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.

2000 Toyota MR2FACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC ⁽¹⁾

Description

B2795 ⁽²⁾⁽³⁾

Unmatched Key Code

B2796 ⁽²⁾⁽³⁾

No Communication In Immobilizer System

B2797 ⁽²⁾⁽³⁾

Communication Malfunction No. 1

B2798 ⁽²⁾⁽³⁾

Communication Malfunction No. 2

P0100 ⁽⁴⁾

Mass Airflow Meter Circuit

Mass Airflow Meter Circuit Range/Performance

P0110 ⁽⁴⁾

Intake Air Temperature Sensor Circuit

P0115 ⁽⁴⁾

Engine Coolant Temperature Sensor Circuit

Engine Coolant Temperature Sensor Circuit Range/Performance

P0120 ⁽⁴⁾

Throttle Position Sensor Circuit

Throttle Position Sensor Circuit Range/Performance

Insufficient Coolant Temperature For Closed Loop Fuel Control

Heated Oxygen Sensor Circuit (Bank No. 1 Sensor No. 1)

Heated Oxygen Sensor Circuit Slow Response (Bank No. 1 Sensor No. 1)

Heated Oxygen Sensor Heater Circuit (Bank No. 1 Sensor No. 1)

Heated Oxygen Sensor Circuit (Bank No. 1 Sensor No. 2)

Heated Oxygen Sensor Heater Circuit (Bank No. 1 Sensor No. 2)

Heated Oxygen Sensor Circuit (Bank No. 2 Sensor No. 1)

Heated Oxygen Sensor Circuit Slow Response (Bank No. 2 Sensor No. 1)

Heated Oxygen Sensor Heater Circuit (Bank No. 2 Sensor No. 1)

System Too Lean (Bank No. 1)

System Too Rich (Bank No. 1)

System Too Lean (Bank No. 2)

System Too Rich (Bank No. 2)

Random Misfire Detected

Cylinder No. 1 Misfire Detected

Cylinder No. 2 Misfire Detected

Cylinder No. 3 Misfire Detected

Cylinder No. 4 Misfire Detected

P0325 ⁽⁴⁾

Knock Sensor Circuit

Crankshaft Position Sensor Circuit

Camshaft Position Sensor Circuit

Catalyst System Efficiency Below Threshold

Evaporative Emission Control System

Incorrect EVAP Purge Flow

EVAP Vent Control Circuit

EVAP Pressure Sensor Circuit

EVAP Pressure Sensor Range/Performance

Vehicle Speed Sensor Circuit

P0505 ⁽⁵⁾⁽⁶⁾

Idle Air Control System Circuit

P1120 ⁽⁶⁾⁽⁷⁾

Accelerator Pedal Position Sensor Circuit

P1121 ⁽⁶⁾⁽⁷⁾

Accelerator Pedal Position Sensor Range/Performance

P1125 ⁽⁶⁾⁽⁷⁾

Throttle Control Motor Circuit

P1126 ⁽⁶⁾⁽⁷⁾

Magnetic Clutch Circuit

P1127 ⁽⁶⁾⁽⁷⁾

Electronic Throttle Control System Actuator Power Source Circuit

P1128 ⁽⁶⁾⁽⁷⁾

Throttle Control Motor Lock Circuit

P1129 ⁽⁶⁾⁽⁷⁾

Electronic Throttle Control System Circuit

P1300 ⁽⁴⁾

Ignitor No. 1 Circuit

P1305 ⁽⁴⁾

Ignitor No. 2 Circuit

P1310 ⁽⁴⁾

Ignitor No. 3 Circuit

P1315 ⁽⁴⁾

Ignitor No. 4 Circuit

Crankshaft Position Sensor Circuit

Variable Valve Timing Circuit Range/Performance

Variable Valve Timing System Malfunction

Stoplight Switch Signal Circuit ⁽⁶⁾⁽⁷⁾

ECM Malfunction (Cruise Control System)

ECM BATT Circuit

P1633 ⁽⁶⁾⁽⁷⁾

ECM Malfunction (Electronic Throttle Control System Circuit)

Multiplex Communication Malfunction

P1646 ⁽⁶⁾⁽⁷⁾

Transmission Control ECU Malfunction

P1647 ⁽⁶⁾⁽⁷⁾

CAN Communication Malfunction

Oil Control Valve Malfunction

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

⁽²⁾	DTC applies to models equipped with engine immobilizer system. MIL will not illuminate if DTC exists. For testing procedures, see appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

⁽³⁾	MIL will not illuminate.

⁽⁴⁾	If this DTC is set, Engine Control Module (ECM) will enter fail-safe mode.

⁽⁵⁾	On 2000 models, DTC applies to all models. On 2001 models, DTC applies only to models with standard type manual transaxle.

⁽⁶⁾

On 2001 models, there are 2 types of manual transaxles used. A standard type manual transaxle and a sequential manual transaxle. Standard type manual transaxle is a common transaxle in which the driver operates the clutch and shifts the transaxle. Sequential manual transaxle is an electronically controlled manual transaxle in which the clutch is operated and transaxle is shifted hydraulically by moving the shift lever forward or backward. Sequential manual transaxle may be identified by shift lever pattern which consists of "R", "N", "S" and "+" in place of the conventional type shift lever pattern and no clutch pedal is used.

⁽⁷⁾	Applies only to 2001 models with sequential manual transaxle.

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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