Aspirator: Testing and Inspection

Aspirator Fan Circuit Troubleshooting

1. Check the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES - Go to step 2.

NO - Replace the fuse, and recheck.

2. Disconnect the in-car temperature sensor 4P connector.
3. Turn the ignition switch ON (II).




4. Measure the voltage between the No. 1 terminal of the in-car temperature sensor 4P connector and the body ground.

Is there battery voltage?

YES - Go to step 5.

NO - Repair open in the wire between the No. 30 fuse in the driver's under-dash fuse/relay box and the aspirator fan.




5. Connect the No. 4 terminal of the in-car temperature sensor 4P connector to body ground with a jumper wire.

Does the aspirator fan run?

YES - Check for an open in the wire between the aspirator fan and body ground. If the wire is OK, check for poor ground at G503.

NO - Replace the aspirator fan.