AX4S

PINPOINT TEST F: DIAGNOSTIC TROUBLE CODE: 639 INSUFFICIENT INPUT FOR TRANSMISSION SPEED SENSOR

This Pinpoint Test is designed to diagnose the transmission speed sensor (TSS) electrical system ONLY.
To prevent replacement of good components, note that the following areas may be at fault.
- Engine - Performance, cooling
- Electrical - Battery, wiring harnesses
- Transmission - Internal transmission components, cooling, fluid

This Pinpoint Test is designed to diagnose the following components:
- Transmission Wiring Harness, TSS, SIGNAL RETURN
- Powertrain Control Module (PCM)

Refer to the foliowing schematic and charts when performing the Pinpoint Test steps