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OBDII ERROR CODES - WHAT NOW?
Your "Check Engine" or "Service Engine
Soon" light came on. Now what? The car is still running? Is it serious?
We are trying to develop lists that can help folks out there. Here's
a favorite of mine. Your vehicle might vary, so always check with your
vehicles service manual before acting upon this information.
CODE READER
You can buy an OBD II Code reader unit
here or from your local parts store. The best value we have seen is this
one from Harbor Freight Tools.
 |
ITEM 46030-0VGA$49.99 (Sometimes on sale for $39.99)
Note: Even if you don't do your own repairs, owning a reader is a great idea - it can help you learn the "quality" of your chosen repair department. Knowing what your car's computer knows is always a good idea. The code scanner I use is an Actron CP9125. Some Autoparts store (Autozone & Oreilly) offer FREE
code reading too!
WARNING Working on automobiles can injure or kill you. We bear no responsibility if you or anyone else gets hurt (physically or monetarily) following any advice or information offered here or any other page we host. We are just trying to help out.
GOT
THE CODES - NOW WHAT?
So you read a set of codes from your car. Meaningless letters and numbers! What do they mean? Here's some
information - we just thought it would be useful to have them all in one
place. Don't know what EGR and ECM, etc. mean? Look Here
Remember - just because a code is set, does NOT always mean that the device it points to is bad! Faulty wiring (wires broken, shorted or burned) can cause the same effect and so can a bad computer box (ecm Electronic Control Module) It is a shame, but a perfectly working car can be brought to a halt with a "dead" engine by a simple fuse in a box somewhere. (Makes you long for the good old days - one vacuum line and one wire to the distributor and coil - sigh).
So what fails on cars these
days? Well, Oxygen Sensors wear out and need replacing or the emissions
and economy go down the tubes. The EGR (Exhaust Gas Recirculation Valve) clog
up with carbon and stop working - more emission NOX problems. By sending some
of the exhaust gases back into the intake, combustion temperatures are lowered
to reduce oxides of Nitrogen NOX - Smog in other words.
Various other sensors like MAP sensors in the intake air, TPS Throttle
Position Sensors, Knock Sensors, cam sensors - they can all go on the
fritz. EGRs are my favorite as you get to hit them with a hammer to
clean them.
On Board Diagnostic Codes
OBDII OBD11 OBD II DTC ERROR CODES
|
CODE |
Definition |
| P0102 | Mass Air Flow circuit Low Input This is usually in the air intake. |
| P0103 | Mass Air Flow circuit High Input. |
| P0106 | EGR Manifold Pressure Sensor Input Signal is out of Self-Test Range. EGR Valve = robs you of power! |
| P0107 | EGR/Barometric Signal circuit is less than self-test minimum. |
| P0108 | EGR Barometric Pressure Sensor Input Signal is out of self test Range. |
| P0112 | Intake Air Temperature circuit Low Input. |
| P0113 | Intake Air Temperature circuit High Input. |
| P0117 | Engine Coolant Temperature circuit Low Input. |
| P0118 | Engine Coolant Temperature circuit High Input. |
| P0121 | In-range operating throttle position sensor circuit failure. |
| P0122 | Throttle Position Sensor circuit Low Input. |
| P0123 | Throttle Position Sensor circuit High Input. |
| P0125 | Insufficient Coolant Temperature to enter Closed Loop. |
| P0126 | Insufficient Coolant Temperature for Stable Operation. |
