Hybrid Control (Diagnostic Codes (P0AA6-526 - U0424-537) & Circuit Tests): Overview Lexus HS I

DESCRIPTION

The hybrid vehicle control ECU monitors the battery smart unit and detects insulation malfunctions in the high-voltage system.

HINT

1. *1: INF code 526 is stored together with P0AA6.
2. If DTC P0AA6 is stored, the vehicle cannot start.
3. When measuring insulation resistance using a megohmmeter, measure the resistance while jiggling the high voltage wire harness.

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TEXT IN ILLUSTRATION

SYSTEM DESCRIPTION

HINT

If a decrease in insulation resistance cannot be confirmed using a megohmmeter, check the Short Wave Highest Val in the Data List.

1. Characteristics of Short Wave Highest Value The Data List item Short Wave Highest Val and insulation resistance have the relationship shown in the table below. Short Wave Highest Val decreases with a decrease in insulation resistance. However, in some cases, even though the insulation resistance of the vehicle is normal, Short Wave Highest Val may decrease. Therefore, check Short Wave Highest Val while considering the following. Do not check until approximately 1 minute has passed after the power switch is turned on (IG) (A). Do not check when there is a difference between the system voltages (HV battery voltage, VL-Voltage before boosting, and VH-Voltage after boosting) (B). Short Wave Highest Value Trouble Area Neither condition (A) nor (B) is met and Short Wave Highest Val is approximately 0 V Since the insulation resistance is close to 0 ohms, there is a strong possibility of interference with a metal object. Neither condition (A) nor (B) is met and Short Wave Highest Val is between 0 and 5 V Since the insulation resistance is several hundred kiloohms, there is a strong possibility of the presence of fluid such as coolant.
2. How to Determine Part with Insulation Malfunction Jiggle the high-voltage wire harness to check if the resistance to body ground changes with the position of the wire harness or force applied. Repeat rotating and stopping of the MG1, MG2 and compressor with motor. Check that the Short Wave Highest Val does not decrease (for example, if the motor stops with foreign matter forming a leak path) when the motor stops, or that the Short Wave Highest Val does not return to normal (for example, if foreign matter moves away from the leak path) when the motor rotates. Increase the temperature of MG1, and MG2. Check if the Short Wave Highest Val decreases with the temperature increase.

The hybrid vehicle control ECU monitors the insulation monitoring circuit located in the battery smart unit and detects a malfunction.

MONITOR DESCRIPTION

The hybrid vehicle control ECU detects malfunctions of the battery current sensor by monitoring MG1 and MG2 torque. If the hybrid vehicle control ECU detects a battery current sensor malfunction, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

Refer to the circuit description for DTC P0AE6-225. Refer to DESCRIPTION .

If SMRG is stuck open, P0AE0-228 will usually be set. P0AE2-161 is used to pinpoint the problem more quickly and accurately.

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

The SMRs (System Main Relay) are the relays that connect or disconnect the high voltage power system in accordance with commands from the hybrid vehicle control ECU.

The SMR system is composed of three SMRs and one system main resistor. SMRB and SMRG are located on the hybrid battery junction block assembly in the battery carrier under the HV battery. SMRP and the system main resistor are located in the hybrid vehicle converter (DC/DC converter) assembly in the battery carrier.

To connect to the high voltage power system, the vehicle will first turn on SMRP and SMRB to charge the vehicle through the system main resistor. Then, SMRP will be turned off after the SMRG is turned on. To shut off the high voltage power system, SMRB and SMRG are turned off.

When there is an open in the AMD line or IGCT line, the following DTCs are output

P0AE6-225 is output first because the time required for diagnosis is the shortest.

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Refer to the circuit description for DTC P0AE6-225. Refer to DESCRIPTION

1. The MG ECU located in the inverter with converter assembly detects the temperature of the motor inverter using the temperature sensor built into the motor inverter. If necessary, the MG ECU will limit inverter output to help prevent motor inverter overheating. The hybrid vehicle control ECU also detects malfunctions in the sensor based on the temperature sensor values. The inverter with converter assembly detects malfunctions in the motor inverter temperature sensor and its wiring.

1. The MG ECU located in the inverter with converter assembly detects the temperature of the motor inverter using a temperature sensor built into the inverter with converter assembly. The inverter cooling system operates independently of the engine cooling system. The MG ECU uses signals from the motor inverter temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the MG ECU will limit inverter output to help prevent inverter overheating. The MG ECU also detects malfunctions in the motor inverter temperature sensor and its wiring.

