Pinpoint Test D: The Powertrain Control Module (Pcm) Does Not Respond To The Diagnostic Tool

D1 CHECK PCM C175 FOR DAMAGE
- Key in OFF position.
- Disconnect: PCM C175.
- Is the PCM C175 OK?
- Yes : GO to D2.
- No : REPAIR PCM C175. CARRY OUT the diagnostic tool data link test.
D2 CHECK HIGH SPEED CAN CIRCUITS 1847 (WH/OG) AND 1848 (PK/OG) BETWEEN DLC C251 AND PCM C175 FOR OPEN
- Key in OFF position.
- Measure the resistance between the PCM C175 pin 15, circuit 1847 (WH/OG), harness side and the DLC C251 pin 6, circuit 1847 (WH/OG), harness side.
  
  Fig 1: Measuring Resistance Between PCM C175 Pin 15, Circuit 1847 (WH/OG), Harness Side And DLC C251 Pin 6, Circuit 1847 (WH/OG), Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM C175 pin 16, circuit 1848 (PK/OG), harness side and the DLC C251 pin 14, circuit 1848 (PK/OG), harness side.
  
  Fig 2: Measuring Resistance Between PCM C175 Pin 16, Circuit 1848 (PK/OG), Harness Side And DLC C251 Pin 14, Circuit 1848 (PK/OG), Harness Side
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to D3.
- No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
D3 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the PCM module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.