Fuel Injection

TESTING PROCEDURE:

NOTE: While trouble shooting, always check the wiring, fuses and connectors for good condition and routing. Use the wiring diagrams found in CHASSIS ELECTRICAL DIAGRAMS to supplement your testing efforts.

Color Code Legend:

Checking ECU Ground Connections:

1. Turn ignition OFF.
2. Access fuel injection ECU by removing the passenger side kick panel and glove compartment.
3. Check fuel injection ECU ground connections. They should make good contact and fit tight.

Removing ECU Connector:

4. Remove fuse #1 (located in central electric unit behind ash tray) to interrupt the power supply. Then remove the ECU connector by pressing up the latch and folding out the wire cluster.

Removing Protective Sleeve:

5. Remove connector protective sleeve and reinstall fuse #1 for testing.
CAUTION: ^ Never check connections from the front. Connectors can get damaged and worsen the problem.
^ Check connections through the holes in the connector.
^ Connection pin numbers are printed on the connector side.

Checking Pin 4:

6. Check diagnostic socket by connecting a voltmeter between pin 4 at ECU connector and ground.

Reading: approx. 12 volts

7. If not, check wiring to fuse box and fuse #1. Repair as needed.

Selector Cable In Output 2:

8. Turn ignition ON.
9. Place selector cable into pin #2.

Checking Pin 12:

10. Connect a voltmeter between ground and pin 12 at ECU connector.

a. Reading: approx. 12 volts

b. Reading: 0 volt when button is depressed

11. If O.K., diagnostic socket is working correctly. See step 22.
12. If the diagnostic socket fails the test, check wiring between ECU connector and diagnostic socket. If wiring is O.K., see next step.

Power Source At Diagnostic Socket:

13. Disconnect diagnostic socket connector.
14. Connect voltmeter between blue wire and ground.

Reading: approx. 12 volts

15. Turn ignition OFF.

Checking Diagnostic Socket Ground:

16. Connect ohmmeter between black wire and ground.

Reading: approx. 0 ohm

Checking Diagnostic Socket Wire:

17. Connect the ohmmeter between selector cable and pin #8 (selector button) under diagnostic socket.

a. Reading: infinite

b. When the button is depressed;

Reading: 0 ohm

Checking Diagnostic Socket Diode:

18. Connect a diode tester between the diagnostic socket diode and the selector wire. Tester red (+) lead connects under diode, black (-) lead connects to the selector wire.
19. If a reading is obtained, diode is operating correctly.
20. If diagnostic socket fails any test between step 13 and 16, check wiring and connectors. Replace as needed.
21. If the socket fails test 17 to 19, replace diagnostic socket and retest.
22. Disconnect the test equipment. Remove the #1 fuse and reconnect the ECU and all other connectors, install the kick panel and glove compartment. Ensure that the rubber seal in the ECU connector is installed before it is connected to the unit.
23. Reinstall the #1 fuse.