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Tahoe / Yukon Service Manual

DTC P2227-P2230

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5507638 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 P2227 Barometric Pressure Sensor Performance DTC P2228 Barometric Pressure Sensor Circuit Low DTC P2229 Barometric Pressure Sensor Circuit High DTC P2230 Barometric Pressure Sensor Circuit Erratic Circuit/System Description For an overview of the component/system, refer to: Engine Control Module Description

Component Description
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

Conditions for Running the DTC P2227 Condition 1 DTC P0100-P0103, P0107, P0108, P0116-P0119, P0128, P0201-P0208, P020A- P020F, P0216, P021A, P021B, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282, P0283, P02E8, P02E9, P02EE, P02EF, P02F0- P02F5, P0335, P0336, P062B, P062D, P111E, P122D, P1248, P1249, P124A- P124F, P126A, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2228- P2230, P227E, U0654 = Not set Engine = Running — For greater than 30 s Engine Coolant Temperature = Warmer than 70°C (158°F) Engine Speed = Less than 950 RPM Ignition Voltage = Greater than 11 V Intake Air Flow Valve Position = Greater than 90% Condition 2, 3 DTC P0107, P0108, P2228, P2229, P227C, P227D, P2610, U060F = Not set Engine = Off — For greater than 5 s Ignition = On Frequency the DTC runs = Continuously — After the running conditions are met P2228, P2229, P2230 Ignition = On or Engine = Running Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P2227 Condition 1 The following parameters are not within 46 kPa (6.7 PSI) of each other: Barometric Pressure Sensor Barometric Pressure Sensor 2 Manifold Absolute Pressure Sensor Condition 2 Barometric Pressure Sensor = Not between 50 and 115 kPa (7 and 17 PSI) Condition 3 The following parameters are not within 10 kPa (1.5 PSI) of each other: Barometric Pressure Sensor Barometric Pressure Sensor 2 Manifold Absolute Pressure Sensor The above condition(s) must occur for greater than 1 s. P2228 Signal circuit = Less than 45 kPa (6.5 PSI) — For greater than 5 s P2229 Signal circuit = Greater than 115 kPa (16.7 PSI) — For greater than 5 s P2230 Signal circuit = Signal noisy or erratic — For greater than 5 s 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 the scan tool parameter: Barometric Pressure Sensor 2 = The value should be within the range listed in the table: Altitude Versus Barometric Pressure Manifold Absolute Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure ⇒ If not in the specified range { 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
  3. Verify the scan tool parameter: Barometric Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure ⇒ If not in the specified range
  4. Ignition/Vehicle » Off
  5. Verify a condition does not exist with the component: Vent @ K20 Engine Control Module Debris / Dirty Moisture / Ice / Water ⇒ If a condition exists Repair or replace as necessary ⇓ If no conditions exist
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Replace the component: K20 Engine Control Module ⇓ If the DTC is not set
  7. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Engine Control Module Replacement — K20 Engine Control Module For control module replacement, programming, and setup refer to: Control Module References Additional Procedures Barometric Pressure Sensor Reset — Perform only when the following component/system is replaced or serviced: K20 Engine Control Module — Replaced
  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.