Circuit Description

While engine is warming, PCM monitors the ECT sensor to determine how long it takes engine to reach the coolant temperature required for closed loop operation. DTC P0126 will set if PCM determines that the engine does not reach closed loop operation in a specified amount of time. This test will run if either the IAT or ECT is too low at start up. PCM will only run this DTC on a cold start and only once per cold start.

DTC will set when the following conditions are present:

• Engine has been running for more than 600 seconds.
• DTCs P0112, P0113, P0117 and P0118 are not set.
• Engine coolant temperature at less than 133°F (56°C).
• Intake air temperature is greater than 20°F (-7°C).
• Fuel burned since start is greater than 1,000,000 cu. mm.
• Total idle time since start up is less than 450 seconds.

Or

• Engine run time is greater than 300 seconds.
• DTCs P0112, P0113, P0117 and P0118 are not set.
• Engine coolant temperature is less than 133°F (56°C).
• Intake air temperature is greater than 20°F (-7°C).
• Fuel burned since start is greater than 468,120 cu. mm.