2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2795

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2795

DTC P1400 is a Type A DTC.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Description and Operation

Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine Control

Module Description)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) 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 ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool hood position parameter displays Open.

瀚慖f the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

3. Allow the engine to cool until the catalyst temperature is less than 300掳C (572掳F) and the engine coolant is greater than 0.0掳C (32掳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 (See: Powertrain

Management/Emission Control Systems/Positive Crankcase Ventilation/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 (See: Engine, Cooling and

Exhaust/Exhaust System/Testing and Inspection/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 (

See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

Repair Instructions

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

P1516

DTC P1516, P2101, P2119, or P2176

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System