2008 Toyota Corolla LE, AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Chart

HINT:

The parameters listed in the chart are for reference only.

Factors such as instrument type may cause readings to differ slightly from stated values.

If any DTCs are displayed during a check mode DTC check, check the circuit for the DTCs listed in the table below.

SFI SYSTEM: 

DIAGNOSTIC TROUBLE CODE CHART - SFI SYSTEM

Detection Item Trouble Areas MIL Memory See
Camshaft Position "A" Actuator Circuit (Bank 1)
  1. Open or short in Oil Control Valve (OCV) circuit
  2. OCV
  3. ECM
 Comes on DTC stored DTC P0010 CAMSHAFT POSITION "A" Actuator Circuit (Bank 1) 
Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)
  1. Valve timing
  2. OCV
  3. OCV filter
  4. Camshaft timing gear assembly
  5. ECM
 Comes on DTC stored DTC P0011 CAMSHAFT POSITION "A" - TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1);DTC P0012 CAMSHAFT POSITION "A" - Timing Over-Retarded (Bank 1) 
Camshaft Position "A" - Timing Over-Retarded (Bank 1) Same as DTC P0011 Comes on DTC stored DTC P0012 CAMSHAFT POSITION "A" - Timing Over-Retarded (Bank 1) 
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
  1. Mechanical system (Timing chain has jumped tooth or chain stretched)
  2. OCV
  3. OCV filter
  4. Camshaft timing gear assembly
  5. ECM
 Comes on DTC stored DTC P0016 Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A) 
Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
  1. Open in Air-Fuel Ratio (A/F) sensor heater circuit
  2. A/F sensor heater
  3. EFI relay
  4. ECM
 Comes on DTC stored  
Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1)
  1. Short in A/F sensor heater circuit
  2. A/F sensor heater
  3. EFI relay
  4. ECM
 Comes on DTC stored DTC P0032 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1) 
Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)
  1. Open in Heated Oxygen (HO2) sensor circuit
  2. HO2 sensor heater
  3. EFI relay
  4. ECM
 Comes on DTC stored DTC P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2) 
Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)
  1. Short in HO2 sensor heater circuit
  2. HO2 sensor heater
  3. EFI relay
  4. ECM
 Comes on DTC stored DTC P0038 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2) 
Mass or Volume Air Flow Circuit
  1. Open or short in Mass Air Flow (MAF) meter circuit
  2. MAF meter
  3. ECM
 Comes on DTC stored DTC P0100 Mass or Volume Air Flow Circuit 
Mass or Volume Air Flow Circuit Range / Performance Problem MAF meter Comes on DTC stored DTC P0101 Mass or Volume Air Flow Circuit Range / Performance Problem 
Mass or Volume Air Flow Circuit Low Input
  1. Open in MAF meter circuit
  2. MAF meter
  3. ECM
 Comes on DTC stored DTC P0102 Mass or Volume Air Flow Circuit Low Input 
Mass or Volume Air Flow Circuit High Input
  1. Short in MAF meter circuit
  2. MAF meter
  3. ECM
 Comes on DTC stored DTC P0103 Mass or Volume Air Flow Circuit High Input 
Intake Air Temperature Circuit
  1. Open or short in Intake Air Temperature (IAT) sensor circuit
  2. IAT sensor (built into Mass Air Flow [MAF] meter)
  3. ECM
 Comes on DTC stored DTC P0110 Intake Air Temperature Circuit 
Intake Air Temperature Sensor Gradient Too High Mass air flow (MAF) meter Comes on DTC stored DTC P0111 Intake Air Temperature Sensor Gradient Too High 
Intake Air Temperature Circuit Low Input
  1. Short in IAT sensor circuit
  2. IAT sensor (built into MAF meter)
  3. ECM
 Comes on DTC stored DTC P0112 Intake Air Temperature Circuit Low Input 
Intake Air Temperature Circuit High Input
  1. Open in IAT sensor circuit
  2. IAT sensor (built into MAF meter)
  3. ECM
 Comes on DTC stored DTC P0113 Intake Air Temperature Circuit High Input 
Engine Coolant Temperature Circuit
