Pinpoint Test A: No Communication With The Front Electronic Module (Fem)

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe Adaptor(s) may damage the connector.

A1 CHECK CIRCUITS 29-DK20 (OG/GN) AND 29S-DK221 (OG/WH) FOR VOLTAGE
- Key in OFF position.
- Disconnect: FEM C201a.
- Disconnect: FEM C201c.
- Key in ON position.
- Measure the voltage between the FEM C201a-1, circuit 29S-DK22 (OG/WH), harness side and ground; and between FEM C201c-6, circuit 29-DK20 (OG/GN), harness side and ground.
  
  Fig 1: Checking Circuits 29-DK20 (OG/GN) And 29S-DK221 (OG/WH) For Voltage
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
Yes : GO to A2 .

No : VERIFY the CJB fuses 20 (10A) and 30 (5A) are OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

A2 CHECK THE FEM GROUND CIRCUITS FOR AN OPEN

Key in OFF position.

Using the following table, measure the resistance between the FEM connector, harness side and ground:

CONNECTOR-PIN REFERENCE

Connector-Pin	Circuit
C201a-11	31-DK20A (BK/RD)
C201a-13	31-DK20B (BK/RD)
C201a-14	31-DK20C (BK/RD)
C201a-15	31-DK20D (BK/RD)
C201c-12	31-DK20 (BK/RD)

Fig 2: Checking FEM Ground Circuits For Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes : REFER to MODULE COMMUNICATIONS NETWORK to diagnose the communication network.

No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.