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Ford OBD I Diagnostic Codes

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Full list of OBD I Diagnostic Trouble Codes for your Ford Vehicle. If your Check engine light is on you may have a serious problem. Scan your codes and follow the chart to determine what the code means. Some shops will scan your codes for free. Autozone is one place that will give you the code number. Or do it yourself with the procedure posted below.

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".

 
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Maintenance Procedures
   
 

Ford DTC's (Diagnostic Trouble Codes)

.

Data Link Connector (DLC) (Located Under hood)

 

Analog Voltmeter Connection ------->

.

Ford

 11  System PASS.
 12  Cannot control rpm during KOER Sell-Test high rpm check.
 13  Cannot control rpm during KOER Self-Test low rpm check.
 14  PIP Circuit failure.
 15  PCM Read Only Memory (ROM) teat failed.
 16  Rpm too low to perform H02S test.
 18  SPOUT circuit open.
 18  IDM circuit failure/ SPOUT circuit grounded.
 19  Failure In PCM Internal voltage.
 21  ECT out of Self-Test range MAP/BARO out of Self-Test range.
 22  MAP/BARO out of Self-Test range.
 23  TP out of Self-Test range.
 24  IAT out of Self-Test range.
 26  MAF out of Self-Test range.
 29  Insufficient input from the Vehicle Speed Sensor (VSS).
 31  EVP circuit below minimum voltage.
 32  EVP voltage below closed limit.
 33  EGR valve opening not detected.
 34  EVP voltage above closed limit.
 35  EVP circuit above maximum voltage.
 41  HO2S circuit indicates system lean (right HO2S).
 41  No HO2S switch detected (right HO2S).
 42  HO2S circuit indicates system rich (right HO2S).
 44  Secondary Air Injection system Inoperative (right side).
 45  Secondary Air Injection upstream during Self-Test.
 46  Secondary Air Injection not bypassed during Self-Test.
 51  ECT Indicated -40 C (-40 F) /circuit open.
 53  TP circuit above maximum voltage.
 54  IAT Indicated -4000 (-40"F) /circuit open.
 56  MAF circuit above maximum voltage.
 61  ECT Indicated 123 C (254 F) / circuit grounded.
 63  TP circuit below minimum voltage.
 64  IAT indicated 123 C (254 F) I circuit grounded.
 66  MAF circuit below minimum voltage.
 67  Park/Neutral Position (PNP) switch circuit open - A/C on during Self-Test.
 77  Brief WOT not sensed during Self-Test / Operator error.
 79  A/C on/Defrost on during Self-Test.
 81  Secondary -Air Injection Diverter (AIRD) solenoid circuit failure.
 82  Secondary Air Injection Bypass (AIRS) solenoid circuit failure.
 84  EGR Vacuum Regulator (EVR) circuit failure.
 85  Canister Purge (CANP) circuit failure.
 87  Fuel pump primary circuit failure.
 91  HO2S circuit Indicates system loan (left HO2S).
 91  No HO2S switch detected (left HO2S).
 92  HO2S circuit indicates system rich (left HO2S).
 94  Secondary Air Injection system Inoperative (left side).
 95  Fuel pump secondary circuit failure.
 

3 Digit codes

111

 

System checks OK

112

(O,M)

Intake Air Temperature (IAT) sensor is/was low or grounded - IAT

113

(O,M)

IAT sensor is/was high or open - IAT

114

(O,R)

IAT sensor out of range - IAT

116

(O,R)

Engine Coolant (ECT) sensor out of range - ECT

117

(O,M)

ECT sensor is/was low or grounded - ECT

118

(O,M)

ECT sensor is/was high or open - ECT

121

(O,R,M)

Throttle Position (TP) sensor out of range - TPS

122

(O,M)

TP low (possibly grounded or open circuit) - TPS

123

(O,M)

TP is/was high or short to power - TPS

124

(M)

TP voltage was higher than expected - Fuel control

125

(M)

TP voltage was lower than expected - Fuel control

126

(O,R,M)

MAP or BARO sensor out of range - ">MAP

128

(M)

MAP vacuum has not been changing - check vacuum lines - ">MAP

129

(R)

No MAP or Mass Air Flow sensor change during "goose" test - MAP MAF

136

(R)

Oxygen sensor not switching/system lean Left or Front HO2S - Fuel control

137

(R)

Oxygen sensor not switching/system rich Left or Front HO2S - Fuel control

138

(R)

Fault in Cold Start Injector circuit - Fuel control

139

(M)

Oxygen sensor not switching Left or Front HO2S - Fuel control

144

(M)

Oxygen sensor not switching Single, Right or Rear HO2S - Fuel control

157

(R,M)

Mass Air Flow signal is/was low or grounded - MAF

158

(O,R,M)

MAF sensor is/was high or short to power - MAF

159

(O,R)

MAF sensor is/was out of range - MAF

167

(R)

No Throttle Position sensor change in "goose" test (must get at least 25% rotation) - TPS

171

(M)

Oxygen sensor not switching - system was at adaptive limits - Single, Right or Rear HO2S - Fuel control

172

(R,M)

