Transmission Drive Cycle

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.

Record codes and clear PCM memory. Warm engine to normal operating temperature. With vehicle stopped on open road, place gear selector in Drive and accelerate heavily to 35 MPH. Stop vehicle and turn ignition off.

1) Continuous Memory DTC P0715 & P0720

Perform TRANSMISSION DRIVE CYCLE. Perform KOEO self-test. If Continuous Memory DTC P0715 or P0720 is present, go to next step. If no codes are present, go to CIRCUIT TEST Z.

2) Check OSS/TSS Circuit Continuity

Turn ignition off. Disconnect OSS/TSS sensor. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 84 (OSS/TSS) and OSS/TSS terminal at OSS/TSS wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST .

3) Check OSS/TSS Circuit For Short To Ground

Leave ignition off and OSS/TSS sensor disconnected. Measure resistance between test pins No. 51 (GND) and 84 at breakout box. If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair faulty resistor or short circuit and repeat QUICK TEST .

4) Check OSS/TSS Circuit For Short To Power

Leave ignition off and OSS/TSS sensor disconnected. Measure 6resistance between test pins No. 71 (VPWR) and 84 at breakout box. If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short in OSS/TSS circuit and repeat QUICK TEST .

5) Check OSS/TSS Sensor Resistance

Leave ignition off and OSS/TSS sensor disconnected. Measure resistance between OSS/TSS sensor terminals. OSS sensor resistance should be 450-750 ohms. TSS sensor resistance should be 64-200 ohms. If resistance is not as specified, replace OSS/TSS sensor. If resistance is as specified, check transmission for mechanical faults. If transmission is okay, replace PCM and repeat QUICK TEST .