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abs problems

Discussion in 'Ford Trucks' started by wendell, Mar 6, 2010.

  1. wendell

    wendell Junior Member
    Messages: 1

    2001 f-150
    abs light on at start-up and stays on, code 1206 (inlet valve coil rear circuit failure) and code 1230 (speed wheel sensor rear center input circuit failure), i have changed the rear sensor twice (got them from work free) no change. code 1206 i don't know what it really mean. can any one help?
     
  2. mrv8outboard

    mrv8outboard Senior Member
    Messages: 197

    C1206 / C1208 Isolation Valve , Rear

    1st Carry out ABS Control Module On-Demand Self-Test.

    Is a single valve DTC set?
    YES
    INSTALL a new anti-lock brake control module (2B373). REFER to Anti-Lock Brake System (ABS) Module in this section. REPEAT the self-test.

    NO
    If multiple valve DTCs are set, GO to D2 .

    If no DTCs are set, CLEAR the DTCs. DRIVE the vehicle over rough roads and through a car wash. REPEAT the self-test.

    D2 CHECK EHCU POWER CIRCUIT 532 (OG/YE)
    Measure the voltage between EHCU C146 Pins 9 and 25, circuit 532 (OG/YE), harness side and ground.

    Is the voltage greater than 10 volts?

    YES
    INSTALL a new anti-lock brake control module. REFER to Anti-Lock Brake System (ABS) Module in this section. REPEAT the self-test.

    NO
    REPAIR the circuit. CLEAR the DTCs. DRIVE the vehicle over rough roads and through a car wash. REPEAT the self-test.

    C1230 Rear Anti-Lock Brake Sensor (Electrical/Static)

    Drive the vehicle at least 16 km/h (10 mph).
    Retrieve and document continuous DTCs.

    Is DTC C1230 retrieved?

    YES
    GO to I2 .

    I2 CHECK ANTI-LOCK BRAKE SENSOR COIL RESISTANCE AT EHCU CONNECTOR

    Connect EEC-IV 60-Pin Breakout Box.

    Measure the resistance between EEC-IV 60-Pin Breakout Box pin 14, circuit 523 (RD/PK) and pin 6, circuit 519 (LG/BK).

    Is the resistance between 800 and 3500 ohms?

    YES
    GO to I4

    NO
    If the resistance is below 800 ohms, INSTALL a new rear anti-lock brake sensor. REFER to Sensor—Rear in this section. CLEAR the DTCs. DRIVE the vehicle over rough roads and through a car wash. REPEAT the self-test.

    If the resistance is greater than 3500 ohms, GO to I3 .

    I3 DETERMINE LOCATION OF FAULT

    Measure the resistance between the rear anti-lock brake sensor pin 1 and pin 2.

    Is the resistance greater than 2500 ohms?

    YES
    REPLACE the rear anti-lock brake sensor. REFER to Sensor—Rear in this section.

    NO
    REPAIR circuit 519 (LG/BK) and circuit 523 (RD/PK).

    I4 CHECK REAR ANTI-LOCK BRAKE SENSOR CIRCUIT FOR SHORT TO GROUND

    Measure the resistance between EEC-IV 60-Pin Breakout Box pin 14, circuit 523 (RD/PK) and ground, and between EEC-IV 60-Pin Breakout Box pin 6, circuit 519 (LG/BK) and ground.

    Are the resistances greater than 10,000 ohms?

    YES
    GO to I6 .

    NO
    GO to I5 .


    I5 CHECK FOR ANTI-LOCK BRAKE SENSOR SHORT

    Measure the resistance between rear anti-lock brake sensor pin 1 and ground; and between rear anti-lock brake sensor pin 2 and ground.

    Are the resistances greater than 10,000 ohms?

    YES
    REPAIR circuit 519 (LG/BK) and circuit 523 (RD/PK). CLEAR the DTCs. DRIVE the vehicle over rough roads and through a car wash. REPEAT the self-test.

    NO
    INSTALL a new rear anti-lock brake sensor; REFER to Sensor—Rear in this section. CLEAR the DTCs. DRIVE the vehicle over rough roads and through a car wash. REPEAT the self-test.

    I6 TEST FOR INTERMITTENT ANTI-LOCK BRAKE SENSOR FAULT

    Carry out the Sensor Failure test for the rear anti-lock brake sensor. REFER to Component Test — Intermittent Failures.


    Did the rear anti-lock brake sensor pass?

    Yes
    RECONNECT the rear anti-lock brake sensor C414. CLEAR the DTCs. DRIVE the vehicle over rough roads and through a car wash. REPEAT the self-test.

    No
    REPAIR as necessary. CLEAR the DTCs. DRIVE the vehicle over rough roads and through a car wash. REPEAT the self-test.

    Component Test — Intermittent Failures

    1 Sensor

    Disconnect the suspect anti-lock brake sensor

    NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

    Monitor the resistance between pins and ground as follows

    Rear anti-lock brake sensor 523 (RD/PK) and 519 (LG/BK)

    Drive over rough roads at various speeds.
    If there is continuity between either circuit and ground, repair the circuit for a short to ground.

    2 Check harness for open circuit.
    NOTE: Connect jumper securely to the suspect sensor connector.

    Connect a jumper between the two pins on the suspect sensor connector.
    NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.

    Monitor the resistance between pins as follows:
    Rear anti-lock brake sensor 523 (RD/PK) and 519 (LG/BK)

    Drive over rough roads at various speeds.
    If there is open circuit detected between pins, repair the circuit(s) for an open circuit.

    3 Check suspect sensor electrical connector.
    NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.

    Monitor the resistance between suspect anti-lock brake sensor terminals while wiggling the electrical connector:

    Rear
    4x2 or 4x4 3500 ohms

    If the resistance is above specifications, install a new anti-lock brake sensor.
    NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

    Monitor the resistance between suspect anti-lock brake sensor pins (component side) while wiggling the electrical connector:

    Rear
    4x2 or 4x4 800 ohms

    If the resistance is below specifications, install a new anti-lock brake sensor.
    NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

    Monitor the resistance between an anti-lock brake sensor pin (component side) and ground on the highest resistance scale of the meter, while wiggling the electrical connector.
    If the meter shows anything but open circuit, install a new anti-lock brake sensor.


    Hope this helps. Let us know how you make out.