Pinpoint Test G: The Yellow Abs Warning Indicator Does Not Self-Check

G1 CHECK CIRCUIT 31S-CF28 (BK/RD) FOR A SHORT TO POWER 

• Key in OFF position.
• Disconnect: ABS Module C135.
• Disconnect: Instrument Cluster C220a.
• Key in ON position.
• Measure the voltage between the instrument cluster C220a pin 6, circuit 31S-CF28 (BK/RD), harness side and ground.
  Fig 1: Measuring Voltage Between Instrument Cluster C220A Pin 6, Circuit 31S-CF28 (BK/RD), Harness Side And Ground

  Courtesy of FORD MOTOR CO.
• Is any voltage present? 

Yes 

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No 

Go to G2.

G2 CHECK CIRCUIT 31S-CF28 (BK/RD) FOR AN OPEN OR A SHORT TO GROUND 

• Key in OFF position.
• Measure the resistance between the ABS module C135 pin 44, circuit 31S-CF28 (BK/RD), harness side and the instrument cluster C220a pin 6, circuit 31S-CF28 (BK/RD), harness side; and between the ABS module C135 pin 44, circuit 31S-CF28 (BK/RD), harness side and ground.
  Fig 2: Checking Circuit 31S-CF28 (BK/RD) For Open Or Short To Ground

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms between the ABS module and the instrument cluster; and greater than 10,000 ohms between the ABS module and ground? 

Yes 

Go to G3.

No 

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

G3 CHECK THE INSTRUMENT CLUSTER 

• Connect: Instrument Cluster C220a.
• Key in ON position.
• Connect a fused (10A) jumper wire between the ABS module C135 pin 44, circuit 31S-CF28 (BK/RD), harness side and ground.
  Fig 3: Checking Instrument Cluster

  Courtesy of FORD MOTOR CO.
• Does the instrument cluster ABS warning indicator turn off? 

Yes 

Install a new ABS module. REFER to HYDRAULIC CONTROL UNIT (HCU) . REPEAT the self-test. TEST the system for normal operation.

No 

INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.