Electronic A/t Shift Lever System (Diagnostics - Introduction): Other Lexus CT I

PRECAUTION

1. PRECAUTION FOR DISCONNECTING THE CABLE FROM THE NEGATIVE AUXILIARY BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following system after the cable is reconnected: System See Procedure Parking Assist Monitor System Refer to «INITIALIZATION»(ref-568589-S03492911652013072300000) Power Door Lock Control System
2. NOTICE FOR HYBRID SYSTEM ACTIVATION When the warning light is illuminated or the auxiliary battery has been disconnected and reconnected, pressing the power switch may not start the system on the first try. If so, press the power switch again.
3. CAN COMMUNICATION SYSTEM PRECAUTIONS The CAN communication system is used for data communication between the transmission control ECU assembly, the power management control ECU and other ECUs. If there are any problems in the CAN communication lines, corresponding DTCs are output. If any CAN communication DTCs are output, repair the malfunction and troubleshoot the electronic shift lever system after data communication becomes normal.
4. LIN COMMUNICATION SYSTEM PRECAUTIONS The LIN communication system is used for data communication between the transmission control ECU assembly, the certification ECU and other ECUs. If there are any problems in the LIN communication lines, park (P) cannot be disengaged. If any LIN communication DTCs are output, repair the malfunction and troubleshoot the electronic shift lever system after data communication becomes normal.
5. DTC PRECAUTION It may not be possible to clear the following DTCs using the Techstream: DTC C2300 (Actuator System Malfunction), C2301 (Shift Changing Time Malfunction), C2303 (Short in Power Source Relay Circuit), C2304 (Open or Short Circuit in U Phase), C2305 (Open or Short Circuit in V Phase), C2306 (Open or Short Circuit in W Phase), C2307 (Power Supply) and C2309 (Open in B+ Circuit). In such cases, disconnect the P CON MAIN fuse and wait for at least 60 seconds to clear the DTCs after the repair.