  1. Open or short in Engine Coolant Temperature (ECT) sensor circuit
  2. ECT sensor
  3. ECM
 Comes on DTC stored DTC P0115 Engine Coolant Temperature Circuit 
Engine Coolant Temperature Circuit Range / Performance Problem ECT sensor Comes on DTC stored DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem 
Engine Coolant Temperature Circuit Low Input
  1. Short in ECT sensor circuit
  2. ECT sensor
  3. ECM
 Comes on DTC stored DTC P0117 Engine Coolant Temperature Circuit Low Input 
Engine Coolant Temperature Circuit High Input
  1. Open in ECT sensor circuit
  2. ECT sensor
  3. ECM
 Comes on DTC stored DTC P0118 Engine Coolant Temperature Circuit High Input 
Engine Coolant Temperature / Intake Air Temperature Correlation
  1. Intake Air Temperature (IAT) sensor
  2. Engine Coolant Temperature (ECT) sensor
  3. ECM
 Comes on DTC stored  
Throttle / Pedal Position Sensor / Switch "A" Circuit
  1. Throttle Position (TP) sensor (built into throttle body)
  2. ECM
 Comes on DTC stored  
Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem TP sensor (built into throttle body) Comes on DTC stored DTC P0121 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" Circuit Range / Performance Problem 
Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input
  1. TP sensor (built into throttle body)
  2. Short in VTA1 circuit
  3. Open in VC circuit
  4. ECM
 Comes on DTC stored DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT 
Throttle / Pedal Position Sensor / Switch "A" Circuit High Input
  1. TP sensor (built into throttle body)
  2. Open in VTA1 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA1 circuits
  5. ECM
 Comes on DTC stored DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; 
Insufficient Coolant Temperature for Closed Loop Fuel Control
  1. Cooling system
  2. ECT sensor
  3. Thermostat
 Comes on DTC stored DTC P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control 
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
  1. Thermostat
  2. Cooling system
  3. ECT sensor
  4. ECM
 Comes on DTC stored DTC P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) 
Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
  1. HO2 sensor (sensor 2)
  2. A/F sensor (sensor 1)
  3. Gas leak from exhaust system
  4. Fuel pressure
  5. Fuel injector
  6. PCV valve and hose
  7. Air induction system
 Comes on DTC stored DTC P0136 Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) 
Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2)
  1. Open or short in HO2 sensor circuit
  2. HO2 sensor (sensor 2)
  3. HO2 sensor heater (sensor 2)
  4. A/F sensor (sensor 1)
  5. Gas leak from exhaust system
 Comes on DTC stored DTC P0137 Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2) 
Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)
  1. Short in HO2 sensor (sensor 2) circuit
  2. HO2 sensor (sensor 2)
  3. ECM internal circuit malfunction
  4. A/F sensor (sensor 1)
 Comes on DTC stored DTC P0138 Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2) 
Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
  1. Open or short in HO2 sensor circuit
  2. HO2 sensor heater (sensor 2)
  3. ECM
 Comes on DTC stored DTC P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) 
System Too Lean (Bank 1)
  1. Air induction system
  2. Injector blockage
  3. Mass Air Flow (MAF) meter
  4. Engine Coolant Temperature (ECT) sensor
  5. Fuel pressure
  6. Gas leakage from exhaust system
  7. Open or short in A/F sensor (sensor 1) circuit
  8. A/F sensor (sensor 1)
  9. A/F sensor heater (sensor 1)
  10. EFI relay
  11. A/F sensor heater and EFI relay circuits
  12. PCV hose connections
  13. PCV valve and hose
  14. ECM
 Comes on DTC stored DTC P0171 System Too Lean (Bank 1) 
System Too Rich (Bank 1)
