P2610 PCM Internal Engine Off Timer Performance

P2610 code - The purpose of the shut down timer diagnostic is to determine if the PCM internal clock is running as expected. This engine off timer is used as an enable condition for various OBD monitors. The rationality test consists of two test used to evaluate shut down time.

P2610 code

During an initial engine start, if it is determined that the engine start is a cold start (determined by comparing the engine coolant temperature versus ambient temperature), the slow test will be rund and a long shut down time would be expected. If it is determined that the engine start is not a cold start, the fast test will be run and a shutdown time is expected because the engine has not been cooled down to cold start conditions.
- The P1607 DTC will set if the slow test diagnostic runs and fails
- The P2610 DTC will set if the fast test diagnostic runs and fails

This diagnostic runs once per ignition cycle when the following conditions are met:
- Shortly after an initial engine start
- The difference between the coolant temperature and ambient air temperature is greater than 15°C (59°F) at initial engine start
- The engine coolant temperature recorded at the last engine shut down above 83°C (181.4°F). If the previous engine shut down temperature was not above this value, the shut down diagnostic will not be performed during this ignition cycle.
- There was a minimum of 10°C (50°F) temperature drop during the last ignition off.
- If the above monitoring conditions are met, the PCM uses the engine coolant temperature drop to calculate a maximum engine off time threshold. It then compares the previous key time to the calibrated maximum threshold.

Set condition this DTC the PCM determines that the actual previous key off time is above the calculated threshold this fault is set. Default action the MIL is illuminate.

Possible causes P2610 code
- Cooling system issues
- Ambient air temperature (AAT) sensor
- Engine coolant temperature (ECT) sensor
- Powertrain Control Module (PCM) software
- Powertrain Control Module (PCM)

Diagnostic test P2610 code

Step 1. Check the Powertrain Control Module (PCM) software level

An aftermarket block heater installed may cause this DTC to set.
Turn the ignition on, with the scan tool verify that the PCM is operating at the latest software version available. Perform any service bulletins or PCM flash updates that may apply.

Were any service bulletins or PCM flash updates available for this condition?

Yes, perform the appropriate repair.
No, go to step 2.

Step 2. Check the AAT sensor operation

Turn the ignition off, allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and above -7°C (19.4°F) until the engine coolant temperature is equal, or close to the environmental ambient temperature.
Turn the ignition on, with the scan tool compare the AAT sensor value to the current ambient temperature.

Is the AAT sensor value within 10°C (18°F) of the current ambient temperature?

Yes, go to step 3.
No, perform the PCM intermittent condition.

Step 3. Low coolant level

Never open the cooing system when the engine is hot. The system is under pressure. Failure to follow these instructions can result in personal injury including extreme burn, scalding, or fatal injury. Allow the engine the cool before opening the cooling system.

Check the cooling system to make sure that the coolant is in good condition and at the proper level.

Is the coolant level and condition OK?

Yes, go to step 4.
No, inspect the vehicle for a coolant leaks and add the necessary amount of coolant.

Step 4. Check the cooling system operation

If engine coolant temperature is above 65°C (149°F), allow the engine to cool until it is below 65°C
(149°F). Start the engine, during engine warmup monitor the engine coolant temperature degree value. The temperature value change should be a smooth transition form start up to normal operating temp 82°C (180°F). Also monitor the actual coolant temperature with a digital thermometer at or near the ACT sensor and thermostat positions.

As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the scan tool engine coolant temperature degree values should stay relatively close to each other.

Was the digital thermometer readings relatively close to the scan tool reading for the ECT sensor?

Yes, go to step 5.
No, replace the ECT sensor.

Step 5. Check related PCM and component connections

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