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1. SYSTEM DESCRIPTION The electronic shift lever system electrically controls the parking lock mechanism using an actuator. The transmission control ECU assembly locks/unlocks gearshift control based on lock/unlock request signals from the certification ECU (smart key ECU assembly). The transmission control ECU assembly receives the theft deterrent status (lock or unlock) from the certification ECU (smart key ECU assembly). Based on this signal, and other information received from the power management control ECU, the transmission control ECU assembly controls the shift control actuator assembly and other parts of the system. The transmission control ECU assembly detects DTCs when there are any malfunctions in the system, and informs the driver of selected malfunctions by illuminating the master warning light, and indicating an error message on the multi-information display. HINT: Depending on the DTC that is stored, the master warning light may not illuminate and an error message may not be displayed on the multi-information display.
2. SYSTEM DIAGRAM INPUT AND OUTPUT SIGNALS OF EACH ECU Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Main Body ECU Power Management Control ECU Parking brake switch signal CAN Main Body ECU Transmission Control ECU Assembly Power switch signal ACC switch signal CAN Transmission Control ECU Assembly Power Management Control ECU Park (P) state signal Transmission control ECU assembly trouble condition signal CAN, SIL Power Management Control ECU Power Management Control ECU Auto park (P) request signal Auto park (P) complete signal CAN Transmission Control ECU Assembly Combination Meter Assembly Park (P) state signal Other than park (P) state signal Transmission control ECU assembly trouble condition signal CAN Power Management Control ECU Combination Meter Assembly Shift position signal Hybrid vehicle control ECU trouble condition signal CAN Transmission Control ECU Assembly Certification ECU Gear shift control lock state signal LIN
3. FUNCTION OF EACH COMPONENT Part Name Function Shift Control Actuator Assembly Composed of a parking lock motor and rotation angle sensor. The motor is activated by electric current from the transmission control ECU assembly. Motor rotation is reduced by the cycloid reduction mechanism in the shift control actuator assembly and then output. The rotation angle sensor detects the motor rotation angle with the 2 Hall ICs. Transmission Control ECU Assembly The transmission control ECU assembly activates the shift control actuator assembly based on signals from the power management control ECU. The transmission control ECU assembly controls the application timing of current to the parking lock motor based on signals from the rotation angle sensor. Parking Lock Mechanism The parking lock pawl rotates according to the movement of the parking lock rod when the parking lock motor rotates, and engages with the parking gear on the transaxle side, causing the parking lock mechanism to lock or unlock. Power Management Control ECU The power management control ECU sends a P lock or P unlock demand signal to the transmission control ECU assembly based on information from the shift lever and the P position switch (transmission shift main switch). P Position Switch Indicator Light The P position switch indicator light comes on or goes off to indicate the P lock/unlock status. The P position switch indicator light goes off when the electronic shift lever system malfunctions and an error message is displayed on the multi-information display. Combination Meter Assembly A malfunction in the transmission control ECU assembly is indicated by the illumination of the master warning light on the combination meter.
4. OPERATION DESCRIPTION Operation when switching to park (P): When the P position switch (transmission shift main switch) is pushed to activate the parking lock, a signal is sent to the power management control ECU. The power management control ECU determines whether "P lock" is possible or not based on this signal and other vehicle information. If the power management control ECU determines that "P lock" is possible, it sends a "P lock" operation demand signal to the transmission control ECU assembly. After receiving the signal, the transmission control ECU assembly activates the shift control actuator assembly in order to lock the parking lock mechanism. The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator assembly. HINT: In the cycloid reduction mechanism, the output shaft is linked to the external gear. Together, they rotate only a single tooth when the eccentric adapter, which is linked to the motor, rotates once. Driving force is increased in this way so that the parking lock mechanism can be switched even when high output is required for parking on a hill, etc. The P position switch indicator light is illuminated. Operation to switch from park (P) to a shift state other than park (P): When the hybrid system is started (the vehicle is ready to be driven) and the shift lever is moved to R, N, or D with the brake pedal depressed, a signal is sent to the power management control ECU. This signal is then sent from the power management control ECU to the transmission control ECU assembly as a "P lock release" operation demand signal. After receiving the signal, the transmission control ECU assembly activates the shift control actuator assembly in order to unlock the parking lock mechanism. The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator assembly. The P position switch indicator light is turned off.
5. SHIFT STATE CHANGE FUNCTION The electronic shift lever system comprehensively determines vehicle conditions and changes the shift state, as shown in the following chart, by cooperating with the shift control function of the hybrid system (except when the reject function described later is in operation). Other than indicated in the following chart, when the power switch is turned off with the vehicle stopped, the shift state is automatically changed to park (P) and all power is turned off.
6. REJECT FUNCTION In the electronic shift lever system, there may be a situation in which a shift state change cannot be done for safety reasons. When attempting to move the shift lever in such a situation, the system sounds a reject buzzer inside the meter and changes the shift state as shown in the following table. Selector operation which causes reject function to operate Shift state after rejection The shift lever is moved to any position with park (P) selected and the brake pedal not depressed. Remains in park (P) The P position switch (transmission shift main switch) is pushed while driving. Changes to neutral (N) The shift lever is moved to R with drive (D) selected, or D with reverse (R) selected while the vehicle is moving at 11 km/h (7 mph) or more. Changes to neutral (N) The shift lever is moved to B with a shift state other than drive (D) or park (P) selected. Changes to neutral (N) The shift lever is moved to B with park (P) selected and the brake pedal depressed. Remains in park (P)
7. P POSITION SWITCH INDICATOR LIGHT CONTROL The indicator light comes on when park (P) is selected, goes off when a shift state other than park (P) is selected and goes off when a system malfunction occurs and an error message is displayed on the multi-information display. INDICATOR LIGHT DTC No. Indicator Light Suspected Cause C2300 Goes off (An error message is displayed on the multi-information display.) Shift count malfunction Initial drive mode Park lock/unlock position detection mode Feedback drive mode Range of movement C2301 Goes off (An error message is displayed on the multi-information display.) Shift changing time malfunction C2303 Normal (Comes on when park (P) is selected and goes off when another shift state is selected) P CON MTR relay (transaxle parking lock control relay) lockup C2304 Goes off (An error message is displayed on the multi-information display.) Open or short in shift control actuator assembly [parking lock motor (MUA)] signal circuit C2305 Goes off (An error message is displayed on the multi-information display.) Open or short in shift control actuator assembly [parking lock motor (MVA)] signal circuit C2306 Goes off (An error message is displayed on the multi-information display.) Open or short in shift control actuator assembly [parking lock motor (MWA)] signal circuit C2307 Goes off (An error message is displayed on the multi-information display.) Power source circuit malfunction C2308 Normal (Comes on when park (P) is selected and goes off when another shift state is selected) Transmission control ECU assembly internal error C2309 Goes off (An error message is displayed on the multi-information display.) Open in +B signal circuit C2310 Normal (Comes on when park (P) is selected and goes off when another shift state is selected) Open or short in BATT signal circuit C2311 Goes off (An error message is displayed on the multi-information display.) PCON DUTY malfunction Open or short in PCON signal circuit C2315 Normal (Comes on when park (P) is selected and goes off when another shift state is selected) Open or short in PPOS signal circuit P position switch circuit malfunction U0146 Normal (Comes on when park (P) is selected and goes off when another shift state is selected) CAN communication system malfunction NOTE: Even if the system has returned to normal, with park (P) selected, the indicator light does not return to normal without selecting a shift state other than park (P). (Normal refers to the indicator light coming on when park (P) is selected and going off when another shift state is selected.)

