Lexus IS250 IS220d GSE20 ALE20 - HEATER
REPLACE COMBUSTION HEATER ASSEMBLY
DTC 016 Difference Evaluation 2
DTC 020 Glow Plug Malfunction
DTC 021 Glow Plug Output Overload
DTC 022 Glow Plug Output Error
DTC 025 Short in K-line Circuit
DTC 030 Abnormal Combustion Air Blower Motor Speed
DTC 031 Combustion Air Blower Motor Malfunction
DTC 032 Short in Combustion Air Blower Motor Circuit
DTC 034 Combustion Air Blower Motor Output Error
DTC 060 Overheating Control Sensor Malfunction
DTC 061 Short in Overheating Control Sensor Circuit
DTC 064 Flame Sensor Malfunction
DTC 065 Short in Flame Sensor Circuit
DTC 071 Surface Sensor Malfunction
DTC 072 Short in Surface Sensor Circuit
DTC 074 ECU Overheating
DTC 090 ECU Internal Malfunction / Reset Detection
DTC 091 Repeated Resets Detection
DTC 092 ROM Error
DTC 093 RAM Error
DTC 094 Transistor Malfunction
DTC 095 Software Stuck Overflow
DTC 096 Operation Locked Detection
DTC 097 ECU Defects
DTC 098 Main Relay Malfunction
DTC 099 EEPROM Error
DESCRIPTION
| DTC No. | DTC Detection Condition | Trouble Area |
| 016 | The difference in temperatures detected by the surface sensor and control overheating sensor is 30°C (86°F) or more. | Surface sensor (combustion heater assembly) Control overheating sensor (combustion heater assembly) |
| 020 | Operation stop of the glow plug is detected. (Open in the circuit) |
Glow plug (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 021 | Overload on the glow plug or a short in the wire harness that is connected to the glow plug is detected. | Glow plug (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 022 | 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. | Power heater ECU (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 025 | A short circuit is detected in the diagnostic communication line in the combustion heater assembly. | Combustion heater assembly |
| 030 | 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 | Operation stop of the air blower motor is detected. (Open in the circuit) |
Air blower motor (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 032 | 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 | 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. | Power heater ECU (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 060 | Operation stop of the control overheating sensor is detected. (Open in the circuit) |
Control overheating sensor (combustion heater assembly) |
| 061 | A short is detected in the control overheating sensor circuit. | Control overheating sensor (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 064 | Operation stop of the flame sensor is detected. (Open in the circuit) |
Flame sensor (combustion heater assembly) |
| 065 | A short is detected in the flame sensor circuit. | Flame sensor (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 071 | Operation stop of the surface sensor is detected. (Open in the circuit) |
Surface sensor (combustion heater assembly) |
| 072 | A short is detected in the surface sensor circuit. | Surface sensor (combustion heater assembly) Wire harness or connector (combustion heater assembly) |
| 074 | The power heater ECU stops operating due to overheating. | Power heater ECU (Combustion heater assembly) |
| 090 | An internal malfunction of the control unit is detected. | Power heater ECU (combustion heater assembly) |
| 091 | Reset operation is repeated too many times. | Power heater ECU (combustion heater assembly) |
| 092 | A control unit (ROM) error is detected. | Power heater ECU (combustion heater assembly) |
| 093 | A control unit (RAM) error is detected. | Power heater ECU (combustion heater assembly) |
| 094 | A transistor malfunction due to frequent operation interruptions is detected. | Power heater ECU (combustion heater assembly) |
| 095 | A software stuck overflow is detected. | Power heater ECU (combustion heater assembly) |
| 096 | An operation lock due to the absence of valid process is detected. | Power heater ECU (combustion heater assembly) |
| 097 | An internal control unit malfunction is detected. | Power heater ECU (combustion heater assembly) |
| 098 | A main relay malfunction is detected. | Power heater ECU (combustion heater assembly) |
| 099 | An EEPROM error is detected. | Power heater ECU (combustion heater assembly) |
INSPECTION PROCEDURE
| 1.REPLACE COMBUSTION HEATER ASSEMBLY |
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