The ABS control module continually monitors all wheel speed circuits is open, grounded, or shorted to battery, ABS will be disabled and the antilock telltale lamp will be turned On.

Code 34 sets if:

Left rear wheel speed circuit is open, grounded, or shorted to battery.

This code can set anytime after the key is turned to the RUN position. The vehicle does not have to be moving.

Before proceeding with the trouble tree, make a thorough visual inspection of the wheel speed sensor circuitry. Closely inspect the inline connector(s) since this is the most likely area for opens or shorts.

When attempting to diagnose an intermittent problem, use the Scan tool to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

Select Malf History from Scan tool ABS menu.

Intermittents, shorts or opens suspected to be at the connectors can be detected by using a diagnostic service probe. Voltage can be read on wires without disconnecting any connectors

Check the tightness of the female terminal grip with a spare male terminal