DIAGNOSTIC TROUBLE CODE (DTC) - P1536 EVAPORATOR TEMPERATURE SENSOR LOW VOLTAGE

Know Your Circuit

  • This circuit utilizes a semiconductor whose resistance is noticeably changed with fluctuating temperature.
  • Frost or ice chokes the evaporator cores thereby reducing the airflow and the cooling capacity when the refrigerant temperature of the evaporator dips to 0C (0F) and below.
  • The sensor thermistor is used to counter frosting or icing.
  • This thermistor is installed on the evaporator.

 

Pre -requisites For Setting The DTC

·   A short to battery voltage condition exists and remains for more than 2 seconds.

When is DTC set?

When will DTC clear?

1) The ECM will not let the Malfunction Indicator Lamp (MIL) glow. 

 

1) A history DTC will clear after 40 consecutive warm-up cycles without showing any fault.

 

2) A history DTCs is stored

2) Take the help of scan tool to clear DTC(s).

 

3) The ECM will record operating conditions at the time the diagnostic fails which will be stored as  Failure Records buffers.

 

3) If the ECM battery feed is detached for 10 seconds.

 

4) As long as there is low voltage condition the A/C compressor operation remains thwarted.

-

                SUMMARY OF THE STEPS TO BE TAKEN

DTC P1536 - Evaporator Temperature Sensor Low Voltage

 

 

Step

Process

R   E    S     

   U    L    T

1

Carry out an EOBD System Test

Work Done?

IF YES

 THEN

 

 

 

Follow Step 2

IF NO

 THEN

 

Follow "On-Board Diagnostic System Check"

2

  1. Turn the ignition switch to LOCK.
  2. Remove the evaporator temperature sensor.
  3. Check what the resistance is between evaporator temperature sensor terminals 1 and 2.

Note: the value here is 0 Ohms.

Does the resistance within the specified value?

IF YES

 THEN

Follow Step 7

IF NO

 THEN

Follow Step 3

3

  1. Turn the ignition switch to LOCK.
  2.  Test the ignition feed circuit, at terminal 2 in the sensor harness connector with the test light connected to ground.

Does the test light glow?

IF YES

 THEN

 

Follow Step 4

IF NO

 THEN

 

Follow Step 5

4

Repair a short to battery between the terminal 46 of ECM and A/C compressor relay terminal 2.

Work Done?

IF YES

 THEN

 

Follow Step 9

-

5

  1. Once more turn the ignition switch to LOCK.
  2. Remove the ECM.
  3. Test the ignition feed circuit, at terminal 2 in the sensor harness connector with the test light connected to ground.

Does the test light glow?

IF YES

 THEN

 

Follow Step 6

IF NO

 THEN

 

Follow Step 8

6

Mend a short to battery between the ECM wiring connector terminal 46 and evaporator temperature sensor terminal 2.

 

Work Done?

IF YES

 THEN

Follow Step 9

-

7

Change the evaporator temperature sensor.

 

Work Done?

IF YES

 THEN

Follow Step 9

-

8

  1. Turn the ignition switch to LOCK.
  2. Replace the ECM.

Task  Over?

IF YES

 THEN

Follow Step 9

-

9

  1. Clear the DTC
  2. Start the engine and idle at normal operating temperature.
  3. Run the vehicle within the conditions for setting this DTC as mentioned in the supporting text.

Does the scan tool indicate that this diagnostic was run and passed?

IF YES

THEN

 

 

Follow Step 10

IF NO

 THEN

 

 

Follow Step 2

10

Check if any additional DTCs are set.

Do you see any undiagnosed DTC set?

Follow applicable DTC table

The System of your car is Fine.