SYSTEM DESCRIPTION — Part 1 Lexus RX II

SYSTEM DESCRIPTION

The ECM uses the signals from the throttle position sensor, air flow meter, turbine (input) speed sensor, intermediate (counter) shaft speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect a mechanical problems of the shift solenoid valve DSL, valve body and torque converter clutch.

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Torque converter lock-up is controlled by the ECM based on input turbine RPM (NT), counter gear RPM (NC), engine RPM, engine load, engine temperature, vehicle speed, transmission temperature, and gear selection. The ECM determines the lock-up status of the torque converter by comparing the engine RPM (NE) to the input turbine RPM (NT). The ECM calculates the actual transmission gear by comparing input turbine RPM (NT) to counter gear RPM (NC). When conditions are appropriate, the ECM requests "lock-up" by applying control voltage to shift solenoid DSL. When opened, solenoid DSL applies pressure to the lock-up relay valve and locks the torque converter clutch. If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the ECM interprets this as a fault in the torque converter clutch performance. The ECM will turn on the MIL.

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The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves and valve body.

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The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and the actual gear position are not same, the ECM illuminates the MIL.

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OFF malfunction

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ON malfunction (A)

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ON malfunction (B)

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1. INSPECT SHIFT SOLENOID VALVE (SL1) Remove the shift solenoid valve SL1. Measure the resistance according to the value(s) in the table below. Standard: Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve. Standard: The solenoid makes an operating noise. OK: GO TO NEXT STEP. NG: REPLACE SHIFT SOLENOID VALVE (SL1)
2. INSPECT TRANSMISSION VALVE BODY ASSY (See chapter 2 in «PROBLEM SYMPTOMS TABLE»(ref-209546-S11825380642005121000000) ) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY (See «REPLACEMENT»(ref-209590-S05223735902005121000000) )
3. INSPECT TORQUE CONVERTER CLUTCH ASSY (See «TORQUE CONVERTER CLUTCH AND DRIVE PLATE (ATM)»(ref-209590-S35507545572005121000000) ) OK: REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (See «AUTOMATIC TRANSAXLE ASSY (U151E/U151F)»(ref-209590-S25711046832005121000000) ) NG: REPLACE TORQUE CONVERTER CLUTCH ASSY

The ECM commands gearshift by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and the MIL comes on. Illuminating the MIL, the ECM performs the fail-safe and turns the other shift solenoid valves in good condition "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit).

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1. INSPECT TRANSMISSION WIRE (SL1) Disconnect the transmission wire connector from the transaxle. Measure the resistance according to the value(s) in the table below. Standard: Measure the resistance according to the value(s) in the table below. Standard (Check for short): OK: GO TO NEXT STEP. NG: Go to step 3
2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) Connect the transmission connector to the transaxle. Disconnect the connector from the ECM. Measure the resistance according to the value(s) in the table below. Standard: Measure the resistance according to the value(s) in the table below. Standard (Check for short): OK: REPLACE ECM (See ECM (3MZ-FE) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-215923-S29911983652006011900000) )
3. INSPECT SHIFT SOLENOID VALVE (SL1) Remove the shift solenoid valve SL1. Measure the resistance according to the value(s) in the table below. Standard: Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve. Standard: The solenoid makes an operating noise. OK: REPAIR OR REPLACE TRANSMISSION WIRE (See «TRANSMISSION WIRE (U151E/U151F)»(ref-209590-S29192554212005121000000) ) NG: REPLACE SHIFT SOLENOID VALVE (SL1)

The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves and valve body.

Scheme 112

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and the actual gear position are not same, the ECM illuminates the MIL.

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ALL

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OFF malfunction (A)

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OFF malfunction (B)

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ON malfunction (A)

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ON malfunction (B)

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1. INSPECT SHIFT SOLENOID VALVE (S4) Remove the shift solenoid valve S4. Measure the resistance according to the value(s) in the table below. Standard: Connect positive (+) lead to the terminal of solenoid connector, negative (-) lead to the solenoid body. Standard: The solenoid makes an operating noise. OK: GO TO NEXT STEP. NG: REPLACE SHIFT SOLENOID VALVE (S4)
2. INSPECT TRANSMISSION VALVE BODY ASSY (See chapter 2 in «PROBLEM SYMPTOMS TABLE»(ref-209546-S11825380642005121000000) ) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY (See «TRANSMISSION VALVE BODY ASSY (U151E/U151F)»(ref-209590-S36275406272005121000000) )
3. INSPECT TORQUE CONVERTER CLUTCH ASSY (See «TORQUE CONVERTER CLUTCH AND DRIVE PLATE (ATM)»(ref-209590-S35507545572005121000000) ) OK: REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (See «AUTOMATIC TRANSAXLE ASSY (U151E/U151F)»(ref-209590-S25711046832005121000000) ) NG: REPLACE TORQUE CONVERTER CLUTCH ASSY

The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves and valve body.

