1997 Ford Escort Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code (DTC) Reference Charts

DTC REFERENCE CHART

DTC Description Circuit Test/Step: KOEO Circuit Test/Step: KOER Circuit Test/Step: CONT.
P0102 Mass Air Flow Circuit Low Input - DC/6  DC/6 
P0103 Mass Air Flow Circuit High Input DC/20  DC/20  DC/20 
P0112 Intake Air Temperature Circuit Low Input DA/20  DA/20  DA/90 
P0113 Intake Air Temperature Circuit High Input DA/10  DA/10  DA/90 
P0117 Engine Coolant Temperature Circuit Low Input DA/20  DA/20  DA/90 
P0118 Engine Coolant Temperature Circuit High Input DA/10  DA/10  DA/90 
P0121 Throttle Position Circuit Performance Problem - DH/22  DH/22 
P0122 Throttle Position Circuit Low Input DH/11  DH/11  DH/11 
P0123 Throttle Position Circuit High Input DH/8  DH/8  DH/8 
P0125 Insufficient Coolant Temperature For Closed Loop Fuel Control - - DA/100 
P0131 HO2S Sensor Circuit Out Of Range Low Voltage (HO2S-11) - - H/27 
P0133 HO2S Sensor Circuit Slow Response (HO2S-11) - - H/20 
P0135 HO2S Sensor Circuit Malfunction (HO2S-11) H/30  H/30  H/30 
P0136 HO2S Sensor Circuit Malfunction (HO2S-12) - - H/80 
P0141 HO2S Sensor Circuit Malfunction (HO2S-12) H/30  H/30  H/30 
P0151 HO2S Sensor Circuit Out Of Range Low Voltage (HO2S-21) - - H/27 
P0153 HO2S Sensor Circuit Slow Response (HO2S-21) - - H/20 
P0155 HO2S Sensor Circuit Malfunction (HO2S-11) H/30  H/30  H/30 
P0156 HO2S Sensor Circuit Malfunction (HO2S-22) - - H/80 
P0161 HO2S Sensor Circuit Malfunction (HO2S-22) H/30  H/30  H/30 
P0171 System To Lean (Bank 1) - - H/41 
P0172 System To Rich (Bank 1) - - H/41 
P0174 System To Lean (Bank 2) - - H/41 
P0175 System To Rich (Bank 2) - - H/41 
P0222 Throttle Position Sensor B Low Input HT/1  HT/1  HT/1 
P0223 Throttle Position Sensor B High Input HT/10  HT/10  HT/10 
P0230 Fuel Pump Primary Circuit Malfunction X/150  X/150  X/200 
P0231 Fuel Pump Secondary Circuit Low Input X/180  X/180  X/195 
P0232 Fuel Pump Secondary Circuit High Input X/170  X/170  X/190 
P0300 Random Misfire - HD/1  HD/1 
P0301 Misfire Detection Monitor - Cylinder No. 1 - HD/1  HD/1 
P0302 Misfire Detection Monitor - Cylinder No. 2 - HD/1  HD/1 
P0303 Misfire Detection Monitor - Cylinder No. 3 - HD/1  HD/1 
P0304 Misfire Detection Monitor - Cylinder No. 4 - HD/1  HD/1 
P0320 Ignition Engine Speed Input Circuit Malfunction - - NC/1 
P0325 Knock Sensor 1 Circuit Malfunction (Bank 1) - DG/1  DG/1 
P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1) - DG/1  DG/1 
P0330 Knock Sensor 2 Circuit Malfunction (Bank 2) - DG/1  DG/1 
P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2) - DG/1  DG/1 
P0340 Camshaft Position Sensor Circuit Malfunction - DR/1  DR/1 
P0350 Ignition Coil Primary/Secondary Circuit Malfunction - - JE/1 
P0351 Ignition Coil A Primary/Secondary Circuit Malfunction - - JE/1 
P0352 Ignition Coil B Primary/Secondary Circuit Malfunction - - JE/1 
P0401 EGR Flow Insufficient Detected - - HE/70 
P0402 EGR Flow Excessive Detected - HE/20  HE/20 
P0420 Catalyst System Efficiency Below Threshold (Bank 1) - - HF/1 
