Active Control Engine Mount System (Diagnostics - Introduction): Diagnosis Lexus ES XV40 facelift

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use this procedure to troubleshoot the active engine mounting system.
2. Techstream should be used in steps 2, 6 and 7.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS NEXT: Go to next step
3. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
4. CHECK AND CLEAR DTCS Refer to the DTC CHECK / CLEAR. Refer to «DTC CHECK / CLEAR»(ref-396641-S14208775922011050900000) . NEXT: Go to next step
5. VISUAL INSPECTION NEXT: Go to next step
6. PERFORM ACTIVE TEST Connect Techstream to the DLC3. Start the engine. Select the item "Powertrain / E-ACM / Active Test / Check the E-ACM". NEXT: Go to next step
7. CHECK FOR DTC Check for DTCs and note any codes that are output. Delete the DTC. Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests. Result Result Proceed to DTC does not reoccur A DTC reoccurs B B --> GO TO «DIAGNOSTIC TROUBLE CODE CHART»(ref-396641-S39726722912011050900000) DTC CHART A: Go to next step
8. OVERALL ANALYSIS AND TROUBLESHOOTING Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-396641-S30595422882011050900000) . NEXT: Go to next step
9. ADJUST, REPAIR OR REPLACE NEXT: Go to next step
10. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

When a malfunction is not confirmed by a DTC (Diagnostic Trouble Code) check and the cause of problem cannot be identified through a basic inspection, troubleshoot according to the priority order indicated in the table below.

ACTIVE CONTROL ENGINE MOUNT SYSTEM

Scheme 391

Scheme 392

Scheme 393

Scheme 394

Scheme 395

1. Waveform 1 Active control engine mount actuator signal Symbols (Terminal No.) Between ACT+ and ACT- Tool Setting 5 V/DIV., 10 ms./DIV. Condition Idling with warm engine HINT: The duty ratio varies depending on the active control engine mount actuator operation. Do not disconnect the active control engine mount ECU connector.
2. Waveform 2 Engine speed signal Symbols (Terminal No.) Between TACH and GND Tool Setting 5 V/DIV., 10 ms./DIV. Condition Idling HINT: The wavelength becomes shorter as the engine rpm increases.
3. Waveform 3 CAN communication signal Symbols (Terminal No.) Between CANH and GND Tool Setting 1 V/DIV., 10 μs/DIV. Condition Stop engine and engine switch on (IG) HINT: The waveform varies depending on the CAN communication signal.
4. Waveform 4 CAN communication signal Symbols (Terminal No.) Between CANL and GND Tool Setting 1 V/DIV., 10 μs/DIV. Condition Stop engine and engine switch on (IG) HINT: The waveform varies depending on the CAN communication signal.

Scheme 396

1. DESCRIPTION The active control engine mount ECU controls the functions of the CAN communication system on the vehicle. Data of the CAN communication system and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle.
2. CHECK DLC3 The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAEJ 1962 and matches the ISO 15765-4 format. Symbols Terminal No. Names Reference terminal Results Condition SIL 7 Bus "+" line 5 - Signal ground Pulse generation During transmission CG 4 Chassis ground Body ground 1 ohms or less Always SG 5 Signal ground Body ground 1 ohms or less Always BAT 16 Battery ground Body ground 9 to 14 V Always CANH 6 CAN "High" line CANL 54 to 69 ohms Engine switch off CANH 6 CAN "High" line Battery positive 6 kohms or higher Engine switch off CANH 6 CAN "High" line CG 200 ohms or higher Engine switch off CANL 14 CAN "Low" line Battery positive 6 kohms or higher Engine switch off CANL 14 CAN "Low" line CG 200 ohms or higher Engine switch off HINT: The DLC3 is the interface prepared for reading various data from the vehicle's ECU. After connecting the cable of Techstream, turn the engine switch on (IG) and turn the tester on. If a communication failure message is displayed on the tester screen, a problem exists in either the vehicle or tester. In order to identify the location of the problem, connect the tester to another vehicle. If communication is normal: Inspect the DLC3 on the original vehicle. If communication is still not possible: The problem is probably in the tester itself. Consult the Service Department listed in the instruction manual. Techstream HINT: Connect the cable of Techstream to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
3. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding.

DTC CHECK / CLEAR

1. CHECK DTC Connect Techstream to the DLC3. Turn the engine switch on (IG). Enter the following menus: Powertrain / E-ACM / Trouble Codes. Check the DTCs on the tester screen. HINT: Refer to the Techstream operator's manual for further details.
2. CLEAR DTC Connect Techstream to the DLC3. Turn the engine switch on (IG). Erase the DTCs by following the prompts on the tester screen. Enter the following menus: Powertrain / E-ACM / Trouble Codes. Erase the DTC. HINT: Refer to the Techstream operator's manual for further details.

