P1436 Fault Code

Audi – SECONDARY AIR INJECTION SYSTEM PUMP

For both Volkswagen and Audi, fault code P1436 is logged when the vehicle’s primary computer, the powertrain control module (PCM), has detected an issue with the secondary air injection system pump.

The code description for Volkswagen vehicles gives more insight into the cause of this problem. This code relates specifically to an electrical malfunction within the secondary air injection system pump circuit.

The secondary air injection system is used to pump ambient air into the vehicle’s exhaust system. This is done to reduce the number of unburnt hydrocarbons that are able to leave the vehicle.

These systems are particularly necessary for cold environments and starting conditions to reduce emissions.

The main purpose of these systems is to aid the reduction of emissions while the catalytic converter reaches operational temperatures. This means that these systems are found in almost every vehicle with a catalytic converter.

It is very likely that there is an issue within the pump relay circuit. This can be caused by faulty connections or damaged wiring.

See generic codes: P0410, P0411, P0418, P0419

Citroën – A/C EVAPORATOR AIR TEMPERATURE CIRCUIT LOW

For Citroen and Peugeot, fault code P1436 is logged when the powertrain control module (PCM) has detected an issue with the air conditioning evaporator air temperature circuit.

This code indicates that a low voltage in the circuit has been detected.

The evaporator is a small radiator that is essential to the air conditioning system in a vehicle. It is a heat exchanger that absorbs warmth from ambient air, cooling it to the desired temperature inside the vehicle.

By exchanging energy between the refrigerant within the evaporator and the warmer air passing over the evaporator fins, the air is cooled.

An electrical problem like this with the evaporator can cause the air conditioning system to malfunction. This is because the control module is unable to determine or control the temperature of the evaporator.

The most likely cause of this problem is a faulty evaporator temperature sensor. It is also possible that there is a fault within the sensor circuit.

Additionally, it can be caused by refrigerant levels being too low.

See generic codes: P0537

Ford – A/C EVAPORATOR AIR TEMPERATURE CIRCUIT LOW

Interestingly, fault code P1436 represents the same issue for Ford and Citroen, despite different ownership. For more information on the problem and similar generic fault codes, please see the above description for Citroen.

See generic codes: P0537

Peugeot – A/C EVAPORATOR AIR TEMPERATURE CIRCUIT LOW

For both Citroen and Peugeot, fault code P1436 represents the same issue for Ford, despite different ownership. For more information on the problem and similar generic fault codes, please see the above description for Citroen.

Volkswagen – SECONDARY AIR INJECTION SYSTEM PUMP RELAY CIRCUIT ELECTRICAL MALFUNCTION

For both Audi and Volkswagen, fault code P1436 represents the same problem. For more infomation on this issue and similar generic fault codes, please see the above description for Audi.

See generic codes: P0410, P0411, P0418, P0419