High Power Ignition System (HEI)
Note. When checking or replacing the unit, it is not necessary to remove the ignition distributor.
Note. Designations of conclusions on the block of ignition are resulted on an illustration 6.5.
Examination
1. Disconnect the four-pin connector of the ignition distributor (see illustration).
9.1. Using a small screwdriver, pry off the stopper on the ignition distributor connector
2. Check for spark at ignition coil and wires (section 6).
3. If there is no spark, remove the distributor cap. Connect the four-pin connector to the distributor.
4. With the ignition switch in position "ON" ("ON"), measure the voltage on the positive ("+") block terminal (pink wire) (see illustration).
9.4. Measure the battery voltage by connecting the voltmeter lead to the positive terminal (pink wire) on the ignition block
5. If the measured voltage is less than 10 V, then the wiring between the positive terminal of the block and the positive connector of the ignition coil or between the ignition coil and the contact of the primary winding with the ignition switch is faulty.
6. If the measured voltage is equal to or greater than 10V, check the condition of the terminal "WITH" (brown wire) on the block (see illustration 9.4).
7. If the voltmeter shows less than 1 V, this means the presence of an open or shorted to "mass" wires in the circuit section between the distributor and the terminal "WITH" coil or an open primary circuit in the ignition coil itself.
8. If the device shows a voltage of one to ten volts, replace the unit with a new one and check for a spark (see section 6). The presence of a spark means that the unit was faulty and the system is now working normally. If there is no spark, then the ignition coil is faulty.
9. If, when performing step 4, the voltmeter shows ten or more volts, disconnect the sensor terminal from the block. With the ignition on, measure the voltage at the terminal "WITH" (brown wire) and by connecting for a short time (no more than five seconds) a test lamp between the positive terminal of the battery and the terminal "R" (output from the sensor, brown wire) on the block, observe the readings of the voltmeter (see illustration).
9.9. By connecting a voltmeter to the terminal "WITH" (brown wire), carefully observe the voltage drop when the test lamp is turned on for a short time (no more than five seconds) between the positive terminal of the battery and the terminal "R" (measuring coil) on the body of the block
10. If the voltage has not dropped, check the wire "masses" block and if it is not damaged, replace the block with a new one.
11. If the voltage drops, disconnect the control lamp from the terminal on the block and check for a spark on the coil wire. If there is no spark, then the unit is faulty and needs to be replaced. The presence of a spark means that the sensor or connections are faulty or not connected to "weight" (see illustration 9.9).
Replacement
12. Disconnect a wire from a negative conclusion of the storage battery.
13. Remove the cover and ignition distributor rotor.
14. Having unscrewed both bolts of fastening of the block, remove it from the distributor.
15. Disconnect both electrical outlets from the block (see illustration). Note that these conclusions are not interchangeable.
9.15. Disconnect both electrical connectors from the unit
16. If you intend to install a block removed from it on the distributor, do not wipe traces of grease from the block and the distributor base. When installing a new block that comes with a pack of silicone grease, wipe the block and distributor body clean, then apply a layer of this grease to the surface of the block and distributor body (see illustration). Lubrication is used for more efficient heat dissipation.
9.16. Silicone grease applied to the base of the ignition distributor under the ignition block helps dissipate heat more efficiently (distributor removed for better visibility)
17. Install the block and attach both electrical outlets to it.
18. Install rotor and distributor cap (see chapter 1).
19. Connect a wire to a negative conclusion of the storage battery.
Direct ignition system (DIS)
Examination
20. First of all, perform the ignition system checks presented in section 6.
21. To check the ignition unit, disconnect the 14-pin electrical connector from it (see illustrations).
9.21a. After loosening the electrical connector, remove it from the ignition unit. The color marking of wires and the connection diagram are shown in illustration 9.21b
9.21b. Scheme of electrical connections of the ignition system of the engine 3.8 l
22. Connect an injector test lamp to the electrical contact of one of the injectors.
23. Turn on the ignition, connect one output of the test lamp to the positive terminal of the battery, and with the second touch the contact several times "D" on the ignition block (purple-white wire). At the same time, the injector test lamp should flash.
24. If the lamp for checking the injectors does not blink, check the section of the electric circuit of the injectors, starting from the PCM control unit, or the fuel level sensor circuit, starting from the ignition unit (see illustration 9.21b).
25. If the injector test lamp flashes, connect the wire from the fuse between the "N" (black and white wire) on the connector of the ignition unit and the positive terminal of the battery. Connect the second same wire from the fuse between the contact "M" (grey-red wire) And "weight". Connect a voltmeter between the contact "H" (bluish white wire) on the connector of the ignition unit and the positive terminal of the battery. Turning the crankshaft, note the instrument readings: the measured voltage should be approximately 1.7 V.
26. If the voltage is higher or lower than the specified value, check all electrical circuits from the ignition unit to the crankshaft position sensor for open or short circuits.
27. If the measured voltage is 1.7V, turn on the tester between the contact "G" (white-blue wire) on the ignition unit and the positive terminal of the battery. When the starter rotates, the voltage should be 5.5 V.
28. If the voltage measured by the device is higher or lower than the specified value, check the blue-white wires from the crankshaft position sensor for a short circuit or open circuit. Replace sensor if necessary.
29. If the measured voltage is 5.5 V, turn on the voltmeter between the contact "R" (pink and black wire) on the connector of the ignition unit and "weight". The device should show a voltage equal to the battery voltage.
30. If the measured voltage differs from the specified value, check and repair the pink-black wire of the ignition circuit from the ignition unit to the fuel pump relay.
31. If the voltage is as specified, replace the ignition unit.
Replacement
32. Remove individually the coils from the ignition unit (see illustration 7.14).
33. Disconnect the electrical connector from the ignition unit.
34. Turn away bolts of fastening of the block of ignition to the engine.
35. The block is installed in the reverse order.