DTCs P0300-P0306 Detection Logic
On DTCs P0300-P0306, MIL is set in 2 stages. If ECM detects misfiring strong enough to cause catalytic converter overheating for any 200 revolutions of engine, MIL will blink, but will not stay illuminated. If ECM detects misfiring strong enough to cause deterioration of catalytic converter during 2 consecutive drive cycles, for any 1000 revolutions of engine, MIL will illuminate.
Note. When road testing vehicle in CHECK mode (Lexus scan tool only), Two Trip Detection Logic will not function. Also, MIL will illuminate first time a malfunction is detected.
DATA LINK CONNECTOR
OBD-II regulations (SAE J-1850) standardizes Data Link Connector (DLC) configurations. On all models, DLC No. 3 connector is located under left side of instrument panel. (Scheme 32)
FREEZE-FRAME DATA
The ECM records engine operating condition when a misfire, fuel trim (mixture) malfunction or other malfunction (fuel system, calculated load, coolant temperature, fuel trim (mixture), engine speed, vehicle speed, etc.) exists. If more than one fault is detected, only data from first malfunction is recorded. Recorded data is useful for determining conditions in which malfunction occurs.
NORMAL Mode Code Retrieval
- Connect scan tool to Data Link Connector (DLC) No. 3. (Scheme 32) DLC No. 3 is located under left side of instrument panel. Turn ignition on with engine off. Turn scan tool on. Using scan tool manufacturer's instructions, check for DTCs and freeze-frame data.
- If scan tool displays UNABLE TO CONNECT TO VEHICLE, DLC No. 3 must be checked. See «DLC NO. 3 INSPECTION»(ref-134937-S23182733902002022100000) under SCAN TOOL PROBLEMS. If scan tool does not display UNABLE TO CONNECT TO VEHICLE, go to next step.
- Record any DTCs and freeze-frame data displayed for system diagnosis. If driveability problem exists and no DTCs are present, go to «TROUBLE SHOOTING - NO CODES»(ref-134942) article for diagnosis by symptom.
- If any DTCs are present, perform appropriate diagnostic test in «DIAGNOSTIC TESTS»(ref-134937-S42715088952002022100000). See «DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION»(ref-134937-S15736860702002022100000) table. For more information on freeze-frame data, see «FREEZE-FRAME DATA»(ref-134937-S19223826512002022100000) under INTRODUCTION. For information on 2-trip detection logic codes, see «TWO-TRIP DETECTION LOGIC»(ref-134937-S26170631292002022100000) under INTRODUCTION.
- After repairs for DTC have been completed, DTCs must be cleared from ECM memory. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-134937-S11701235242002022100000).
Scheme 32
| DTC (1) | Description |
|---|---|
| P0100 | Mass Airflow (MAF) Sensor Circuit |
| P0101 | Mass Airflow (MAF) Sensor Circuit Range/Performance Fault |
| P0110 | Intake Air Temperature (IAT) Sensor Circuit |
| P0115 | Engine Coolant Temperature (ECT) Circuit |
| P0116 | Engine Coolant Temperature (ECT) Circuit Range/Performance Fault |
| P0120 | Throttle (TP)/Pedal Position Sensor Circuit Malfunction |
| P0121 | Throttle (TP)/Pedal Position Sensor Circuit Range/Performance Fault |
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control |
| P0128 | Thermostat Malfunction |
| P0130/P0150 | Heated Oxygen Sensor Circuit Malfunction |
| P0133/P0153 | Heated Oxygen Sensor Circuit Slow Response |
| P0135/P0155 | Heated Oxygen Sensor Heater Circuit |
| P0136/P0156 | Heated Oxygen Sensor Circuit Malfunction |
| P0141/P0161 | Heated Oxygen Sensor Heater Circuit |
| P0171/P0172 | System Too Lean/Rich (Bank No. 1) |
| P0174/P0175 | System Too Lean/Rich (Bank No. 2) |
