Lexus IS250 IS220d GSE20 ALE20 - HEATER
COMBUSTION TYPE POWER HEATER SYSTEM - DIAGNOSTIC TROUBLE CODE CHART
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | See page |
| 010 | Over Voltage Shutoff | Battery voltage is 14 V or more for 20 seconds or more. | 1. Wire harness or connector between combustion heater assembly and battery 2. Battery 3. Alternator 4. Combustion heater assembly | |
| 011 | Under Voltage Shutoff | Battery voltage is 10 V or less for 20 seconds or more. | 1. Wire harness or connector between combustion heater assembly and battery 2. Battery 3. Alternator 4. Combustion heater assembly | |
| 012 | Overheating | The surface sensor or control overheating sensor detects a temperature of 125°C (257°F) or more. | 1. Surface sensor (combustion heater assembly) 2. Control overheating sensor (combustion heater assembly) 3. Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly) | |
| 014 | Difference Evaluation Overheating | When the engine coolant temperature is 80°C (176°F) and the combustion heater assembly is operating, the difference in temperatures detected by the surface sensor and control overheating sensor is 25°C (77°F) or more. | 1. Surface sensor (combustion heater assembly) 2. Control overheating sensor (combustion heater assembly) 3. Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly) | |
| 015 | Operating Block caused by Overheating | The control overheating sensor detects overheating of the engine coolant, and the power heater ECU stops the operation of the combustion heater assembly. (Either or both of DTCs 012 and 014 are detected 10 times in a row.) | 1. Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly) 2. Combustion heater assembly | |
| 016 | Difference Evaluation 2 | The difference in temperatures detected by the surface sensor and control overheating sensor is 30°C (86°F) or more. | 1. Surface sensor (combustion heater assembly) 2. Control overheating sensor (combustion heater assembly) | |
| 017 | Hardware Overheating | When neither DTC 012 nor 014 is detected, the control overheating sensor or surface sensor detects a temperature of 130°C (266°F). | 1. Control overheating sensor (combustion heater assembly) 2. Surface sensor (combustion heater assembly) 3. Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly) | |
| 020 | Glow Plug Malfunction | Operation stop of the glow plug is detected. (Open in the circuit) | 1. Glow plug (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 021 | Glow Plug Output Overload | Overload on the glow plug or a short in the wire harness that is connected to the glow plug is detected. | 1. Glow plug (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 022 | Glow Plug Output Error | An error is detected in output from the power heater ECU to the glow plug, or a problem with the wire harness that is connected to the glow plug is detected. | 1. Power heater ECU (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 025 | Short in K-line Circuit | A short circuit is detected in the diagnostic communication line in the combustion heater assembly. | Combustion heater assembly | |
| 030 | Abnormal Combustion Air Blower Motor Speed | Air blower motor speed is out of the allowable range (8,800 rpm to 10,400 rpm). (An object may be caught in or between parts around the air blower motor.) | Air blower motor (combustion heater assembly) | |
| 031 | Combustion Air Blower Motor Malfunction | Operation stop of the air blower motor is detected. (Open in the circuit) | 1. Air blower motor (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 032 | Short in Combustion Air Blower Motor Circuit | A short circuit is detected in the wire harness which is connected to the air blower motor. | Wire harness or connector (combustion heater assembly) | |
| 034 | Combustion Air Blower Motor Output Error | An error is detected in output from the power heater ECU to the air blower motor, or a problem with the wire harness that is connected to the air blower motor is detected. | 1. Power heater ECU (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 047 | Short in Heater Fuel Pump Circuit | A short is detected in the heater fuel pump circuit. | 1. Wire harness or connector between heater fuel pump and combustion heater assembly 2. Wire harness or connector between heater fuel pump and body ground 3. Heater fuel pump 4. Combustion heater assembly | |