Scheme 123

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL.

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ALL

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OFF malfunction (A)

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OFF malfunction (B)

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ON malfunction (A)

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ON malfunction (B)

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ON malfunction (C)

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ON malfunction (D)

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1. INSPECT SHIFT SOLENOID VALVE (SR) Remove the shift solenoid valve SR. Measure the resistance according to the value(s) in the table below. Standard: Connect positive (+) lead to the terminal of solenoid connector, negative (-) lead to the solenoid body. Standard: The solenoid makes an operating noise. OK: GO TO NEXT STEP. NG: REPLACE SHIFT SOLENOID VALVE (SR)
2. INSPECT TRANSMISSION VALVE BODY ASSY (See chapter 2 in «PROBLEM SYMPTOMS TABLE»(ref-209546-S11825380642005121000000) ) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY (See «TRANSMISSION VALVE BODY ASSY (U151E/U151F)»(ref-209590-S36275406272005121000000) )
3. INSPECT TORQUE CONVERTER CLUTCH ASSY (See «TORQUE CONVERTER CLUTCH AND DRIVE PLATE (ATM)»(ref-209590-S35507545572005121000000) ) OK: REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (See «AUTOMATIC TRANSAXLE ASSY (U151E/U151F)»(ref-209590-S25711046832005121000000) ) NG: REPLACE TORQUE CONVERTER CLUTCH ASSY

The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves and valve body.

Scheme 136

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and the actual gear position are not same, the ECM illuminates the MIL.

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ALL

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OFF malfunction (A)

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OFF malfunction (B)

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OFF malfunction (C)

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OFF malfunction (D)

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ON malfunction (A)

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ON malfunction (B)

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ON malfunction (C)

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1. INSPECT SHIFT SOLENOID VALVE (SL2) Remove the shift solenoid valve SL2. Measure the resistance according to the value(s) in the table below. Standard: Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve. Standard: The solenoid makes an operating noise. OK: GO TO NEXT STEP. NG: REPLACE SHIFT SOLENOID VALVE (SL2)
2. INSPECT TRANSMISSION VALVE BODY ASSY (See chapter 2 in «PROBLEM SYMPTOMS TABLE»(ref-209546-S11825380642005121000000) ) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY (See «TRANSMISSION VALVE BODY ASSY (U151E/U151F)»(ref-209590-S36275406272005121000000) )
3. INSPECT TORQUE CONVERTER CLUTCH ASSY (See «TORQUE CONVERTER CLUTCH AND DRIVE PLATE (ATM)»(ref-209590-S35507545572005121000000) ) OK: REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (See «AUTOMATIC TRANSAXLE ASSY (U151E/U151F)»(ref-209590-S25711046832005121000000) ) NG: REPLACE TORQUE CONVERTER CLUTCH ASSY

The ECM commands gearshift by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and the MIL comes on. Illuminating the MIL, the ECM performs the fail-safe and turns the other shift solenoid valves in good condition "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit).

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1. INSPECT TRANSMISSION WIRE (SL2) Disconnect the transmission wire connector from the transaxle. Measure the resistance according to the value(s) in the table below. Standard: Measure the resistance according to the value(s) in the table below. OK: Standard (Check for short): OK: GO TO NEXT STEP. NG: Go to step 3
2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) Connect the transmission connector to the transaxle. Disconnect the connector from the ECM. Measure the resistance according to the value(s) in the table below. Standard: Measure the resistance according to the value(s) in the table below. OK: Standard (Check for short): OK: REPLACE ECM (See ECM (3MZ-FE) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-215923-S29911983652006011900000) )
3. INSPECT SHIFT SOLENOID VALVE (SL2) Remove the shift solenoid valve SL2. Measure the resistance according to the value(s) in the table below. Standard: Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve. Standard: The solenoid makes an operating noise. OK: REPAIR OR REPLACE TRANSMISSION WIRE (See «TRANSMISSION WIRE (U151E/U151F)»(ref-209590-S29192554212005121000000) ) NG: REPLACE SHIFT SOLENOID VALVE (SL2)

The NC terminal of ECM detects the counter gear speed sensor's revolving signal (output RPM). The ECM outputs a gearshift signal comparing the input turbine speed sensor (NT) with the counter gear speed sensor (NC).

When the ECM detects this code abnormally, the ECM performs the fail-safe and outputs a gearshift signal based on the signal from the input turbine speed sensor (NT).

While the vehicle is operating in the 2nd, 3rd, 4th or 5th gear position in the shift position of D, if the counter gear revolution is less than 300 RPM although the output shaft revolution is more than 1,000 RPM, the ECM detects the trouble.

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