Electronic Shift Lever (Diagnostic Codes & Circuit Tests): Overview Lexus HS I

DESCRIPTION

The shift control actuator consists of the parking lock motor and the rotation angle sensor. The transmission control ECU receives a P position switch signal from the hybrid vehicle control ECU and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. The transmission control ECU also detects the rotor rotation angle through the rotation angle sensor to control timing of current application to the coils. The transmission control ECU outputs this DTC when it detects a malfunction in the shift control actuator system.

Scheme 104

The transmission control ECU receives a P position switch signal from the hybrid vehicle control ECU and then activates the shift control actuator. At the same time, the transmission control ECU detects the length of time it takes for the parking lock mechanism to switch. The transmission control ECU outputs this DTC when this length of time is longer than specification.

Scheme 105

The No. 2 integration relay is activated by output voltage from the transmission control ECU and supplies power to the shift control actuator (parking lock motor). The transmission control ECU outputs this DTC when it detects a malfunction in the No. 2 integration relay.

The shift control actuator consists of the parking lock motor and the rotation angle sensor. The transmission control ECU receives a P position switch signal from the hybrid vehicle control ECU and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. The transmission control ECU outputs these DTCs when it detects a malfunction in the parking lock motor system.

The shift control actuator consists of the parking lock motor and the rotation angle sensor. The transmission control ECU receives a P position switch signal from the hybrid vehicle control ECU and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. The transmission control ECU outputs this DTC when it detects a malfunction in the parking lock motor system and/or the ground circuit.

Scheme 106

The transmission control ECU assembly monitors its internal operation and it will set this DTC when it detects an EEPROM malfunction. If this DTC is output, replace the transmission control ECU assembly.

Battery voltage will be applied to the +B terminal when the power switch is turned on (IG). When a +B terminal voltage malfunction is detected, the transmission control ECU outputs this DTC.

The battery voltage is constantly applied to terminal BATT. The terminal BATT voltage is used to power the transmission control ECU memory. The transmission control ECU outputs this DTC when it detects a malfunction related to terminal BATT.

HINT

When there is an open or short in the BATT circuit, information on the actuator position (park (P) engaged or park (P) not engaged) stored in the transmission control ECU is cleared every time the power switch is turned off. Therefore, the ECU works to recognize the position each time the power switch is turned on (IG). As a result, the time from when the power switch is turned on (IG) until "READY ON" is indicated may become longer than normal.

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1. INSPECT FUSE (P CON MAIN) Remove the P CON MAIN fuse from the engine room junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition P CON MAIN fuse Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Junction Block Assembly *2 P CON MAIN fuse Install the P CON MAIN fuse. NG --> REPLACE FUSE (P CON MAIN) OK: Go to next step
2. READ VALUE USING TECHSTREAM (BATTERY VOLTAGE VALUE) Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Chassis / Transmission Control / Data List / Battery Voltage Value. Read the Data List displayed on the Techstream. Result Tester Display Condition Specified Condition Battery Voltage Value Always 9 to 14 V Turn the power switch off. NG --> See step 3 OK --> See step 4
3. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY - P CON MAIN FUSE) Disconnect connector A35 from the transmission control ECU assembly. Disconnect the P CON MAIN fuse from the engine room junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Switch Condition Specified Condition A35-15 (BATT) - 2 (P CON MAIN fuse) Power switch off Below 1 ohms Standard Resistance (Check for Short) Tester Connection Switch Condition Specified Condition A35-15 (BATT) or 2 (P CON MAIN fuse) - Body ground and other terminals Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Transmission Control ECU Assembly) *2 Engine Room Junction Block Assembly *3 P CON MAIN fuse NOTE: Be careful not to break the fuse holder by forcing the tester probes into it during this inspection. Install the P CON MAIN fuse. Connect the transmission control ECU assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> CHECK AND REPAIR POWER SOURCE CIRCUIT
4. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY. Refer to «COMPONENTS»(ref-398214-S31258116822011051600000)

The transmission control ECU receives a P position switch signal from the hybrid vehicle control ECU and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. The transmission control ECU outputs this DTC when it detects a communication error between the hybrid vehicle control ECU and the transmission control ECU.

