Ford OBD1 Codes and Procedure

Ford Fuel Injection » How To Run a Self-Test

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How To Run a Self-Test Don’t worry if the Check Engine Light is not on, the computer will store lesser important codes without flashing lights i n your face. First you need to find the self-test plugs to read read codes from the EEC. EEC. There are 2 plugs to find. One is triangular and has 6 pins; it is called the Self-Test plug. The other is a smaller single pin plug; it is called the Self-Test Input (STI). These are what the plugs look l ike. The self-test plugs are located along the driver driver s side fende fenderr by the firewall firewall on on 1986-95 1986-95 Mustangs Mustangs..

The self-test self-test plugs plugs are located located along along the driver driver s side fender fender behind behind the air filter box on 1987-95 EFI trucks.

The self-test plugs were mounted on the passenger side fender fender on 1985-86 EFI trucks.

Ford Fuel Injection » How To Run a Self-Test

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How to Prepare for the Self-Test

To check for codes without buying a code reader is simple. If your EEC is wi red correctly, the engine light works, and there are not any electrical faults in the vehicle you can get the codes out of your EEC. 1. Turn key to OFF. 2. Get a length of wire that can connect the STI to the negative battery terminal or body ground. 3. Ground the Self-Test Input. 4. Get some paper and a pen. 5. Get comfortable in the drivers seat. 6. Try to keep your self from getting distracted from here on. 7. Turn key to RUN. 8. You will hear some relays engage and the fuel  pumps prime the system. This is the EEC  beginning the test. 9. When the fuel pumps stop be r eady to count! If you are a lost soul that does not have a working engine light, or did not install a light into your dash don t fret. You can can still get the codes. You still need that wire to ground out the STI. Now you will need one of the following tools; digital volt meter, analog volt meter, test light, or you can hook up any other 12 volt light that does not draw more than 0.5 watts max. 1. Turn key to OFF. 2. Get a length of wire that can connect the STI to the negative battery terminal or body ground. 3. Ground the Self-Test Input. 4. Attach one side of the test device to the Self-Test Output (STO). 5. Attach the other lead to the positive side of the battery. a) If you are are using a digital digital voltmeter voltmeter you you ll want to use use the continuity continuity setting. setting.  b) If you are are using an an analog voltmet voltmeter er you ll be counting counting the meter meter make sweeps. sweeps. c) If you are using using a cheep cheep light light you ll count count like the the rest of us. 6. Get some paper and a p en. 7. Get comfortable in the drivers seat. 8. Try to keep your self from getting distracted from here on. 9. Turn key to RUN.

Ford Fuel Injection » How To Run a Self-Test

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10. You will hear some relays engage and the fuel pumps prime the system. This is the EEC beginning the test. 11. When the fuel pumps stop be ready t o count! How To Count “Check Engine” Light Blinks

When the “Check Engine” light blinks during the test you will get several different blinks, the separation time between blinks is used to indicate what information is being displayed. Turn key to RUN. You will hear some relays engage and t he fuel pumps prime the system. This i s the EEC beginning the test. The fuel pumps will stop and the EEC will now begin giving codes. You may catch a brief flickering of t he light. This is a rapid code read that is used by t he code readers you can purchase. Do not worry all those rapid flashes you just say say flicker buy will now be given at a slower pace of  , 2, & 4 second pauses. pauses. First digit of first KOEO code (1/2 second between blinks) 2 second pause Second digit of first KOEO code (1/ 2 second between blinks) 4 second pause  Next KOEO code Once all KOEO codes are read the EEC will repeat them 6 second pause Single Separator Blink (this indicates the change from KOEO codes to CM codes) 6 second pause Codes from Continues Memory (uses same 1/2, 2, and 4 second timing as KOEO codes and also repeats t hem) If nothing has been recorded by the EEC since last battery disconnect you will see: Blink - 2 sec - blink blink - 4 sec - blink blink - 2 sec - blink - 6 sec sec - blink - 6 sec - blink blink - 2 sec - blink blink - 4 sec - blink - 2 sec sec 

blink 

This translates into 11-11 current condition (KOEO) and 11-11 in the continues memory (CM); or SYSTEMPASS This may seem hard to count; r ecommendation is to record codes with slashes, and to lump them all together. Sort them out into numerical codes later. Here is an example of this:

This would give you codes; 41, 83, 14 & 18. If you miss some of the codes or feel you are counting wrong continue to count the remaining codes for practice and to compare to the next code test. When finished simply turn the key to OFF wait 15 seconds then back to RUN. The codes will be presented again. Complete list of 2-Digit Self-Test Codes and their definitions. Complete list of 3-Digit Self-Test Codes and their definitions. If you can not get codes; read about Solving a No Code Problem here. 

