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Circuit/System Testing

NOTE:

It is recommended that Component Testing is performed before Circuit/System Testing when diagnosing the variable power steering solenoid valve.

  1. Ignition OFF, disconnect the harness connector at the M72 Variable Power Steering Solenoid Valve.
  2. Ignition ON, test for less than 0.3 V between the control terminals listed below and ground.
    • M72 Variable Power Steering Solenoid Valve, terminal A
    • M72 Variable Power Steering Solenoid Valve, terminal B
    • If greater than the specified value, test the control circuits for a short to voltage. If the circuits test normal, replace the K17 Electronic Brake Control Module.
  3. Ignition OFF, disconnect the negative terminal of the C1 Battery.
  4. Test for infinite resistance between the control circuit terminals listed below and B+.
    • M72 Variable Power Steering Solenoid Valve, terminal A
    • M72 Variable Power Steering Solenoid Valve, terminal B
    • If not within the specified range, test the control circuit for a short to ground. If the circuits test normal, replace the K17 Electronic Brake Control Module.
  5. Disconnect the harness connector at the K17 Electronic Brake Control Module. Test for less than 5 Ω between the control circuit terminals listed below:
    • M72 Variable Power Steering Solenoid Valve, terminal A and K17 Electronic Brake Control Module, terminal 3
    • M72 Variable Power Steering Solenoid Valve, terminal B and K17 Electronic Brake Control Module, terminal 31
    • If greater than the specified value, test the control circuit for an open/high resistance.
  6. If all circuits test normal, test or replace the K17 Electronic Brake Control Module.
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