FREEZE FRAME DATA

1. CHECK FREEZE FRAME DATA HINT: The transmission control ECU assembly records vehicle and driving condition information as freeze frame data the moment a DTC is stored. Freeze frame data can help determine the vehicle conditions when the malfunction occurred and help duplicate conditions when troubleshooting. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / Transmission Control / Trouble Codes. Select a DTC in order to display its freeze frame data.
2. LIST OF FREEZE FRAME DATA Tester Display Measurement Item Reference Value Shift Pos Display (P) Shift position display (P) ON / OFF Shift Pos Display (Not P) Shift position display (not P) ON / OFF Master Caution Display Master caution display Disp / Nondisp PSW Indicator Mode PSW indicator mode OFF / ON U Phase Voltage Value U phase voltage value 0 to 39 V V Phase Voltage Value V phase voltage value 0 to 39 V W Phase Voltage Value W phase voltage value 0 to 39 V Battery Voltage Value BATT voltage value 0 to 19 V IG(+B) Voltage Value IG (+B) voltage value 0 to 19 V Cmplte of Learn Lck Pos Completion of lock position learning OK / NG Cmplte of Learn Unlck Pos Completion of unlock position learning OK / NG # of Trip Cuntr after Learn Counter for number of trip after learning 0 to 65535 Main Relay for Motor Drive P CON MTR relay (transaxle parking lock control relay) for motor drive ON / OFF U Phase Crnt-Carry Status U phase current-carrying status ON / OFF V Phase Crnt-Carry Status V phase current-carrying status ON / OFF W Phase Crnt-Carry Status W phase current-carrying status ON / OFF U Phase Voltage Status U phase voltage status ON / OFF V Phase Voltage Status V phase voltage status ON / OFF W Phase Voltage Status W phase voltage status ON / OFF Battery Voltage Status BATT voltage status ON / OFF IG(+B) Phase Vol Status IG (+B) phase voltage status ON / OFF ACC Condition Signal ACC condition signal ON / OFF Init Drv Cntrl Completed Initial drive control completed OK / NG Cmplte of Detct Lck Pos Completion of detecting lock position OK / NG Cmplte of Detct Unlck Pos Completion of detecting unlock position OK / NG P/Not P Move Shft Range P/Not P movable shift range Set / Unset Main Relay P CON MTR relay (transaxle parking lock control relay) Normal / Abnoml Current flag record Current flag record ON / OFF Fail Rank Fail rank 0 to 255 Detail Information #

FAIL-SAFE CHART

If the transmission control ECU assembly detects a malfunction, the fail-safe functions shown in the table below are activated.