Oxygen sensor not switching - system is or was lean - Single, Right or Rear HO2S - Fuel control

173

(R,M)

Oxygen sensor not switching - system is or was rich - Single, Right or Rear HO2S - Fuel control

174

(M)

Oxygen sensor was slow in switching Single, Right or Rear HO2S - Fuel control

175

(M)

Oxygen sensor not switching - system was at adaptive limits - Left or Front HO2S - Fuel control

176

(M)

Oxygen sensor not switching - system is or was lean Left or Front HO2S - Fuel control

177

(M)

Oxygen sensor not switching - system was rich Left or Front HO2S - Fuel control

178

(M)

Oxygen sensor was slow in switching Left or Front HO2S - Fuel control

179

(M)

Fuel system was rich at part throttle Single, Right or Rear HO2S - Fuel control

181

(M)

Fuel system was lean at part throttle Single, Right or Rear HO2S - Fuel control

182

(M)

Fuel system was rich at idle Single, Right or Rear HO2S - Fuel control

183

(M)

Fuel system was lean at idle Single, Right or Rear HO2S - Fuel control

184

(M)

Mass Air (MAF) output higher than expected - Fuel control

185

(M)

Mass Air (MAF) output lower than expected - Fuel control

186

(M)

Injector pulse width longer than expected or Mass Air Flow (MAF) lower than expected - Fuel control

187

   

Injector pulse width shorter than expected or Mass Air Flow (MAF) higher than  expected - Fuel control

188

(M)

Fuel system was rich at part throttle - Left or Front HO2S - Fuel control

189

(M)

Fuel system was lean at part throttle - Left or Front HO2S - Fuel control

191

(M)

Fuel system was rich at idle - Left or Front HO2S - Fuel control

192

(M)

Fuel system was lean at idle - Left or Front HO2S - Fuel control

193

   

Failure in Flexible Fuel (FF) sensor circuit - Fuel control

194

(M)

Perform cylinder balance test to check for inoperative injectors

195

(M)

Perform cylinder balance test to check for inoperative injectors

211

(M)

Ignition PIP signal was erratic or missing - Ignition Systems

212

(M)

Ignition TACH signal was erratic (module/wiring) or SPOUT circuit fault - Ignition Systems

213

(R)

Ignition SPOUT or SAW circuit open or shorted - Ignition Systems

214

(M)

Error in Cylinder ID (CID) circuit or signal - Ignition Systems

215

(M)

Primary circuit failure - ignition coil 1 - Ignition Systems

216

(M)

Primary circuit failure - ignition coil 2 - Ignition Systems

217

(M)

Primary circuit failure - ignition coil 3 - Ignition Systems

218

(M)

IDM signal open or high or left coil pack failure - Ignition Systems

219

(M)

SPOUT circuit failure, timing defaulted to 10 degrees - follow code 213 diagnosis

222

(M)

IDM open or high or right coil pack failure - Ignition Systems

223

(M)

Dual Plug (DPI), SPOUT or IDM circuit fault - Ignition Systems

224

(M)

Failure in ignition coil primary circuit - Ignition Systems

225

(R)

Knock sensor not tested (ignore if not pinging) - KS

226

(O)

Ignition Diagnostic Monitor (IDM) signal fault - Ignition Systems

232

(M)

EI primary coil circuit failure - Ignition Systems

238

(M)

EI primary circuit failure - ignition coil 4 - Ignition Systems

311

(R)

AIR system not working - Single, Right or Rear HO2S - Air Injection

312

(R)

AIR not diverting - Air Injection

313

(R)

AIR not bypassing - Air Injection

314

(R)

AIR inoperative, Left or Front HO2S - Air Injection

326

(R,M)

Pressure Feedback EGR shows low pressure EGR not seating or not seating intermittantly - PFE

327

(O,R,M)

EGR feedback signal is/was low - EVR or PFE

328

(O,R,M)

EGR Valve Position (EVP) is/was low - EVR

332

(R,M)

EGR did not open/respond during test or if memory code, did not open intermittantly - EVR or PFE

334

(O,R,M)

EVP sensor is/was high - EVR

335

(O)

EGR feedback signal is/was out of range - EVR or PFE

336

(O,R,M)

PFE sensor signal is/was was high - ">PFE

337

(O,R,M)

EGR feedback signal is/was was high - EVR

338

(M)

Cooling system did not heat up (check cooling system / thermostat operation)

339

(M)

Cooling system overheated (check cooling system / thermostat operation)

341

(O)

Octane jumper installed (information only code to notify you if it is installed)

411

(R)

Idle speed system not controlling idle properly (generally idle too high) - ISC

412

(R)

Idle speed system not controlling idle properly (generally idle too low) - ISC

452

(M)

Vehicle Speed Sensor (VSS) problem

511

(O)

No power to PCM pin 1 or bad PCM (processor)

512

(M)

Memory power (PCM pin 1) was interrupted - Was battery disconnected ?

