Coolant FC (Fan Control) Control Module 1, Checking

Coolant FC (Fan Control) Control Module 1, Checking

Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

Test requirements







- Fuses in E-box (plenum chamber, left) must be OK
- Motronic Engine Control Module (ECM) Power Supply Relay -J271- -position A3- must be OK, check
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as, lights and rear window defroster must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- For vehicles with automatic transmission, selector lever must be in -P-.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.

Test sequence







- Disconnect 4-pin connector from Coolant Fan Control (FC) Control Module -J293- -1-.


Checking voltage supply







- Connect multimeter to terminals 1+4 and 2+4 of connector for voltage measurement.
- Switch ignition on.
Specified value: at least 10.0 V
- Switch ignition off.

If there is no voltage:
- Check wires between 4-pin connector (terminals 1 and 2) and Motronic Engine Control Module (ECM) Power Supply Relay -J271- for open circuit according to wiring diagram.

Wire resistance: max. 1.5 ohm

- Check for open circuit in wire between 4-pin connector terminal 4 and Ground (GND) according to wiring diagram.

Wire resistance: max. 1.5 ohm

- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code

If there is no malfunction in voltage supply:
- Check wire to Engine Control Module (ECM) according to wiring diagram.

Checking wire to Engine Control Module (ECM)

- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- Check wire between test box and 4-pin connector for open circuit according to wiring diagram.
Terminal 3 + socket 66

Wire resistance: max. 1.5 ohm

- Check wire for short circuit to vehicle Ground (GND) and to B+.

Specified value: infinity ohm

- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code

If no malfunction is detected in wire and there was voltage present between terminals 1+4 and 2+4:
- Replace Coolant Fan Control (FC) Control Module -J293- with Coolant Fan -V7-.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code