The hybrid vehicle control ECU monitors its internal operation, it will set DTCs and perform fail-safe control when it detects the following malfunctions.

Refer to the description for DTC P0A78-266. Refer to DESCRIPTION .

HINT

When the power switch is turned off, the MG ECU applies current to MG2 in a way that does not generate torque, in order to discharge the residual voltage in the inverter. When the hybrid system is normal, the VH value is almost 0 V after discharge. This DTC will be stored if the VH value is more than the specified value after discharge.

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The MG ECU located in the inverter with converter assembly detects the temperature of the reactor using a temperature sensor built into the inverter with converter assembly. The inverter cooling system is the same as that for MG2 or MG1, and operates independently of the engine cooling system. The MG ECU limits the load based on signals sent from the reactor temperature sensor in order to check the effect of the inverter cooling system and prevent overheating. The ECU also detects malfunctions in the reactor temperature sensor.

HINT

The reactor is a component with characteristics that resist changes in the current flow. The reactor will attempt to maintain the current flow. This characteristic stabilizes the current flowing to the HV battery. The reactor is also used to boost the battery voltage which is supplied to the inverters.

The hybrid vehicle control ECU receives a signal that indicates a collision from the airbag sensor assembly to detect a collision. After detecting a collision, the hybrid vehicle control ECU shuts off the high voltage systems for safety.

HINT

If P1606-308 or 317 is output, the vehicle cannot start unless the DTCs are cleared using the Techstream.

The accelerator pedal position sensor is mounted on the accelerator pedal to detect how much the pedal is depressed. This is a non-contact sensor with hall elements. There are 2 outputs from the sensor. One is used to detect the accelerator pedal position and the other is used as a confirmation to allow the detection of a malfunction in the sensor itself. Voltage is output from the accelerator pedal position sensor to terminals VPA and VPA2 of the hybrid vehicle control ECU. This voltage varies from 0 to 5 V in accordance with the accelerator pedal position. Terminal VPA2 is primarily used to detect a malfunction in the sensor itself. The hybrid vehicle control ECU determines the current accelerator pedal position and controls the hybrid control system based on signals received by terminals VPA and VPA2.

