Diagnostic Trouble Codes - 1986
Ford
| 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.
- Turn ignition key off
- 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.
Diagnostic Connector (Located Underhood)
