Circuit/System Testing

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the 4-way Speed Sensor Connector (C3) at the TCM.
Ignition ON, Test for 9-12 volts between the high signal circuit, TCM terminal C3-3 (ISS) or C3-2 (OSS) and low signal circuit, TCM terminal C3-4 (ISS) or C3-1 (OSS).
- If not within the specified range, replace the TCM. Refer to Transmission Control Module Removal procedure and Transmission Control Module Installation procedure.
If the circuits test normal, test or replace the speed sensor.