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1. READ VALUE USING TECHSTREAM (ACCEL PEDAL POS #1, ACCEL PEDAL POS #2) Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Hybrid Control / Data List / Accel Pedal Pos #1, Accel Pedal Pos #2. Read the Data List. Result Tester Display Accelerator Pedal Condition Specified Condition Accel Pedal Pos #1 Not depressed 8 to 28% (0.4 to 1.4 V) Fully depressed 62 to 92% (3.1 to 4.6 V) Not depressed --> Fully depressed --> Not depressed (Accelerator pedal should be operated slowly) Value changes progressively as shown in the illustration Accel Pedal Pos #2 Not depressed 20 to 44% (1.0 to 2.2 V) Fully depressed 78 to 100% (3.9 to 5.0 V) Not depressed --> Fully depressed --> Not depressed (Accelerator pedal should be operated slowly) Value changes progressively as shown in the illustration TEXT IN ILLUSTRATION *a Accelerator Pedal Sensor Assembly Output Voltage (V) *b Accelerator Pedal Fully Released *c Accelerator Pedal Fully Depressed *d Accelerator Pedal Turning Angle (°) HINT: 5 V is described as 100% on the Techstream. Turn the power switch off. NG --> See step 2 OK --> See step 10
2. CHECK CONNECTOR CONNECTION CONDITION (ACCELERATOR PEDAL SENSOR ASSEMBLY CONNECTOR) Check the connection of accelerator pedal sensor assembly connector. TEXT IN ILLUSTRATION *A except Sport Package *B for Sport Package OK The connector is connected securely and there are no contact problems. NG --> CONNECT SECURELY OK: Go to next step
3. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR). Refer to «PROCEDURE - Step 3»(ref-398238-S22715658692011051600000) NG --> CONNECT SECURELY OK: Go to next step
4. CHECK HYBRID VEHICLE CONTROL ECU (CHECK VOLTAGE) Disconnect connector from the accelerator pedal sensor assembly. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A23-4 (VCPA) - A23-5 (EPA) Power switch on (IG) 4.5 to 5.5 V A23-1 (VCP2) - A23-2 (EPA2) Power switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Accelerator Pedal Sensor Assembly) Connect the accelerator pedal sensor assembly connector. Turn the power switch off. NG --> See step 7 OK: Go to next step
5. CHECK HYBRID VEHICLE CONTROL ECU (CHECK RESISTANCE) Disconnect connector from the accelerator pedal sensor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition A23-6 (VPA) - A23-5 (EPA) Power switch off 36.60 to 41.61 kohms A23-3 (VPA2) - A23-2 (EPA2) Power switch off 36.60 to 41.61 kohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Accelerator Pedal Sensor Assembly) Connect the accelerator pedal sensor assembly connector. NG --> See step 6 OK --> See step 8
6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ACCELERATOR PEDAL SENSOR) Disconnect connector from the accelerator pedal sensor assembly. Disconnect connector A58 from the hybrid vehicle control ECU. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A58-106 (VPA) - Body ground Power switch on (IG) Below 1 V A58-105 (VPA2) - Body ground Power switch on (IG) Below 1 V A58-88 (EP1) - Body ground Power switch on (IG) Below 1 V A58-87 (EP2) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) *2 Front view of wire harness connector (to Accelerator Pedal Sensor Assembly) NOTE: Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check For Open) Tester Connection Switch Condition Specified Condition A58-106 (VPA) - A23-6 (VPA) Power switch off Below 1 ohms A58-88 (EP1) - A23-5 (EPA) Power switch off Below 1 ohms A58-105 (VPA2) - A23-3 (VPA2) Power switch off Below 1 ohms A58-87 (EP2) - A23-2 (EPA2) Power switch off Below 1 ohms Standard Resistance (Check For Short) Tester Connection Switch Condition Specified Condition A58-106 (VPA) or A23-6 (VPA) - Body ground and other terminals Power switch off 10 kohms or higher A58-88 (EP1) or A23-5 (EPA) - Body ground and other terminals Power switch off 10 kohms or higher A58-105 (VPA2) or A23-3 (VPA2) - Body ground and other terminals Power switch off 10 kohms or higher A58-87 (EP2) or A23-2 (EPA2) - Body ground and other terminals Power switch off 10 kohms or higher Connect the hybrid vehicle control ECU connector. Connect the accelerator pedal sensor assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ACCELERATOR PEDAL SENSOR) Disconnect connector from the accelerator pedal sensor assembly. Disconnect connector A58 from the hybrid vehicle control ECU. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A58-108 (VCP1) - Body ground Power switch on (IG) Below 1 V A58-88 (EP1) - Body ground Power switch on (IG) Below 1 V A58-107 (VCP2) - Body ground Power switch on (IG) Below 1 V A58-87 (EP2) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) *2 Front view of wire harness connector (to Accelerator Pedal Sensor Assembly) NOTE: Turning the power switch on (IG) with the hybrid vehicle Control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check For Open) Tester Connection Switch Condition Specified Condition A58-108 (VCP1) - A23-4 (VCPA) Power switch off Below 1 ohms A58-88 (EP1) - A23-5 (EPA) Power switch off Below 1 ohms A58-107 (VCP2) - A23-1 (VCP2) Power switch off Below 1 ohms A58-87 (EP2) - A23-2 (EPA2) Power switch off Below 1 ohms Standard Resistance (Check For Short) Tester Connection Switch Condition Specified Condition A58-108 (VCP1) or A23-4 (VCPA) - Body ground and other terminals Power switch off 10 kohms or higher A58-88 (EP1) or A23-5 (EPA) - Body ground and other terminals Power switch off 10 kohms or higher A58-107 (VCP2) or A23-1 (VCP2) - Body ground and other terminals Power switch off 10 kohms or higher A58-87 (EP2) or A23-2 (EPA2) - Body ground and other terminals Power switch off 10 kohms or higher Connect the hybrid vehicle control ECU connector. Connect the accelerator pedal sensor assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
8. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY. Refer to «COMPONENTS»(ref-398232-S42133119942011051600000)
9. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to «COMPONENTS»(ref-398232-S05375191312011051600000)
10. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-398094-S05300073002011051600000)

The hybrid vehicle control ECU monitors the +B power source voltage to detect an instantaneous interruption.

The hybrid vehicle converter (DC/DC converter) sends IDH signals to the hybrid vehicle control ECU to inform the ECU of the cooling fan operation condition and the output current limitation condition due to overheating.

