The supply module (SM) is a part of the vehicle SCR system. The SM is a hydraulic unit which sucks the reducing agent (DEF/AdBlue) from the tank, pressurizes it ( approx. 8-10 bars) and delivers it to the dosing module which is fixed to the exhaust line. The SM is controlled via the engine ECU.
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ECU connection
The pin numbers at the ECU:
1.23 Pressure sensor 5V reference supply
1.32 Pressure sensor analog signal input
1.31 Pressure sensor ground
1.22 Pump motor ground
1.08 Pump motor supply
1.02 Pump motor PWM
1.05 Reverting valve (HS)
1.04 Reverting valve signal (LS)
1.18 Heater signal ground
Heater supply controlled by DEF heater relay
1.06 DEF heater relay high side coil
1.03 DEF heater relay low side coil
The supply module connector pinout is shown in figure ECU connection, Supply module connector.
Characteristics
Common information:
Supply module normal pressure = 8-10 bars, offset 1 bar.
Supply module pressure build up time = approx 2-4 minutes.
Supply module emptying time = approx 2 minutes.
The supply module picture is shown in figure Supply module.
The supply module hose connectors are shown in figure Supply module hose connectors.
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