| P0128 | Temperature of Coolant not correct - Maybe Engine/Radiator Temperature Sensor is bad or Thermostat is stuck (bad) |
| P0131 | Upstr Heated Oxygen Sensor circuit out of range - Bank No. 1. |
| P0132 | Upstr Heated Oxygen Sensor circuit Voltage High - Bank No. 1. |
| P0133 | Upstr Heated Oxygen Sensor circuit Slow Response - Bank No. 1. |
| P0135 | Upstr Heated Oxygen Sensor Heater circuit fault - Bank No. 1. |
| P0136 | Downstr Heated Oxygen Sensor circuit fault - Bank No. 1. |
| P0138 | Downstr Heated Oxygen Sensor circuit Voltage High - Bank No. 1. |
| P0140 | Downstr Heated Oxygen Sensor circuit Faulty - Bank No. 1. |
| P0141 | Downstr Heated Oxygen Sensor Heater circuit fault - Bank No. 1. |
| P0151 | Upstr Heated Oxygen Sensor circuit out of range - Bank No. 2. |
| P0152 | Upstr Heated Oxygen Sensor circuit Voltage High - Bank No. 2. |
| P0153 | Upstr Heated Oxygen Sensor circuit Slow Response - Bank No. 2. |
| P0155 | Upstr Heated Oxygen Sensor Heater circuit fault - Bank No. 2. |
| P0156 | Downstr Heated Oxygen Sensor circuit fault - Bank No. 2. |
| P0158 | Downstr Heated Oxygen Sensor circuit Voltage High - Bank No. 2. |
| P0160 | Downstr Heated Oxygen Sensor circuit fault - Bank No. 2. |
| P0161 | Downstr Heated Oxygen Sensor Heater circuit fault - Bank No. 2. |
| P0171 | System Too Lean - Bank No. 1. |
| P0172 | System Too Rich - Bank No. 1. |
| P0174 | System Too Lean - Bank No. 2. |
| P0175 | System Too Rich - Bank No. 2. |
| P0176 | Flexible Fuel Sensor. |
| P0180 | Engine Fuel Temperature Sensor circuit - Electrical fault. |
| P0181 | Engine Fuel Temperature Sensor circuit - Electrical fault. |
| P0182 | Engine Fuel Temperature Sensor circuit - Electrical fault. |
| P0183 | Engine Fuel Temperature Sensor circuit - Electrical fault. |
| P0187 | Engine Fuel Temperature Sensor circuit. |
| P0188 | Engine Fuel Temperature Sensor circuit. |
| P0190 | FRP Sensor Signal Low. |
| P0191 | Engine Fuel Temperature Sensor circuit. |
| P0192 | Engine Fuel Temperature Sensor circuit . |
| P0193 | Engine Fuel Temperature Sensor circuit. |
| P0222 | Throttle Position Sensor B circuit Input Low. TPS is potentiometer on throttle body |
| P0223 | Throttle Position Sensor B circuit Input High. |
| P0230 | Fuel Pump Primary circuit fault. |
| P0231 | Fuel Pump Secondary circuit Low. |
| P0232 | Fuel Pump Secondary circuit High. |
| P0300 | Random Misfire Detected. |
| P0301 | Misfire Detected - Cylinders 1-10. |
| P0302 | Misfire Detected - Cylinders 1-10. |
| P0303 | Misfire Detected - Cylinders 1-10. |
| P0304 | Misfire Detected - Cylinders 1-10. |
| P0305 | Misfire Detected - Cylinders 1-10. |
| P0306 | Misfire Detected - Cylinders 1-10. |
| P0307 | Misfire Detected - Cylinders 1-10. |
| P0308 | Misfire Detected - Cylinders 1-10. |
| P0309 | Misfire Detected - Cylinders 1-10. |
| P0310 | Misfire Detected - Cylinders 1-10. |
| P0320 | Ignition Engine Speed (PIP) Input circuit fault. |
| P0325 | A Spark Knock Occurred - Sensor Circuitry did not respond. |
| P0326 | Spark Knock has not been sensed. |
| P0330 | A Spark Knock occurred - Sensor Circuitry did not respond. |
| P0331 | Spark Knock has not been sensed. |
| P0340 | Camshaft Position Sensor circuit fault. |
| P0350 | Ignition Coil Primary circuit fault. |
| P0351 | Ignition Coil A Primary circuit fault. |
| P0352 | Ignition Coil B Primary circuit fault. |
| P0353 | Ignition Coil C Primary circuit fault. |
| P0354 | Ignition Coil D Primary circuit fault. |
| P0355 | Ignition Coil Primary circuit malfunction. |
| P0356 | Ignition Coil Primary circuit malfunction. |
