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

Test Step 

J1 CHECK THE PCM C175 FOR DAMAGE 

• Key in OFF position.
• Disconnect: PCM C175.
• Inspect the PCM C175 for damage.
• Is the PCM C175 OK? 

Result / Action to Take 

Yes 

GO to J2.

No 

REPAIR the PCM C175 as necessary. CARRY OUT the diagnostic tool data link test.

Test Step 

J2 CHECK CIRCUITS 914 (TN/OG) AND 915 (PK/LB) FOR AN OPEN BETWEEN THE DLC C251 AND THE PCM C175 

• Measure the resistance between the PCM C175 pin 16 circuit 914 (TN/OG), harness side and the C251 pin 2, circuit 914 (TN/OG), harness side.
  Fig 1: Checking Circuit 914 (TN/OG) For An Open Between DLC C251 And PCM C175

  Courtesy of FORD MOTOR CO.
• Measure the resistance between the PCM C175 pin 15, circuit 915 (PK/LB), harness side and the C251 pin 10, circuit 915 (PK/LB), harness side.
  Fig 2: Checking Circuit 915 (PK/LB) For An Open Between DLC C251 And PCM C175

  Courtesy of FORD MOTOR CO.
• Are the resistances less than 5 ohms? 

Result / Action to Take 

Yes 

GO to J3.

No 

REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.

Test Step 

J3 CHECK FOR CORRECT PCM OPERATION 

• Disconnect all PCM connectors.
• Check for:
  • corrosion
  • pushed-out pins
• Connect all PCM connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present? 

Result / Action to Take 

Yes 

INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . 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.