COMBUSTION TYPE POWER HEATER SYSTEM DIAGNOSTIC TROUBLE CODE CHART

Tech Tips

If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below.

Combustion Type Power Heater System
DTC Code 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.

- Harness or connector

- Heater assembly

Click here

011 Under Voltage Shutoff Battery voltage is 11 V or less for 20 seconds or more.

- Harness or connector

- Heater assembly

Click here

012 Overheating The surface sensor or temperature control sensor detects a temperature of 125°C (257°F) or more.

- Heater assembly (surface sensor)

- Heater assembly (temperature control sensor)

- Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

Click here

014 Difference Evaluation Overheating When the engine coolant temperature is 80°C (176°F) and the heater assembly is operating, the difference in temperatures detected by the surface sensor and temperature control sensor is 25°C (77°F) or more.

- Heater assembly (surface sensor)

- Heater assembly (temperature control sensor)

- Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

Click here

015 Operating Block caused by Overheating The temperature control sensor detects overheating of the engine coolant, and the ECU stops the operation of the heater assembly (either or both of DTCs 012 and 014 are detected 10 times in a row).

- Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

- Heater assembly

Click here

016 Difference Evaluation 2 The difference in temperatures detected by the surface sensor and temperature control sensor is 30°C (86°F) or more.

- Heater assembly (surface sensor)

- Heater assembly (temperature control sensor)

Click here

017 Hardware Overheating When neither DTC 012 nor 014 is detected, the temperature control sensor or surface sensor detects a temperature of 130°C (266°F).

- Heater assembly (surface sensor)

- Heater assembly (temperature control sensor)

- Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

Click here

020 Glow Plug Malfunction Operation stop of the glow plug is detected (open in the circuit).

- Heater assembly (glow plug)

- Harness or connector

Click here

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.

- Heater assembly (glow plug)

- Harness or connector

Click here

022 Glow Plug Output Error An error is detected in the output from the ECU to the glow plug, or a problem with the wire harness that is connected to the glow plug is detected.

- Heater assembly (ECU)

- Harness or connector

Click here

025 Short in K-line Circuit A short circuit is detected in the diagnostic communication line in the heater assembly.

- Heater assembly

- Harness or connector

Click here

030 Abnormal Combustion Air Blower Motor Speed Air blower motor speed is out of the allowable range (8800 rpm to 10400 rpm) (an object may be caught in or between parts around the air blower motor). Heater assembly (air blower motor)

Click here

031 Combustion Air Blower Motor Malfunction Operation stop of the air blower motor is detected (open in the circuit).

- Heater assembly (air blower motor)

- Harness or connector

Click here

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. Harness or connector

Click here

034 Combustion Air Blower Motor Output Error An error is detected in the output from the ECU to the air blower motor, or a problem with the wire harness that is connected to the air blower motor is detected.

- Heater assembly (ECU)

- Harness or connector

Click here

047 Short in Heater Fuel Pump Circuit A short is detected in the heater pump assembly circuit.

- Harness or connector

- Heater pump assembly

- Heater assembly

Click here

048 Heater Fuel Pump Malfunction Operation stop of the heater pump assembly is detected (open in the circuit).

- Harness or connector

- Heater pump assembly

- Heater assembly

Click here

049 Heater Fuel Pump Output Error An error is detected in the output to the heater pump assembly.

- Harness or connector

- Heater pump assembly

- Heater assembly (ECU)

Click here

050 Detection of No Ignition The ECU is locked as a result of 10 successive heater ignition failures.

- Fuel pump

- Air duct

- No. 1 exhaust pipe sub-assembly

- No. 2 exhaust pipe sub-assembly

- Heater pump assembly (fuel pump filter)

- Heater pump assembly

- Heater assembly (ECU)

Click here

051 Cold Blow Time Exceeded After the heater assembly 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.

- No. 1 exhaust pipe sub-assembly

- No. 2 exhaust pipe sub-assembly

- Heater assembly

Click here

052 Safety Time Exceeded A heater ignition failure is detected.

- Fuel pipe

- Air duct

- No. 1 exhaust pipe sub-assembly

- No. 2 exhaust pipe sub-assembly

- Heater pump assembly

- Heater assembly

- Heater pump assembly (fuel pump filter)

Click here

054 High Setting of Flame Cutout Combustion ends abnormally (high output operation).

- Fuel pipe

- Air duct

- No. 1 exhaust pipe sub-assembly

- No. 2 exhaust pipe sub-assembly

- Heater pump assembly

- Heater assembly

- Heater pump assembly (fuel pump filter)

Click here

056 Low Setting of Flame Cutout Combustion ends abnormally (low output operation).

- Fuel pipe

- Air duct

- No. 1 exhaust pipe sub-assembly

- No. 2 exhaust pipe sub-assembly

- Heater pump assembly

- Heater assembly

- Heater pump assembly (fuel pump filter)

Click here

060 Overheating Control Sensor Malfunction Operation stop of the temperature control sensor is detected (open in the circuit). - Heater assembly (temperature control sensor)

Click here

061 Short in Overheating Control Sensor Circuit A short is detected in the temperature control sensor circuit.

- Heater assembly (temperature control sensor)

- Harness or connector

Click here

064 Flame Sensor Malfunction Operation stop of the flame sensor is detected (open in the circuit). Heater assembly (flame sensor)

Click here

065 Short in Flame Sensor Circuit A short is detected in the flame sensor circuit.

- Heater assembly (flame sensor)

- Harness or connector

Click here

071 Surface Sensor Malfunction Operation stop of the surface sensor is detected (open in the circuit). Heater assembly (surface sensor)

Click here

072 Short in Surface Sensor Circuit A short is detected in the surface sensor circuit.

- Heater assembly (surface sensor)

- Harness or connector

Click here

074 ECU Overheating The ECU stops operating due to overheating. Heater assembly (ECU)

Click here

090 ECU Internal Malfunction / Reset Detection An internal malfunction of the control unit is detected. Heater assembly (ECU)

Click here

091 Repeated Resets Detection Reset operation is repeated too many times. Heater assembly (ECU)

Click here

092 ROM Error A control unit (ROM) error is detected. Heater assembly (ECU)

Click here

093 RAM Error A control unit (RAM) error is detected. Heater assembly (ECU)

Click here

094 Transistor Malfunction A transistor malfunction due to frequent operation interruptions is detected. Heater assembly (ECU)

Click here

095 Software Stuck Overflow A software stuck overflow is detected. Heater assembly (ECU)

Click here

096 Operation Locked Detection An operation lock due to the absence of a valid process is detected. Heater assembly (ECU)

Click here

097 ECU Defects An internal control unit malfunction is detected. Heater assembly (ECU)

Click here

098 Main Relay Malfunction A main relay malfunction is detected. Heater assembly (ECU)

Click here

099 EEPROM Error An EEPROM error is detected. Heater assembly (ECU)

Click here