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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1721 (Vehicle Dynamic Suspension) >> Diagnostic Tests >> Vehicle Dynamic Suspension >> Pinpoint Tests >> Pinpoint Test H: The Air Compressor is Inoperative >> Pinpoint Test H: The Air Compressor Is Inoperative

Pinpoint Test H: The Air Compressor Is Inoperative

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
  1. H1 CHECK VDM DTCs 
    • Review the VDM DTCs retrieved during Inspection and Verification.
    • Is DTC C1830 present? 
    1. YES  : Go to  H7.
    2. NO  : Go to  H2.
  2. H2 CHECK THE VOLTAGE TO THE AIR SUSPENSION RELAY 
    • Disconnect: Air Compressor Relay
      • Fig 1: Measuring Voltage
      GF0047562Courtesy of FORD MOTOR CO.
    • Measure the voltage between air suspension relay cavity 30, circuit 1053 (LB/PK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  H3.
    2. NO  : VERIFY BJB fuse 112 (30A) is OK. If OK, REPAIR circuit 1053 (LB/PK). CLEAR the DTC. REPEAT the self-test.
  3. H3 CHECK CIRCUIT 538 (GY/RD) FOR AN OPEN 
    • Disconnect: Air Compressor C1179
      • Fig 2: Measuring Resistance
      GF0047563Courtesy of FORD MOTOR CO.
    • Measure the resistance between air compressor relay cavity 87, circuit 538 (GY/RD), harness side and air compressor C1179-2, circuit 538 (GY/RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H4.
    2. NO  : REPAIR circuit 538 (GY/RD). CLEAR the DTC. REPEAT the self-test.
  4. H4 CHECK CIRCUIT 538 (GY/RD) FOR A SHORT TO GROUND 
      Fig 3: Measuring Resistance
      GF0046744Courtesy of FORD MOTOR CO.
    • Measure the resistance between air compressor C1179-2, circuit 538 (GY/RD), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  H5.
    2. NO  : REPAIR circuit 538 (GY/RD). CLEAR the DTC. REPEAT the self-test.
  5. H5 CHECK THE AIR COMPRESSOR GROUND CIRCUIT FOR AN OPEN 
      Fig 4: Checking Circuit For Open
      GF0013887Courtesy of FORD MOTOR CO.
    • Measure the resistance between air compressor C1179-1, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H6.
    2. NO  : REPAIR circuit 57 (BK). REPEAT the self-test.
  6. H6 ISOLATE THE AIR COMPRESSOR 
    • Connect: Air Compressor C1179
    • Install a fused jumper wire between air compressor relay cavity 30 and cavity 87.
    • Does the air compressor run? 
    1. YES  : REMOVE the jumper wire. Go to  H7.
    2. NO  : REMOVE the jumper wire. INSTALL a new air compressor. REFER to Air Suspension Compressor . REPEAT the self-test.
  7. H7 CHECK THE AIR COMPRESSOR RELAY GROUND FOR AN OPEN 
    • Disconnect: Air Compressor Relay (if not previously disconnected)
      • Fig 5: Measuring Resistance
      GF0047564Courtesy of FORD MOTOR CO.
    • Measure the resistance between air compressor relay cavity 86, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H8.
    2. NO  : REPAIR circuit 57 (BK). CLEAR the DTC. REPEAT the self-test.
  8. H8 CHECK CIRCUIT 420 (DB/YE) FOR AN OPEN 
    • Disconnect: Air Suspension Module C2131a
      • Fig 6: Measuring Resistance
      GF0047565Courtesy of FORD MOTOR CO.
    • Measure the resistance between air suspension module C2131a-6, circuit 420 (DB/YE), harness side and air compressor relay cavity 85, circuit 420 (DB/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H9.
    2. NO  : REPAIR circuit 420 (DB/YE). CLEAR the DTC. REPEAT the self-test.
  9. H9 CHECK CIRCUIT 420 (DB/YE) FOR A SHORT TO GROUND 
      Fig 7: Checking Circuit For Short To Ground
      GF0013879Courtesy of FORD MOTOR CO.
    • Measure the resistance between air suspension module C2131a-6, circuit 420 (DB/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  H10.
    2. NO  : REPAIR circuit 420 (DB/YE). CLEAR the DTC. REPEAT the self-test.
  10. H10 ISOLATE THE AIR COMPRESSOR RELAY 
    • Carry out the mini-ISO relay component test. Refer to appropriate COMPONENT TESTING article.
    • Does the air compressor relay pass the test? 
    1. YES  : INSTALL a new air suspension module. REFER to Vehicle Dynamics Module (VDM) . REPEAT the self-test.
    2. NO  : INSTALL a new air compressor relay. CLEAR the DTC. REPEAT the self-test.
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