P1400

DTC P1400

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide 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 runtime
* Park/neutral position
* Vehicle speed

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

Conditions for Running the DTC

* DTCs P0016, P0069, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0171, P0172, P0174, P0175, P0207, P0208, P0220, P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0308, P0335, P0336, P0351-P0358, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176 are not set.
* The engine is running, and a cold start has been detected.
* Vehicle speed is less than 2 km/h (1 mph).
* The engine is at idle with no input from the accelerator pedal for greater than 5 s.
* This DTC runs for 15 s within the first 2 min of start-up. This diagnostic runs once per trip when a cold start has been determined.

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.

Reference Information
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Description and Operation

Engine Control Module Description Description and Operation
Scan Tool Reference

Control Module References Control Module References for scan tool information

Diagnostic Aids

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

Circuit/System Verification

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description Hybrid Modes of Operation Description.
2. Ignition ON, verify the scan tool hood position parameter displays Open.

• If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.

3. Allow the engine to cool until the catalyst temperature is less than 300°C (572°F) and the engine coolant is greater than 0.0°C (32°F).
4. Idle the engine for greater than 2 min.
5. Observe the scan tool DTC information. DTC P1400 should not set.
6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Inspect the air intake system for the following:

* Damage, restriction, or modification
* Dirty or deteriorating air filter element
* Crankcase ventilation system for correct operation-Refer to Crankcase Ventilation System Inspection/Diagnosis Testing and Inspection.
* Water intrusion
* Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor
* Intake manifold leak

2. Inspect the exhaust system for the following:

* Water intrusion
* Exhaust leak
* Damaged, restricted, modified or enhanced exhaust system-Refer to Symptoms - Engine Exhaust Symptoms - Engine Exhaust.

3. Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical Symptoms - Engine Mechanical.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.