|
|
Transmission Control System (Smoother) 7A-171 U0401 (Flash Code 24) Circuit Description • The ignition switch is ON. Condition for Setting the DTC • The TCM detects that the accelerator pedal position CAN Bus messages from the ECM are not Action Taken When the DTC Sets • The TCM illuminates the transmission warning lamp when the diagnostic runs and fails. • The TCM inhibits auto shift control. • The TCM inhibits gear select & shift position learning and half-clutch learning. Condition for Clearing the DTC • The TCM turns OFF the transmission warning lamp when the diagnostic runs and does not fail. • A current DTC clears when the diagnostic runs and does not fail. • A history DTC clears when the diagnostic runs and does not fail. Diagnostic Aids • If an intermittent condition is suspected, refer to Intermittent Conditions in this section. • If this DTC is present, poor shift quality (feel) will appear. DTC U0401 (Flash Code 24) Schematic Reference: Transmission Controls Step Action Value(s) Yes No 1 Did you perform the Diagnostic System Check - — Go to Step 2 Go to Diagnostic System Check - Transmission Controls 2 1. Install the Tech 2. Information with the Tech 2. Is DTC U0100 or U0121 set? — Go to Applicable DTC Go to Step 3 3 1. Select the “4HK1” in the system selection menu. 2. Monitor the DTC Information with the Tech 2. Is the engine control module (ECM) DTC P1271, — Go to Applicable DTC in Engine Control Section Go to Diagnostic Aids |