| P0357 | Ignition Coil Primary circuit malfunction. |
| P0358 | Ignition Coil Primary circuit malfunction. |
| P0359 | Integrated Ignition On Plug failure. |
| P0360 | Integrated Ignition On Plug failure. |
| P0385 | Misfire Detection Sensor circuit failure. |
| P0400 | EGR Flow Faulty. |
| P0401 | Insufficient EGR Flow. Could be blocked with soot and charcoal after 1000's of miles |
| P0402 | EGR Flow Excessive at Idle. |
| P0411 | Secondary Air Injection System Flow Improper. |
| P0412 | Secondary Air Injection System Control Valve Faulty. |
| P0413 | Secondary Air Injection Solenoid did not change when activated. |
| P0414 | Secondary Air Injection Solenoid did not change when activated. |
| P0416 | Secondary Air Injection Solenoid did not change when activated. |
| P0417 | Secondary Air Injection Solenoid did not change when activated. |
| P0420 | Catalyst System Efficiency below Limit - Bank No 1. |
| P0421 | Catalyst System Efficiency below Limit - Bank No 1. |
| P0430 | Catalyst System Efficiency below Limit - Bank No 2. |
| P0431 | Catalyst System Efficiency below Limit - Bank No 2. |
| P0440 | Evaporative Emission Purge Control Solenoid Damaged. |
| P0442 | Leak in Evaporative System Detected. |
| P0443 | EVAP Canister Purge Control Solenoid or Valve Faulty. |
| P0446 | Evaporative Emission Control System Vent Control malfunction. |
| P0452 | Fuel Tank Pressure Signal circuit Input below minimum. |
| P0453 | Fuel Tank Pressure Signal circuit Input above maximum. |
| P0455 | Leak or Blockage Detected in Evaporative Emission Control System. |
| P0460 | Fuel Level Input circuit malfunction. |
| P0500 | Vehicle Speed Sensor fault. |
| P0501 | Vehicle Speed Sensor fault. |
| P0503 | Poor Vehicle Speed Sensor Performance. |
| P0505 | Idle Air Control Valve System fault. |
| P0552 | Power Steering Pressure Sensor Shorted to Power. |
| P0553 | Power Steering Pressure Sensor Shorted to Power. |
| P0602 | Replace PCM. |
| P0603 | PCM has Experienced Power Interrupt. |
| P0605 | PCM Read Only Memory Error. |
| P0703 | Brake On/Off Switch Input fault. |
| P0704 | Clutch Pedal Position Switch Input circuit fault. |
| P0705 | Transmission Range Sensor out of Self-Test Range or Shorted to Ground. |
| P0707 | Transmission Range Sensor circuit Low Input. |
| P0708 | Transmission Range Sensor circuit High Input. |
| P0712 | Transmission Fluid Temperature Sensor circuit Input Low. |
| P0713 | Transmission Fluid Temperature Sensor circuit Input High. |
| P0715 | Turbine Shaft Speed Sensor circuit fault. |
| P0720 | Output Shaft Speed Sensor circuit. |
| P0721 | Output Shaft Speed Sensor circuit. |
| P0731 | Improper Ratio for First Gear. |
| P0732 | Improper Ratio for Second Gear. |
| P0733 | Improper Ratio for Third Gear. |
| P0734 | Improper Ratio for Fourth Gear. |
| P0735 | Transmission problems. |
| P0736 | Improper Ratio for Reverse Gear. |
| P0741 | TCC System Improper Mechanical Performance. |
| P0743 | Torque Converter Clutch System Electrical failure. |
| P0746 | Electronic Pressure Control Solenoid Performance. |
| P0750 | Shift Solenoid No. 1 circuit. |
| P0751 | Shift Solenoid No. 1 Performance. |
| P0755 | Shift Solenoid No. 2 circuit. |
| P0756 | Shift Solenoid No. 2 Performance. |
| P0760 | Shift Solenoid No. 3 circuit. |
| P0761 | Shift Solenoid No. 3 Performance. |
| 70765 | Transmission system problems. |
| P0781 | 1 to 2 Shift Error. |
| P0782 | 2 to 3 Shift Error. |
| P0783 | 3 to 4 Shift Error. |
| P0784 | 4 to 5 Shift Error. |
| P1000 | OBD-II Monitor Testing Incomplete. |
| P1001 | KOER Test Cannot Be Completed. |
