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DTC P1400

DTC P1400

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC P1400

Cold Start Emission Reduction Control System

Circuit/System Description

The catalytic converter must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:


• Engine speed

• Spark advance

• Throttle position

• Engine airflow

• Engine coolant temperature

• Engine run time

• Park/Neutral position

• Vehicle speed


The actual model is then compared to the expected exhaust energy model.

Conditions for Running the DTC


• The engine is running, and a cold start has been detected.

• The vehicle speed is less than 2 km/h (1 mph).

• The catalyst temperature is greater than 1,000°C (1,832°F).

• The coolant temperature is greater than 56°C (133°F).

• The engine run time is greater than 18 s.

• The engine is at idle with no input from the accelerator pedal for greater than 5 s.

• DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0201, P0202, P0203, P0204, P0300, P0335, P0336, P0351, P0352, P0353, P0506, P0507, P0601, P0602, P0603, P0604, P0606, P0607, P062F, P0641, P0651, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.

• The DTC sets within 15 seconds within the first 2 minutes at start up. The diagnostic runs once per trip when a cold start has been detected.


Conditions for Setting the DTC

The actual exhaust energy model does not match the expected exhaust energy model.

Action Taken When the DTC Sets

DTC P1400 is a Type A DTC.

Conditions for Clearing the MIL/DTC

DTC P1400 is a Type A DTC.

Diagnostic Aids

Any loading of the engine that lowers engine RPM, such as partial application of the clutch, A/C cycling, etc. during the first 120 seconds of the engine run time may set this DTC.

Circuit/System Verification


1. Allow the engine to cool until the catalyst temperature is less than 500°C (932°F) and the engine coolant is greater than -10°C (+14°F).

2. Idle the engine for greater than 2 minutes.

3. Observe DTC Information on the scan tool. DTC P1400 should not be generated.

4. Run the vehicle within the Conditions for Running the DTCs. You may also operate the vehicle within the conditions that you have noted from the Freeze Frame/Failure Records data.


Circuit/System Testing


1. Inspect the air intake system for the following:

• Modified, damaged, or restricted

• Dirty or deteriorating air filter element

• Crankcase ventilation system for correct operation.

• Water intrusion

• Vacuum leak and other unmetered air downstream of the MAF sensor

• Intake manifold leak

2. Inspect the exhaust system for the following:

• Water intrusion

• Exhaust Leakage

• Damaged, restricted, modified or enhanced exhaust system.

3. Inspect the engine mechanical for items that could alter the air flow into the combustion chamber.