Pinpoint Test K: DTC U0101:00

Remote Function Actuator (RFA) Module

Pinpoint Test K: DTC U0101:00

Normal Operation
- DTC U0101:00 (Lost Communication with TCM: No Sub Type Information) - sets in the Remote Function Actuator (RFA) module if data messages received from the Transmission Control Module (TCM) over the High Speed Controller Area Network (HS-CAN) are missing.

This pinpoint test is intended to diagnose the following:

- TCM
- RFA module

PINPOINT TEST K: DTC U0101:00

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K1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to K2.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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K2 CHECK THE COMMUNICATION NETWORK

- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the TCM pass the network test?

Yes
GO to K3.

No
REFER to Module Communications Network Testing and Inspection.

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K3 RETRIEVE THE RECORDED DTCs FROM THE RFA MODULE SELF-TEST

- Check for recorded RFA module DTCs from the self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
For DTC U3003:16, GO to Pinpoint Test O. For DTC U3003:17, GO to Pinpoint Test P. Pinpoint Test O: DTC U3003:16 Pinpoint Test P: DTC U3003:17

No
GO to K4.

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K4 RECHECK THE RFA MODULE DTCs

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI may not have been carried out.

- Clear the DTCs. Repeat the RFA module self-test.
- Is DTC U0101:00 still present?

Yes
GO to K5.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic.

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K5 CHECK FOR DTC U0101:00 OR DTC U0101 SET IN OTHER MODULES

- Clear all DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test .
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0101:00 or DTC U0101 set in any other module?

Yes
INSTALL a new TCM. REFER to Automatic Shifting Manual Transmission/Transaxle Transmission Control Module (TCM). CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new RFA module. REFER to Remote Function Actuator (RFA) Module Service and Repair. TEST the system for normal operation.

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