Pinpoint Test C: The Transmission Control Module (TCM) Does Not Respond To The Diagnostic Tool - Continuously Variable Transaxle (CVT): Testing
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
- C1 CHECK THE TCM C199 FOR DAMAGE
- Key in OFF position.
- Disconnect: TCM C199.
- Inspect the TCM C199 for damage.
- Is the TCM C199 OK?
- Yes : GO to C2.
- No : REPAIR the TCM C199 as necessary. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
- C2 CHECK HIGH SPEED CONTROLLER AREA NETWORK (CAN) CIRCUIT 1908 (WH) AND 1909 (BK) BETWEEN DATA LINK CONNECTOR (DLC) C251 AND TCM C199 FOR AN OPEN
- Measure the resistance between the TCM C199-6, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the TCM C199-2, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side.
- Are the resistances less than 5 ohms?
- Yes : GO to C3.
- No : REPAIR the circuit. CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
- C3 CHECK FOR CORRECT TCM OPERATION
- Disconnect all the TCM connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the TCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new TCM. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CVT A. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .