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Tahoe / Yukon Service Manual

DTC P0196-P0199 (L3B, LM2, LV3)

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 P0196 Engine Oil Temperature Sensor Performance DTC P0197 Engine Oil Temperature Sensor 1 Circuit Low Voltage DTC P0198 Engine Oil Temperature Sensor 1 Circuit High Voltage DTC P0199 Engine Oil Temperature Sensor 1 Circuit Erratic Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Signal P0197 P0198 P0198 P0196 or P0199
Low Reference — P0198 — —

Circuit/System Description For an overview of the component/system, refer to: Instrument Cluster Description and Operation

Circuit Description
Signal The control module input circuit has an internal resistance connected to 5 V.
Low Reference Grounded through the control module.
Component Description
B36 Engine Oil Temperature Sensor The temperature sensor is a negative temperature coefficient thermistor, a resistor which changes based on temperature.
K20 Engine Control Module The control module converts the analog voltage signal input to a temperature value.

Conditions for Running the DTC Ignition » On / Vehicle » In Service Mode Conditions for Setting the DTC P0196 The ECM detects the actual EOT is 40°C (104°F) colder than the calculated EOT of the controller, for greater than 4 seconds or a cumulative time of 30 seconds. P0197 Engine Oil Temperature Sensor 1 Circuit = Less than 0.2 V — For greater than 10 s P0198 Engine Oil Temperature Sensor 1 Circuit = Greater than 4.8 V — For greater than 10 s P0199 Engine Oil Temperature Sensor 1 Circuit = Signal Erratic Action Taken When the DTC Sets Type C DTC Temperature Indicator = On Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type C DTC Reference Information Schematic Reference Instrument Cluster 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: Engine Oil Temperature Sensor = -39 to 120°C (-38 to 248°F) and changes ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  3. Operate the vehicle within the Conditions for Running the DTC.
  4. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC does not set
  5. All OK. Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: B36 Engine Oil Temperature Sensor
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 1 & Ground ⇒ If 10 Ω or greater 3.1. Disconnect the electrical connector: K20 Engine Control Module 3.2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 1 @ Component harness & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇓ If less than 10 Ω
  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the scan tool parameter: Engine Oil Temperature Sensor = Less than -34°C (-30°F) ⇒ If -34°C (-30°F) or warmer 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K20 Engine Control Module 5.3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & 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 -35°C (-31°F) or colder
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Low Reference circuit terminal 1
  7. Verify the scan tool parameter: Engine Oil Temperature Sensor = Greater than 143°C (290°F) ⇒ If 143°C (290°F) or colder 7.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 7.2. Disconnect the electrical connector: K20 Engine Control Module 7.3. Ignition » On / Vehicle » In Service Mode 7.4. Test for less than 1 V between the test points: Signal circuit @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 7.5. Ignition/Vehicle » Off 7.6. Test for less than 2 Ω between the test points: Signal circuit @ Component harness & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇓ If 144°C (291°F) or warmer
  8. Test or replace the component: B36 Engine Oil Temperature Sensor Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Displays and Gauges Component Replacement Reference For control module replacement, programming, and setup refer to: Control Module References