  1. Injector leakage or blockage
  2. MAF meter
  3. ECT sensor
  4. Ignition system
  5. Fuel pressure
  6. Gas leakage from exhaust system
  7. Open or short in A/F sensor (sensor 1) circuit
  8. A/F sensor (sensor 1)
  9. A/F sensor heater (sensor 1)
  10. EFI relay
  11. A/F sensor heater and EFI relay circuits
  12. ECM
 Comes on DTC stored DTC P0172 System Too Rich (Bank 1) 
Throttle / Pedal Position Sensor / Switch "B" Circuit
  1. Throttle Position (TP) sensor (built into throttle body)
  2. ECM
 Comes on DTC stored DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT 
Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input
  1. TP sensor (built into throttle body)
  2. Short in VTA2 circuit
  3. Open in VC circuit
  4. ECM
 Comes on DTC stored P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT 
Throttle / Pedal Position Sensor / Switch "B" Circuit High Input
  1. TP sensor (built into throttle body)
  2. Open in VTA2 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA2 circuits
  5. ECM
 Comes on DTC stored DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT 
Random / Multiple Cylinder Misfire Detected
  1. Open or short in engine wire harness
  2. Connector connections
  3. Vacuum hose connections
  4. Ignition system
  5. Injector
  6. Fuel pressure
  7. Mass Air Flow (MAF) meter
  8. Engine Coolant Temperature (ECT) sensor
  9. Compression pressure
  10. Valve clearance
  11. Valve timing
  12. PCV hose connections
  13. Air induction system
  14. ECM
 Comes on or flashes DTC stored DTC P0300 Random / Multiple Cylinder Misfire Detected 
Cylinder 1 Misfire Detected Same as DTC P0300 Comes on or flashes DTC stored DTC P0301 Cylinder 1 Misfire Detected 
Cylinder 2 Misfire Detected Same as DTC P0300 Comes on or flashes DTC stored DTC P0302 Cylinder 2 Misfire Detected 
Cylinder 3 Misfire Detected Same as DTC P0300 Comes on or flashes DTC stored DTC P0303 Cylinder 3 Misfire Detected 
Cylinder 4 Misfire Detected Same as DTC P0300 Comes on or flashes DTC stored DTC P0304 Cylinder 4 Misfire Detected 
Knock Sensor 1 Circuit
  1. Open or short in knock sensor circuit
  2. Knock sensor
  3. ECM
 Comes on DTC stored DTC P0325 Knock Sensor 1 Circuit 
Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
  1. Short in knock sensor circuit
  2. Knock sensor
  3. ECM
 Comes on DTC stored DTC P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) 
Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
  1. Open in knock sensor circuit
  2. Knock sensor
  3. ECM
 Comes on DTC stored DTC P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor) 
Crankshaft Position Sensor "A" Circuit
  1. Open or short in Crankshaft Position (CKP) sensor circuit
  2. CKP sensor
  3. Sensor plate (CKP sensor plate)
  4. ECM
 Comes on DTC stored DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT 
Crankshaft Position Sensor "A" Circuit Intermittent Same as DTC P0335 Does not come on DTC stored DTC P0339 CRANKSHAFT POSITION SENSOR "A" Circuit Intermittent 
Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
  1. Open or short in Camshaft Position (CMP) sensor circuit
  2. CMP sensor
  3. Camshaft
  4. Timing chain has jumped tooth
  5. ECM
 Comes on DTC stored DTC P0340 CAMSHAFT POSITION SENSOR "A" CIRCUIT (BANK 1 OR SINGLE SENSOR) 
Camshaft Position Sensor "A" Circuit Range / Performance (Bank 1 or Single Sensor) Same as DTC P0340 Comes on Comes on  
Ignition Coil "A" Primary / Secondary Circuit
  1. Ignition system
  2. Open or short in IGF or IGT circuit (1 to 4) between ignition coil with igniter and ECM
  3. No. 1 to No. 4 ignition coil with igniters
  4. ECM
 Comes on* DTC stored DTC P0351 IGNITION COIL "A" PRIMARY / SECONDARY CIRCUIT 
