COMBUSTION TYPE POWER HEATER SYSTEM > DIAGNOSTIC TROUBLE CODE CHART

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HINT:
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 higher 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 higher.
- Heater assembly (Surface sensor)
- Heater assembly (Temperature control sensor)
- Engine coolant circuit
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 higher.
- Heater assembly (Surface sensor)
- Heater assembly (Temperature control sensor)
- Engine coolant circuit
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 (one or both of DTCs
012 and 014 are detected 10 times in a row).
- Engine coolant circuit
- 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 higher.
- 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) or higher.
- Heater assembly (Surface sensor)
- Heater assembly (Temperature control sensor)
- Engine coolant circuit
Click here
020
Glow Plug Malfunction
Operation stop of the glow plug is detected (open in the circuit).
- Heater assembly (Glow plug)
- Heater assembly (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)
- Heater assembly (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)
- Heater assembly (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
- 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)
- Heater assembly (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.
- Heater assembly (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)
- Heater assembly (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 pipe
- Air duct
- No. 1 exhaust pipe sub-assembly
- No. 2 exhaust pipe sub-assembly
- Fuel filter assembly
- 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 higher for 600 seconds or more before heater ignition begins.
- 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
- Fuel filter assembly
- Heater pump assembly
- Heater assembly (ECU)
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
- Fuel filter assembly
- Heater pump assembly
- Heater assembly (ECU)
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
- Fuel filter assembly
- Heater pump assembly
- Heater assembly (ECU)
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)
- Heater assembly (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)
- Heater assembly (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)
- Heater assembly (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