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If a hybrid vehicle cannot be turned off, it will not be possible to determine that the vehicle cannot be turned off by listening or looking (high voltage cannot be shut off). In this case, checking for DTCs can help to determine the state of the vehicle.

When the hybrid vehicle control ECU detects that the vehicle cannot be turned off, the ECU will set this DTC. This DTC is set based on communication between the hybrid vehicle control ECU and ECUs that are activated by the IG1 relay and IG2 relay.

HINT

If DTC P2532-772 is stored, the vehicle will turn off.

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The hybrid vehicle control ECU detects the MG1 and MG2 temperature based on signals from the generator and motor temperature sensors and activates the OIL PMP relay and oil pump driver (oil pump with motor assembly).

The hybrid vehicle control ECU monitors OPST signals from the oil pump driver and detects malfunctions.

The oil pump with motor assembly is activated when

1. MG1 temperature is 176°F (80°C) or more

2. MG2 temperature is 212°F (100°C) or more and the MG1 temperature is 158°F (70°C) or more

HINT

The oil pump with motor assembly cannot be activated only with the OIL PMP relay on. It is activated after receiving the command signals (OPM1) from the hybrid vehicle control ECU.

Scheme 15

Refer to the description for DTC P2601-777. Refer to DESCRIPTION .

Refer to the description for DTC P2601-777. Refer to DESCRIPTION .

Refer to the description for DTC P2601-777. Refer to DESCRIPTION .

Refer to the description for DTC P2601-777. Refer to DESCRIPTION .

The hybrid vehicle control ECU alerts the driver and performs fail-safe control based on error signals received from the battery smart unit. This DTC is set when the SOC (state of charge) of the HV battery starts to drop as a result of leaving neutral (N) selected, running out of fuel, or a malfunction in the hybrid control system.

The hybrid vehicle control ECU alerts the driver and performs fail-safe control based on error signals received from the battery smart unit.

This DTC is set if the HV battery is discharged excessively or the hybrid control system malfunctions.

HINT

If the HV battery voltage has dropped due to a malfunction in other components such as the inverter with converter assembly or the hybrid vehicle transmission assembly, recharging the HV battery will restore the voltage. If the HV battery voltage has dropped excessively after the vehicle was left for a long time, the HV battery will need to be replaced.

The hybrid vehicle control ECU monitors its internal operation and detects the following malfunction.

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

The power management control ECU monitors the high-voltage wiring between the HV battery and the inverter with converter assembly, and detects the following malfunction.

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

The hybrid vehicle control ECU monitors its internal operation, it will set DTCs and perform fail-safe control when it detects the following malfunctions.

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

Refer to the description for DTC P0AE6-225. Refer to DESCRIPTION .

1. The hybrid vehicle control ECU detects a problem in the collision signal line from the airbag sensor assembly and alerts the driver.

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1. CHECK DTC OUTPUT (AIRBAG) Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Body Electrical / SRS Airbag / Trouble Codes. Check if DTCs are output. Result Result Proceed to Airbag system DTCs are not output. A Airbag system DTCs are output. B Turn the power switch off. B --> See step 10 A: Go to next step
2. CHECK AIRBAG SENSOR ASSEMBLY (CHECK WAVEFORM) Turn the power switch on (READY). Connect an oscilloscope between the airbag sensor assembly terminals specified in the table below, and measure the waveform. Item Contents Terminal F34-14 (GSW2) - F34-25 (E1) Equipment Setting 5 V/DIV., 500 ms./DIV. Condition Power switch on (READY) Result Result Proceed to The waveform appears as shown in the illustration (Scheme 17). A The waveform differs from the one shown in the illustration (Scheme 17). B TEXT IN ILLUSTRATION *1 Component with harness connected (Airbag Sensor Assembly) Turn the power switch off. B --> See step 6 A: Go to next step
3. CLEAR DTC. Refer to «PROCEDURE - Step 5»(ref-398238-S22227180842011051600000) NEXT: Go to next step
4. CHECK DTC OUTPUT (HV) Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. Check if DTCs are output. Result Result Proceed to DTC P3107-213 is not output. A DTC P3107-213 is output. B Turn the power switch off. B --> See step 8 A: Go to next step
5. CHECK FOR INTERMITTENT PROBLEMS Check for intermittent problems. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-398094-S05300073002011051600000). NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK --> See step 8
6. CHECK AIRBAG SENSOR ASSEMBLY Disconnect connector F34 from the airbag sensor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition F34-14 (GSW2) - F34-25 (E1) Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Airbag Sensor Assembly) Connect the airbag sensor assembly. NG --> See step 9 OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - AIRBAG SENSOR ASSEMBLY) Disconnect connector A58 from the hybrid vehicle control ECU. Disconnect connector F34 from the airbag sensor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition A58-73 (ABFS) or F34-14 (GSW2) - Body ground and other terminals Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) *2 Rear view of wire harness connector (to Airbag Sensor Assembly) Connect the airbag sensor assembly. Connect the hybrid vehicle control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
8. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to «COMPONENTS»(ref-398232-S05375191312011051600000)
9. REPLACE AIRBAG SENSOR ASSEMBLY. Refer to «COMPONENTS»(ref-398090-S28364296632011051600000)
10. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-398246-S23494487152011051600000)

