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Ford ES — VR21 REPLACEMENT

For the Ford ES.

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Before you start

  • NOTE: FIELD
  • NOTE: T h e 2500ohm external voltage a d j u s t potentio-

Procedure

  1. Stop engine.
  2. Disconnect and if necessary, label the following
  3. Remove four screws at corners.
  4. Remove used PC board.
  5. Install new PC board; secure with four screws.
  6. Reconnect wires removed in step 2 at the proper
  7. Place jumper W10 at proper terminals for your
  8. Perform Voltage Calibration and Stability Ad-
  9. 1 / 2 1
  10. 1/21

Specs & torque values

  • NOTE: T h e 2500ohm external voltage a d j u s t potentio-

Source: manual:0900-0335_Service Manual Ford Engine Detector I1_198207.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.