| P1039 | Vehicle Speed Signal Missing or Improper. |
| P1051 | Brake Switch Signal Missing or Improper. |
| P1100 | Mass Air Flow Sensor Intermittent. |
| P1101 | Mass Air Flow Sensor out of Self-Test Range. |
| P1112 | Intake Air Temperature Sensor Intermittent. |
| P1116 | Engine Coolant Temperature Sensor is out of Self-Test Range. |
| P1117 | Engine Coolant Temperature Sensor Intermittent. |
| P1120 | Throttle Position Sensor out of range. |
| P1121 | Throttle Position Sensor Inconsistent with Mass Air Flow Sensor. |
| P1124 | Throttle Position Sensor out of Self-Test Range. |
| P1125 | Throttle Position Sensor Intermittent. |
| P1127 | Heated Oxygen Sensor Heater not on During KOER Test. |
| P1128 | Heated Oxygen Sensor Signals reversed. |
| P1129 | Heated Oxygen Sensor Signals reversed. |
| P1130 | Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank No. 1. |
| P1131 | Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1. |
| P1132 | Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1. |
| P1135 | Ignition Switch Signal Missing or Improper. |
| P1137 | Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1. |
| P1138 | Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1. |
| P1150 | Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank No. 2. |
| P1151 | Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2. |
| P1152 | Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 2. |
| P1157 | Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2. |
| P1158 | Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 2. |
| P1220 | Series Throttle Control fault. |
| P1224 | Throttle Position Sensor B out of Self-Test Range. |
| P1230 | Open Power to Fuel Pump circuit. |
| P1231 | High Speed Fuel Pump Relay activated. |
| P1232 | Low Speed Fuel Pump Primary circuit failure. |
| P1233 | Fuel Pump Driver Module off-line. |
| P1234 | Fuel Pump Driver Module off-line. |
| P1235 | Fuel Pump Control out of range. |
| P1236 | Fuel Pump Control out of range. |
| P1237 | Fuel Pump Secondary circuit fault. |
| P1238 | Fuel Pump Secondary circuit fault. |
| P1250 | Lack of Power to FPRC Solenoid. |
| P1260 | Theft Detected - Engine Disabled. |
| P1270 | Engine RPM or Vehicle Speed Limiter Reached. |
| P1288 | Cylinder Head Temperature Sensor out of Self-Test Range. |
| P1289 | Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range. |
| P1290 | Cylinder Head Temperature Sensor Signal Less Than Self-Test Range. |
| P1299 | Cylinder Head Temperature Sensor Detected Engine Overheating Condition. |
| P1309 | Misfire Detection Monitor not enabled. |
| P1351 | Ignition Diagnostic Monitor circuit Input fault. |
| P1352 | Ignition Coil A - Primary circuit fault. |
| P1353 | Ignition Coil B - Primary circuit fault. |
| P1354 | Ignition Coil C - Primary circuit fault. |
| P1355 | Ignition Coil D - Primary circuit fault. |
| P1356 | Loss of Ignition Diagnostic Module Input to PCM. |
| P1358 | Ignition Diagnostic Monitor Signal out of Self-Test Range. |
| P1359 | Spark Output circuit fault. |
| P1364 | Ignition Coil Primary circuit fault. |
| P1380 | VCT Solenoid Valve circuit Short or Open. |
| P1381 | Cam Timing Advance is excessive. |
| P1383 | Cam Timing Advance is excessive. |
| P1390 | Octane Adjust out of Self-Test Range. |
| P1400 | Differential Pressure Feedback Electronic Sensor circuit Low Voltage. |
| P1401 | Differential Pressure Feedback Electronic Sensor circuit High Voltage. |
| P1403 | Differential Pressure Feedback Electronic Sensor Hoses Reversed. |
| P1405 | Differential Pressure Feedback Electronic Sensor circuit Upstream Hose. |