1. Refer to the description for DTC P3107-213. Refer to «DESCRIPTION»(ref-398092-S17146753562011051600000) .

Refer to the description for DTC P3107-213. Refer to DESCRIPTION .

1. The hybrid vehicle control ECU detects a wiring malfunction in the serial communication line between it and the compressor with motor assembly.

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1. CHECK DTC OUTPUT (HV) Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. Check if DTCs are output. Result Result Proceed to DTC P3108-535, 536 or 538 only is output. A Any of the following DTCs are also output. B DTC No. Relevant Diagnosis P0ADC-226 Hybrid Battery Positive Contactor Control Circuit High P0AE0-228 Hybrid Battery Negative Contactor Control Circuit High NOTE: P3108-535, 536 or 538 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output. After troubleshooting and repairing all output DTCs, be sure to replace the inverter with converter assembly. Turn the power switch off. B --> See step 14 A: Go to next step
2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR). Refer to «PROCEDURE - Step 3»(ref-398238-S22715658692011051600000) NG --> CONNECT SECURELY OK: Go to next step
3. CHECK CONNECTOR CONNECTION CONDITION (COMPRESSOR WITH MOTOR ASSEMBLY CONNECTOR) Disconnect connector C26 from the compressor with motor assembly. OK The connector is connected securely and there are no contact problems. NG --> CONNECT SECURELY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY POWER SOURCE CIRCUIT) Disconnect connector C26 from the compressor with motor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition C26-5 (GND) - Body ground Power switch off Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Compressor with Motor Assembly) Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C26-6 (IG1) - C26-5 (GND) Power switch on (IG) 11 to 14 V NOTE: Turning the power switch on (IG) with the compressor with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Connect the compressor with motor assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK DTC OUTPUT (HV) Connect the Techstream to the DLC3. Turn the power switch on (READY). Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. Check if DTCs are output. Result Result Proceed to DTC P3108-535 is output. A DTC P3108-538 is not output, DTC P3108-536 is output. DTC P3108-535 is not output, DTC P3108-538 is output. B Turn the power switch off. B --> See step 9 A: Go to next step
6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY) Disconnect connector C28 from the hybrid vehicle control ECU. Disconnect connector C26 from the compressor with motor assembly. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C28-18 (CLK) - Body ground Power switch on (IG) Below 1 V C28-20 (ITE) - Body ground Power switch on (IG) Below 1 V C28-19 (ETI) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) *2 Front view of wire harness connector (to Compressor with Motor Assembly) NOTE: Turning the power switch on (IG) with the hybrid vehicle control ECU connector and the compressor with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Switch Condition Specified Condition C28-18 (CLK) - C26-1 (CLK) Power switch off Below 1 ohms C28-20 (ITE) - C26-2 (DIN) Power switch off Below 1 ohms C28-19 (ETI) - C26-3 (DOUT) Power switch off Below 1 ohms Standard Resistance (Check for Short) Tester Connection Switch Condition Specified Condition C28-18 (CLK) or C26-1 (CLK) - Body ground and other terminals Power switch off 10 kohms or higher C28-20 (ITE) or C26-2 (DIN) - Body ground and other terminals Power switch off 10 kohms or higher C28-19 (ETI) or C26-3 (DOUT) - Body ground and other terminals Power switch off 10 kohms or higher Connect the compressor with motor assembly connector. Connect the hybrid vehicle control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HYBRID VEHICLE CONTROL ECU Disconnect connector C26 from the compressor with motor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition C26-3 (DOUT) - Body ground Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Compressor with Motor Assembly) Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C26-1 (CLK) - Body ground Power switch on (IG) 11 to 14 V C26-2 (DIN) - Body ground Power switch on (IG) 11 to 14 V C26-3 (DOUT) - Body ground Power switch on (IG) Below 1 V NOTE: Turning the power switch on (IG) with the compressor with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Connect the compressor with motor assembly connector. NG --> See step 13 OK: Go to next step
8. CHECK COMPRESSOR WITH MOTOR ASSEMBLY Disconnect connector C28 from the hybrid vehicle control ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition C28-18 (CLK) - Body ground Power switch off 10 kohms or higher C28-20 (ITE) - Body ground Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C28-19 (ETI) - Body ground Power switch on (IG) 11 to 14V C28-18 (CLK) - Body ground Power switch on (IG) Below 1 V C28-20 (ITE) - Body ground Power switch on (IG) Below 1 V NOTE: Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Connect the hybrid vehicle control ECU connector. NG --> See step 12 OK --> See step 13
9. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY) Disconnect connector C28 from the hybrid vehicle control ECU. Disconnect connector C26 from the compressor with motor assembly. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C28-33 (STB) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) *2 Front view of wire harness connector (to Compressor with Motor Assembly) NOTE: Turning the power switch on (IG) with the hybrid vehicle control ECU connector and the compressor with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Switch Condition Specified Condition C28-33 (STB) - C26-4 (STBI) Power switch off Below 1 ohms Standard Resistance (Check for Short) Tester Connection Switch Condition Specified Condition C28-33 (STB) or C26-4 (STBI) - Body ground and other terminals Power switch off 10 kohms or higher Connect the compressor with motor assembly connector. Connect the hybrid vehicle control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
10. CHECK HYBRID VEHICLE CONTROL ECU Disconnect connector C26 from the compressor with motor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition C26-4 (STBI) - Body ground Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Compressor with Motor Assembly) Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C26-4 (STBI) - Body ground Power switch on (IG) Below 1 V NOTE: Turning the power switch on (IG) with the compressor with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection. Turn the power switch off. Connect the compressor with motor assembly connector. NG --> See step 13 OK: Go to next step
11. CHECK COMPRESSOR WITH MOTOR ASSEMBLY Disconnect connector C28 from the hybrid vehicle control ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition C28-33 (STB) - Body ground Power switch off 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition C28-33 (STB) - Body ground Power switch on (IG) 11 to 14 V Turn the power switch off. Connect the hybrid vehicle control ECU connector. NG --> See step 12 OK --> See step 13
12. REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to «COMPONENTS»(/lexus/hs/i-2009-2012/remont/automatic-hvac-system/#air-conditioning-service-information)
13. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to «COMPONENTS»(ref-398232-S05375191312011051600000)
14. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-398094-S11405263312011051600000)