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Ford Fuel Injection » 2 Digit Self-test Codes 11-32

X X

32

PFE or EVP circuit has intermittently failed below minimum voltage of 0.24 volts. X

X

EVP circuit below minimum voltage of 0.24 volts. EVP circuit has intermittently failed below minimum voltage of 0.24 volts.

Codes 33-58 Codes 59-74 Codes 75-99 Three Digit Codes

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Ford Fuel Injection » Two Digit Codes 75-99 7 5-99

98

X X

99

X

Hard fault present. Electronic pressure control circuit failure (E4OD).

X

EEC syst system em hasn hasn t learned learned to cont control rol idle. idle.

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 10-32 Codes 33-58 Codes 59-74 Three Digit Codes

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Ford Fuel Injection » 3 Digit Self-test Codes 111-171

3 Digit Self-test Codes 111-171  Abbreviations:

KOEO = Key On Engine Off  CM = Continues Memory KOER = Key On Engine Running

# NC 111 112

When KOEO X X X

CM X X

KOER

X X

X 113

X X

114 116 117

X X X

X X

X 118

X X

121

X

X X

122

X X

123

X X

124

X

125

X

126 128

X

X X

X

129

X

136 137 139

X X X

3-Digit Code Definitions Definitions No Codes System pass ACT sensor signal is less than the Self-Test minimum minimum of  0.2 volts. ACT circuit has intermittently intermittently failed below minimum 0.2 volts. ACT sensor signal is greater than the Self-Test maximum of 4.6 volts. ACT circuit has intermittently intermittently failed above the maximum of 4.6 volts. ACT out of self test range 0.3 0.3 to 3.7 volts. ECT out of self self test range range 0.3 to 3.7 volts. ECT sensor signal is less than the Self-Test minimum of  0.2 volts. ECT circuit has intermittently failed below minimum 0.2 volts. ECT sensor signal is greater than the Self-Test maximum of 4.6 volts. ECT circuit has intermittently failed above the maximum of 4.6 volts. Closed throttle TPS voltage higher or lower than expected. TP sensor was inconsistent with the MAF/MAP value in the last 80 drive cycles. TPS circuit below minimum minimum 0.6 volts. TPS circuit has intermittently failed below minimum 0.6 volts. TP circuit above maximum maximum 4.5 volts. TPS circuit has intermittently failed above maximum 4.5 volts. TP sensor was higher than expected with the MAF/MAP value in the last 80 drive cycles. TP sensor was lower than expected with the MAF/MAP value in the last 80 drive cycles. MAP/BP sensor out of self self test range 1.4 to 1.6 volts. MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation. Insufficient MAF/MAP change during Dynamic Response Test. HEGO sensor circuit indicates system lean (left (left side) HEGO sensor circuit indicates indicates system rich (left (left side) No HEGO sensor switching switching detected detected or disconnected

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Ford Fuel Injection » 3 Digit Self-test Codes 111-171

141 144

X X

157

X

158

X

159

X

X

X 167

X

171

X

(left side) HEGO sensor circuit indicates indicates system lean (both (both sides) No HEGO sensor switching detected or disconnected (right side) MAF sensor went below 0.4 volts during the last 80 warm-up cycles. MAF sensor went above 4.5 volts during the last 80 warm-up cycles. MAF signal was greater than 0.70 volt during during KOEO. MAF signal was not between 0.20 and 1.50 volts during KOER. TPS did not exceed 25% rotation during the Dynamic Response Test. Fuel system at adaptive limit, HEGO unable to switch (right side)

Codes 172-223 Codes 224-525 Codes 526-586 Codes 587-656 Codes 657-999 Two Digit Codes

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Ford Fuel Injection » Three Digit Codes 172-223

