2008 Mazda B Series 4wd-cab-plus OBD2 Code B1947 Climate Control A/C Post Evaporator Sensor Circuit Short To Ground

B1947 code definition

The B1947 code is a manufacturer-specific body code related to the climate control system. In this case, the engine control module (ECM) has detected a fault in the evaporator sensor for the climate control system or A/C .

What the B1947 code means

A code B1947 will be stored when the ECM detects a voltage signal from the post evaporator sensor that is signaling a short, or a signal other than approximately 5 volts (depending on 2008 Mazda B Series 4wd-cab-plus make and model).

What causes the B1947 code?

Several problems may cause a B1947 code including:

• Malfunctioning, damaged, or defective evaporator temperature sensor
• Damaged or defective climate control unit
• Open or short circuit in wiring harness between climate control unit and evaporator temperature sensor

What are the symptoms of the B1947 code?

Symptoms of a B1947 code may include: * Check engine or warning light may illuminate * Climate control or A/C may not work correctly * There may be no symptoms other than a stored B1947 code

How does a mechanic diagnose the B1947 code?

A mechanic may use several methods to diagnose a B1947 trouble code, including:

• Utilize an OBD-II scanner to check for a stored B1947 trouble code
• Visually inspect wiring and electrical components related to the evaporator temperature sensor for signs of damage
• Inspect the evaporator temperature sensor
• Disconnect climate control unit and evaporator temperature sensor connector and check for an open circuit in the wiring harness between the T-B and U-A terminals of the climate control unit and evaporator temperature sensor
• Turn the ignition to the “on” position and using an ohmmeter to inspect voltage at Terminal T of the climate control unit terminal
• Check if voltage is approximately 5 volts (may vary slightly depending on 2008 Mazda B Series 4wd-cab-plus make and model, it is recommended to always consult your 2008 Mazda B Series 4wd-cab-plus's service manual)

How serious is the B1947 code?

Because a 2008 Mazda B Series 4wd-cab-plus's safe driving operation most likely will not be impacted due to faults that store a B1947 code, this code is not considered to be a serious code. When this code appears, it is recommended to take your 2008 Mazda B Series 4wd-cab-plus to your local service center or mechanic for repair and diagnosis as soon as possible.

What repairs can fix the B1947 code?

Several repairs can fix a B1947 trouble code and include:

• Repair or replace damaged or shorted electrical wiring and related components
• Replace the damaged or defective evaporator temperature sensor
• Repair any damaged or defective wiring harness between the T-B or U-A terminals
• Replace damaged or defective climate control unit
• Clear all codes, test-drive your 2008 Mazda B Series 4wd-cab-plus, and rescan to see if any codes reappear

Additional information related to a B1947 code

It is always recommended to take all proper safety precautions when working with the electrical components of your 2008 Mazda B Series 4wd-cab-plus and to carefully follow service instructions. With more complicated electrical repairs, it is recommended to seek assistance from a professional.

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