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Tahoe / Yukon Service Manual

DTC P00C7 or P1199

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5501033 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P00C7 Intake Air Pressure Measurement System - Multiple Sensors Not Plausible DTC P1199 Intake Air Pressure Measurement System Performance - Engine Running Circuit/System Description This system consists of the following components: B65 Intake Manifold Pressure and Air Temperature Sensor B75 Mass Air Flow Sensor — Barometric Pressure Sensor 2 K20 Engine Control Module — Barometric Pressure Sensor This DTC sets when the control module detects an inconsistency between the pressure sensors and cannot identify which sensor failed. Conditions for Running the DTC P00C7 DTC P0106-P0108, P0237, P0238, P2227-P2230, P2610 = Not set DTC P0107, P0108, P0237, P0238, P2228, P2229 = Not pending Barometric Pressure Sensor = 50 to 115 kPa (7.3 to 16.7 PSI) Barometric Pressure Sensor 2 = 50 to 115 kPa (7.3 to 16.7 PSI) Engine = Not Running Ignition and Start Signal = Greater than 11 V Manifold Absolute Pressure — = 50 to 115 kPa (7.3 to 16.7 PSI) Time between current ignition cycle and the last time the engine was running = Greater than 5 s Frequency the DTC runs = Continuously — After the running conditions are met P1199 DTC P0100-P0103, P0107, P0108, P0116-P0119, P0128, P0335, P0336, P020A-P020F, P0201-P0208, P021A, P021B, P0216, P0261, P0262, P0264, P0265, P0267, P0268, P0270- P0274, P0276, P0277, P0279, P0280, P0282, P0283, P02EE, P02EF, P02F0-P02F5, P02E8, P02E9, P062B, P062D, P111E, P122D, P124A-P124F, P126A, P1248, P1249,P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157 P2228-P2230, P227E, U0654 = Not set Calculated Fuel Flow = Less than a predefined threshold Engine Coolant Temperature = Warmer than 70°C (158°F) Engine Speed = Less than 950 RPM Ignition and Start Signal = Greater than 11 V Intake Air Flow Valve Position = Greater than 90% Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC The following scan tool parameters are not within a calibrated range of the calculated air flow: Barometric Pressure Sensor Barometric Pressure Sensor 2 Manifold Absolute Pressure Sensor Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Warning Message = Service Emission System /Service Exhaust Fluid System Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC P0106, P0107, P0108, P2227, P2228, P2229, P2230, P227B, P227C, P227D, P227E is not set. ⇒ If any of the DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If none of the DTCs are set
  3. Verify the following conditions do not exist: Q20 Intake Air Flow Valve — Loose Clamps / Visible Damage Air Cleaner Element — Dirty / Restricted Intake Air Duct & Intake Manifold — Cracked / Loose Clamps / Visible Damage B75 Mass Air Flow Sensor — Cracked / Loose Clamps / Visible Damage Air Inlet Valve — Barometric Pressure Sensor @ K20 Engine Control Module / Leaking / Missing / Clogged / Visible Damage O-Ring @ B65 Intake Manifold Pressure and Air Temperature Sensor / Leaking / Missing / Visible Damage Positive Crankcase Ventilation System — Leaking / Incorrect connection / Restricted ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists
  4. Verify the scan tool parameter: Barometric Pressure Sensor = Altitude Versus Barometric Pressure — The value should be within the range listed in the table. Barometric Pressure Sensor 2 = Altitude Versus Barometric Pressure — The value should be within the range listed in the table. Manifold Absolute Pressure Sensor = Altitude Versus Barometric Pressure — The value should be within the range listed in the table. ⇒ If not in the specified range { Barometric Pressure Sensor } Refer to: DTC P2227-P2230 { Barometric Pressure Sensor 2 } Refer to: DTC P227B-P227E { Manifold Absolute Pressure Sensor } Refer to: DTC P0106, P0107, or P0108 ⇓ If in the specified range
  5. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Additional Procedures
  1. Ignition » On / Vehicle » In Service Mode
  2. Verify that all scan tool Event Data parameters under the following data list displays No: Exhaust Gas Recirculation System Malfunction Warning Event Data ⇒ If not the specified state Operate the vehicle within the Conditions for Running the DTC for the DTC identified by the Event Data parameter displaying Yes. ⇓ If the specified state
  3. All OK.