DIAGNOSTIC CODES AND WHAT TO LOOK FOR
Here is the lowdown on diognostic codes for the EEC-4 system, and I have left some codes out. If you get a code that is not listed e-mail me and I will look it up. Also be aware that a common mistake during code retrieval is failing to warm up the engine as this sets 'ghost codes' such as coolant sensors, and O2 sensors. Another common error is the 'dynamic response' when getting codes. This is a driver action during diognostics to test some components, like nailing the throttle to floor and releasing it (testing the TPS) pushing the brakes (testing the brake switch), and turning the steering wheel (testing the power steering switch).After the codes I have a list of the abbreviations used. Also you should get an 11, then a 10, then another 11 if all is well. The first 11 means no memory codes have been set. The 10 is a separator code, then the second 11 means no codes are present at this time. The first codes will be errors in the past, and the second codes are currently happening.
CODES
| CODE | ERROR | WHAT TO LOOK FOR |
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| 12 | cant control idle | vachum leak,TB base idle off,idle air valve dirty or bad, EGR stuck open |
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| 13 | idle out of spec | same as code 12 |
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| 14 | intermittant PIP | TFI module most likely, but mag pickup could be bad |
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| 15 | ECA KAM failure | Battery dead or disconnected,bad power ECM relay or fuse |
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| 16 | RPM to low | bad idle air valve, dirty throttle body |
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| 17 | O2 rich | Fuel regulator,map sensor bad, no vachum to MAP,bad injector,dead O2. |
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| 18 | no tach signal | Bad TFI, bad mag pickup, DIS bad coil |
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| 19 | ECM failure | ECM dead or dying |
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| 21 | ECT out of range | ECT bad, engine not warmed up , bad thermostat,low coolant. |
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| 22 | MAP out of spec | Bad MAP sensor, vachum leak, bad hose to MAP sensor |
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| 23 | TPS out of range | Bad TPS,throttle body base idle mis-set,dirty/sticking TB, no dynamic response |
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| 24 | ACT/VAT out of range | Bad ACT/VAT sensor, on EDIS systems coil 1 bad |
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| 26 | VAF/MAF out of range | Bad VAF/MAF, leaking air hose from sensor to engine |
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| 27 | VSS low | Speed sensor bad or unplugged,EDIS coil 2 bad |
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| 28 | VAT low | Vat bad, leak in hose from VAT to engine, EDIS coil 3 bad, DIS right coil bad |
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| 29 | VSS low | Bad or unplugged VSS, |
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| 31 | EVP/PFE low | Bad EVP/PFE sensor, no exhaust backpressure (really doesn't really cause problems) or inopperative EGR |
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| 32 | EVP/PFE high | EGR sticking open, bad EVP/PFE sensor, clogged exhaust or convertor |
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| 33 | EGR not opening | Clogged or bad EGR, bad EVP/PFE sensor, and even a sluggish O2 can set this. |
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| 34 | EVP/PFE high | Same as code 32 |
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| 35 | EVP/PFE high | SAme as codes 32 and 34 |
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| 38 | ITS open | Bad or unplugged ITS |
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| 39 | Lock-up convertor | Lock-up solenoid bad or unplugged |
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| 41 | O2 low (lean) | Vachum leak, EGR stuck open,bad MAP sensor, bad O2, clogged fuel filter,weak fuel pump |
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| 42 | O2 high | Bad O2, bad MAP sensor, Bad fuel regulator, Leaking injectors, restriction in fuel return line, clogged exhaust lowering vachum |
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| 43 | O2 lean at WOT | Bad O2, bad MAP sensor, and same as code 41 |
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| 45 | EDIS coil bad | EDIS coil 1, 2, 3, or 4 failed |
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| 46 | EDIS coil | EDIS coil 2 failed |
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| 47 | O2 rich, VAF low | Same as code 42, VAF bad, leak in hose from VAF to engine, Air filter dirty |
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| 48 | VAF high, DIS coil | DIS coil 3 failed, VAF bad. |
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| 49 | EDIS SAW,spout | TFI bad, spout unplugged, SAW signal bad |
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| 51 | ECT high | Bad ECT, sticking thermostat, low coolant, clogged convertor. |
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| 52 | PSPS open | Bad or unplugged PSPS, no dynamic response |
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| 53 | TPS high | Bad TPS, dirty/sticking TB, base idle set wrong, throttle cable sticking |
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| 54 | ACT/VAT high | Bad or unplugged ACT/VAT, inop heated air inlet. |
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| 55 | Key power low | Short in wiring to ECM power, low charging from alternator. |
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| 56 | MAF/VAF high | Bad MAF/VAF |
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| 58 | VAT high | Bad VAT |
