Obd1 codes 1993 taurus 3.0 keeps comming up with 538 code. i have changed egr valve, egr solenoid valve/regulator,iac,tps,t'stat, coolant temp. sensor,dpfe sensor,

1988-98 Chevy and GMC C/K 1500/2500/3500 Pickup Trucks ...

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OBD-I trouble code chart ; 32, Exhaust Gas Recirculation (EGR) failure, Check the vacuum source and all vacuum lines. Check the system electrical connectors at ...

OBD1 Codes - Trouble Code List & Reading (GM) - Mechanic ...

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Jan 15, 2022 - In this guide, we will go through everything you have to know about OBD1 Trouble Codes. Learn to read the trouble codes without a scanner ...
‎OBD1 Trouble Code List · ‎OBD1 Connector Wirings Pinout

GM OBD/OBD2 Codes - TroubleCodes.net

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GM Specific Codes ; 64. MAP sensor voltage low; RH side O2 sensor lean ; 65, RH side O2 sensor rich ; 66. 3-2 Control solenoid circuit fault(4L60-E); A/C pressure ...

GM OBD I Trouble Code Chart - RepairPal

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Jul 5, 2018 - GM OBD I Trouble Code Chart ; Code 15, Engine coolant temp sensor error (low temp indicated) ; Code 16, System voltage too low ; Code 17, Camshaft position sensor ...
‎Code 12 · ‎Code 32 · ‎Code 42
GM OBD Trouble Code 12
Sept 5, 2012
GM OBD Trouble Code 32
Sept 5, 2012
GM OBD Trouble Code 33
Sept 5, 2012
GM OBD Trouble Code 22
Sept 17, 2012
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11 Oxygen sensor fault.
12 Airflow sensor fault.
13 Intake air temp sensor fault.
14 Throttle position sensor (TPS) fault.
15 Idle speed control (ISC) motor position sensor fault.
21 Coolant temp sensor fault.
22 Crankshaft position (CKP) sesnor fault.
23 Camshaft position (CMP) sensor fault.
24 Vehicle speed sensor (VSS) fault.
25 Barometric (BARO) pressure sensor fault.
31 Knock sensor fault.
32 MAP sensor faulty.
36 Ignition timing adjustment signal fault.
39 Oxygen (O2) sensor fault.
41 Injector(s) fault
42 Fuel pump fault.
43 EGR fault.
44 Ignition coil (cylinders #1 & #4) fault.
52 Ignition coil (cylinders #2 & #5) fault.
53 Ignition coil (cylinders #3 & #6) fault.
55 Idle air control (IAC) valve position sensor fault.
59 Rear Oxygen (O2) sesnor fault.
61 Transaxle control module torque reduction signal fault.
62 Variable Induction control (VIC) valve position sensor fault.
71 Traction control (TC) vacuum valve solenoid fault.
72 Traction Control (TC) vent valve solenoid fault.

CODE 11 No distributor referene signal detected during engine cranking....Check circuit between the distributer and the pcm.

CODE 12 Problem with battery connection.Direct battery input to pcm disconnected within the last 50 ignition key-on cycles.

CODE 13** Indicates a problem with map sensor vacuum system.

CODE 14** map sensor voltage to high or to low.

CODE 15** Problem with vehicle speed sensor signal.No vss signal detected during road load conditions.

CODE 17 Engine is cold to long.Engine coolant temp stays below normal operating temp(check thermostat).

CODE 21** Problem with oxygen sensor signal circuit.Sensor voltage to computer not fluctuating.

CODE 22** Coolant sensor voltage to high or to low.Test coolant temp sensor.

CODE 23** Indicates that the air temp sensor input is below the minimum acceptable voltage or sensor input is above the acceptable voltage.

CODE 24** Throttle position sensor voltage to high or low.Test the tps.

CODE 25** Idle air control (IAC) valve circuits.A shorted condition is detected in one or more of the IAC valve circuits.Or a vacuum leak has been detected.

CODE 27 One of the injector control circuit output drivers does not respond properly to the control signal.Check the circuits.

CODE 31** Problem with canister purge solenoid circuit.

CODE 32** An open or shorted condition detected in the EGR solenoid circuit.Possible air/fuel ratio imbalance not detected during diagnosis.

