Test Procedure

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

J1 - CARRY OUT THE RECALIBRATION PROCEDURE
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Clear DTCs.
- Carry out the brake booster recalibration procedure using the diagnostic tool.
- Enter the following diagnostic mode on the diagnostic tool: Retrieve DTCs.
- Are any DTCs retrieved or does the recalibration procedure indicate a fault?
  1. Yes : If DTC C1287 is retrieved or recalibration procedure indicates a fault, Go to J2.
    If any other DTC, go to ANTI-LOCK BRAKE SYSTEM (ABS)/TRACTION CONTROL AND ABS/TRACTION CONTROL WITH ADVANCE TRAC®/IVD DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
  2. No : The system is operating correctly.

J2 - CHECK THE NORMALLY CLOSED RELEASE SWITCH
- Key in OFF position.
- Disconnect: Brake Booster C149.
- Measure the resistance between brake booster 149-2 (component side) and brake booster C149-5 (component side), while applying and releasing the brake pedal.
  
  Fig 1: Measuring Resistance Between Brake Booster 149-2 And Brake Booster C149-5
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms with the brake pedal released and greater than 10,000 ohms with the brake pedal applied?
  1. Yes : GO to J3.
  2. No : INSTALL a new brake booster. REFER to BRAKE SYSTEM article. CLEAR the DTC. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure REFER to MODULE COMMUNICATIONS NETWORK . REPEAT the self-test.

J3 - CHECK THE NORMALLY OPEN RELEASE SWITCH
- Measure the resistance between brake booster C149-1 (component side) and brake booster C149-5 (component side), while applying and releasing the brake pedal.
  
  Fig 2: Measuring Resistance Between Brake Booster C149-1 And Brake Booster C149-5
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms with the brake pedal applied and greater than 10,000 ohms with the brake pedal released?
  1. Yes : GO to J4.
  2. No : INSTALL a new brake booster. REFER to BRAKE SYSTEM article. CLEAR the DTC. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REFER to MODULE COMMUNICATIONS NETWORK . REPEAT the self-test.

J4 - CHECK THE BRAKE BOOSTER CIRCUITRY FOR A SHORT TO POWER

Disconnect ABS Module C135
Key in ON position.

Measure the voltage between brake booster C149 pins, harness side, and ground, as follows:

BRAKE BOOSTER C149 PINS CHART

Active Brake Booster C149	Circuit
1	8-CF51 (WH/GN)
2	10-CF51 (GY/OG)
5	9-CF51 (BN/RD)

Fig 3: Measuring Voltage Between Brake Booster C149 Pins Harness Side And Ground

Courtesy of FORD MOTOR CO.

Is voltage present?

Yes : REPAIR the circuit in question. CLEAR the DTC. RECALIBRATE the ABS module. REPEAT the self-test.
No : GO to J5.

J5 - CHECK THE BRAKE BOOSTER CIRCUITRY FOR A SHORT TO GROUND

Measure the resistance between the brake booster C149 pins and ground as follows:

BRAKE BOOSTER C149 PINS CHART

Brake Booster Pin	Circuit
1	8-CF51 (WH/GN)
2	10-CF51 (GY/OG)
5	9-CF51 (BN/GN)

Fig 4: Measuring Resistance Between Brake Booster C149 Pins And Ground

Courtesy of FORD MOTOR CO.

Is the resistance greater than 10,000 ohms?
1. Yes : GO to J6.
2. No : REPAIR the circuit in question. CLEAR the DTC(s). REPEAT the self-test.

J6 - CHECK THE BRAKE BOOSTER CIRCUITRY FOR AN OPEN

Key in OFF position.

Measure the resistance between ABS module C135 pins, harness side, and brake booster C149 pins, harness side, as follows:

ABS MODULE C135 PINS AND BRAKE BOOSTER C149 PINS CHART

ABS Module C135 Pin	Brake Booster C149 Pin	Circuit
27	1	8-CF51 (WH/GN)
28	5	9-CF51 (BN/GN)
30	2	10-CF51 (GY/OG)

Fig 5: Measuring Resistance Between ABS Module C135 Pins And Brake Booster C149 Pins Harness Side

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?
1. Yes : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this section. REPEAT the self-test.
2. No : REPAIR the circuit in question. CLEAR the DTC. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REFER to MODULE COMMUNICATIONS NETWORK . REPEAT the self-test.