Lexus ES: Diagnosis System
DIAGNOSIS SYSTEM
DESCRIPTION
(a) The hybrid vehicle control ECU has a self-diagnosis system. If the computer, hybrid control system, or a component is not working properly, the ECU records the conditions that relate to the fault. The ECU also illuminates the master warning light in the combination meter assembly and provides other appropriate messages on the multi-information display, such as the HV system warning message, HV battery warning message, or discharge warning message.
- When troubleshooting OBD II (On-Board Diagnostics) vehicles, the Techstream (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle ECM (Engine Control Module) can then be read.
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OBD II regulations require that the vehicle's on-board computer illuminates the MIL (Malfunction Indicator Lamp) on the instrument panel when the computer detects a malfunction in:
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- The emission control system components.
- The powertrain control components (which affect vehicle emissions).
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The computer itself.
In addition, the applicable DTCs prescribed by SAE J2012 are recorded in the hybrid vehicle control ECU memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the hybrid vehicle control ECU memory.
- To check for DTCs, connect the Techstream to the DLC3. The Techstream displays DTCs, freeze frame data, and a variety of hybrid control system data. The DTCs and freeze frame data can be cleared with the Techstream. In order to enhance the OBD function on vehicles and develop the off-board diagnosis system, Controller Area Network (CAN) communication is used in this system. CAN is a network which uses a pair of data transmission lines spanning multiple computers and sensors. It allows for high speed communications between the systems and simplification of the wire harness connections.
2 TRIP DETECTION LOGIC
- When a malfunction is first detected, the malfunction is temporarily stored in the hybrid vehicle control ECU memory (1st trip). If the same malfunction is detected during the next drive cycle, the MIL is illuminated (2nd trip).
FREEZE FRAME DATA
- The hybrid vehicle control ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.
AUXILIARY BATTERY VOLTAGE
Standard Voltage:
| Switch Condition | Specified Condition |
|---|---|
| Power switch on (IG) | 11 to 14 V |
-
If voltage is below 11 V, recharge or replace the auxiliary battery.
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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MIL (Malfunction Indicator Lamp)
(a) The MIL is illuminated when the power switch is first turned on (IG), before the READY light comes on.
(b) When the READY indicator turns on, the MIL should turn off. If the MIL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system.
HINT:
If the MIL is not illuminated when the power switch is first turned on (IG), check the MIL circuit.
for SFI System: Click here
RELEVANT SYSTEMS CHECK
The inspection areas and outline of the inspection for each circuit are listed below.
Inspection Details of Relevant Systems | System to be Inspected | Malfunction Possibility | Inspection Content |
|---|---|---|
| Motor Resolver Circuit | Motor resolver signal |
|
| Motor High-voltage Circuit | Motor (MG2) output |
|
| Generator Resolver Circuit | Generator resolver signal |
|
| Generator High-voltage Circuit | Generator (MG1) output |
|
| Inverter Low-voltage Circuit | Power supply voltage from +B or communication between hybrid vehicle control ECU and motor generator control ECU |
|
| HV Battery High-voltage Line Circuit | High voltage power supply from HV battery |
|
| Cooling System | Temperature abnormally high |
|
| Shutdown Signal Circuit | Shutdown signal |
|
DTC PRIORITY LEVEL AND TROUBLE AREAS
- Each DTC diagnostic procedure for the hybrid control system consists of a combination of the various relevant system (circuit) inspections.
- When multiple DTCs are output, performing each diagnostic procedure in order of priority can lead to a more accurate diagnosis.