CODE 33 Air conditioning clutch relay circuit.An open or shorted condition in the compressor clutch relay circuit.

CODE 34 Open or shorted condition in the speed control vacuum or vent solenoid circuits.

CODE 35 Open or shorted condition detected in the radiator fan low speed relay circuit.

CODE 37** Open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit.

CODE 41** Problem with charging system.An open or shorted condition detected in the generator Field control circuit.

CODE 42 Fuel pump relay or auto shutdown relay (ASD) control circuit indicates an open or shorted condition.

CODE 43** Multiple cylinder misfire detected.Peak primary circuit current not achieved with the maximum dwell time.

CODE 44 Battery temperature sensor volts malfunction.Problem with the battery temperature voltage circuit in the pcm.

CODE 46** Charging system volts to high>Computer indicates that the battery voltage is not properly regulated.

CODE 47** Charging system voltage to low.Battery voltage sense input below target charging voltage during engine operation and no significant change in voltage detected during active test or alternator output.

CODE 51** Oxygen sensor signal input indicates lean air/fuel ratio condition during operation.

CODE 52** Oxygen sensor signal input indicates rich air/fuel ratio during engine operation.

CODE 53** internal pcm failure detected.

CODE 54** No camshaft position sensor signal from distributer.Problem with the distributer synchronization circuit.

CODE 55 Completion of fault code display on check engine lamp.this is end of message code.

CODE 62 Unsuccessful attempt to update EMR mileage in the controller EEPROM.

CODE 63** Controller failure.EEPROM write denied.Check the PCM

P0041 Oxygen Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2
looks like your wires and melted together or a rodent has chewed them

DTC Description Possible Causes Diagnostic Aides P1504 - Idle Air Control (IAC) Circuit Malfunction This DTC is set when the PCM detects an electrical load failure on the IAC output circuit.

• IAC circuit open
• VPWR to IAC solenoid open
• IAC circuit short to PWR
• IAC circuit short to GND
• Damaged IAC valve
• Damaged PCM

• The IAC solenoid resistance is from 6 to 13 ohms.
  • IAC valve stuck open
  • Vacuum leaks
  • Failed EVAP system
  • Damaged PCM
• The IAC solenoid resistance is from 6 to 13 ohms.

P1507 - Idle Air Control (IAC) Underspeed Error This DTC is set when the PCM detects engine idle speed that is less than the desired rpm.

• IAC circuit open
• IAC circuit short to PWR
• VPWR to IAC solenoid open
• Air inlet is plugged
• Damaged IAC solenoid
• Damaged PCM

• The IAC solenoid resistance is from 6 to 13 ohms
• Disconnect IAC valve and look for no change in engine rpm as an indication of a stuck or damaged valve

P1131 - Lack of HO2S-11 Switch, Sensor Indicates Lean A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

• Electrical:
  • Short to VPWR in harness or HO2S
  • Water in harness connector
  • Open/Shorted HO2S circuit
  • Corrosion or poor mating terminals and wiring
  • Damaged HO2S
  • Damaged PCM
• Fuel System:
  • Excessive fuel pressure
  • Leaking/contaminated fuel injectors
  • Leaking fuel pressure regulator
  • Low fuel pressure or running out of fuel
  • Vapor recovery system
• Induction System:
  • Air leaks after the MAF
  • Vacuum Leaks
  • PCV system
  • Improperly seated engine oil dipstick
• EGR System:
  • Leaking gasket
  • Stuck EGR valve
  • Leaking diaphragm or EVR
• Base Engine:
  • Oil overfill
  • Cam timing
  • Cylinder compression
  • Exhaust leaks before or near the HO2S(s)

A fuel control HO2S PID switching across 0.45 volt from 0.2 to 0.9 volt indicates a normal switching HO2S.

Hello! Here is a list of Trouble codes for a 1993 Mazda...I would strongly suggest that you not purchase the vehicle...A long serious list...Looks like a faulty Electronic Control Module (ECM)...

