Pinpoint Test K: The Anti-Lock Brake System (Abs) Warning Indicator Is Always On

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

K1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS
- Check the recorded instrument cluster DTCs from the continuous and on-demand self-test.
- Is DTC C1221 present?
1. YES : Go to K6.
2. NO : Go to K2.
K2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND ABS MODULE SELF-TESTS
- Check the recorded ABS module DTCs from the continuous and on-demand self-test.
- Are any DTCs present?
1. YES : REFER to VEHICLE DYNAMIC SYSTEMS to diagnose the ABS DTCs.
2. NO : Go to K3.
K3 CHECK THE OPERATION OF THE BRAKE WARNING INDICATOR
- Key in ON position.
- Observe the brake warning indicator.
- Is the brake warning indicator illuminated?
1. YES : Go to Pinpoint Test I to diagnosis the brake warning indicator.
2. NO : Go to K4.
K4 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL COMMAND USING THE SCAN TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command
- Select the instrument cluster indicator lamp control command. Select the ABS active command on and then off again. Observe the ABS warning indicator.
- Does the ABS warning indicator illuminate when commanded on, and turn off when commanded off?
1. YES : Go to K5.
2. NO : Go to K8.
K5 CHECK CIRCUIT CCA01 (BU/OG) FOR AN OPEN
- Key in OFF position.
- Disconnect: Instrument Cluster C220b
- Measure the resistance between the instrument cluster C220b-18, circuit CCA01 (BU/OG), harness side and the ABS module C135-17, circuit CCA01 (BU/OG), harness side.
- Is the resistance less than 5 ohms?
1. YES : Go to K6.
2. NO : REPAIR the circuit. TEST the system for normal operation.
K6 CHECK CIRCUIT CCA01 (BU/OG) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: ABS Module C135
- Disconnect: Instrument Cluster C220b
- Measure the resistance between the instrument cluster C220b-18, circuit CCA01 (BU/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
1. YES : Go to K7.
2. NO : REPAIR the circuit. TEST the system for normal operation.
K7 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect all the ABS module connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the ABS module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new ABS module. REFER to VEHICLE DYNAMIC SYSTEMS . TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
K8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new instrument cluster. REFER to Instrument Cluster (IC) . TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.