| P0300 | Random Multiple Cylinder Misfire Detected |
| P0301-P0306 | Cylinders No. 1-6 Misfire Detected |
| P0325/P0330 | Knock Sensor Circuit Malfunction |
| P0335 | Crankshaft Position (CKP) Sensor "A" Circuit Malfunction |
| P0340 | Camshaft Position (CMP) Sensor Circuit Malfunction |
| P0420/P0430 | Catalyst System Efficiency Below Threshold |
| P0440 | EVAP System Malfunction |
| P0441 | Incorrect EVAP System Purge Flow |
| P0450 | EVAP System Pressure Sensor Malfunction |
| P0451 | EVAP System Pressure Sensor Range/Performance Fault |
| P0500 | Vehicle Speed Sensor (VSS) Malfunction |
| P0505 | Idle Control System Malfunction |
| P0550 | P/S Pressure Sensor Malfunction |
| P0710 (2) | Transmission Fluid Temperature Sensor Fault |
| P0711 (2) | Transmission Fluid Temperature Sensor Circuit Range/Performance Fault |
| P0715 (2) | Turbine Speed Sensor Fault |
| P0750 (2) | Shift Solenoid Valve No. 1 Fault |
| P0753 (2) | Shift Solenoid Valve No. 1 Electrical Fault |
| P0755 (2) | Shift Solenoid Valve No. 2 Fault |
| P0758 (2) | Shift Solenoid Valve No. 2 Electrical Fault |
| P0760 (2) | Shift Solenoid Valve No. 3 Fault |
| P0763 (2) | Shift Solenoid Valve No. 3 Electrical Fault |
| P0768 (2) | Shift Solenoid Valve No. 4 Electrical Fault |
| P0770 (2) | Lock-Up Solenoid Fault |
| P1120 | Accelerator Pedal Position Sensor Circuit Malfunction |
| P1121 | Accelerator Pedal Position Sensor Circuit Malfunction |
| P1125 | Throttle Control Motor Circuit Malfunction |
| P1126 | Magnetic Clutch Circuit Malfunction |
| P1127 | Electronic Throttle Control System (ETCS) Actuator Power Source Circuit Malfunction |
| P1128 | Throttle Control Motor Lock Malfunction |
| P1129 | Electronic Throttle Control System (ETCS) Malfunction |
| P1300 | Ignitor Circuit Malfunction |
| P1335 | Crankshaft Position (CKP) Sensor |
| P1346 | Variable Valve Timing (VVT) Circuit Range/Performance Fault |
| P1349 | Variable Valve Timing (VVT) System Malfunction |
| P1520 | Stoplight Switch Signal Malfunction |
| P1600 | ECM Batt Malfunction |
| P1633 | Electronic Throttle Control System (ETCS) Circuit ECM Malfunction |
| P1645 | Body ECU Malfunction |
| P1656 | Oil Control Valve (OCV) Circuit Malfunction |
| P1755 (2) | Shift Solenoid Valve SLU Fault |
| P1760 (2) | Shift Solenoid Valve SLT Fault |
| P1765 (2) | Shift Solenoid Valve SLN Fault |
| P1780 | Park/Neutral Position Switch Malfunction |
| B2795 (3) | Unmatched Key Code |
| B2796 (3) | No Communication In Immobilizer System |
| B2797 (3) | Communication Malfunction No. 1 |
| B2798 (3) | Communication Malfunction No. 2 |
| (1) Some codes are two-trip detection logic code(s). For more information, see DETECTION LOGIC under INTRODUCTION. (2) These codes only apply to electronically controlled transmissions. For testing procedures, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. (3) MIL will not illuminate. For testing procedures, see ENGINE IMMOBILIZER SYSTEMS - GS300 & GS430 article in ACCESSORIES & EQUIPMENT. | |
| (1) | Some codes are two-trip detection logic code(s). For more information, see DETECTION LOGIC under INTRODUCTION. |
| (2) | These codes only apply to electronically controlled transmissions. For testing procedures, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. |
| (3) | MIL will not illuminate. For testing procedures, see ENGINE IMMOBILIZER SYSTEMS - GS300 & GS430 article in ACCESSORIES & EQUIPMENT. |
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
SUMMARY
If no diagnostic trouble codes are present, driveability symptoms exist or intermittents exist, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent procedures.