The hybrid vehicle control ECU monitors the IGCT relay and detects malfunctions.

Scheme 29

The hybrid vehicle transaxle assembly consists of the power split planetary gear unit, MG1, MG2, and the 2-stage motor speed reduction planetary gear unit. The power split planetary gear unit uses a planetary gear to split engine output in accordance with driving requests while the vehicle is driven or the HV battery is charged. MG2 assists engine output while increasing vehicle drive force. MG2 also converts the energy, which would otherwise be consumed in the form of heat during normal braking, into electrical energy. This recovered energy is put back into the HV battery to perform regenerative braking. MG1 generates power, which is used for charging the HV battery or driving MG2, and also regulates the amount of electricity being generated. In addition, MG1 is used as a starter motor to start the engine.

Refer to the description for P3147-239. Refer to DESCRIPTION .

1. The MG ECU located in the inverter with converter assembly detects the temperature of the generator inverter using the temperature sensor built into the generator inverter. If necessary, the MG ECU will limit inverter output to help prevent generator inverter overheating. The hybrid vehicle control ECU also detects malfunctions in the sensor based on the temperature sensor values. The inverter with converter assembly detects malfunctions in the generator inverter temperature sensor and its wiring.

1. The MG ECU located in the inverter with converter assembly detects the temperature of the generator inverter using the temperature sensor built into the inverter with converter assembly. The inverter cooling system operates independently of the engine cooling system. The MG ECU uses signals from the generator inverter temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the MG ECU will limit inverter output to help prevent inverter overheating. The ECU also detects malfunctions in the generator inverter temperature sensor and its wiring.

