Neutral Safety Switch: Testing and Inspection

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.

Fuel Injection, Ignition Control Unit (ECU) And System Relay:

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.

Disconnecting ECU Connector:

4. Remove ECU connector by pressing up the latch and folding out the wire cluster.

Removing Protective Sleeve:

5. Remove connector protective sleeve.
IMPORTANT: ^ 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 Gear Selector Signal:

6. Put gear selector in N (neutral) position.
7. Connect an ohmmeter between ECU connector pins 30 and ground.

Reading: 0 ohm

8. Put gear selector in D (drive) position.
9. Check resistance.

Reading: infinite (the reading should be 0 ohm on vehicles with manual transmission)

10. If switch fails the test, check wiring and connectors. If no fault found in wiring, replace gear selector switch.
11. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.