| 048 | Heater Fuel Pump Malfunction | Operation stop of the heater fuel pump is detected. (Open in the circuit) | 1. Wire harness or connector between combustion heater assembly and heater fuel pump 2. Wire harness or connector between heater fuel pump and body ground 3. Heater fuel pump 4. Combustion heater assembly | |
| 049 | Heater Fuel Pump Output Error | An error is detected in output to the heater fuel pump. | 1. Wire harness or connector between combustion heater assembly and heater fuel pump 2. Wire harness or connector between heater fuel pump and body ground 3. Heater fuel pump 4. Power heater ECU (combustion heater assembly) | |
| 050 | Detection of No Ignition | The ECU is locked as a result of 10 successive heater ignition failures. | 1. Intake air duct 2. Exhaust air duct 3. Fuel pump filter 4. Heater fuel pump 5. Combustion heater assembly | |
| 051 | Cold Blow Time Exceeded | After the combustion heater is turned on, the temperature of the flame sensor is 90°C (194°F) or more for 600 seconds or more before the heater ignites. | Combustion heater assembly | |
| 052 | Safety Time Exceeded | A heater ignition failure is detected. | 1. Exhaust air duct 2. Intake air duct 3. Fuel pump filter 4. Heater fuel pump 5. Combustion heater assembly | |
| 054 | High Setting of Flame Cutout | Combustion ends abnormally (High output operation). | 1. Exhaust air duct 2. Intake air duct 3. Fuel pump filter 4. Heater fuel pump 5. Combustion heater assembly | |
| 056 | Low Setting of Flame Cutout | Combustion ends abnormally (Low output operation). | 1. Exhaust air duct 2. Intake air duct 3. Fuel pump filter 4. Heater fuel pump 5. Combustion heater assembly | |
| 060 | Overheating Control Sensor Malfunction | Operation stop of the control overheating sensor is detected. (Open in the circuit) | Control overheating sensor (combustion heater assembly) | |
| 061 | Short in Overheating Control Sensor Circuit | A short is detected in the control overheating sensor circuit. | 1. Control overheating sensor (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 064 | Flame Sensor Malfunction | Operation stop of the flame sensor is detected. (Open in the circuit) | Flame sensor (combustion heater assembly) | |
| 065 | Short in Flame Sensor Circuit | A short is detected in the flame sensor circuit. | 1. Flame sensor (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 071 | Surface Sensor Malfunction | Operation stop of the surface sensor is detected. (Open in the circuit) | Surface sensor (combustion heater assembly) | |
| 072 | Short in Surface Sensor Circuit | A short is detected in the surface sensor circuit. | 1. Surface sensor (combustion heater assembly) 2. Wire harness or connector (combustion heater assembly) | |
| 074 | ECU Overheating | The power heater ECU stops operating due to overheating. | Power heater ECU (combustion heater assembly) | |
| 090 | ECU Internal Malfunction / Reset Detection | An internal malfunction of the control unit is detected. | Power heater ECU (combustion heater assembly) | |
| 091 | Repeated Resets Detection | Reset operation is repeated too many times. | Power heater ECU (combustion heater assembly) | |
| 092 | ROM Error | A control unit (ROM) error is detected. | Power heater ECU (combustion heater assembly) | |
| 093 | RAM Error | A control unit (RAM) error is detected. | Power heater ECU (combustion heater assembly) | |
| 094 | Transistor Malfunction | A transistor malfunction due to frequent operation interruptions is detected. | Power heater ECU (combustion heater assembly) | |
| 095 | Software Stuck Overflow | A software stuck overflow is detected. | Power heater ECU (combustion heater assembly) | |
| 096 | Operation Locked Detection | An operation lock due to the absence of valid process is detected. | Power heater ECU (combustion heater assembly) | |
| 097 | ECU Defects | An internal control unit malfunction is detected. | Power heater ECU (combustion heater assembly) | |
| 098 | Main Relay Malfunction | A main relay malfunction is detected. | Power heater ECU (combustion heater assembly) | |
| 099 | EEPROM Error | An EEPROM error is detected. | Power heater ECU (combustion heater assembly) |
LEXUS IS250, IS220d / GSE20 ALE20