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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 provide an overview of each diagnostic category.

DTC Descriptor

DTC P1400: 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 spark timing is altered to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:

    • Spark advance
    • Engine airflow
    • Engine coolant temperature
    • Engine run time

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

Conditions for Running the DTC
    • DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0114, P0116, P0117, P0118, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0335, P0336, P0351, P0352, P0353, P0354, P0641, P0651, P0697, P06A3, P2122, P2123, P2127, P2128, P2135, and P2138 are not set.
    • The engine coolant temperature (ECT) sensor is greater than -10°C (14°F).
    • The calculated 3-way catalyst temperature is less than 350°C (662°F).
    • The engine control module (ECM) will exit the diagnostic if the calculated 3-way catalyst temperature is greater than 550°C (1022°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 a calibrated value.
    • This DTC runs within the first 15 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 is a Type A DTC.

Conditions for Clearing the DTC

DTC P1400 is a Type A DTC.

Reference Information

Description and Operation

Hybrid Modes of Operation Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Vehicle OFF, allow the engine to cool to be within the temperatures listed in the Conditions for Running the DTC.
  2. Engine running for at least 30 s, observe the scan tool DTC information. DTC P1400 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. Verify that none of the conditions listed below exists with the air inlet system:
    2. • Damage, restriction, or modification
    • Dirty or deteriorating air filter element
    • Crankcase ventilation system for correct operation.
    • Water intrusion
    • Vacuum leak and other unmetered air downstream of the mass air flow (MAF) sensor
    • Intake manifold leak
    ⇒If a condition is found, repair as necessary.
  2. Verify that none of the conditions listed below exists with the exhaust system:
    3. • Water intrusion
    • Exhaust leak
    • Damaged, restricted, or modified exhaust system - Refer to Symptoms - Engine Exhaust .
    ⇒If a condition is found, repair as necessary.
  3. If all of the above conditions test normal, inspect for an engine mechanical condition that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

   


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