1. The MG ECU located in the inverter with converter assembly detects the temperature of the boost converter using a temperature sensor built into the inverter with converter assembly. The inverter cooling system is the same as that for MG2 and MG1, and it operates independently of the engine cooling system. The MG ECU uses the signal from the boost converter temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the MG ECU will limit inverter output to prevent inverter overheating. The ECU also detects malfunctions in the boost converter temperature sensor.

The MG ECU uses a temperature sensor that is built into the boost converter to detect the boost converter temperature. The boost converter temperature sensor outputs a voltage that varies between 0 and 5 V in accordance with changes in the temperature. The higher the boost converter temperature, the lower the output voltage. Conversely, the lower the temperature, the higher the output voltage. The MG ECU limits the load based on signals transmitted by the boost converter temperature sensor, in order to prevent the converter from overheating. The MG ECU also detects malfunctions in the wiring of the boost converter temperature sensor, as well as in the sensor itself.

Scheme 30

The hybrid vehicle control ECU sends a shutdown signal to the inverter with converter assembly (MG ECU) to shut down the power supply to MG2.

Scheme 31

Refer to the description for DTC P3232-749. Refer to DESCRIPTION .

The Controller Area Network (CAN) is a serial data communication system for real-time application. It is a multiplex communication system designed for on-vehicle use that provides a superior communication speed of 500 kbps and a capability to detect malfunctions.

The hybrid vehicle control ECU sends and receives data to and from ECUs connected to the V1 bus and V2 bus. If a communication error occurs between the hybrid vehicle control ECU and one of these ECUs, the hybrid vehicle control ECU stores a DTC.

1. The hybrid vehicle control ECU transmits and receives signals to and from the ECM (included in hybrid vehicle control ECU), skid control ECU, main body ECU, and power management control ECU via CAN communication.

If the hybrid vehicle control ECU detects a problem with CAN communication with the ECM (included in hybrid vehicle control ECU), it will illuminate the MIL and set a DTC.

1. For a description of the inverter with converter assembly. Refer to «DESCRIPTION»(ref-398238-S05873472972011051600000) . The inverter with converter assembly (MG ECU) controls MG2 based on commands from the hybrid vehicle control ECU. The inverter with converter assembly (MG ECU) monitors communication data and detects malfunctions.

Scheme 32

Refer to the description for DTC U0110-159. Refer to DESCRIPTION .

Since the airbag sensor assembly is connected to the CAN, signals sent to the hybrid vehicle control ECU.

Since the air conditioning amplifier is connected to the CAN, signals sent to the hybrid vehicle control ECU.

If there is a malfunction in the air conditioning amplifier assembly, DTC U0424-537 will be output.

When the auxiliary battery is replaced or the cable is disconnected from its negative (-) battery terminal, the ISC learning value will be initialized and symptoms such as a noise from the hybrid vehicle transaxle assembly may occur until ISC learning is performed.

Therefore, perform ISC learning when the auxiliary battery is replaced or the cable is disconnected from the negative (-) terminal of the auxiliary battery.

The EV mode signal is sent to the hybrid vehicle control ECU. This signal is then transmitted from the hybrid vehicle control ECU via CAN to the combination meter assembly to illuminate the EV indicator lamp.

Scheme 33

When selecting power mode, the switch operation signal is sent to the hybrid vehicle control ECU. Following this, the drive torque is optimally controlled to obtain a sporty feel in response to the driver's acceleration operation.

