DTC U117F-00: Lost Communication with Drive Motor Control Module "A" (ch5) (System 2) Missing Message [09/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (HYBRID MOTOR CONTROL INVERTER ASSEMBLY - TCM) WARNING:
Be sure to wear insulated gloves.
Pre-procedure1
- Check that the service plug grip is not installed.NOTE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the service information because this may cause a malfunction.
- Disconnect the hybrid motor control inverter assembly connector.
- Disconnect the TCM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result C46-36 (CALH) - C25-31 (CANI) Always Below 1 Ω Ω C46-37 (CALL) - C25-32 (CANO) Always Below 1 Ω Ω C46-36 (CALH) or C25-31 (CANI) - Body ground and other terminals Always 10 kΩ or higher kΩ C46-37 (CALL) or C25-32 (CANO) - Body ground and other terminals Always 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- None.
Result:
OK
REPLACE HYBRID MOTOR CONTROL INVERTER ASSEMBLY. Refer to REMOVAL [09/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Check that the service plug grip is not installed.