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)provides an overview of each diagnostic category.

DTC Descriptor
DTC P1400 00
- Cold Start Emission Reduction Control System

Circuit/System Description

The catalyst must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalyst. 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

* DTCs P0101 00, P0102 00, P0103 00, P0106 00, P0107 00, P0108 00, P0112 00, P0113 00, P0114 00, P0116 00, P0117 00, P0118 00, P0121 00, P0122 00, P0123 00, P0222 00, P0223 00, P0201 00, P0202 00, P0203 00, P0204 00, P0300 00, P0301 00, P0302 00, P0303 00, P0304 00, P0335 00, P0336 00, P0351 00, P0352 00, P0353 00, P0354 00, P0502 00, P0503 00, P0506 00, P0507 00, P0641 00, P0651 00, P0697 00, P06A3 00, P0806 00, P0807 00, P080A 00, P2122 00, P2123 00, P2125 00, P2127 00, P2128 00, P2135 00, and P2138 00 are not set.
* The engine is idling less than 30 s.
* The Engine Coolant Temperature (ECT) sensor is greater than -10°C (14°F).
* The calculated three way catalyst temperature is less than 350°C (662°F).
* The ECM will exit the diagnostic if the calculated three way catalyst temperature is greater than 420°C (788°F) when the engine run time is greater than 30 s.
* The ECM will exit the diagnostic if the engine run time is greater than 90 s.
* The vehicle speed is less than 2 km/h (1 MPH).
* The engine is at idle with no input from the accelerator pedal.
* The clutch pedal position switch is less than 10% or greater than 80%, manual transmissions only.

This DTC runs within the first 90 s 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 00 is a Type A DTC.

Conditions for Clearing the DTC

DTC P1400 00 is a Type A DTC.

Reference Information
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Ignition OFF, allow the engine to cool.
2. Engine idling for at least 2 min, observe the scan tool DTC information. DTC P1400 00 should run and pass.
3. 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 (1.6L LDE, LXV, 1.8L 2H0, and LUW) (Testing and Inspection)
* Water intrusion
* Vacuum leak and other unmetered 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, or modified exhaust system. Refer to Symptoms - Engine Exhaust (Symptoms - Engine Exhaust)

3. Inspect for an engine mechanical condition 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.