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Diagnostic Trouble Codes - 1990
Ford

 11  System "pass"
 12  Unable to control RPM to Self Test upper limit band.
 13  Unable to control RPM to Self Test lower limit band.
 14  PIP circuit failure.
 18  No tach.
 19  Failure of EEC power supply.
 21  ECT out of range.
 22  MAP out of range.
 23  TPS out of range.
 29  Insufficient input from Vehicle Speed Sensor.
 31  PFE circuit is below minimum.
 32  EGR valve not seated.
 33  EVP not closing properly.
 34  No EGR flow.
 35  PFE circuit is above maximum voltage.
 39  AXOD converter bypass not applying correctly.
 41  HEGO sensor circuit indicates system lean (Right HEGO).
 42  HEGO sensor circuit indicates system rich (Right HEGO).
 51  ECT sensor input too high.
 52  Power steering pressure switch is open.
 53  TPS input too high.
 54  ACT (VAT) input too high.
 57  AXOD Neutral Pressure Switch open.
 59  Transhydraulic switch (THS 3/4) failed in open position.
 61  ECT input too low.
 63  TPS input too low.
 64  ACT (VAT) input too low.
 67  AXOD Neutral Pressure Switch closed.
 68  AXOD Transmission Temperature Switch open.
 69  Transhydraulic switch (THS 3/2) failed.
 70  EEC-IV data transmission circuit failed.
 71  Cluster Control Assembly circuit failed.
 72  Message Center Control Assembly circuit failed.
 74  Brake on/off circuit failed.
 79  A/C on during Self Test.
 83  High speed Electro Drive Fan circuit failure.
 84  EGR Vacuum Regulator circuit failure.
 85  Canister purge (CANP) circuit failure.
 87  Fuel pump primary circuit fault.
 88  Electro Drive Fan circuit failure.
 89  AXOD Lock Up Solenoid circuit failure.
 91  HEGO sensor circuit indicates system lean (Left HEGO).
 92  HEGO sensor circuit indicates system Rich (Left HEGO).
 95  Fuel pump secondary circuit failure.
 96  Fuel pump secondary circuit failure.

** On 1986 and later vehicles, this represents RPM too high/low or throttle pedal was depressed during KOER Self-Test
*** Low flow of unmetered air on 1987-88 1.9L EFI engine

To extract DTCs from the computer for diagnostic purposes, the Self Test connector is used.

  1. Start engine and bring to normal operating temperature. If engine will not start or stalls after starting, proceed with next step.
  2. Turn the key "OFF", then wait ten seconds.
  3. Activate the self test by grounding the Self-Test Input (STI) connector.
  4. Turn the ignition key "ON".
  5. Record all codes received.
  6. Turn ignition "OFF".


Data Link Connector (DLC)
(Located Underhood)


Analog Voltmeter Connection

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