Three Digit Codes 172-223

#

When KOEO

3-Digit Code Definitions Definitions CM

172 173 174 175

X X

176 177 178 179

X X X X

181

X

182 183 184 185 186 187 188

X X X X X X X

189

X

191 192 193 194 195

X X

KOER

X X

X X X

211

X

212 213 214 215 216 217 218 219

X

222 223

X X

X X X X X X X

HEGO sensor circuit indicates indicates system lean (right (right side) HEGO sensor circuit indicates system rich (right (right side) HEGO switching time is slow Fuel system at adaptive limit, HEGO unable to switch (left side) HEGO sensor circuit indicates system lean (left (left side) HEGO sensor circuit indicates indicates system rich (left (left side) HEGO switching time is slow. Right side still rich, at leanest adaptive limit, during part throttle. Right side still lean, at richest adaptive limit, during part throttle. Right side still still rich, at leanest adaptive adaptive limit, at idle. Right side still lean, lean, at richest adaptive adaptive limit, at idle. MAF higher higher than expected expected MAF lower than than expected expected Injector pulse pulse width longer longer than expected Injector pulse pulse width shorter shorter than expected Left side still rich, at leanest adaptive limit, during part throttle. Left side still lean, at richest adaptive adaptive limit, during part throttle. Left side still rich, at leanest adaptive limit, at idle. Left side still still lean, at richest adaptive adaptive limit, at idle. Flexible Fuel sensor circuit failure. Run cylinder balance diagnostic test. Run cylinder balance diagnostic test. Two or more successive successive erratic Profile Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall. Loss of IDM input to EEC or SPOUT SPOUT circuit grounded. grounded. SPOUT circuit open Cylinder Identification Identification (CID) circuit circuit failure EEC detected coil coil 1 primary primary circuit failure failure EEC detected coil coil 2 primary primary circuit failure failure EEC detected coil coil 3 primary primary circuit failure failure Loss of IDM IDM signal (left side) SPOUT failure, spark timing has defaulted to 10 degrees BTDC. Loss of IDM IDM signal (right side) Loss of Dual Dual Plug Inhibit Inhibit control

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 111-171 Codes 224-525 Codes 526-586

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Ford Fuel Injection » Three-Digit Codes 224-525

Three-Digit Codes 224-525

#

When KOEO

224 225

3-Digit Code Definitions Definitions CM X

KOER

X

226 244 311 312 313 314 326

X

327

X

X X X X X X

X

X

X

328 332 334

X

X X X

X X X

335 336

X X

X

337

X

X

X

338 339 341

X

X X X

381

X

411 412 452

X X X

461 511 512

X

X X X

513 519 521

X

522 524

X X

X

525

X

X

X

X X

Erratic IDM input to processor Knock Sensor (KS) signal not sensed during dynamic response test. IDM signal signal not received received Camshaft Position Position (CMP) Sensor Sensor failure. Thermactor air air system inoperative inoperative (right side) Thermactor air misdirected misdirected upstream during during self test. Thermactor air air not bypassed during during self test. Thermactor air air system inoperative inoperative (left side) PFE or DPFE circuit voltage voltage lower than expected with zero EVR duty cycle. DPFE or EVP circuit below minimum voltage of 0.2 volts. EVP circuit below minimum minimum voltage of 0.24 volts. EGR valve opening not detected. DPFE or EVP circuit above the closed limit of 0.67 volts. PFE or DPFE sensor voltage voltage out of Self-Test range. range. EVP or DPFE circuit voltage above maximum voltage with zero EVR duty cycle. DPFE or EVP circuit above the maximum limit of 4.81 volts. ECT lower than expected expected.. ECT higher higher than expected. Octane Adjust shorting bar is not in or the OCT ADJ circuit is open. Frequent A/C compressor clutch (ACCS) cycling less than 8.5 seconds. Cannot control rpm during KOER low RPM check  Cannot control rpm during KOER high RPM check  Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles. Engine over speed was detected EEC permanent Read Only Only Memory (ROM) test failed. failed. EEC battery powered Keep Alive Memory (KAM) test failed. Failure in EEC processor internal internal voltage. Power steering pressure switch switch circuit open. Power steering pressure switch did not change state during KOER test. Vehicle not not in PARK or NEUTRAL during during KOEO When the PCM commanded the fuel pump on, voltage was not detected on FPM. Vehicle in gear gear or A/C on during during Self-Test

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running

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Ford Fuel Injection » Three-Digit Codes 526-586