Inspection Details of Relevant Systems | DTC No. | Detection Item | Order of Priority | Inspection Pattern | ||||
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |||
| Microcomputer Malfunction | Power Source Circuit Malfunction | Communication System Malfunction | Sensor and Actuator Circuit Malfunction | System Malfunction | |||
| P056014 | System Voltage (BATT) Circuit Short to Ground or Open | - | ○ | - | - | - | - |
| P060647 | Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure | ○ | - | - | - | - | - |
| P060687 | Hybrid/EV Powertrain Control Module Processor to Monitoring Processor Missing Message | ○ | - | - | - | - | - |
| P060694 | Hybrid/EV Powertrain Control Module Processor Unexpected Operation | ○ | - | - | - | - | - |
| P060A29 | Hybrid/EV Powertrain Control Module Monitoring Processor Signal Invalid | ○ | - | - | - | - | - |
| P060A44 | Hybrid/EV Powertrain Control Module Monitoring Processor Data Memory Failure | ○ | - | - | - | - | - |
| P060A45 | Hybrid/EV Powertrain Control Module Monitoring Processor Program Memory Failure | ○ | - | - | - | - | - |
| P060A47 | Hybrid/EV Powertrain Control Module Monitoring Processor Watchdog / Safety MCU Failure | ○ | - | - | - | - | - |
| P060A49 | Hybrid/EV Powertrain Control Module Monitoring Processor Internal Electronic Failure | ○ | - | - | - | - | - |
| P060A87 | Hybrid/EV Powertrain Control Module Processor from Monitoring Processor Missing Message | ○ | - | - | - | - | - |
| P060A94 | Internal Control Module Monitoring Processor Performance Unexpected Operation | ○ | - | - | - | - | - |
| P060B1C | Hybrid/EV Powertrain Control Module A/D Processing Voltage Out of Range | ○ | - | - | - | - | - |
| P060B49 | Hybrid/EV Powertrain Control Module A/D Processing Internal Electronic Failure | ○ | - | - | - | - | - |
| P060B71 | Hybrid/EV Powertrain Control Module A/D Processing Actuator Stuck | ○ | - | - | - | - | - |
| P062F44 | Hybrid/EV Powertrain Control Module EEPROM Data Memory Failure | ○ | - | - | - | - | - |
| P06881F | ECM/PCM Power Relay Sense Circuit Intermittent | - | ○ | - | - | - | - |
| P070562 | Transmission Range Sensor "A" Circuit (PRNDL Input) Signal Compare Failure | - | - | - | ○ | - | - |
| P0A0A13 | High Voltage System Interlock Circuit Open | - | - | - | - | ○ | - |
| P0A0A92 | High Voltage System Interlock Performance or Incorrect Operation | - | - | - | - | ○ | - |
| P0A1B49 | Drive Motor "A" Control Module Internal Electronic Failure | ○ | - | - | - | - | - |
| P0A1B94 | Drive Motor "A" Control Module Unexpected Operation | ○ | - | - | - | - | - |
| P0A1F94 | Hybrid/EV Battery Energy Control Module Unexpected Operation | ○ | - | - | - | - | - |
| P0A2A11 | Drive Motor "A" Temperature Sensor Circuit Short to Ground | - | - | - | ○ | - | - |
| P0A2A15 | Drive Motor "A" Temperature Sensor Circuit Short to Auxiliary Battery or Open | - | - | - | ○ | - | - |
| P0A2A1C | Drive Motor "A" Temperature Sensor Voltage Out of Range | - | - | - | ○ | - | - |
| P0A2A1F | Drive Motor "A" Temperature Sensor Circuit Intermittent | - | - | - | ○ | - | - |
| P0A3611 | Generator Temperature Sensor Circuit Short to Ground | - | - | - | ○ | - | - |
| P0A3615 | Generator Temperature Sensor Circuit Short to Auxiliary Battery or Open | - | - | - | ○ | - | - |
| P0A361C | Generator Temperature Sensor Voltage Out of Range | - | - | - | ○ | - | - |
| P0A361F | Generator Temperature Sensor Circuit Intermittent | - | - | - | ○ | - | - |
| P0A9300 | Inverter "A" Cooling System Performance | - | - | - | - | ○ | B |
| P0AA000 | Hybrid/EV Battery Positive Contactor Circuit Stuck Closed | - | - | - | - | ○ | - |
| P0AA073 | Hybrid/EV Battery Positive and Negative Contactor Actuator Stuck Closed | - | - | - | - | ○ | - |
| P0AA373 | Hybrid/EV Battery Negative Contactor Actuator Stuck Closed | - | - | - | - | ○ | - |
| P0AA649 | Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure | - | - | - | - | ○ | - |
| P0AA749 | Hybrid/EV Battery Voltage Isolation Sensor Circuit Internal Electronic Failure | - | - | - | ○ | - | - |
| P0ABF00 | Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance | - | - | - | ○ | - | - |
| P0AD911 | Hybrid/EV Battery Positive Contactor Circuit Short to Ground | - | - | - | ○ | - | - |
| P0AD915 | Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open | - | - | - | ○ | - | - |
| P0ADD11 | Hybrid/EV Battery Negative Contactor Circuit Short to Ground | - | - | - | ○ | - | - |
| P0ADD15 | Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open | - | - | - | ○ | - | - |
| P0AE173 | Hybrid/EV Battery Precharge Contactor Actuator Stuck Closed | - | - | - | - | ○ | - |
| P0AE411 | Hybrid/EV Battery Precharge Contactor Circuit Short to Ground | - | - | - | ○ | - | - |