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| 59 | Low speed fuel pump | Bad fuel pump,wiring to pump. |
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| 61 | ECT low | Bad ECT, or thermostat, engine not warm, low coolant. |
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| 62 | Convertor clutch | Converotr bad, lockup solenoid bad or unplugged. |
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| 63 | TPS low | Bad or misadjusted TPS, TB base idle mis-set, binding throttle cable |
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| 64 | ACT/VAT low | Bad ACT/VAT |
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| 65 | Voltage high | Alternator bad, overcharging, voltage over 17 volts |
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| 66 | MAF/VAF low | Bad MAF/VAF, leak in hose from MAF/VAF to engine. |
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| 68 | VAT low | Bad VAT |
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| 70 | ECM DCL | Data communication link error, bad ECM |
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| 71 | ECM software reset | Never seen this one, probably a limit such as RPM exceeded? |
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| 72 | MAP | No change in MAP signal, no dynamic response usually sets this. |
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| 73 | TPS | No change in TPS signal, no dynamic response sets this. |
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| 74 | BOO | Usually sets when brakes aren't tapped during dynamic response. |
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| 75 | BOO closed | Bad or mis-adjusted BOO switch |
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| 76 | VAF | NO change in VAF during dynamic response. |
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| 77 | No dynamic response | no one performed the dynamic responses during code retrieval |
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| 78 | Power interrupt | Interruption in ECM power, battery disconnected, ECM power relay bad. |
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| 79 | A/C on | A/C was on during self-test |
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| 83 | EGR,Fuel relay | Bad or unplugged EGR solenoid, low speed fuel pump relay bad |
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| 84 | EGR solenoid | Same as code 83 |
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| 85 | CANP, lean limit | Problem with the CANP, a rich condition causing the ECM to hit its lean limit. |
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| 86 | ECM rich limit | ECM hit rich limit, due to a lean condition, vachum leak, fuel filter, fuel pump |
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| 87 | Fuel pump relay | Failure of the fuel pump power relay or circuit |
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| 88 | COO solenoid | Failure of the convertor over-ride solenoid, or circuit |
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| 89 | LUS/COO solenoid | Same as code 88 |
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| 91 | O2 lean | Bad O2, vachum leak,fuel pressure low (clogged filter, regulator, pump) EGR stuck open |
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| 93 | TPS low | Same as code 63 |
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| 95 | Fuel pump | Fuel pump monitor has seen a fault in the fuel pumps or circuit |
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| 96 | High speed fuel pump | High speed fuel pump or circuit failure |
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| 98 | Failure mode | Some failure has set ECM in 'failure effects mode', bad ECM, or could be about anything |
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| 99 | ECM cannot control idle | Usually found with codes 12, and 13. Same things cause it. |
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ABBREVIATIONS
| DLL | Data communication link | BOO | Brake on/off switch |
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| CANP | Fuel cannister purge solenoid | FP | Fuel pump |
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| LUS | Convertor clutch lockup solenoid | COO | Convertor clutch over-ride |
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| FPM | Fuel pump monitor | PIP | Profile ignition pickup signal |
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| ECA | Engine control assy | ECM | Engine control module |
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| KAM | ECM keep alive memmory | EGO | The O2 sensor |
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| ECT | Engine coolant temp sensor | MAP | Manifold absolute pressure sensor |
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| TPS | Throttle position sensor | ACT | Air charge temp sensor |
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| VAT | Vane air temp sensor | VSS | Vehicle speed sensor |
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| VAF | Vane air flow meter | MAF | Mass air flow meter |
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| EGR | Exhaust gas recircularitory valve | EVP | EGR valve position sensor |
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| PFE | Exhaust backpressure feedback sensor | ITS | Idle tracking switch |
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| WOT | Wide open throttle | TB | Throttle body |
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| DIS | Distributerless ignition system | EDIS | Distributerless ignition system |
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| PSPS | Power steering pressure sensor | WHAKO | What you get trying to outsmart computers |
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These codes are not the complete list, as this list is geared more toward the Ford Ranger. It is fairly generic towards all Fords, so if you get a code you cannot find here, E-mail me and I will find it for you.