Three-Digit Codes 526-586

# 526 527 528 529

When KOEO X X

3-Digit Code Definitions Definitions CM

X X

532

X

533

X

536

X

538

X X

539 542 543

X X X

551 552 553 554

X X X X

556 557 558 559 563 564 565 566 569 571 572 578

X X X X X X X X X X X

X X

X X

X

579

X

581

X

582

KOER

X

583

X

584 585 586

X X X

Neutral Pressure Switch closed or A/C on Neutral Neutral Drive Switch Switch open or A/C on Clutch Switch Switch Circuit failure failure Data Communications Link or Electronic Instrument Cluster circuit failure. Data Communications Link or Electronic Instrument Cluster circuit failure. Data Communications Link or Electronic Instrument Cluster circuit failure. Brake On/Off circuit failure / switch not actuated during KOER test Insufficient RPM change during KOER dynamic response test/ Operator error  A/C or Defroster Defroster ON during KOEO KOEO test Fuel pump circuit failure When the PCM commanded the fuel pump on, voltage was not detected on FPM. Intake Manifold Runner Control (IMRC) circuit failure Air management management 1 circuit circuit failure (AM1/TAB) (AM1/TAB) Air management management 2 circuit circuit failure (AM1/TAD) (AM1/TAD) Fuel Pressure Regulator Control (FPRC) solenoid circuit failure Fuel Pump circuit failure Fuel pump relay coil resistance failure EGR Vacuum Regulator Regulator circuit failure failure Air Conditioning Conditioning On relay circuit failure High Speed Electro-Drive Fan circuit failure Electro-Drive Electro-Drive Fan circuit failure Canister purge circuit failure 3  4 Shif Shiftt Sol Solen enoi oid d fail failure ure Canister purge 2 circuit failure EGR Atmospheric Regulator circuit failure. EGR Vacuum Regulator Regulator circuit failure. failure. A/C Pressure (ACP) sensor VREF circuit is short to ground. A/C Pressure (ACP) sensor circuit is above maximum voltage. When the cooling fan was activated, the circuit exceeded current draw. Open or short to power in the power-to-cooling fan circuit. When the fuel pump was activated, the power-to-pump circuit exceeded the normal current draw. Variable Control Relay Module circuit grounded. A/C clutch circuit exceeded exceeded the normal normal current draw. A/C clutch circuit circuit open or or shorted to power 

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Ford Fuel Injection » Three-Digit Codes 587-656

Three-Digit Codes 587-656

# 587 593 617 618 619 621 622 623 624

When KOEO X X

X X X X

625 626 627 628 629 631 632 633 634

X X X

636 637 638 639 641 643 645 646 647 648 649 651 652

X X X

X X

3-Digit Code Definitions Definitions CM X X X X X

X X

X X X

X X

X X

X X X X X

X

X X X X X X X

X

653 654 656

KOER

X X X

Data Communications Link (DCL) error Oxygen Sensor Heater circuit failure 1 - 2 shift error error (E4OD) (E4OD) 2 - 3 shift error error (E4OD) (E4OD) 3 - 4 shift error error (E4OD) (E4OD) Shift solenoid #1 circuit failure Shift solenoid #2 circuit failure Overdrive light circuit failure Electronic Pressure Control solenoid or driver circuit failure Electronic Pressure Pressure Control driver open in EEC Coast clutch solenoid circuit circuit failure (E4OD) Converter clutch solenoid solenoid circuit failure (E4OD) Converter clutch clutch Lock-Up error (E4OD) Converter clutch clutch control circuit circuit failure Overdrive light circuit failure Overdrive cancel switch switch not changing state (E4OD) (E4OD) 4WD switch is closed Transmission Manual Lever Position Sensor circuit out of self test. TOT sensor voltage voltage out of self self test range. TOT sensor circuit circuit above maximum maximum voltage TOT sensor circuit circuit below minimum minimum voltage Insufficient input input from the Transmission Speed Speed Sensor Shift solenoid solenoid #3 circuit circuit failure Converter Clutch Clutch Control circuit circuit failure Incorrect gear ratio ratio obtained for first gear Incorrect gear ratio ratio obtained for second gear Incorrect gear ratio ratio obtained for third gear Incorrect gear ratio ratio obtained for fourth gear Electronic Pressure Pressure Control range failure Electronic Pressure Pressure Control circuit failure failure Modulated Converter Clutch Control solenoid output circuit error Transmission Control Switch was not cycled during KOER Self-Test. MLP sensor not in park position Converter Clutch Control Control continuous slip slip error detected

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 111-171 Codes 172-223 Codes 224-525 Codes 526-586 Codes 657-999

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Ford Fuel Injection » Three-Digit Codes 657-998

Three-Digit Codes 657-998

#

When KOEO

3-Digit Code Definitions Definitions

657 659

CM X X

667

X

668 675 691 998 NC

X X X X

X

KOER

X

Transmission over temperature condition condition occurred. High vehicle speed detected while the vehicle was in PARK. Transmission Manual Lever Position Sensor circuit shorted Transmission Manual Manual Lever Position Position Sensor circuit open open MLP circuit voltage voltage was out of the expected expected range. 4WD switch circuit failure. Hard fault present No Codes

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running Codes 111-171 Codes 172-223 Codes 224-525 Codes 526-586 Codes 587-656 Two Digit Codes

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