P0430 Catalyst System Efficiency Below Threshold (Bank 2) - - HF/1 
P0442 Evaporative Emission Control System Leak Detected (Small Leak) - - HX/1 
P0443 Evaporative Emission Control System Canister Purge Valve Circuit Malfunction HW/1  HW/1  HW/40 
P0446 Evaporative Emission Control System Excessive Fuel Tank Vacuum - - HX/13 
P0452 FTP Sensor Circuit Low Voltage Detected HX/22  HX/22  HX/22 
P0453 FTP Sensor Circuit High Voltage Detected HX/28  HX/28  HX/28 
P0455 Evaporative Emission Control System Leak Detected (No Purge Flow Or Large Leak) - - HX/39 
P0500 Vehicle Speed Sensor Malfunction - - DP/1 
P0501 Vehicle Speed Sensor Range/Performance - - DP/1 
P0503 Vehicle Speed Sensor Intermittent - - DP/1 
P0505 Vehicle Speed Sensor Intermittent - KE/2  -
P0603 Powertrain Control Module KAM Test Error QB/1  - -
P0605 Powertrain Control Module Read Only Memory Error Replace PCM Replace PCM Replace PCM
P0703 Brake Switch Circuit Input Malfunction - - FD/3 
P0704 Clutch Pedal Position Switch Malfunction TA/5  - TA/5 
P0705 Transmission Range Sensor Malfunction (1) - -
P0707 Transmission Range Sensor Circuit Low Voltage - - (1)
P0708 Transmission Range Sensor Circuit High Voltage - - (1)
P0712 Transmission Fluid Temperature Sensor Circuit Grounded (1) (1) (1)
P0713 Transmission Fluid Temperature Sensor Circuit Open (1) (1) (1)
P0715 Insufficient Input From Turbine Output Shaft Speed Sensor - (1) (1)
P0721 Turbine Output Shaft Speed Sensor Signal Noisy - - (1)
P0741 Torque Converter Clutch Slippage - - (1)
P0743 Torque Converter Clutch Solenoid Circuit Failure (1) (1) (1)
P0750 Shift Solenoid 1 Circuit Failure (1) (1) (1)
P0751 Shift Solenoid 1 Functional Failure - - (1)
P0755 Shift Solenoid 2 Circuit Failure (1) (1) (1)
P0756 Shift Solenoid 2 Functional Failure - - (1)
P0760 Shift Solenoid 3 Circuit Failure (1) (1) (1)
P0761 Shift Solenoid 3 Functional Failure - - (1)
P0781 1-2 Shift Error - - (1)
P0782 2-3 Shift Error - - (1)
P0783 3-4 Shift Error - - (1)
P1000 Monitor Testing Not Complete (2) (2) QC/1 
P1001 KOER Not Able To Complete, KOER Aborted - QA/1  -
P1100 Mass Air Flow Sensor Intermittent - - DC/3 
P1101 Mass Air Flow Sensor Out Of Self-Test Range DC/2  DC/1  -
P1112 Intake Air Temperature Sensor Intermittent - - DA/90 
P1116 Engine Coolant Temperature Sensor Out Of Self-Test Range DA/1  DA/1  -
P1117 Engine Coolant Temperature Sensor Intermittent - - DA/90 
P1120 Throttle Position Sensor Out Of Range Low (RATCH Too Low) DH/3  DH/3  DH/3 
P1121 Throttle Position Sensor Inconsistent With MAF Sensor - - DH/15 
P1124 Throttle Position Sensor Out Of Self-Test Range DH/1  DH/1  -
P1125 Throttle Position Sensor Intermittent - - DH/20 
P1127 Exhaust Not Warm Enough, Downstream Sensor Not Tested - H/100  -
P1128 Upstream Oxygen Sensors Swapped From Bank To Bank (HO2S-11-21) - H/110  -
P1129 Downstream Oxygen Sensors Swapped From Bank To Bank (HO2S-12-22) - H/110  -
P1130 Lack Of HO2S-11 Switch, Fuel Trim At Limit - - H/40 
P1131 Lack Of HO2S-11 Switch, Sensor Indicates Lean - H/40  H/40 
