TROUBLESHOOTING FOR DTC
DTC | Diagnostic item |
P0030 P0031 P0032 P0036 P0037 P0038 | Oxygen Sensor Heater Circuit Malfunction (Bank1, Sensor1) - Plausibilitycheck Oxygen Sensor Heater Check (Bank1, Sensor1) - Low Oxygen Sensor Heater Check (Bank1, Sensor1) - High Oxygen Sensor Heater Circuit Malfunction (Bank1, Sensor2) - Plausibilitycheck Oxygen Sensor Heater Check (Bank1, Sensor2) - Low Oxygen Sensor Heater Check (Bank1, Sensor2) - High |
DESCRIPTION
Refer to DTC P0130 & P0136.
FAILURE CONDITIONS
[FOR P0030, P0031, P0032]
After the engine runs for 3 minutes, the ECM checks the front oxygensensor heater circuit. If during two driving cycles the front oxygen sensor'sheater resistance is less than 4.6 ohms or greater than 19.5 ohms, the ECMwill set P0135 and MIL will turn on. This code indicates an unusually highor low resistance of the heater circuit being read by the front oxygen sensoror ECM.
[FOR P0036, P0037, P0038]
After the engine runs for 2 minutes, the ECM checks the rear oxygensensor heater circuit. If during two driving cycles the rear oxygen sensor'sheater resistance is less than 4.5 ohms or greater than 19.5 ohms, the ECMwill set P0141 and MIL will turn on. This code indicates an unusually highor low heater circuit resistance reading by the rear oxygen sensor orECM.
CIRCUIT DIAGRAM
TEST PROCEDURE