| P0AE415 | Hybrid/EV Battery Precharge Contactor Circuit Short to Auxiliary Battery or Open | - | - | - | ○ | - | - |
| P0B231C | Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range | - | - | - | ○ | - | - |
| P0C7396 | Motor Electronics Coolant Pump "A" Component Internal Failure | - | - | - | ○ | - | - |
| P0C7600 | Hybrid/EV Battery System Discharge Time Too Long | - | - | - | - | ○ | - |
| P0D2D1C | Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range | - | - | - | - | ○ | - |
| P0E311C | Boosting Converter Voltage Sensor "A" Voltage Out of Range | - | - | - | - | ○ | - |
| P160600 | Collision detected or Collision Sensor Connection (Open) | - | - | - | - | - | - |
| P160604 | Collision detected or Collision Sensor Connection (Open) System Internal Failure | - | - | - | - | - | - |
| P1AC413 | Hybrid/EV Battery Stack 1 Current Interrupt Device Circuit Open | - | - | - | ○ | - | - |
| P1C2D62 | Hybrid/EV Battery "A" Voltage Sensor/Boosting Converter Voltage Sensor "A" Signal Compare Failure | - | - | - | - | ○ | - |
| P1C6A9F | Motor Shutdown Stuck Off | - | - | - | - | ○ | - |
| P1C6C9F | Generator Shutdown Stuck Off | - | - | - | - | ○ | - |
| P1C7779 | Engine Failed to Start Mechanical Linkage Failure | - | - | - | ○ | - | - |
| P1C7C49 | Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure | - | - | - | - | ○ | - |
| P1C7D49 | Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure | - | - | - | - | ○ | - |
| P1C7E49 | Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure | - | - | - | - | ○ | - |
| P1C7F49 | Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure | - | - | - | - | ○ | - |
| P1C8149 | High Voltage Power Resource Circuit Consumption Circuit Short | - | - | - | - | ○ | - |
| P1C8249 | High Voltage Power Resource Circuit Over Loading | - | - | - | - | ○ | - |
| P1C8349 | High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction | - | - | - | - | ○ | - |
| P1C8449 | High Voltage Power Resource Circuit Short during Ready ON | - | - | - | - | ○ | - |
| P1C8679 | Transmission (Input) Mechanical Linkage Failure | - | - | - | - | ○ | - |
| P1C8779 | Generator Mechanical Linkage Failure | - | - | - | - | ○ | - |
| P1C8879 | Planetary Gear Mechanical Linkage Failure | - | - | - | - | ○ | - |
| P1C9E9F | Hybrid/EV System Reset Stuck Off | - | - | - | - | ○ | - |
| P1CE213 | PCU Interlock Circuit Open | - | - | - | - | ○ | - |
| P1CE292 | PCU Interlock Performance or Incorrect Operation | - | - | - | - | ○ | - |
| P1CE31C | Hybrid/EV Powertrain Control Module Monitoring Processor A/D Processing Voltage Out of Range | ○ | - | - | - | - | - |
| P1CE349 | Hybrid/EV Powertrain Control Module Monitoring Processor A/D Processing Internal Electronic Failure | ○ | - | - | - | - | - |
| P1CE371 | Hybrid/EV Powertrain Control Module Monitoring Processor A/D Processing Actuator Stuck | ○ | - | - | - | - | - |
| P1CFA12 | IGB Signal Circuit Short to Auxiliary Battery | ○ | - | - | - | - | - |
| P212012 | Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Auxiliary Battery | - | - | - | ○ | - | - |
| P212014 | Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Ground or Open | - | - | - | ○ | - | - |
| P21201C | Throttle/Pedal Position Sensor/Switch "D" Voltage Out of Range | - | - | - | ○ | - | - |
| P21201F | Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent | - | - | - | ○ | - | - |
| P212512 | Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Auxiliary Battery | - | - | - | ○ | - | - |
| P212514 | Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open | - | - | - | ○ | - | - |
| P21251C | Throttle/Pedal Position Sensor/Switch "E" Voltage Out of Range | - | - | - | ○ | - | - |
| P21251F | Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent | - | - | - | ○ | - | - |
| P213800 | Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation | - | - | - | ○ | - | - |
| P21382B | Throttle/Pedal Position Sensor/Switch "D"/"E" Signal Cross Coupled | - | - | - | ○ | - | - |
| P253012 | IG2 Signal Circuit Short to Auxiliary Battery | ○ | - | - | - | - | - |
| P274A11 | Transmission Fluid Temperature Sensor "C" Circuit Short to Ground | - | - | - | ○ | - | - |
| P274A15 | Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open | - | - | - | ○ | - | - |
| P274A1C | Transmission Fluid Temperature Sensor "C" Voltage Out of Range | - | - | - | ○ | - | - |
| P274A1F | Transmission Fluid Temperature Sensor "C" Circuit Intermittent | - | - | - | ○ | - | - |
| P300449 | High Voltage Power Resource Circuit Short during Pre-Charge | - | - | - | - | ○ | - |
| P310711 | Lost Communication with Airbag System Control Module Circuit Short to Ground | - | - | ○ | - | - | - |