Ignition Coil "B" Primary / Secondary Circuit Same as DTC P0351 Comes on* DTC stored DTC P0352 IGNITION COIL "B" PRIMARY / SECONDARY CIRCUIT 
Ignition Coil "C" Primary / Secondary Circuit Same as DTC P0351 Comes on* DTC stored DTC P0353 IGNITION COIL "C" PRIMARY / SECONDARY CIRCUIT 
Ignition Coil "D" Primary / Secondary Circuit Same as DTC P0351 Comes on* DTC stored DTC P0354 IGNITION COIL "D" Primary / Secondary Circuit 
Catalyst System Efficiency Below Threshold (Bank 1)
  1. Gas leakage from exhaust system
  2. A/F sensor (sensor 1)
  3. Heated Oxygen (HO2) sensor (sensor 2)
  4. Front exhaust pipe (Three-Way Catalytic Converter (TWC))
 Comes on DTC stored DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) 
Evaporative Emission System Reference Orifice Clog Up
  1. Pump module
  2. Connector/Wire harness
  3. EVAP system hose
  4. ECM
 Comes on DTC stored DTC P043E Evaporative Emission System Reference Orifice Clog Up 
Evaporative Emission System Reference Orifice High Flow
  1. Pump module
  2. Connector/Wire harness
  3. EVAP system hose
  4. ECM
 Comes on DTC stored DTC P043F Evaporative Emission System Reference Orifice High Flow 
Evaporative Emission Control System Incorrect Purge Flow
  1. Purge valve
  2. Connector/Wire harness (between purge valve and ECM)
  3. Leakage from EVAP line (between purge valve and intake manifold)
  4. ECM
 Comes on DTC stored DTC P0441 Evaporative Emission Control System Incorrect Purge Flow 
Evaporative Emission Control System Pressure Sensor / Switch
  1. Pump module (including pressure sensor)
  2. ECM
 Comes on DTC stored DTC P0450 Evaporative Emission Control System Pressure Sensor / Switch 
Evaporative Emission Control System Pressure Sensor Range / Performance
  1. Pump module (including pressure sensor)
  2. Connector/Wire harness
  3. EVAP system hose
  4. ECM
 Comes on DTC stored DTC P0451 Evaporative Emission Control System Pressure Sensor Range / Performance 
Evaporative Emission Control System Pressure Sensor / Switch Low Input
  1. Pump module (including pressure sensor)
  2. Connector/Wire harness
  3. EVAP system hose
  4. ECM
 Comes on DTC stored DTC P0452 Evaporative Emission Control System Pressure Sensor / Switch Low Input 
Evaporative Emission Control System Pressure Sensor / Switch High Input
  1. Pump module (including pressure sensor)
  2. Connector/Wire harness
  3. EVAP system hose
  4. ECM
 Comes on DTC stored DTC P0453 Evaporative Emission Control System Pressure Sensor / Switch High Input 
Evaporative Emission Control System Leak Detected (Gross Leak)
  1. Fuel tank cap (loose)
  2. Leakage from EVAP line (between canister and fuel tank)
  3. Leakage from EVAP line (between purge valve and canister)
  4. Pump module
  5. Leakage from fuel tank
  6. Leakage from canister
 Comes on DTC stored DTC P0455 Evaporative Emission Control System Leak Detected (Gross Leak) 
Evaporative Emission Control System Leak Detected (Very Small Leak) Same as DTC P0455 Comes on DTC stored DTC P0456 Evaporative Emission Control System Leak Detected (Very Small Leak) 
Vehicle Speed Sensor "A"
  1. Open or short in speed sensor circuit
  2. Vehicle speed sensor
  3. Combination meter
  4. ECM
  5. Skid control ECU
 Comes on DTC stored DTC P0500 VEHICLE SPEED SENSOR "A" 
Brake Switch "A" / "B" Correlation
  1. Short in stop light switch signal circuit
  2. STOP fuse
  3. Stop light switch
  4. ECM
 Does not come on DTC stored DTC P0504 BRAKE SWITCH "A" / "B" Correlation 
Idle Control System Malfunction
  1. ETCS (Electronic Throttle Control System)
  2. Air induction system
  3. PCV hose connections
  4. ECM
 Comes on DTC stored DTC P0505 Idle Control System Malfunction 
Cold Start Idle Air Control System Performance
  1. Throttle body
  2. Mass air flow (MAF) meter
  3. PCV system
  4. Air cleaner filter element
  5. Air induction system