P1132 Lack Of HO2S-11 Switch, Sensor Indicates Rich - H/40  H/40 
P1137 Lack Of HO2S-12 Switch, Sensor Indicates Lean - H/80  -
P1138 Lack Of HO2S-12 Switch, Sensor Indicates Rich - H/80  -
P1150 Lack Of HO2S-21 Switch, Fuel Trim At Limit - - H/40 
P1151 Lack Of HO2S-21 Switch, Sensor Indicates Lean H/40  H/40  H/40 
P1152 Lack Of HO2S-21 Switch, Sensor Indicates Rich - H/40  H/40 
P1157 Lack Of HO2S-22 Switch, Sensor Indicates Lean - H/80  -
P1158 Lack Of HO2S-22 Switch, Sensor Indicates Rich - H/80  -
P1220 Series Throttle Control System Malfunction HT/20  HT/20  HT/20 
P1224 Throttle Position Sensor B Voltage Out Of Range HT/40  HT/40  HT/40 
P1232 Low Speed Fuel Pump Primary Circuit Malfunction X/160  X/160  X/205 
P1260 Theft Detected - Vehicle Immobilized - - QD/1 
P1270 Engine RPM/Vehicle Speed Limiter - - ND/1 
P1285 Cylinder Head Over Temperature Sensed - - DL/30 
P1288 Cylinder Head Temperature Sensor Circuit Out Of Self-Test Range DL/1  DL/1  -
P1289 Cylinder Head Temperature Sensor Circuit High Input DL/10  DL/10  DL/90 
P1290 Cylinder Head Temperature Sensor Circuit Low Input DL/20  DL/20  DL/90 
P1299 Cylinder Head Over Temperature Protection Active - - DL/100 
P1309 Misfire Monitor Disabled - - HD/40 
P1390 Octane Adjust FG/1  - -
P1400 DPF EGR Sensor Circuit Low Voltage Detected HE/1  HE/1  HE/1 
P1401 DPF EGR Sensor Circuit High Voltage Detected HE/10  HE/10  HE/10 
P1405 DPF EGR Sensor Upstream Hose Off Or Plugged - - HE/50 
P1406 DPF EGR Sensor Downstream Hose Off Or Plugged - - HE/60 
P1408 EGR Flow Out Of Self-Test Range - HE/71  -
P1409 EGR Vacuum Regulator Solenoid Circuit Malfunction HE/110  HE/110  HE/120 
P1442 Evaporative Emission Control System Leak Detected (Small Leak) - - HX/1 
P1443 Very Small Or No Purge Flow Condition - - HW/7 
P1444 Purge Flow Sensor Circuit Low Input - - HW/27 
P1445 Purge Flow Sensor Circuit High Input - - HW/33 
P1450 Evaporative Emission Control System Excessive Fuel Tank Vacuum - - HX/56 
P1451 Evaporative Emission Control System Canister Vent Solenoid Circuit Malfunction HX/65  HX/65  HX/65 
P1452 Evaporative Emission Control System Unable To Bleed Up Fuel Tank Vacuum - - HX/56 
P1455 Evaporative Emission Control System Detected Large Leak Or No Purge Flow - - HX/40 
P1460 Wide Open Throttle A/C Cutout Primary Circuit Malfunction X/105  X/105  X/120 
P1461 Air Conditioning Pressure Sensor High Voltage DS/1  DS/1  DS/1 
P1462 Air Conditioning Pressure Sensor Low Voltage DS/10  DS/10  DS/10 
P1463 Air Conditioning Pressure Sensor Insufficient Pressure Change - - DS/20 
P1464 A/C Demand Out Of Self-Test Range X/124  X/124  -
P1469 Low A/C Cycling Period - - X/115 
P1474 Low Fan Control Primary Circuit Failure X/20  X/20  X/30 
P1479 High Fan Control Primary Circuit Failure X/15  X/15  X/35 
P1500 Vehicle Speed Sensor Intermittent - - DP/25 
P1501 Vehicle Speed Sensor Out Of Self Test Range - DP/15  -
P1504 Idle Air Control Circuit Malfunction KE/2  KE/2  KE/2 
P1505 Idle Air Control System Reached Idle Air Trim Limit KE/25  KE/25  KE/25 
