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DTC P0536-P0538 or P153B

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0536:  Air Conditioning (A/C) Evaporator Temperature Sensor 2 Performance

DTC P0537: Air Conditioning (A/C) Evaporator Temperature Sensor 2 Circuit Low Voltage

DTC P0538:  Air Conditioning (A/C) Evaporator Temperature Sensor 2 Circuit High Voltage

DTC P153B:  Air Conditioning (A/C) Evaporator Temperature Sensor 2 Not Plausible

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Signal

P0537

P0537

P0538

P0536

Low Reference

--

P0537

--

--

Circuit Description

The A/C refrigerant low side temperature sensor measures the temperature on the low pressure side of the A/C Compressor.

The Hybrid Powertrain control module (HPCM2) supplies the A/C evaporator temperature sensor with a low reference circuit and 5-volt signal circuit. The HPCM2 determines the voltage drop across the sensor, which is proportional to temperature. As the temperature increases, the sensor resistance decreases and the voltage signal decreases. As the temperature decreases, the sensor resistance increases and the voltage signal increases.

Conditions for Running the DTC
    • DTC P153B makes comparisons between other temperature sensors to determine if the A/C refrigerant low side temperature sensor reading is close to other temperature readings after a soak period. P153B is intended to run after a long ambient soak period, such as being parked overnight, when a hot engine condition has cooled, etc.
    • DTCs P0537 and P0538 monitor A/C refrigerant low side temperature sensor for out of range conditions.
    • DTC P0536 looks for the A/C refrigerant low side temperature sensor to go down in temperature when the compressor is operated with a cold engine and after the compressor has been off for one hour.

P1536

    • 12 V battery system voltage above 10.25 V
    • Hybrid Powertrain Control Module 2 is awake and communicating.
    • None of these DTCs may be active: P0537; P0538, P0073; P0072; P0071, P0119; P0118; P0117; P0116, P0606.
    • Engine coolant temperature must be within 15 degrees of outside air temperature.
    • AC compressor must have been off for an hour since the last time the AC compressor was on.
    • AC compressor must be turned on for one minute.

P1537 or P0538

    • 12 V battery system voltage above 10.25 V
    • Hybrid Powertrain Control Module 2 is awake and communicating.

P153B

    • HPCM2 is awake and communicating.
    • None of these DTCs may be active: P0537;P0538, P0073; P0072; P0071, P0119; P0118; P0117; P0116, P0531, P0532; P0533, P0606
    • Outside air temperature raw and corrected values must have had a chance to settle out. Once this occurs these variables are assigned a status of valid. May need to have some time driving in EV mode
    • Engine coolant temperature must be within 15 degrees of outside air temperature (i.e., cool engine)
    • Outside air temperature must be between 32°F and 131°F.
    • AC compressor must have been off for an hour since the last time the AC compressor was on.

Conditions for Setting the DTC

P0536

The difference between the A/C refrigerant low side temperature sensor before compressor on and after compressor on changes less than 2 degrees over a 30 second period.

P0537

The HPCM2 detects the A/C refrigerant low side temperature sensor signal circuit is less than -38°F for more than 15 seconds.

P0538

The HPCM2 detects the A/C refrigerant low side temperature sensor signal circuit is more than 185°F for more than 4 seconds.

P153B

    • The difference between the A/C refrigerant low side temperature sensor and the outside air temperature value is greater than 10°C and
    • The difference between the A/C refrigerant low side temperature sensor and the temperature calculated from the current high Side Refrigerant Pressure Sensor reading is greater than 10 degrees.

Action Taken When the DTC Sets

These are type B DTCs.

Conditions for Clearing the DTC

These are type B DTCs.

Reference Information

Schematic Reference

HVAC Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

    •  Automatic HVAC Description and Operation
    •  Heating and Air Conditioning System Description and Operation

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 for scan tool information

Circuit/System Testing
  1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the B222 A/C refrigerant low side temperature sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal B and ground.
    3. ⇒If 10 Ω or greater
    2.1. Vehicle OFF, disconnect the harness connector at the K114B HPCM2.
    2.2. Test for less than 2 Ω in the low reference circuit end to end.
    ⇒     If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒     If less than 2 Ω, replace the K114B HPCM2.
    ⇓   If less than 10 Ω
  3. Vehicle in Service Mode.
  4. Verify the scan tool parameter A/C evaporator Temperature sensor is less than -35°F.
    5. ⇒If -35°F or greater
    4.1. Vehicle OFF, disconnect the harness connector at the K114B HPCM2.
    4.2. Test for infinite resistance between the signal circuit terminal A and ground.
    ⇒     If less than infinite resistance, repair the short to ground on the circuit.
    ⇒     If infinite resistance, replace the K114B HPCM2.
    ⇓   If less than -35°F
  5. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A.
  6. Verify the scan tool parameter A/C evaporator Temperature sensor is greater than 240°F.
    7. ⇒If 240°F or less
    6.1. Vehicle OFF, disconnect the harness connector at the K114B HPCM2, vehicle in Service Mode.
    6.2. Test for less than 1 V between the signal circuit and ground.
    ⇒     If 1 V or greater, repair the short to voltage on the circuit.
    ⇓     If less than 1 V
    6.3. Vehicle OFF
    6.4. Test for less than 2 Ω in the signal circuit end to end.
    ⇒     If 2 Ω or greater, repair the open/high resistance in the circuit.
    ⇒     If less than 2 Ω, replace the K114B HPCM2..
    ⇓   If greater than 240°F
  7. Test or replace the B222 A/C refrigerant low side temperature sensor.

Component Testing
  1. Test the A/C refrigerant low side temperature sensor by varying the sensor temperature while monitoring the sensor resistance.
  2. Compare the readings with the Sensor Resistance Table and verify that the resistance is within 5 percent of the specification.
    3. ⇒If not within the specified range, replace the sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  HVAC Component Replacement Reference
    • Control Module References for HPCM2 control module replacement, programming and setup
   


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