Bosch

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 Pin 14:

6. Connect an ohmmeter between pin 14 at ECU connector and ground.

Reading: approx. 0 - 5 ohms

7. If not, check wiring and connectors. If they are O.K., fault is in the A/C system or A/C pressure sensor. For testing the A/C system and components, see HEATING VENTILATION AND AIR CONDITIONING.
8. 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.
9. Reinstall the #1 fuse.