Diagnostic Aids

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 Terminals

Fig 2: F4E Transmission Test Circuit & Connector Terminals

Fig 3: 4R44E/4R55E Transmission Test Circuit & Connector Terminals