2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2794

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2794

Inspection/Symptom Related Diagnostic Procedures/Symptoms - Antilock Brake System) for the ABS - Non-Hybrid Less than 3900 kg

(8600 lb) GVW

* Symptoms - Antilock Brake System (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and

Inspection/Symptom Related Diagnostic Procedures/Symptoms - Antilock Brake System) for the ABS - Non-Hybrid Greater than/Equal

to 3900 kg (8600 lb) GVW

4. 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.

Repair Instructions

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

P1400

DTC P1400

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/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