| P310715 | Lost Communication with Airbag System Control Module Circuit Short to Auxiliary Battery or Open | - | - | ○ | - | - | - |
| P310764 | Lost Communication with Airbag System Control Module Signal Plausibility Failure | - | - | ○ | - | - | - |
| P312387 | Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message | - | - | ○ | - | - | - |
| P314779 | Transmission (Shaft) Mechanical Linkage Failure | - | - | - | - | ○ | - |
| P314A31 | Motor Electronics Coolant Pump "A" No Signal | - | - | - | ○ | - | - |
| P31B300 | Hybrid/EV Battery Voltage High | - | - | - | ○ | - | - |
| P321E9F | Motor/Generator Shutdown Signal Stuck Off | - | - | - | - | ○ | - |
| P33B99F | Motor/Generator Shutdown Signal (Hybrid/EV Side) Stuck Off | - | - | - | - | ○ | - |
| P33BF9F | Motor/Generator Shutdown Signal (MG Side) Stuck Off | - | - | - | - | ○ | - |
| U010087 | Lost Communication with ECM/PCM "A" Missing Message | - | - | ○ | - | - | - |
| U010487 | Lost Communication with Cruise Control Module Missing Message | - | - | ○ | - | - | - |
| U011087 | Lost Communication with Drive Motor Control Module "A" Missing Message | - | - | ○ | - | - | - |
| U011187 | Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message | - | - | ○ | - | - | - |
| U012287 | Lost Communication with Vehicle Dynamics Control Module Missing Message | - | - | ○ | - | - | - |
| U012987 | Lost Communication with Brake System Control Module Missing Message | - | - | ○ | - | - | - |
| U014087 | Lost Communication with Body Control Module Missing Message | - | - | ○ | - | - | - |
| U015187 | Lost Communication with Restraints Control Module Missing Message | - | - | ○ | - | - | - |
| U016487 | Lost Communication with HVAC Control Module Missing Message | - | - | ○ | - | - | - |
| U029387 | Lost Communication with Hybrid/EV Powertrain Control Module Missing Message | - | - | ○ | - | - | - |
| U042481 | HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received | - | - | ○ | - | - | - |
| U110787 | Lost Communication with Power Management Module Missing Message | - | - | ○ | - | - | - |
| U117087 | Lost Communication with Brake System Control Module (Secondary CAN Line) Missing Message | - | - | ○ | - | - | - |
| U117587 | Lost Communication with Hybrid/EV Battery Energy Control Module "A" (Powertrain Bus) Missing Message | - | - | ○ | - | - | - |
HINT:
The "Example of Multiple DTCs being Output" below is only one example of a malfunction condition. Therefore, a determination should not be made based on this alone.
-
The power supply of the microcomputer decreases while the vehicle is being driven.
- DTCs are detected and the vehicle behavior is as follows.
Detected DTCs- P060B1C (Hybrid/EV Powertrain Control Module A/D Processing Voltage Out of Range): Microcomputer malfunction*
- P06881F (ECM/PCM Power Relay Sense Circuit Intermittent): Power source circuit malfunction*
- P0AA749 (Hybrid/EV Battery Voltage Isolation Sensor Circuit Internal Electronic Failure): Sensor and actuator circuit malfunction*
- P0B231C (Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range): Sensor and actuator circuit malfunction*
-
P1C9E9F (Hybrid/EV System Reset Stuck Off): System malfunction*
- *: Check the priority level in the "DTC Order of Priority" chart above.
Vehicle Behavior- System stopped
- The inspection order of priority is: Microcomputer circuit → power source circuit → communication circuit → sensor and actuator circuit → system circuit. Therefore, check the repair procedure for P060B1C.
- Follow the repair procedures and replace the hybrid vehicle control ECU. Finish the repair.
It is possible to check only the specified malfunctioning parts without having to check irrelevant parts.
READ NEXT:
Dtc Check / Clear
DTC CHECK / CLEAR CHECK FOR DTCS (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Hybrid Control / Tro
Freeze Frame Data
FREEZE FRAME DATA FREEZE FRAME DATA HINT: The hybrid vehicle control ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. It can be used for estimatin
Vehicle Behavior Chart
VEHICLE BEHAVIOR CHART VEHICLE BEHAVIOR CHART (a) Vehicle behavior categorized by DTC If a DTC is output, the vehicle behaves as follows. DTC No. Detection Item Vehicle Behavior when DTC is Out
SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during telephone and GPS antenna assembly removal/installation are shown below. Necessary Procedure After Part
Installation
INSTALLATION PROCEDURE 1. INSTALL NO. 1 SWITCH WIRE HINT: Perform this procedure only when replacement of the No. 1 switch wire is necessary. (a) Engage the 4 guides to install the No. 1 switch wire to the steering wheel assembly. NOTICE: Make sure that the junction of the No. 1 switch wire is th
