Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1995 Ford Escort Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Performance DTCS
ENGINE PERFORMANCE DTCS
| DTC | Description | Circuit Test/Step: KOEO | Circuit Test/Step: KOER | Circuit Test/Step: CONT. | ||
|---|---|---|---|---|---|---|
| No Code | No Codes/Codes Not Listed | QA1 | QA1 | QA1 | ||
| 111 | System Pass | Pass | Pass | Pass | ||
| 112 | Intake Air Temperature Sensor Circuit Low Input | DA20 | - | DA90 | ||
| 113 | Intake Air Temperature Sensor Circuit High Input | DA10 | - | DA90 | ||
| 114 | Intake Air Temperature Sensor Circuit Voltage Higher Or Lower Than Expected | DA1 | DA1 | - | ||
| 116 | Engine Coolant Temperature Sensor Circuit Voltage Higher Or Lower Than Expected | DA1 | DA1 | - | ||
| 117 | Engine Coolant Temperature Sensor Circuit Low Input | DA20 | - | DA90 | ||
| 118 | Engine Coolant Temperature Sensor Circuit High Input | DA10 | - | DA90 | ||
| 121 | Throttle Position Sensor Fault | DH 2 | DH 1 | G 1 | ||
| 122 | Throttle Position Sensor Circuit Low Input | DH10 | - | DH94 | ||
| 123 | Throttle Position Sensor Circuit High Input | DH3 | - | DH90 | ||
| 124 | Throttle Position Sensor Voltage Higher Than Expected | - | - | G1 | ||
| 125 | Throttle Position Sensor Voltage Lower Than Expected | - | - | G1 | ||
| 126 | Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Voltage Higher/Lower Than Expected | DF1 | DF1 | DF90 | ||
| 128 | Manifold Absolute Pressure Sensor Vacuum Hose Damaged/Disconnected | - | - | DF11 | ||
| 129 | Insufficient Mass Air Flow Change During Dynamic Response Test KOER | - | DC13 | - | ||
| 136 | System Indicates Lean (Bank 2) | - | H1 | - | ||
| 137 | System Indicates Rich (Bank 2) | - | H1 | - | ||
| 139 | No Heated Oxygen Sensor (HO2S-2) Switches Detected (Bank 2) | - | - | H1 | ||
| 144 | No Heated Oxygen Sensor (HO2S-1) Switches Detected (Bank 1) | - | - | H1 | ||
| 157 | Mass Air Flow Sensor Circuit Low Input | - | - | DC10 | ||
| 158 | Mass Air Flow Sensor Circuit High Input | DC22 | - | DC22 | ||
| 159 | Mass Air Flow Sensor Circuit Voltage Higher Or Lower Than Expected | DC1 | DC1 | - | ||
| 167 | Insufficient Throttle Position Change During Dynamic Response Test KOER | - | DH20 | - | ||
| 171 | Fuel System At Adaptive Limits (Bank 1) | - | - | H1 | ||
| 172 | System Indicates Lean (Bank 1) | - | H1 | H1 | ||
| 173 | System Indicates Rich (Bank 1) | - | H1 | H1 | ||
| 174 | Fuel Control | - | - | H1 | ||
| 175 | Fuel System At Adaptive Limits (Bank 2) | - | - | H1 | ||
| 176 | System Indicates Lean (Bank 2) | - | - | H1 | ||
| 177 | System Indicates Rich (Bank 2) | - | - | H1 | ||
| 178 | Fuel Control | - | - | H1 | ||
| 179 | Fuel System At Lean Adaptive Limit At Part Throttle, System Rich (Bank 1) | - | - | HA1 | ||
| 181 | Fuel System At Rich Adaptive Limit At Part Throttle, System Lean (Bank 1) | - | - | HA1 | ||
| 184 | Mass Air Flow Sensor Voltage Higher Than Expected | - | - | G7 | ||
| 185 | Mass Air Flow Sensor Voltage Lower Than Expected | - | - | G7 | ||
| 186 | Injector Pulsewidth Higher Than Expected | - | - | G9 | ||
| 187 | Injector Pulsewidth Lower Than Expected | - | - | G7 | ||
| 188 | Fuel System At Lean Adaptive Limit At Part Throttle, System Rich (Bank 2) | - | - | HA1 | ||
| 189 | Fuel System At Rich Adaptive Limit At Part Throttle, System Lean (Bank 2) | - | - | HA1 | ||
| 194 | Fuel Control | - | - | H5 | ||
| 195 | Fuel Control | - | - | H5 | ||
| 211 | Profile Ignition Pickup Circuit Failure | - | - | NC1 | ||
