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 SCHEMATIC 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 Pins# 6 And 7:

6. Check air mass meter by connecting an ohmmeter between ECU connector pins 6 and 7.

Reading: 2.5 - 4.0 ohms

a. If reading is incorrect, replace air mass meter and retest.
b. If reading is correct, continue with next steps.

Checking Pin# 9:

7. To check the system relay (located in central electric unit behind ash tray), connect a voltmeter between ground and ECU connector pin 9.
8. Connect a lead between ground and ECU connector pin 21. The relay should now close and the voltmeter should show:

Reading: approx. 12 volts

If reading is no or low voltage, check fuse #1 (located in central electric unit behind ash tray), battery, wiring to battery and connectors.
a. If fault found, repair as needed and retest
b. If no fault found (all is in good working condition), replace system relay and retest.

Removing Rubber Boot:

9. Check the air mass meter by removing the rubber sleeve from the connector to access wiring.

Checking Pin# 5:

10. Connect the voltmeter between ground and terminal# 5 (positive lead from system relay) at air mass meter.

Reading: approx. 12 volts

a. If reading is incorrect, check and repair wiring from the air mass meter to the system relay.
b. If reading is correct, continue with next steps.
11. Connect the voltmeter between terminals# 1 (ground) and 5 (positive lead from system relay).

Reading: approx. 12 volts

a. If reading is incorrect, check and repair wiring from the air mass meter to ground and retest.
b. If reading is correct, continue with next steps.
12. Remove the lead between pin 21 at ECU connector and ground.
13. NOTE: The following steps require that the engine coolant temperature is at least 140°F (60°C).
14. Disconnect the test equipment.
15. Remove the #1 fuse and reconnect the ECU connector, install the kick panel and glove compartment. Ensure that the rubber seal in the connector is installed before it is connected to the ECU.
16. Reinstall the #1 fuse.
17. Run engine to operating temperature.

Checking Air Mass Meter Connections# 1 And 4:

18. Connect a voltmeter to terminals# 1 and 4 at the air mass meter.
19. Rev engine to over 2100 RPM, then turn ignition OFF. After about four seconds, the voltmeter should oscillate for approx. one second (hot-wire burn off).
If the air mass meter fails this test, replace and retest with new air mass meter.
20. 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.
21. Reinstall the #1 fuse.