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

Communications Network

Pinpoint Tests

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

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 30, Transmission Controls - 6R60 for schematic and connector information. Diagrams By Number

Normal Operation

The 6R60 transmission utilizes a Transmission Control Module (TCM) to control transmission functions. The TCM communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- TCM



PINPOINT TEST B: THE TCM DOES NOT RESPOND TO THE SCAN TOOL

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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B1 CHECK THE TCM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN


- Ignition OFF.
- Disconnect: TCM C1575 (6R60 Transmission).
- Ignition ON.
- Measure the voltage between the TCM C1575-9, circuit CE517 (BU/GN), harness side and ground; and between the TCM C1575-14, circuit SBB27 (BU/RD), harness side and ground.




- Are the voltages greater than 10 volts?

Yes
GO to B2.

No
VERIFY the Battery Junction Box (BJB) fuse 27 (20A) or Smart Junction Box (SJB) fuse 9 (2A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool. Diagrams By Number

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B2 CHECK THE TCM GROUND CIRCUITS FOR AN OPEN


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the TCM C1575-13, circuit GD113 (BK/YE), harness side and ground; and between the TCM C1575-16, circuit GD113 (BK/YE), harness side and ground.




- Are the resistances less than 5 ohms?

Yes
GO to B3.

No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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B3 CHECK THE HS-CAN CIRCUITS BETWEEN THE TCM AND THE DLC FOR AN OPEN


- Measure the resistance between the TCM C1575-6, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.




- Measure the resistance between the TCM C1575-2, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.




- Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to B4.

No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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B4 CHECK FOR CORRECT TCM OPERATION


- Disconnect the TCM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the TCM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new TCM. REFER to Mechatronic Assembly in Automatic Transmission/Transaxle &/or Transmission Control Systems. CLEAR the DTCs. REPEAT the network test with the scan tool.

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 network test with the scan tool.

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