| 212 | Loss Of Ignition Diagnostic Monitor Input To PCM/SPOUT Circuit Grounded | - | - | NC3 | ||
| 213 | SPOUT Circuit Open | - | PC1 | - | ||
| 214 | Cylinder Identification Circuit Failure | - | - | DR1 | ||
| 215 | Coil 1 Primary Circuit Failure | - | - | (1) | ||
| 216 | Coil 2 Primary Circuit Failure | - | - | (1) | ||
| 217 | Coil 3 Primary Circuit Failure | - | - | (1) | ||
| 218 | Loss Of Ignition Diagnostic Monitor Signal (Left Side) | - | - | (1) | ||
| 222 | Loss Of Ignition Diagnostic Monitor Signal (Right Side) | - | - | (1) | ||
| 223 | Loss Of Dual Plug Inhibit Control | - | - | (1) | ||
| 224 | Coil 1/2/3/4 Primary Circuit Failure | - | - | (1) | ||
| 225 | Knock Not Sensed During Dynamic Response Test | - | DG1 | - | ||
| 226 | Ignition Diagnostic Monitor Signal Not Received | NC2 | - | - | ||
| 232 | Coil 1/2/3/4 Primary Circuit Failure | - | - | (1) | ||
| 238 | Coil 4 Primary Circuit Failure | - | - | (1) | ||
| 244 | Coil 4 Primary Circuit Failure | - | DR1 | - | ||
| 326 | Exhaust Gas Recirculation Circuit (PFE) Voltage Lower Than Expected | - | DL20 | DL90 | ||
| 327 | Exhaust Gas Recirculation Circuit (PFE) Below Minimum Voltage | DL1 | DL21 | DL90 | ||
| 328 | Exhaust Gas Recirculation Closed Valve Voltage Lower Than Expected | DN25 | DN25 | DN90 | ||
| 332 | Insufficient Exhaust Gas Recirculation Flow | - | DL30 | DL90 | ||
| 334 | Exhaust Gas Recirculation Closed Valve Voltage Higher Than Expected | DN20 | DN20 | DN115 | ||
| 335 | Exhaust Gas Recirculation Sensor Voltage Higher/Lower Than Expected | DL80 | - | - | ||
| 336 | Exhaust Pressure High/Exhaust Gas Recirculation (PFE) Circuit Voltage Higher Than Expected | - | DL25 | DL90 | ||
| 337 | Exhaust Gas Recirculation Circuit (PFE) Above Maximum Voltage | DL5 | DL25 | DL90 | ||
| 338 | Engine Coolant Temperature Lower Than Expected | - | - | DA100 | ||
| 339 | Engine Coolant Temperature Higher Than Expected | - | - | DA101 | ||
| 341 | Octane Adjust Service Pin Open | KP1 | - | - | ||
| 411 | Cannot Control RPM During KEOR Low RPM Check | - | KE15 | - | ||
| 412 | Cannot Control RPM During KEOR High RPM Check | - | KE1 | - | ||
| 452 | Insufficient Input From Vehicle Speed Sensor To Powertrain Control Module | - | - | DP1 | ||
| 511 | Powertrain Control Module Read Only Memory Test Failure (KOEO) | Replace PCM | Replace PCM | Replace PCM | ||
| 512 | Powertrain Control Module Keep Alive Memory Test Failure | - | - | QB1 | ||
| 513 | Powertrain Control Module Internal Voltage Failure (KOEO) | QD1 | QD1 | QD1 | ||
| 519 | Power Steering Pressure Switch Circuit Open | FF1 | - | - | ||
| 521 | Power Steering Pressure Switch Circuit Did Not Change States | - | FF5 | - | ||
| 522 | Vehicle Not In PARK Or NEUTRAL During KOEO | TA1 | - | - | ||
| 525 | Vehicle In Gear / A/C On | TA1 | - | TA1 | ||
| 528 | Clutch Pedal Position Switch Circuit Failure | - | - | TA1 | ||
| 529 | Data Communication Link Or Powertrain Control Module Circuit Failure | - | - | ML25 | ||
| 532 | Cluster Control Assembly Circuit Failure | - | - | ML25 | ||
| 533 | Data Communication Link Or Electronic Instrument Cluster Circuit Failure | - | - | ML25 | ||
| 536 | Brake On/Off Circuit Failure / Not Actuated During KOER | - | FD1 | FD90 | ||
| 538 | Insufficient RPM Change Or Invalid Cylinder Balance Test | - | M1 | - | ||
| 539 | A/C On / Defrost On During KOEO | KM40 | KM40 | - | ||
| 542 | Fuel Pump Circuit Open - Powertrain Control Module To Motor Ground | J10 | - | J90 | ||
| 543 | Fuel Pump Circuit Open - Battery To Powertrain Control Module | J20 | - | J93 | ||
