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
ยท A short to battery voltage condition exists and remains for more than 2 seconds.
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When is DTC set? |
When will DTC clear? |
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1) The ECM will not let the Malfunction Indicator Lamp (MIL) glow.
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1) A history DTC will clear after 40 consecutive warm-up cycles without showing any fault.
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2) A history DTCs is stored |
2) Take the help of scan tool to clear DTC(s).
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3) The ECM will record operating conditions at the time the diagnostic fails which will be stored as Failure Records buffers.
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3) If the ECM battery feed is detached for 10 seconds.
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4) As long as there is low voltage condition the A/C compressor operation remains thwarted. |
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SUMMARY OF THE STEPS TO BE TAKEN
DTC P1536 - Evaporator Temperature Sensor Low Voltage
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Step |
Process |
R E S |
U L T |
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1 |
Carry out an EOBD System Test
Work Done? |
IF YES
THEN
Follow Step 2 |
IF NO
THEN
Follow "On-Board Diagnostic System Check" |
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2 |
- Turn the ignition switch to LOCK.
- Remove the evaporator temperature sensor.
- 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 |
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3 |
- Turn the ignition switch to LOCK.
- 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 |
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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 |
- |
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5 |
- Once more turn the ignition switch to LOCK.
- Remove the ECM.
- 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 |
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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 |
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7 |
Change the evaporator temperature sensor.
Work Done? |
IF YES
THEN
Follow Step 9 |
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8 |
- Turn the ignition switch to LOCK.
- Replace the ECM.
Task Over? |
IF YES
THEN
Follow Step 9 |
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9 |
- Clear the DTC
- Start the engine and idle at normal operating temperature.
- 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 |
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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. |