![]() So that, when the fan controller switches the low-speed output, the fans run at low speed. The speed controller is powered from the fan control modules low speed output. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Component Tests (VAG Code Tests)/Test Box, Connecting For Wiring TestĮngine Control Module (ECM) is not connected. This solution works by driving the fans high speed wire with a pulse width modulated supply from a PWM speed controller. ![]() If there is no malfunction in voltage supply:Ĭheck wire to Engine Control Module (ECM) according to wiring diagram.Ĭhecking wire to Engine Control Module (ECM)Ĭonnect test box to 94-pin connector of wiring harness, connecting test box for wiring test. If there is a malfunction in voltage supply:Ĭheck wires between 4-pin connector (terminals 1 and 2) and corresponding fuse holder for open circuit according to wiring diagram.Ĭheck for open circuit in wire between 4-pin connector terminal 4 and Ground (GND) according to wiring diagram.Įrase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Connect multimeter for voltage measurement with adapter cables to Terminals 1 and 4 Terminals 2 and 4 of connector
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