Scheme 110

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Scheme 112

1. CHECK TRANSMISSION CONTROL ECU ASSEMBLY Turn the power switch on (IG). Connect an oscilloscope between the transmission control ECU assembly terminals specified in the table below, and check the waveform. Item Contents Symbols A36-22 (PCON) - A36-1 (E1) Tool setting 5 V/DIV., 20 msec./DIV. Vehicle condition Power switch on (IG) OK The waveform (Scheme 111) appears as shown in the illustration. TEXT IN ILLUSTRATION *1 Component with harness connected (Transmission Control ECU Assembly) *2 Waveform (Scheme 111) HINT: Perform this inspection with the connector connected. Turn the power switch off. NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - HYBRID VEHICLE CONTROL ECU) Disconnect connector A36 from the transmission control ECU assembly. Disconnect connector A58 from the hybrid vehicle control ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Switch Condition Specified Condition A36-22 (PCON) - A58-102 (PCON) Power switch off Below 1 ohms Standard Resistance (Check for Short) Tester Connection Switch Condition Specified Condition A36-22 (PCON) or A58-102 (PCON) - Body ground and other terminals Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Transmission Control ECU Assembly) *2 Front view of wire harness connector (to Hybrid Vehicle Control ECU) Connect the hybrid vehicle control ECU connector. Connect the transmission control ECU assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY. Refer to «COMPONENTS»(ref-398214-S31258116822011051600000)
4. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to «COMPONENTS»(ref-398232-S05375191312011051600000)

The transmission control ECU receives a P position switch signal from the hybrid vehicle control ECU and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. When the hybrid vehicle control ECU detects a malfunction with the P position switch or P position signal, it sends an information signal to the transmission control ECU. After receiving this signal, the transmission control ECU outputs this DTC.

Scheme 113

The transmission control ECU receives signals from the main body ECU via CAN communication. When a lost CAN communication malfunction is detected, the transmission control ECU stores this DTC.

The indicator light comes on when the P position switch (transmission shift main switch) is pressed (the P position is engaged), goes off when the switch is released (the P position is disengaged) and blinks when a system malfunction occurs.

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1. CHECK P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH (INDICATOR LIGHT)) Turn the power switch on (IG). Depress the brake pedal and move the shift lever to N. Inspect the indicator light condition by operating the P position switch (transmission shift main switch). RESULT Condition of Indicator Light Proceed to Indicator light does not go off. (Remains on) A Indicator light does not come on. B Turn the power switch off. B --> See step 4 A: Go to next step
2. CHECK P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH (INDICATOR LIGHT)) Disconnect connector A35 from the transmission control ECU assembly. Turn the power switch on (IG). Inspect the indicator light condition by operating the P position switch (transmission shift main switch). RESULT Condition of Indicator Light Proceed to Comes on A Does not come on B NOTE: Turning the power switch on (IG) with the transmission control ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Connect the transmission control ECU assembly connector. B --> See step 7 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - P POSITION SWITCH) Disconnect connector A35 from the transmission control ECU assembly. Disconnect connector F1 from the P position switch (transmission shift main switch). Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Short) Tester Connection Switch Condition Specified Condition A35-20 (IND) or F1-7 (IND-) - Body ground and other terminals Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Transmission Control ECU Assembly) *2 Front view of wire harness connector (to P Position Switch (Transmission Shift Main Switch)) Connect the P position switch (transmission shift main switch) connector. Connect the transmission control ECU assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH)
4. CHECK HARNESS AND CONNECTOR (P POSITION SWITCH POWER SOURCE CIRCUIT) Disconnect connector from the P position switch (transmission shift main switch). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition F1-6 (IND+) - Body ground Power switch off 9 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to P Position Switch (Transmission Shift Main Switch)) Connect the P position switch (transmission shift main switch) connector. NG --> CHECK AND REPAIR POWER SOURCE CIRCUIT OK: Go to next step
5. INSPECT P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH) Disconnect connector from the P position switch (transmission shift main switch). Apply auxiliary battery voltage between terminals F1-6 (IND+) and F1-7 (IND-) and check the indicator light. Result Condition Specified Condition Auxiliary battery voltage applied between terminals F1-6 (IND+) and F1-7 (IND-) Comes on TEXT IN ILLUSTRATION *1 Component without harness connected (P Position Switch (Transmission Shift Main Switch)) HINT: Terminals No. 1 and No. 8 on the component side connector are empty. Connect the P position switch (transmission shift main switch) connector. NG --> REPLACE P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH) OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - P POSITION SWITCH) Disconnect connector A35 from the transmission control ECU assembly. Disconnect connector from the P position switch (transmission shift main switch). Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Switch Condition Specified Condition A35-20 (IND) - F1-7 (IND-) Power switch off Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Transmission Control ECU Assembly) *2 Front view of wire harness connector (to P Position Switch (Transmission Shift Main Switch)) Connect the P position switch (transmission shift main switch) connector. Connect the transmission control ECU assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
7. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY. Refer to «COMPONENTS»(ref-398214-S31258116822011051600000)

See also:
• COMPONENTS