P1506 Idle Air Control Overspeed Error - KE/20  KE/20 
P1507 Idle Air Control Underspeed Error - KE/2  KE/2 
P1512 Intake Manifold Runner Control Malfunction (Stuck Closed) - - HU/15 
P1513 Intake Manifold Runner Control Malfunction (Stuck Closed) - - HU/15 
P1516 Intake Manifold Runner Control Input Error HU/15  - HU/15 
P1517 Intake Manifold Runner Control Input Error HU/15  - HU/15 
P1518 Intake Manifold Runner Control Malfunction (Stuck Open) HU/15  HU/15  HU/15 
P1519 Intake Manifold Runner Control Malfunction (Stuck Closed) HU/15  HU/15  HU/15 
P1520 Intake Manifold Runner Control Circuit Malfunction HU/15  HU/15  HU/15 
P1537 Intake Manifold Runner Control Malfunction (Stuck Open) HU/15  HU/15  HU/15 
P1538 Intake Manifold Runner Control Malfunction (Stuck Open) HU/15  HU/15  HU/15 
P1549 Intake Manifold Communication Control Circuit Malfunction HU/65  HU/65  HU/65 
P1550 Power Steering Pressure Sensor Malfunction - DT/1  DT/1 
P1605 Keep Alive Memory Test Failure QB/1  - -
P1650 Power Steering Pressure Switch Malfunction FF/1  FF/1  -
P1651 Power Steering Pressure Switch Signal Malfunction - FF/1  FF/1 
P1700 Transaxle Mechanical Failure - - (1)
P1703 Brake ON/OFF Circuit Failure Or Brake Switch Out Of Self-Test Range FD/2  FD/1  -
P1705
Manual Transaxle Transmission Range Sensor Not Indicating Park - TA/5  -
Automatic Transaxle Transmission Range Sensor Not Indicating Park (1) (1) -
P1709
Manual Transaxle Park/Neutral Position Switch Out Of Self-Test Range TA/5  - -
Automatic Transaxle Park/Neutral Position Switch Out Of Self-Test Range (1) - -
P1711 Transaxle Fluid Temperature Out Of Self-Test Range (1) (1) -
P1728 Transaxle Slippage - - (1)
P1731 1-2 Shift Error - - (1)
P1732 2-3 Shift Error - - (1)
P1733 3-4 Shift Error - - (1)
P1741 Excessive Torque Converter Clutch Engagement Error - - (1)
P1742 Torque Converter Clutch Solenoid Failed ON - - (1)
P1743 Torque Converter Clutch Solenoid Failed ON - - (1)
P1744 Transaxle Slippage - - (1)
P1751 Shift Solenoid 1 Functional Failure - - (1)
P1756 Shift Solenoid 2 Functional Failure - - (1)
P1761 Shift Solenoid 3 Functional Failure - - (1)
P1767 Torque Converter Clutch Solenoid Circuit Failure (1) - (1)
P1783 Transaxle Fluid Temperature Exceeded - - (1)
U1020 Module Communication Network Failure - - (3)
U1039 Module Communication Network Failure - - (3)
U1051 Module Communication Network Failure - - (3)
U1135 Module Communication Network Failure - - (3)
U1451 Module Communication Network Failure - - (3)
(1) Transmission/transaxle fault is indicated. See appropriate AUTOMATIC TRANSMISSION article.
(2) DTC P1000 indicates that OBD-II drive cycle has not been completed. Disregard this DTC in KOEO and KOER self-test and continue as directed.
(3) Module communication network failure is indicated. See appropriate MODULE COMMUNICATION NETWORK article in ACCESSORIES & EQUIPMENT.
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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.
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