| 551 | Idle Air Control Circuit Failure | KT1 | - | - | ||
| 554 | Fuel Pressure Regulator Control Circuit Failure | KN1 | - | - | ||
| 556 | Fuel Pump Relay Primary Circuit Failure | J1 | - | - | ||
| 558 | Exhaust Gas Recirculation Vacuum Regulator Circuit Failure | DL11 | - | - | ||
| 559 | Air Conditioning On Relay Circuit Failure | KM60 | - | - | ||
| 563 | High Fan Control Circuit Failure | KF1 | - | - | ||
| 564 | Fan Control Circuit Failure | KF1 | - | - | ||
| 565 | Canister Purge Circuit Failure | KD6 | - | - | ||
| 566 | 3-4 Shift Solenoid Circuit Failure | TC1 | - | - | ||
| 569 | Auxiliary Canister Purge Circuit Failure | KD6 | - | - | ||
| 571 | EGR Atmospheric Pressure Supply Solenoid Circuit Failure | DD20 | - | - | ||
| 572 | EGR Vacuum Supply Solenoid Circuit Failure | DD20 | - | - | ||
| 593 | Heated Oxygen Sensor Heater Circuit Failure | H40 | - | H40 | ||
| 617 | 1-2 Shift Error | - | - | TG90 | ||
| 618 | 2-3 Shift Error | - | - | TG90 | ||
| 619 | 3-4 Shift Error | - | - | TG90 | ||
| 621 | Shift Solenoid 1 Circuit Failure | TC20 | - | TC30 | ||
| 622 | Shift Solenoid 2 Circuit Failure | TC20 | - | TC30 | ||
| 623 | Transmission Control Indicator Lamp Circuit Failure | TB3 | - | - | ||
| 624 | Electronic Pressure Control Circuit Failure | TC 10 | - | TG 90 | ||
| 625 | Electronic Pressure Control Driver Open In Powertrain Control Module | TC 10 | - | TG 90 | ||
| 626 | Coast Clutch Solenoid Circuit Failure | TC1 | - | - | ||
| 628 | Excessive Converter Clutch Slippage | - | - | TG90 | ||
| 629 | Torque Converter Clutch Solenoid Circuit Failure | TC 1 | - | TG 90 | ||
| 631 | Transmission Control Indicator Lamp Circuit Failure | TB3 | - | - | ||
| 632 | Transmission Control Switch Circuit Did Not Change States During KOER | - | TB2 | - | ||
| 634 | Transmission Range Voltage Higher/Lower Than Expected | - | - | TD10 | ||
| 636 | Transmission Fluid Temperature Higher Or Lower Than Expected | TE1 | TE1 | - | ||
| 637 | Transmission Fluid Temperature Sensor Circuit High Input/Circuit Open | TE10 | - | TE90 | ||
| 638 | Transmission Fluid Temperature Sensor Circuit Low Input/Circuit Shorted | TE20 | - | TE90 | ||
| 639 | Insufficient Input From Turbine Shaft Speed Sensor | - | TF10 | TF95 | ||
| 641 | Shift Solenoid 3 Circuit Failure | TC20 | - | - | ||
| 643 | Coast Clutch Solenoid Circuit Failure | TC20 | - | TC30 | ||
| 645 | Incorrect Gear Ratio - 1st Gear | - | - | TG90 | ||
| 646 | Incorrect Gear Ratio - 2nd Gear | - | - | TG90 | ||
| 647 | Incorrect Gear Ratio - 3rd Gear | - | - | TG90 | ||
| 648 | Incorrect Gear Ratio - 4th Gear | - | - | TG90 | ||
| 649 | Electronic Pressure Control Higher Or Lower Than Expected | - | - | TG90 | ||
| 651 | Electronic Pressure Control Circuit Failure | - | - | TG90 | ||
| 652 | Torque Converter Clutch Solenoid Circuit Failure | TC1 | - | - | ||
| 654 | Transmission Range Sensor Indicating Not In PARK During Self-Test | TD1 | - | - | ||
| 656 | Torque Converter Clutch Slippage | - | - | TG90 | ||
| 657 | Transmission Overtemperature | - | - | TE100 | ||
| 659 | High Vehicle Speed In Park | - | - | TG90 | ||
| 667 | Transmission Range Circuit Voltage Below Minimum Voltage | TD 1 | TD 1 | TG 90 | ||
| 668 | Transmission Range Circuit Voltage Above Maximum Voltage | TD 1 | TD 1 | TG 90 | ||
| 675 | Transmission Range Sensor Circuit Voltage Out Of Range | - | - | TG90 | ||
| 998 | Hard Fault Present - FMEM Mode | TC 10 | (2)FMEN | (2)FMEN | ||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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