  6. VVT system
  7. ECM
 Comes on DTC stored DTC P050A Cold Start Idle Air Control System Performance 
System Voltage
  1. Open in back up power source circuit
  2. EFI fuse
  3. ECM
 Comes on DTC stored DTC P0560 System Voltage 
Internal Control Module Memory Check Sum Error ECM Comes on DTC stored DTC P0601 Internal Control Module Memory Check Sum Error 
Internal Control Module Random Access Memory (RAM) Error ECM Comes on DTC stored DTC P0604 Internal Control Module Random Access Memory (RAM) Error 
ECM / PCM Processor
  1. Exhaust gas leak
  2. HO2 sensor
  3. ECM
 Comes on DTC stored DTC P0606 ECM / PCM Processor 
Control Module Performance ECM Comes on DTC stored DTC P0607 Control Module Performance 
Starter Relay Circuit High
  1. Park/Neutral Position (PNP) switch (A/T)
  2. Clutch pedal switch (M/T)
  3. Starter relay circuit
  4. Ignition switch
  5. ECM
 Comes on DTC stored DTC P0617 Starter Relay Circuit High 
VIN not Programmed or Mismatch - ECM/PCM ECM Comes on DTC stored DTC P0630 VIN not Programmed or Mismatch - ECM / PCM 
Actuator Supply Voltage Circuit / Open ECM Comes on DTC stored DTC P0657 Actuator Supply Voltage Circuit / Open 
Throttle Actuator Control Motor Circuit Low
  1. Open in throttle actuator circuit
  2. Throttle actuator
  3. ECM
 Comes on DTC stored DTC P2102 Throttle Actuator Control Motor Circuit Low 
Throttle Actuator Control Motor Circuit High
  1. Short in throttle actuator circuit
  2. Throttle actuator
  3. Throttle valve
  4. Throttle body
  5. ECM
 Comes on DTC stored DTC P2103 Throttle Actuator Control Motor Circuit High 
Throttle Actuator Control System - Stuck Open
  1. Throttle actuator
  2. Throttle body
  3. Throttle valve
 Comes on DTC stored DTC P2111 Throttle Actuator Control System - Stuck Open 
Throttle Actuator Control System - Stuck Closed Same as DTC P2111 Comes on DTC stored DTC P2112 Throttle Actuator Control System - Stuck Closed 
Throttle Actuator Control Motor Current Range / Performance
  1. Open in ETCS (Electronic Throttle Control System) power source circuit
  2. ECM
  3. ETCS fuse
 Comes on DTC stored DTC P2118 Throttle Actuator Control Motor Current Range / Performance 
Throttle Actuator Control Throttle Body Range / Performance
  1. ETCS
  2. ECM
 Comes on DTC stored DTC P2119 Throttle Actuator Control Throttle Body Range / Performance 
Throttle / Pedal Position Sensor / Switch "D" Circuit
  1. Accelerator Pedal Position (APP) sensor
  2. ECM
 Comes on DTC stored DTC P2120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "D" CIRCUIT;  
Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance
  1. APP sensor circuit
  2. APP sensor
  3. ECM
 Comes on DTC stored DTC P2121 THROTTLE / PEDAL POSITION SENSOR / SWITCH "D" Circuit Range / Performance 
Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input
  1. APP sensor
  2. Open in VCP1 circuit
  3. Open or ground short VPA circuit
  4. ECM
 Comes on DTC stored DTC P2122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "D" CIRCUIT LOW INPUT 
Throttle / Pedal Position Sensor / Switch "D" Circuit High Input
  1. APP sensor
  2. Open in EPA circuit
  3. ECM
 Comes on DTC stored DTC P2123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "D" CIRCUIT HIGH INPUT 
Throttle / Pedal Position Sensor / Switch "E" Circuit
  1. APP sensor
  2. ECM
 Comes on DTC stored DTC P2125 THROTTLE / PEDAL POSITION SENSOR / SWITCH "E" CIRCUIT 
Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input
  1. APP sensor
  2. Open in VCP2 circuit
  3. Open or ground short VPA2 circuit
  4. ECM
 Comes on DTC stored DTC P2127 THROTTLE / PEDAL POSITION SENSOR / SWITCH "E" CIRCUIT LOW INPUT 
Throttle / Pedal Position Sensor / Switch "E" Circuit High Input
  1. APP sensor
  2. Open in EPA2 circuit
  3. ECM
