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    2001 Chevrolet Truck Astro Van 2WD 4.3L SFI 6cyl

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    Ford Mustang 1999-2005

    Diagnosis & Testing

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    The Anti-lock Brake System (ABS) module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. The wheel speed sensor electrically senses each tooth of the wheel speed sensor indicators as it passes through the wheel speed sensor's magnetic field.

    The ABS module continuously monitors and compares the rotational speed of each wheel, and when it detects an impending wheel lock, modulates hydraulic brake pressure to the appropriate brake caliper. This is accomplished by the ABS module triggering the Hydraulic Control Unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS module returns the solenoid valves to their normal position, and normal (base) braking resumes.

    The ABS module is self-monitoring. When the ignition switch is turned to the RUN position, the ABS module does a preliminary electrical check, and at approximately 8 mph (12 km/h) the pump motor is turned on for approximately one half-second. Any malfunction of the ABS causes the ABS to shut off and the yellow ABS warning indicator to illuminate, however, normal power assisted braking remains.

    The traction control system controls wheelspin by modulating engine torque and applying, then releasing the appropriate rear brake to restore traction when driving on slippery or loose surfaces.

    The traction control system can be disabled by pressing the traction control switch and is indicated by an indicator lamp in the traction control switch. The traction control will reset and return to normal traction assist when the ignition switch is cycled or when the traction control switch is pressed and released a second time.  

    Inspection And Verification



    1. Verify the malfunction.
    2.  
    3. Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly repair as necessary. If the stoplamps operate correctly, proceed to the next step.
    4.  
    5. Visually inspect for obvious signs of mechanical or electrical damage:
    6.  

    Mechanical



    Brake fluid level
     
    Tire inflation
     
    Wheel and tire sizes
     
    Steering components and suspension components
     
    Base brake system
     
    Wheel speed sensor
     
    Wheel speed sensor ring
     
    HCU
     

    Electrical 2005 Models



    Circuitry
     
    Brake fluid level switch
     
    Stoplamp switch
     
    Wheel speed sensor
     
    Anti-lock Brake System (ABS) module
     
    Traction control switch
     
    Bussed Electrical Center (BEC) fuse 7 (40A)
     
    Bussed Electrical Center (BEC) fuse 65 (30A)
     
    Smart Junction Box (SJB) fuse 18 (10A)
     

    Electrical 2000-04 Model Year



    Central Junction Box (CJB) fuse 5 (15A)
     
    Central Junction Box (CJB) fuse 15 (10A)
     
    Central Junction Box (CJB) fuse 29 (15A)
     
    Central Junction Box (CJB) fuse 33 (15A)
     
    Central Junction Box (CJB) fuse 35 (15A)
     
    Battery Junction Box (BJB) fuse 1 (50A)
     
    Battery Junction Box (BJB) fuse 2 (20A)
     
    Circuitry
     
    Damaged or corroded connectors
     
    ABS warning indicator
     
    Loose grounds
     

    1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC) and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
      1. check that the program card is correctly installed.
      2.  
      3. check the connections to the vehicle.
      4.  
      5. check the ignition switch position.
      6.  

    2.  
    3. If the scan tool still does not communicate with the vehicle, refer to the scan tool operating manual.
    4.  
    5. Carry out the scan tool data link test. If the scan tool responds with:
      1. System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the ABS module.
      2.  

    6.  
    7. If the DTCs retrieved are related to the concern, go to the Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index.
    8.  

    Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index

    NOTE
    If a wheel speed signal fault or a pump motor fault is detected, the yellow ABS warning indicator cannot be reset with the key OFF and key ON method. The vehicle must be driven over 8 mph (12 km/h) for the ABS module to do a re-check of the system before the yellow ABS warning indicator is turned OFF.

    DTC: Description

    B1317: Battery Voltage High

    B1318: Battery Voltage Low

    B1342: ECU Is Defective

    B1484: Brake Pedal Input Open Circuit

    B1596: Repair Continuous Codes

    B2477: Module Configuration Failure

    C1095: ABS Hydraulic Pump Motor Circuit Failure

    C1096: ABS Hydraulic Pump Motor Circuit Open

    C1115: ABS Power Relay Output Short Circuit To Battery

    C1145: RF Wheel Speed Sensor Input Circuit Failure

    C1155: LF Wheel Speed Sensor Input Circuit Failure

    C1165: RR Wheel Speed Sensor Input Circuit Failure

    C1175: LR Wheel Speed Sensor Input Circuit Failure

    C1185: ABS Power Relay Output Circuit Failure

    C1194: ABS Outlet Valve Coil LF Circuit Failure

    C1198: ABS Inlet Valve Coil LF Circuit Failure

    C1210: ABS Outlet Valve Coil RF Circuit Failure

    C1214: ABS Inlet Valve Coil RF Circuit Failure

    C1222: Wheel Speed Mismatch

    C1233: LF Wheel Speed Sensor Input Signal Missing

    C1234: RF Wheel Speed Sensor Input Signal Missing

    C1235: RR Wheel Speed Sensor Input Signal Missing

    C1236: LR Wheel Speed Sensor Input Signal Missing

    C1242: ABS Outlet Valve Coil LR Circuit Failure

    C1246: ABS Outlet Valve Coil RR Circuit Failure

    C1250: ABS Inlet Valve Coil LR Circuit Failure

    C1254: ABS Inlet Valve Coil RR Circuit Failure

    C1266: ABS Valve Power Relay Circuit Failure

    C1329: ABS Valve Outlet Coil Over RF Temperature

    C1330: ABS Valve Outlet Coil Over LR Temperature

    C1331: ABS Valve Outlet Coil Over RR Temperature

    C1332: ABS Valve Outlet Coil Over LF Temperature

    C1333: ABS Valve Inlet Coil Over RF Temperature

    C1334: ABS Valve Inlet Coil Over LR Temperature

    C1335: ABS Valve Inlet Coil Over RR Temperature

    C1336: ABS Valve Inlet Coil Over LF Temperature

    C1404: Traction Control Valve Rear Circuit Failure

    C1446: Brake Switch Circuit Failure

    C1527: ABS TC Valve Inlet Coil Over Temperature

    C1531: ABS TC Valve Outlet Coil Over Temperature

    C1730: Reference Voltage Out of Range (+5 V)

    C1805: Mismatched PCM and/or ABS module

    C1958: ABS TC Valve Outlet Coil Failure

    U0073: CAN Bus off - Transmit Error

    U1009: SCP (J1850) Invalid or Missing Data for Engine Torque

    U1027: SCP (J1850) Invalid or Missing Data for Engine RPM

    U1059: SCP (J1850) Invalid or Missing Data for Transmission/Transaxle/PRNDL

    U1083: SCP (J1850) Invalid or Missing Data for Engine Systems

    U1262: SCP (J1850) Communication Bus Fault

    U1900: CAN Communication Bus Fault - Receive Error

     
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