Diagnostic Aids

WARNING: This page is about a different car, the 1995 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

Wiring harness circuits (OSS/TSS and SIG RTN).
Faulty OSS sensor.
Faulty TSS sensor.
Faulty Powertrain Control Module (PCM).

Fig 1: OSS/TSS Test Circuit & Connector Terminal ID (Ranger)

Fig 2: Transmission Test Circuit & Connector Terminal ID (Ranger)