Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2003 Toyota Land CruiserFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC ⁽¹⁾

Description

Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1)

Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1)

Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)

Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 1)

Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 1)

Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2)

Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2)

Mass Airflow Meter Circuit

Mass Airflow Meter Circuit Range/Performance

Mass Airflow Meter Circuit Low Input

Mass Airflow Meter Circuit High Input

Intake Air Temperature Sensor Circuit

Intake Air Temperature Sensor Circuit Low Input

Intake Air Temperature Sensor Circuit High Input

Engine Coolant Temperature Sensor Circuit

Engine Coolant Temperature Sensor Circuit Range/Performance

Engine Coolant Temperature Sensor Circuit Low Input

Engine Coolant Temperature Sensor Circuit High Input

Throttle/Pedal Position Sensor/Switch "A" Circuit

Throttle Position Sensor Circuit Range/Performance

Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input

Throttle/Pedal Position Sensor/Switch "A" Circuit High Input

Insufficient Coolant Temperature For Closed Loop Fuel Control

Thermostat Malfunction

Heated Oxygen Sensor Circuit (Bank 1 Sensor 1)

Heated Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1)

Oxygen Sensor Circuit No Activity (Bank 1 Sensor 1)

Heated Oxygen Sensor Circuit (Bank 1 Sensor 2)

Heated Oxygen Sensor Circuit (Bank 2 Sensor 1)

Heated Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 1)

Oxygen Sensor Circuit No Activity (Bank 2 Sensor 1)

Heated Oxygen Sensor Circuit (Bank 2 Sensor 2)

System Too Lean (Bank 1)

System Too Rich (Bank 1)

System Too Lean (Bank 2)

System Too Rich (Bank 2)

Throttle/Pedal Position Sensor/Switch "B" Circuit

Throttle/Pedal Position Sensor/Switch "B" Circuit Low Input

Throttle/Pedal Position Sensor/Switch "B" Circuit High Input

P0230 ⁽⁵⁾

Fuel Pump Primary Circuit

P0300 ⁽⁴⁾

Random/Multiple Cylinder Misfire Detected

P0301 ⁽⁴⁾

Cylinder No. 1 Misfire Detected

P0302 ⁽⁴⁾

Cylinder No. 2 Misfire Detected

P0303 ⁽⁴⁾

Cylinder No. 3 Misfire Detected

P0304 ⁽⁴⁾

Cylinder No. 4 Misfire Detected

P0305 ⁽⁴⁾

Cylinder No. 5 Misfire Detected

P0306 ⁽⁴⁾

Cylinder No. 6 Misfire Detected

P0307 ⁽⁴⁾

Cylinder No. 7 Misfire Detected

P0308 ⁽⁴⁾

Cylinder No. 8 Misfire Detected

Knock Sensor No. 1 Circuit

Knock Sensor No. 2 Circuit

Crankshaft Position Sensor Circuit

P0339 ⁽⁵⁾

Crankshaft Position Sensor Circuit

Camshaft Position Sensor Circuit

Camshaft Position Sensor "A" Circuit Range/Performance (Bank 1 Or Single Circuit)

Ignition Coil "A" Primary/Secondary Circuit

Ignition Coil "B" Primary/Secondary Circuit

Ignition Coil "C" Primary/Secondary Circuit

Ignition Coil "D" Primary/Secondary Circuit

Ignition Coil "E" Primary/Secondary Circuit

Ignition Coil "F" Primary/Secondary Circuit

Ignition Coil "G" Primary/Secondary Circuit

Ignition Coil "H" Primary/Secondary Circuit

Catalyst System Efficiency Below Threshold (Bank 1)

Catalyst System Efficiency Below Threshold (Bank 2)

Incorrect EVAP Purge Flow

Evaporative Emission Control System Leak Detected (Small Leak)

EVAP Vent Control Malfunction

EVAP Pressure Sensor/Switch Range/Performance

EVAP Pressure Sensor/Switch Low Input

EVAP Pressure Sensor/Switch High Input

Evaporative Emission Control System Leak Detected (Very Small Leak)

Vehicle Speed Sensor "A" Circuit

Vehicle Speed Sensor "A" Circuit Intermittent/Erratic/High

Brake Switch "A"/"B"Correlation

Idle Air Control System Malfunction

System Voltage

P0571 ⁽⁶⁾

Brake Switch "A" Circuit

ECM Malfunction (Electronic Throttle Control System Circuit)

ECM/PCM Processor

Engine Control Module Performance

Starter Relay Circuit High

Actuator Supply Circuit Voltage Circuit Open

Throttle Actuator Control Motor Circuit Low

Throttle Actuator Control Motor Circuit High

Throttle Actuator Control System Stuck Open

Throttle Actuator Control System Stuck Closed

Throttle Actuator Control Motor Current Range/Performance

Throttle Actuator Control Throttle Body Range/Performance

Throttle/Pedal Position Sensor/Switch "D" Circuit

Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance

Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input

Throttle/Pedal Position Sensor/Switch "D" Circuit High Input

Throttle/Pedal Position Sensor/Switch "E" Circuit

Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input

Throttle/Pedal Position Sensor/Switch "E" Circuit High Input

Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation

Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation

Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1)

Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 1)

Oxygen Sensor Signal Stuck Lean (Bank 2 Sensor 1)

Oxygen Sensor Signal Stuck Rich (Bank 2 Sensor 1)

⁽¹⁾	Some DTCs are two-trip detection logic code(s). For more information, see TWO-TRIP DETECTION LOGIC under SELF-DIAGNOSTIC SYSTEM.

⁽²⁾	If this DTC is set, Engine Control Module (ECM) will enter fail-safe mode.

⁽³⁾	DTC applies to electronically controlled automatic transmission. For testing procedures, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

⁽⁴⁾	MIL lights up or blinks.

⁽⁵⁾	MIL will not illuminate.

⁽⁶⁾	DTC related to Cruise Control system, see appropriate CRUISE CONTROL article in ACCESSORIES & BODY, CAB.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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