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using Techstream Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to shorten labor time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Warm up the engine. Turn the engine switch off. Connect Techstream together to the DLC3. Turn the engine switch on (IG). Turn on the tester. Select the item "Powertrain / E-ACM / Data List". According to the display on the tester, read the "Data List". Tester Display Measurement Item/Range Normal Condition Diagnostic Note G Sensor Output Vol (1x) Acceleration sensor value/ Min.: 0 V Max.: 5 V 0.11 to 4.46 V - G Sensor Output Vol (11x) Acceleration sensor value (x11)/ Min.: 0 V Max.: 5 V 0 to 5 V (varies constantly) 11 times amplified value of the difference between the acceleration sensor output value and the acceleration sensor reference voltage. G Sensor Standard Voltage Acceleration sensor standard voltage/ Min.: 0 V Max.: 5 V Engine switch on (IG): 1.94 to 3.08 V Voltage that the ECU determines as the standard value for the 11-fold amplifier circuit to operate. IPD Operation Signal IPD operation signal/ ON or OFF - Condition of the operation signal of the component (IPD: Intelligent Power Device) that configures the linear solenoid drive circuit in the ECU. IPD Diagnosis IPD diagnosis/ ON or OFF - Condition of diagnostic signals output from the IPD. FET Operation Signal FET operation signal/ ON or OFF OFF Condition of the operation signal of the component (FET: Field-Effect Transistor) that configures the linear solenoid drive circuit in the ECU. FET Output Signal FET output signal/ ON or OFF - Signal that indicates the FET1 output condition. +B Voltage +B voltage/ Min.: 0 V Max.: 20 V Always: 10 to 14 V - IG Voltage IG voltage/ Min.: 0 V Max.: 20 V Engine switch on (IG): 10 to 14 V - Vehicle Speed Vehicle speed/ Min.: 0 km/h (0 mph) Max.: 327 km/h (203 mph) Actual vehicle speed - Coolant Temp Engine coolant temperature/ Min.: -40°C (-40°F) Max.: 140°C (284°F) After warming up: 80 to 100°C (176 to 212°F) - Engine Load Engine load/ Min.: 0 % Max.: 160 % Idling: 10 to 30 % - Shift Position D D range status/ ON or OFF Shift lever is in D position: ON Shift lever position is in any position except D: OFF - Shift Position N N range status/ ON or OFF Shift lever is in N position: ON Shift lever position is in any position except N: OFF - Shift Position R R range status/ ON or OFF Shift lever is in R position: ON Shift lever position is in any position except R: OFF - Shift Position P P range status/ ON or OFF Shift lever is in P position: ON Shift lever position is in any position except P: OFF - Engine Run Switch Engine run switch/ ON or OFF Engine running: ON Engine off: OFF - Engine Frequency Engine frequency/ Min.: 0 Hz Max.: 100 Hz Idling: 28 to 38 HZ - G Sensor Judge Acceleration sensor judge / OK or NG OK A malfunction is detected in the acceleration sensor. Actuator Judge Actuator (Including acceleration sensor) judge / OK or NG OK A malfunction is detected in the actuator or acceleration sensor. Battery Judge Battery judge / OK or NG OK A malfunction is detected in the battery. TACH Judge Tacho signal judge / OK or NG OK An abnormal TACH signal is detected. HS CAN Comm Bus Judge High speed CAN communication bus judge / OK or NG OK A malfunction in the CAN communication. ACM Active Status Active control engine mount active status / ON or OFF - The active control engine mount ECU is controlling the active control mount: ON The active control engine mount ECU is not controlling the active control mount: OFF ACM Active Enable Active control engine mount active enable / ON or OFF ON Whether the active control engine mount ECU functions normally or malfunctions is indicated. (ON: functions normally, OFF: malfunctioning) +B Low Voltage Status +B low voltage status / ON or OFF OFF Low +B voltage (less than 10 V) is indicated. (ON: low voltage, OFF: normal voltage) Ambient Temperature Ambient temperature value / Min.: -40°C, Max.: 50°C Actual ambient temperature - #Codes Diagnosis code / Min.: 0, Max.: 5 0 A total of the past DTCs and current DTCs.
2. ACTIVE TEST HINT: Performing the Active Test using Techstream allows the actuator and so on to operate without parts removal. Performing the Active Test as the first step in troubleshooting is one method to shorten labor time. It is possible to display the Data List during the Active Test. Warm up the engine. Turn the engine switch off. Connect Techstream to the DLC3. Turn the engine switch on (IG). Push the "ON" button of Techstream. Select the item "Powertrain / E-ACM / Active Test". According to the display on the tester, perform the "Active Test". Tester Display Test Part Control Range Diagnostic Note Check the E-ACM Operate the E-ACM actuator. ON / OFF [Vehicle Condition] Engine running

DIAGNOSTIC TROUBLE CODE CHART

If any trouble code is displayed during DTC check, check the circuit corresponding to the code in the table below. Proceed to the article given for the circuit.

ACTIVE ENGINE MOUNTING