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 Diagnostic Trouble Codes - 1986 FORD
 

 

 Complements,
 

 

 

 

11  System "pass"
 12  RPM out of spec (extended idle)
 13  RPM out of spec (normal idle)
 14  PIP was erratic (continuous test)
 15  ROM test failed
 16  RPM too low (fuel lean test) **
 17  RPM too low (upstream/lean test) **
 18  No tach
 19  No power to processor or idle speed incorrect
 21  ECT out of range
 22  MAP out of range
 23  TPS out of range
 24  ACT out of range
 25  Knock not sensed in test
 26  MAF (VAF) out of range
 28  Ambient temp. below 50° F (1.9L EFI & 2.3L Turbo only)
 31  EVP out of limits
 32  EGR not controlling
 33  EVP not closing properly
 34  No EGR flow
 35  RPM too low (EGR test)
 36  Fuel always lean (at idle)
 37  Fuel always rich (at idle)
 41  System always lean
 42  System always rich
 43  EGO cool down occurred
 44  Air management system inoperative
 45  Air always upstream
 46  Air not always bypassed
 47  Up air/lean test always rich***
 48  Injectors unbalanced
 51  ECT input too high
 52  Power steering pressure switch is open or steering wheel not turned during KOER self-test
 53  TPS input too high
 54  ACT (VAT) input too high
 55  Electrical charging under voltage
 56  MAF (VAF) input too high
 58  Idle tracking switch input too high (engine running test)
 59  Trans. hydraulic switch (THS 3/4) failed in open position (3.0L & 3.8L A/T only
 61  ECT input too low
 62  Trans. hydraulic switch (THS 3/4) failed
 63  TPS input too low
 64  ACT (VAT) input too low
 65  Electrical charging over voltage
 66  MAF (VAF) input too low
 67  Neutral drive switch drive or accelerator on (engine off)
 68  ITS open or AC on (engine-off test)
 69  Trans. hydraulic switch (THS 3/2) failed
 72  No MAP change in "goose test"
 73  No TPS change in "goose test"
 74  Brake on/off switch always open or not activated during test
 75  Brake on/off switch always closed or circuit shorted
 76  No MAF (VAF) change in "goose test"
 77  Operator did not do "goose test"
 79  Neutral drive switch (NDS) or A/C input signal interrupted
 81  Thermactor air bypass (TAB) circuit fault
 82  Thermactor air diverter (TAD) circuit fault
 83  EGR control (EGRC) circuit fault
 84  EGR vent (EGRV) circuit fault
 85  Canister purge (CANP) circuit fault
 86  WOT A/C cut-off circuit fault (all 3.8L and 5.0L Continental)
 87  Fuel pump circuit fault
 88  Throttle kicker circuit fault (5.0L)
 89  Check Continuity Of VPWR Circuit
 91  Right EGO always lean
 92  Right EGO always rich
 93  Right EGO cool down occurred
 94  Right secondary air inoperative
 95  Right air always upstream
 96  Right air always not bypassed
 97  RPM drop (with fuel lean) but right EGO rich
 98  RPM drop (with fuel rich) but right EGO lean
 99  ECA has not stored enough information to control idle speed (CFI engines only

** 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. Turn ignition key off
  2. Connect a jumper wire from Self Test Input (STI) to pin 2, Signal Return on the Self Test connector. Refer to diagram below.

Set analog voltmeter on a DC voltage range to read from 0 volts to 15 volts DC. Connect VOM from battery (+) to pin 4 Self Test Output (STO) in the Self Test connector.

 

 

 

 



 

 

 

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