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Tahoe / Yukon Service Manual

DTC P062D

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5336068 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 P062D Control Module Fuel Injector Driver Performance Circuit/System Description The control module monitors the fuel injector supply voltage to determined if the voltage is within a calibrated range. Conditions for Running the DTC Battery Voltage = Greater than 11 V Engine = Running Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Condition 1 Control module K20 detects: Open/High Resistance @ Ignition circuit — For less than 1 s Condition 2 Control module K20 detects: Internal Malfunction — For less than 1 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Diagnostic Aids High resistance in the circuits of the component Q17 may set DTC P062D without setting control circuit DTC(s). 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 there are no DTCs set related to the following component/system: KR75 Engine Controls Ignition Relay ⇒ If a related DTC is set Refer to: DTC P0685-P0687, P0689, P0690, P1682, P16BC, P16BD, or P16BF ⇓ If a related DTC is not set
  3. Engine » Cranking — For 10 s Verify the function: Engine = Running ⇒ If the function does not work Refer to: Circuit/System Testing ⇓ If the function works
  4. Verify a condition does not exist with the component: Engine — The engine should not stumble/stall. Perform the action while monitoring the component: Wiggle the harness and connector: K20 Engine Control Module Wiggle the harness and connector: X50A Fuse Block - Underhood ⇒ If a condition exists Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s) ⇓ If no condition exists
  5. 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 Refer to: Circuit/System Testing ⇓ If the DTC is not set
  6. All OK. Circuit/System Testing
  7. Ignition/Vehicle & All vehicle systems » Off
  8. Verify the fuse is not open: F90UA Fuse @ X50A Fuse Block - Underhood ⇒ If the fuse is open 2.1. Disconnect the electrical connector: X1 @ K20 Engine Control Module 2.2. Test for infinite resistance between the test points: Output terminal @ F90UA Fuse & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: K20 Engine Control Module ⇓ If the fuse is not open
  9. Disconnect the electrical connector: X1 @ K20 Engine Control Module
  1. Test for less than 2 Ω between the test points: { Sierra / Silverado } Ignition circuit terminal 46 @ Control module harness & Output terminal @ F90UA Fuse { Escalade / Tahoe / Yukon } Ignition circuit terminal 69 @ Control module harness & Output terminal @ F90UA Fuse ⇒ If 2 Ω or greater Repair the open/high resistance in the circuit. ⇓ If less than 2 Ω
  2. Replace the component: K20 Engine Control Module Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References