Conditions for Running the DTC

P2237

• DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P0338 are not set.
• The ignition voltage is between 10.7-18.1 volts.
• The engine is running.
• HO2S 1 voltage is between 1.48-1.52 volts.
• HO2S 1 heater is at operating temperature.
• HO2S 1 closed loop is active.
• The catalyst temperature is stable.
• DTC P2237 runs continuously when the above conditions are met for 2 seconds.

P2243

• DTCs P0030, P0031, P0032 are not set.
• The ignition voltage is between 10.7-18.1 volts.
• The engine is running.
• HO2S 1 heater is at operating temperature for at least 20 seconds.
• HO2S 1 internal resistance is more than 570 ohms.
• DTC P2243 runs continuously when the above conditions are met for 2 seconds.

P2251

• DTCs P0030, P0031, P0032 are not set.
• The ignition voltage is between 10.7-18.1 volts.
• The engine is running.
• The estimated exhaust temperature is less than 900°C (1,652°F).
• The HO2S 1 voltage is between 1.47-1.53 volts.
• The HO2S 1 heater temperature has been within the normal range for more than 20 seconds.
• HO2S 1 internal resistance is more than 570 ohms.
• The following are true for more than 30 seconds.
  • The HO2S 1 heater is ready.
  • The engine is running.
  • The ignition voltage is more than 11 volts.
• DTC P2251 runs continuously when the above conditions are met for 10 minutes.

P2626

• DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P0338 are not set.
• The ignition voltage is between 10.7-8.1 volts.
• The engine is running.
• Fuel cut-off is true.
• The estimated exhaust temperature is less than 750°C (1,382°F).
• The HO2S 1 heater is at operating temperature.
• DTC P2626 runs continuously when the above conditions are met for 4 seconds, or when the above conditions are met for 10 minutes if the fuel level is low.