Pinpoint Test A: No Communication With The Air Suspension Module

WARNING: This page is about a different car, the 2005 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK CIRCUIT 298 (VT/OG) FOR AN OPEN
- Key in OFF position.
- Disconnect: Air Suspension Module C2131a.
- Key in ON position.
- Measure the voltage between the air suspension module C2131a pin 16, circuit 298 (VT/OG), harness side and ground.
  
  Fig 1: Measuring Voltage Between Air Suspension Module C2131a Pin 16, Circuit 298 (VT/OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to A2.
- No : REPAIR the circuit. REPEAT the self-test.
A2 CHECK CIRCUIT 418 (DG/YE) FOR AN OPEN
- Measure the voltage between the air suspension module C2131a pin 15, circuit 418 (DG/YE), harness side and ground and between the air suspension module C2131a pin 1, circuit 418 (DG/YE), harness side and ground.
  
  Fig 2: Measuring Voltage Between Air Suspension Module C2131a Pin 15, Circuit 418 (DG/YE), Harness Side And Ground And Between Air Suspension Module C2131a Pin 1, Circuit 418 (DG/YE), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to A3.
- No : REPAIR the circuit. REPEAT the self-test.
A3 CHECK CIRCUIT 676 (PK/OG) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the air suspension module C2131a pin 6, circuit 676 (PK/OG), harness side and ground.
  
  Fig 3: Measuring Resistance Between Air Suspension Module C2131a Pin 6, Circuit 676 (PK/OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : Refer to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communication network.
- No : REPAIR the circuit. REPEAT the self-test.