513

(O)

Replace processor (PCM) (internal failure)

519

(O)

PSP switch/circuit open - PSP h Pedal Position (CPP) circuit fault - PNP

528

(M)

System shows voltage at pin 10 (is A/C on ?) or pin 30 (PNP, CPP switch) - PNP

529

(M)

Data Communications Link to processor failure Service any EEC codes, erase memory and retest  If code is still present refer to instrument cluster diagnosis manual

533

(M)

Data Communications Link to instrument cluster failure - see 529

536

(O,R,M)

Brake On Off open or shorted to ground - BOO

538

(R)

System did not receive "goose" test - TESTS

539

(O)

System shows voltage at PCM pin 10  Is A/C on ?

542

(O,M)

Fuel pump open, bad ground or always on - - Power / Fuel Pump Circuits

543

(O)

Fuel pump monitor circuit shows no power - Power / Fuel Pump Circuits

 

(M)

(Service 556 code first if present) Fuel pump relay or battery power feed was open - Power / Fuel Pump Circuits

551

           

Problem in Intake Manifold Runner Control (IMRC) solenoid/circuit - Solenoids

552

(O)

AIRB solenoid/circuit failure - Solenoids

553

(O)

AIRD solenoid/circuit failure - Solenoids

554

(O)

Fuel Press Regulator Control solenoid/circuit fault - Power / Fuel Pump Circuits

556

(O,M)

Fuel pump relay primary circuit fault - Power / Fuel Pump Circuits

557

(O,M)

Low speed pump relay primary circuit fault - Power / Fuel Pump Circuits

558

(O)

EGR vacuum regulator solenoid/circuit failure - EVR or PFE or Solenoids

559

(O)

A/C relay primary circuit fault - A/C and Fan Circuits

563

(O)

High Fan Control (HFC) circuit failure - A/C and Fan Circuits

564

(O)

Fan Control (FC) circuit failure - A/C and Fan Circuits

565

(O)

Canister Purge 1 solenoid/circuit failure - Solenoids

566

(O)

transmission 3/4 shift solenoid/circuit - Transmissions

569

(O)

Canister Purge 2 solenoid/circuit failure - Solenoids

578

(M)

A/C pressure sensor VREF short to ground - A/C and Fan Circuits

579

(M)

ACP sensor did not change with A/C on - A/C and Fan Circuits

581

(M)

Cooling fan current was excessive - A/C and Fan Circuits

582

(O)

Open cooling fan circuit - A/C and Fan Circuits

583

(M)

Fuel pump current was excessive - Power / Fuel Pump Circuits

584

(M)

Open power ground circuit - Power / Fuel Pump Circuits

585

(M)

A/C clutch current was excessive - A/C and Fan Circuits

586

(M)

Open circuit in A/C clutch - A/C and Fan Circuits

587

(O, M)

Communication problem between PCM and Variable Control Relay Module (VCRM) - Power / Fuel Pump Circuits

617

(M)

Transmission shift failure (1/2 shift) - Transmissions

618

(M)

Transmission shift failure (2/3 shift) - Transmissions

619

(M)

Transmission shift failure (3/4 shift) - Transmissions

621

(O)

Solenoid/circuit failure - shift solenoid 1 - Transmissions

622

(O)

Solenoid/circuit failure - shift solenoid 2 - Transmissions

624

(O,M)

Solenoid/circuit failure -Electronic Pressure Control (EPC) current is high - Transmissions

625

(O,M)

Solenoid/circuit failure - Electronic Pressure Control (EPC) current is low - Transmissions

626

(O)

Transmission Coast Clutch (CCS) Solenoid/circuit fault - Transmissions

627

(O)

Torque Converter Clutch circuit fault - Transmissions

628

(M)

Excessive converter clutch slippage - Transmissions

629

(O,M)

Torque Converter Clutch circuit fault - Transmissions

631

(O)

Overdrive Cancel Light circuit problem - Transmissions

632

(R)

E4OD - Transmission Control Switch (TCS) should be cycled once between engine ID and  Goose test

633

(O)

4x4L switch should be in 4x2 or 4x4 high for the test

634

(O,M)

Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault  Electronic shift transmission - Manual Lever Position (MLP) sensor out of range in Park-Transmissions

636

(O,R)

Transmission Oil Temperature (TOT) sensor out of range - Transmissions

637

(O,M)

TOT sensor is/was high or open - Transmissions

638

(O,M)

TOT sensor is/was low or grounded - Transmissions

639

(R,M)

Transmission Speed sensor (TSS) circuit fault - Transmissions

641

(O)

Transmission solenoid/circuit failure Shift Solenoid 3 - Transmissions

643

(O,M)

Torque Converter Clutch (TCC) circuit - Transmissions

645

(M)

Transmission 1st gear failure - Transmissions

646

(M)

Transmission 2nd gear failure - Transmissions

647

(M)

Transmission 3rd gear failure - Transmissions

648

(M)

Transmission 4th gear failure - Transmissions

649

(M)

Transmission EPC system failure - Transmissions

651

(M)

Transmission EPC solenoid/circuit fault - Transmissions

652

(O)

Torque Converter Clutch (TCC) circuit fault - Transmissions

654

(O)

Transmission selector not in PARK - Transmissions

656

(M)

Torque Converter Clutch (TCC) slip - Transmissions

657

(M)

Transmission temperature was excessive - Transmissions

 

 

 
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