Pinpoint Test A: The Anti-Lock Brake System (Abs) Control Module Does Not Respond To The Diagnostic Tool

Test Step 

A1 CHECK THE ABS CONTROL MODULE C135 FOR DAMAGE 

• Key in OFF position.
• Disconnect: ABS Control Module C135.
• Inspect the ABS control module C135 for damage.
• Is the ABS control module C135 OK? 

Result / Action to Take 

Yes 

GO to A2.

No 

REPAIR the ABS control module C135 as necessary. CARRY OUT the diagnostic tool data link test.

Test Step 

A2 CHECK CIRCUIT 914 (TN/OG) AND 915 (PK/LB) FOR AN OPEN BETWEEN THE DLC C251 AND THE ABS CONTROL MODULE C135 

• Measure the resistance between the ABS control module C135 pin 30, circuit 914 (TN/OG), harness side and the DLC C251 pin 2, circuit 914 (TN/OG), harness side.
  Fig 1: Checking Circuit 914 (TN/OG) For An Open Between DLC C251 And ABS Control Module C135

  Courtesy of FORD MOTOR CO.
• Measure the resistance between the ABS control module C135 pin 29, circuit 915 (PK/LB), harness side and the DLC C251 pin 10, circuit 915 (PK/LB), harness side.
  Fig 2: Checking Circuit 915 (PK/LB) For An Open Between DLC C251 And ABS Control Module C135

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

Result / Action to Take 

Yes 

GO to A3.

No 

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

Test Step 

A3 CHECK FOR CORRECT ABS CONTROL MODULE OPERATION 

• Disconnect all the ABS control module connectors.
• Check for:
  • corrosion
  • pushed-out pins
• Connect all the ABS control module 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 ABS control module. REFER to ANTI-LOCK CONTROL-TRACTION CONTROL . 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 selftest.