Guru..........Saailer




02 Crank Position Sensor 2 (NE 2 Signal). 03 Crank Position Sensor 1 (G Signal). 04 Crank Position Sensor 1 (NE 1 Signal). 05 Knock Sensor. 08 Air Flow Sensor. 09 Engine Coolant Temperature Sensor. 10 Intake Air Temp. Sensor (Air Flow Sensor). 12 Throttle Position Sensor. 14 Barometric Absolute Press. Sensor. 15
and/or
23 Heated Oxygen Sensor (Inactivation). 16 EGR Function Sensor. 17
and/or
24 Closed Loop System. 25 Pressure Regulator Control Solenoid Valve. 26 Purge Control Solenoid Valve. 28 EGR Vacuum Solenoid Valve. 29 EGR Vent Solenoid Valve. 34 Idle Air Control Valve. 41 VRIS 1 Solenoid Valve. 46 VRIS 2 Solenoid Valve. 67 Coolant Fan Relay No. 1. 69 Engine Coolant Temperature Sensor (Fan). To Extract DTCs:

1. Warm engine to operating temperature and turn ignition "OFF."
2. Install jumper wire between TEN and GND terminals of data link connector.
3. Turn the ignition switch to the ON position.
4. If MIL illuminates for 3 seconds, goes off, and stays off, no codes are present.
5. If MIL illuminates, then starts flashing, record codes.
6. When all codes have been recorded, remove jumper wire.

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Diagnostic Trouble Codes OBD1
Mazda 02 Crank Position Sensor (NE Signal). 03 Cam Position Sensor (SGC Signal). 05 Knock Sensor. 08 Air Flow Sensor. 09 Engine Coolant Temperature Sensor. 10 Intake Air Temp. Sensor (Air Flow Sensor). 12 Throttle Position Sensor. 14 Barometric Absolute Press. Sensor. 15
and/or
23 Heated Oxygen Sensor (Inactivation). 16 EGR Function Sensor. 25 Pressure Regulator Control Solenoid Valve. 26 Purge Control Solenoid Valve. 28 EGR Vacuum Solenoid Valve. 29 EGR Vent Solenoid Valve. 34 Idle Air Control Valve. 41 VRIS 1 Solenoid Valve. 46 VRIS 2 Solenoid Valve.

CODE 12- NO DISTRIBUTOR REFERENCE PULSES ECM. CODE 13- OXYGEN CIRCUIT. CODE 14- COOLANT SENSOR HIGH TEMP CODE 15- COOLANT SENSOR LOW TEMP. CODE 21 - THROTTLE POSITION SENSOR VOLTAGE HIGH.CODE 22 - THROTTLE POSITION SENSOR VOLTAGE LOW.CODE - 23 MIXTURE CONTROL SOLENOID.FOR CARBURETOR ENGINE. CODE 24 -VECHICLE SPEED SENSOR. CODE 32 - BARO CIRCUIT LOW.CODE 32 - FUEL INJECTED EGR VALVE VACUUM SWITCH SHORTED TO GROUND.OR EGR VALVE SOLENOID CIRCUIT OPEN. CODE 33 - MAP SENSOR.CODE 34 - VACUUM SENSOR OR MAP SENSOR.CODE 35 - IDLE SPEED CONTROL. CODE 41 - EST CIRCUIT. CODE 42 - ELECTRONIC SPARK TIMING.CODE 43 - ELECTRONIC SPARK CONTROL UNIT. CODE 44 - LEAN EXHAUST.CODE 45 - RICH EXHAUST. CODE 51 - PROM OR MEM CAL.CODE 52 - CALPAK. CODE 53 -EGR VALVE CARBURETED ENGINE THE EGR VALVE VACUUM SENSOR HAS RECEIVED IMPROPER EGR VACUUM. CODE 54 - M C SOLENOID CARBURETED ENGINE MIXTURE CONTROL SOLENOID SHORTED OR FAULTY ECM.CODE 54- FUEL INJECTED ENGINE FUEL PUMP VOLTAGE IS LOW.CODE 55 - ECM MAKE SURE PCM GROUND CONNECTIONS ARE TIGHT.IF OKAY.REPLACE THE ECM.

The fuel pressure regulator is dumping raw fuel into the engine or the EGR valve is stuck open. Check for a fault code 32 (EGR) and test the fuel pressure for a stable or constant reading. ( Not dropping)

Engine coolant temp sensor, If you pull it you will be able to see if it is cracked.. I don't know why but the original sensors they designed the ceramic tips crack around the tip of the head.. It will make the car nearly impossible to start smoke when cranking the engine, and idle really rough racey infact. 15 dollars or so let me know if that worked for you