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Pinpoint Test A: No Communication With The Generic Electronic Module (Gem)

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. A1 CHECK THE GEM CIRCUITS FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: GEM C201c
    • Key in ON position.
      • Fig 1: Measuring Voltage
      GF0040687Courtesy of FORD MOTOR CO.
    • Measure the voltage between the GEM C201c-5, circuit 29-DK20 (OG/GN), harness side and ground; and between the GEM C201c-1, circuit 29-AA17 (OG/WH), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  A2.
    2. NO  : VERIFY the CJB fuse(s) 32 (15A) and 63 (20A) are OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
  2. A2 CHECK THE GEM GROUND CIRCUIT 31-DK20 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: GEM C201a
      • Fig 2: Measuring Resistance
      GF0040688Courtesy of FORD MOTOR CO.
    • Measure the resistance between the GEM C201a-5, circuit 31-DK20 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
  3. A3 CHECK THE GEM GROUND CIRCUIT 91-DK20 (BK/RD) FOR AN OPEN 
    • Disconnect: GEM C201d
      • Fig 3: Measuring Resistance
      GF0040689Courtesy of FORD MOTOR CO.
    • Measure the resistance between the GEM C201d-1, circuit 91-DK20 (BK/RD), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : REFER to MODULE COMMUNICATIONS NETWORK article to continue communication diagnosis.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
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