.21).
28. The voltmeter should show 4 volts.
29. Crank the engine up to the ignition point, the voltmeter should show 0-0.5 volts.
30. If the data is incorrect, check the wiring. Replace Hall sensor if necessary.
Visitor comments