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
- Cold Start Injection Monitoring

Circuit/System Description

The engine control module (ECM) controls the fuel injection pulses. There are three types of injection events during engine warm-up. A Pre-Injection Pulse that is used to warm the combustion chamber before the Main Injection Pulse that creates the engines power, and a Post Injection Pulse that is used to create heat in the diesel oxidation catalyst. During engine warm-up the ECM monitors the amount of time the diesel oxidation catalyst takes to reach operating temperature.

Conditions for Running the DTC

* Engine is in Exhaust Warm-up mode.
* DTC runs continuously when the above condition exists.

Conditions for Setting the DTC

Post Injection has been prohibited for 100 continuous engine revolutions for any one of the following reasons:

* Post injection events do not increase the diesel oxidation catalyst temperature to a calibrated level within a given time.
Or
* A post injection event overlaps the pre-injection event of the next cylinder in the firing order.
Or
* The ECM detects a post injection energizing error.

Action Taken When the DTC Sets

DTC P1400 is a Type B DTC.

Conditions for Clearing the DTC

DTC P1400 is a Type B DTC.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Fuel System Description (Fuel System Description)
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. Verify that no other DTC's are set.

• If other DTC are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. 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. Insect the air intake system for the following:

* Damage, restriction, or modification
* Dirty or deteriorating air filter element
* Un-metered air downstream of the mass air flow (MAF) sensor

2. Inspect the exhaust system for the follow:

* Damaged, restricted, modified or enhanced exhaust system
* Exhaust leak

3. If none of the above conditions exist, replace the Q17 fuel injectors.

Repair Instructions

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

* Fuel Injector Replacement (Left Side) (Fuel Injector Replacement (Left Side)) Fuel Injector Replacement (Right Side) (Fuel Injector Replacement (Right Side))
* Perform the Fuel Injector Flow Rate Programming (Procedures) procedure after replacement of a fuel injector.
* Control Module References (Programming and Relearning) for ECM replacement, programming, and setup.