Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 1994 >> Taurus V6-232 3.8L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Pinpoint Tests >> TB - 4X4 Low/Transmission Control TCIL-TCS-TCSM >> TB8 - Check Continuity of Control Switch Harness
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

TB8 - Check Continuity of Control Switch Harness



- Key "OFF".

- Breakout Box connected, Powertrain Control Module (PCM) disconnected.

- Appropriate switch disconnected.

- For 4x4 Low circuit:

- Measure the resistance between test pin 12 at the breakout box and 4x4 Low circuit at 4x4 Low switch touch drive module vehicle harness connector.

- For Transmission Control Switch (TCS) / Transmission Control Indicator Lamp (TCIL) circuit:

- Measure the resistance between keypower at the fuse panel (fuses) (ohmmeter positive probe) and power side of transmission control switch vehicle harness connector (ohmmeter negative probe).

- Measure the resistance between test pin 41 at the breakout box and signal side of transmission control switch vehicle harness connector.

- Are both resistances less than 5.0 ohms?

Yes -- Go to TB9. TB9 - Check Harness Circuit(s) For Shorts to Power

No -- Service open circuit(s). Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

pro multis · About Operation CHARM