Where is the reductant heater and sender Assembly located?
The reductant heater and sender assembly heating element is located directly above the pickup tube inlet filter. When the reductant heater and sender assembly temperature sensor detects the reductant temperature dropping to its freezing point, the reductant heater and sender assembly heating element thaws and maintains a pool…
When does the PCM turn on the Def heater?
It also determines when the heaters are turned on for both the tank and for the supply line. In either heater’s case, as the temperature of the DEF falls below the 32 degree mark, the PCM will have the control module operate the various DEF system heaters.
Where is the p20ba code located on a reductant heater?
These heaters are typically located in the DEF reservoir and/or the reductant injector supply hose/s. If the PCM detects improper voltage that is outside the normal expected value range within the control circuit for reductant heater A, a code P20BA will be stored and a malfunction indicator lamp may be illuminated.
What is the reductant heater control system used for?
The reductant heater control system is used by the Powertrain Control Module (PCM) to heat up the Diesel Exhaust Fluid (DEF) to prevent it from freezing.
What to do if your heater sender does not work?
If your sender reads the temperature after the thermostat opens, then it might not function properly. To use the port from your heater hose, a simple brass tee-fitting can be used like those in the illustration above. This allows for the hose connection still, as well as an additional port for the new sender.
What kind of sender does a cooling fan need?
A cooling fan, however, requires a different type of temperature sender, much like the one in our Fan Relay Kits. That sender contains a switch, rather than a variable resistor, and is either on or off. A cold engine will provide an open circuit, and no current can flow from the sender to the fan relay.
Can a fan switch be used with an EFI controller?
One advantage to the EFI conversion kits is that there is a dedicated output to use for electric fan relays, and the EFI controller can be used to switch the fans on at a set temperature, and off again when the temperature drops below a certain point.
When to shut off O2 sensor heater circuit?
Some computer systems will shut the O 2 heater circuit off until the codes are cleared. Now, with the ignition switch off, plug the test harness with the light into the vehicle’s O 2 sensor harness connection. The light should remain off until the engine is started. Once the engine is running, the light should come on steady or blink.