Scheme 34

Scheme 35

Scheme 36

Scheme 37

1. READ VALUE USING TECHSTREAM (CAN BUS CHECK) See step 2 B --> See step 9 A: Go to next step
2. CHECK DTC OUTPUT (ALL) See step 3 B --> GO TO DTC CHART «DIAGNOSTIC TROUBLE CODE CHART»(ref-398094-S11405263312011051600000) A: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (COMBINATION METER) Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Body Electrical / Combination Meter / Active Test / Indicat. Lamp ECT PWR. Perform the "Indicat. Lamp ECT PWR" Active Test. OK The PWR mode indicator lamp blinks. Turn the power switch off. NG --> See step 10 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR Disconnect connector A58 from the hybrid vehicle control ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A58-29 (PWMS) - Body ground PWR mode switch operated Below 1 ohms A58-29 (PWMS) - Body ground PWR mode switch not operated 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) Connect the hybrid vehicle control ECU connector. B --> See step 5 OK --> See step 12
5. CHECK COMBINATION SWITCH ASSEMBLY (POWER SWITCH) Remove the combination switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F18-2 (PWR) - F18-3 (E) PWR mode switch operated Below 1 ohms F18-2 (PWR) - F18-3 (E) PWR mode switch not operated 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Combination Switch Assembly) Install the combination switch assembly. NG --> See step 11 OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND) See step 7 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - HYBRID VEHICLE CONTROL ECU) Disconnect connector A58 from the hybrid vehicle control ECU. Disconnect connector from the combination switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A58-29 (PWMS) - F18-2 (PWR) Always Below 1 ohms A58-29 (PWMS) or F18-2 (PWR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Hybrid Vehicle Control ECU) *2 Front view of wire harness connector (to Combination Switch Assembly) Connect the combination switch assembly connector. Connect the hybrid vehicle control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
8. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-398094-S05300073002011051600000)
9. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398235-S17886579092011051600000)
10. REPLACE COMBINATION METER ASSEMBLY. Refer to «COMPONENTS»(ref-398236-S29550529402011051600000)
11. REPLACE COMBINATION SWITCH ASSEMBLY. Refer to «COMPONENTS»(ref-398232-S39648859162011051600000)
12. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to «COMPONENTS»(ref-398232-S05375191312011051600000)

When selecting ECO mode, the switch operation signal is sent to the air conditioning amplifier assembly. Following this, ECO mode control is activated for the heater and air conditioning system.

Scheme 38

Scheme 39

Scheme 40

Scheme 41

1. READ VALUE USING TECHSTREAM (CAN BUS CHECK) See step 2 B --> See step 9 A: Go to next step
2. CHECK DTC OUTPUT (ALL) See step 3 B --> GO TO DTC CHART «DIAGNOSTIC TROUBLE CODE CHART»(ref-398094-S11405263312011051600000) A: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (COMBINATION METER) Connect the Techstream to the DLC3. Turn the power switch on (READY). Enter the following menus: Body Electrical / Combination Meter / Active Test / Indicat. ECONO. Perform the "Indicat. ECONO" Active Test. OK The ECO mode indicator lamp blinks. Turn the power switch off. NG --> See step 10 OK: Go to next step
4. READ VALUE USING TECHSTREAM (ECO SWITCH) Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Body Electrical / Air Conditioning / Data List / ECO Switch. Read the value displayed on the Techstream. Tester Display Measurement Item/Range Normal Condition ECO Switch ECO switch condition/ ON or OFF ON: ECO mode switch operated OFF: ECO mode switch not operated Result Result Proceed to The Techstream display changes according to the ECO mode switch operation. A The Techstream display does not change according to the ECO mode switch operation. B B --> See step 5 A --> See step 8
5. CHECK COMBINATION SWITCH ASSEMBLY (ECO SWITCH) Remove the combination switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F18-5 (ECO) - F18-4 (E) ECO mode switch operated Below 1 ohms F18-5 (ECO) - F18-4 (E) ECO mode switch not operated 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Combination Switch Assembly) Install the combination switch assembly. NG --> See step 11 OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND) Disconnect connector from the combination switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F18-4 (E) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Combination Switch Assembly) Connect the combination switch assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - AIR CONDITIONING AMPLIFIER) Disconnect connector F47 from the air conditioning amplifier assembly. Disconnect connector from the combination switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F47-9 (ECON) - F18-5 (ECO) Always Below 1 ohms F47-9 (ECON) or F18-5 (ECO) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Conditioning Amplifier Assembly) *2 Front view of wire harness connector (to Combination Switch Assembly) Connect the combination switch assembly connector. Connect the air conditioning amplifier assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 12
8. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-398094-S05300073002011051600000)
9. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398235-S17886579092011051600000)
10. REPLACE COMBINATION METER ASSEMBLY. Refer to «COMPONENTS»(ref-398236-S29550529402011051600000)
11. REPLACE COMBINATION SWITCH ASSEMBLY. Refer to «COMPONENTS»(ref-398232-S39648859162011051600000)
12. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «COMPONENTS»(/lexus/hs/i-2009-2012/remont/automatic-hvac-system/#air-conditioning-service-information)

See also:
• COMPONENTS
• COMPONENTS
• COMPONENTS