 Comes on DTC stored DTC P2128 THROTTLE / PEDAL POSITION SENSOR / SWITCH "E" CIRCUIT HIGH INPUT 
Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation
  1. Short between VTA1 and VTA2 circuits
  2. Throttle Position (TP) sensor (built into throttle body)
  3. ECM
 Comes on DTC stored DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" Voltage Correlation 
Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation
  1. Short between VPA and VPA2 circuit
  2. APP sensor
  3. ECM
 Comes on DTC stored DTC P2138 THROTTLE / PEDAL POSITION SENSOR / SWITCH "D" / "E" Voltage Correlation 
Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)
  1. Open or short in A/F sensor (sensor 1) circuit
  2. A/F sensor (sensor 1)
  3. A/F sensor heater (sensor 1)
  4. EFI relay
  5. A/F sensor heater and EFI relay circuits
  6. Air induction system
  7. Fuel pressure
  8. Injector
  9. ECM
 Comes on DTC stored DTC P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1) 
Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1) Same as DTC P2195 Comes on DTC stored DTC P2196 Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1) 
Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)
  1. Open in A/F sensor circuit
  2. A/F sensor
  3. ECM
 Comes on DTC stored DTC P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1);  
Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
  1. Open or short in A/F sensor circuit
  2. A/F sensor
  3. A/F sensor heater
  4. EFI relay
  5. A/F sensor heater and EFI relay circuits
  6. ECM
 Comes on DTC stored DTC P2238 Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1) 
Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1) Same as DTC P2238 Comes on DTC stored DTC P2239 Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1) 
Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1) Same as DTC P2238 Comes on DTC stored DTC P2252 Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1) 
Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1) Same as DTC P2238 Comes on DTC stored DTC P2253 Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1) 
Evaporative Emission System Leak Detection Pump Control Circuit Low
  1. Pump module
  2. Connector/Wire harness (between pump module and ECM)
  3. ECM
 Comes on DTC stored DTC P2401 Evaporative Emission System Leak Detection Pump Control Circuit Low 
Evaporative Emission System Leak Detection Pump Control Circuit High
  1. Pump module
  2. Connector/Wire harness (between pump module and ECM)
  3. ECM
 Comes on DTC stored DTC P2402 Evaporative Emission System Leak Detection Pump Control Circuit High 
Evaporative Emission System Switching Valve Control Circuit Low
  1. Pump module
  2. Connector/Wire harness (between pump module and ECM)
  3. ECM
 Comes on DTC stored DTC P2419 Evaporative Emission System Switching Valve Control Circuit Low 
Evaporative Emission System Switching Valve Control Circuit High
  1. Pump module
  2. Connector/Wire harness (between pump module and ECM)
  3. ECM
 Comes on DTC stored DTC P2420 Evaporative Emission System Switching Valve Control Circuit High 
ECM / PCM Internal Engine Off Timer Performance ECM Comes on DTC stored DTC P2610 ECM / PCM Internal Engine Off Timer Performance 
A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)
  1. Open or short in A/F sensor (sensor 1) circuit
  2. A/F sensor (sensor 1)
  3. A/F sensor heater (sensor 1)
  4. EFI relay
  5. A/F sensor heater and EFI relay circuits
  6. Air induction system
  7. Fuel pressure
  8. Injector
  9. PCV valve and hose
  10. PCV hose connections
  11. ECM
 Comes on DTC stored DTC P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1) 
*: Indicates a malfunction related to the primary circuit
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