Test B: The Transmission Control Module (TCM) Does Not Respond To The Diagnostic Tool

PINPOINT TEST B: THE TRANSMISSION CONTROL MODULE (TCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

B1-B2:

B2-B3:

B4:

Normal Operation
There are 2 types of TCMs available. The FNR5 transaxle or the 6-speed transaxle each use a unique TCM.

The TCM communicates with the diagnostic tool through the high speed controller area network (CAN), circuits VDB04 (WH/BU) and VDB05 (WH).

Check the high speed CAN circuits VDB04 (WH/BU) and VDB05 (WH) between the TCM C2352b (FNR5) or C1533 (6-speed) and the data link connector (DLC) C251.The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the high speed CAN circuits, damage to the DLC C251, damage to the TCM C2352b (FNR5) or C1533 (6-speed), or a problem in an in-line connector.

Possible Causes
- high speed CAN data plus circuit VDB04 (WH/BU) open
- high speed CAN data minus circuit VDB05 (WH) open
- TCM C2352b (FNR5) or C1533 (6-speed)
- TCM