| P1406 | Differential Pressure Feedback Electronic Sensor circuit Downstream Hose. |
| P1407 | EGR No Flow Detected. |
| P1408 | EGR Flow out of Self-Test Range. |
| P1409 | EGR Vacuum Regulator circuit malfunction. |
| P1410 | EGR Barometric Pressure Sensor VREF Voltage. |
| P1409 | Electronic Vacuum Regulator Control circuit fault. |
| P1411 | Secondary Air is not being diverted. |
| P1413 | Secondary Air Injection System Monitor circuit Low Voltage. |
| P1414 | Secondary Air Injection System Monitor circuit High Voltage. |
| P1442 | Secondary Air Injection System Monitor circuit High Voltage. |
| P1443 | Evaporative Emission Control System - Vacuum System - Purge Control Solenoid or Purge Control Valve fault. |
| P1444 | Purge Flow Sensor circuit Input Low. |
| P1445 | Purge Flow Sensor circuit Input High. |
| P1450 | Inability of Evaporative Emission Control System to Bleed Fuel Tank. |
| P1451 | Lack of Response From Passive Anti-Theft System Module - Engine Disabled. |
| P1452 | Inability of Evaporative Emission Control System to Bleed Fuel Tank. |
| P1455 | Substantial Leak or Blockage in Evaporative Emission Control System. |
| P1460 | Wide Open Throttle Air Conditioning Cutoff circuit malfunction. |
| P1461 | Air Conditioning Pressure Sensor circuit Low Input. |
| P1462 | Air Conditioning Pressure Sensor circuit high Input. |
| P1463 | Air Conditioning Pressure Sensor Insufficient Pressure change. |
| P1464 | ACCS to PCM High During Self-Test. |
| P1469 | Low Air Conditioning Cycling Period. |
| P1473 | Fan Secondary High with Fans Off. |
| P1474 | Low Fan Control Primary circuit. |
| P1479 | High Fan Control Primary circuit. |
| P1480 | Fan Secondary Low with Low Fans On. |
| P1481 | Fan Secondary Low with High Fans On. |
| P1483 | Power to Cooling Fan Exceeded Normal Draw. |
| P1484 | Variable Load Control Module Pin 1 Open. |
| P1500 | Vehicle Speed Sensor Intermittent. |
| P1501 | Programmable Speedometer & Odometer Module/Vehicle Speed Sensor Intermittent circuit-failure. |
| P1502 | Invalid or Missing Vehicle Speed Message or Brake Data. |
| P1504 | Intake Air Control circuit malfunction. |
| P1505 | Idle Air Control System at Adaptive Clip. |
| P1506 | Idle Air Control Over Speed Error. |
| P1507 | Idle Air Control Under Speed Error. |
| P1512 | Intake Manifold Runner Control Stuck Closed. |
| P1513 | Intake Manifold Runner Control Stuck Closed. |
| P1516 | Intake Manifold Runner Control Input Error. |
| P1517 | Intake Manifold Runner Control Input Error. |
| P1518 | Intake Manifold Runner Control fault - Stuck Open. |
| P1519 | Intake Manifold Runner Control Stuck Open. |
| P1520 | Intake Manifold Runner Control circuit fault. |
| P1519 | Intake Manifold Runner Control fault - Stuck Closed. |
| P1520 | Intake Manifold Runner Control fault. |
| P1530 | Open or Short to A/C Compressor Clutch circuit. |
| P1537 | Intake Manifold Runner Control Stuck Open. |
| P1538 | Intake Manifold Runner Control Stuck Open. |
| P1539 | Power to A/C Compressor Clutch circuit Exceeded Normal Current Draw. |
| P1549 | Intake Manifold Temperature Valve Vacuum Actuator Connection. |
| P1550 | Power Steering Pressure Sensor out of Self-Test Range. |
| P1605 | PCM Keep Alive Memory Test Error. |
| P1625 | Voltage to Vehicle Load Control Module Fan circuit not detected. |
| P1626 | Voltage to Vehicle Load Control Module circuit not detected. |
| P1650 | Power Steering Pressure Switch out of Self-Test Range. |
| P1651 | Power Steering Pressure Switch Input fault. |
| P1700 | Transmission system problems. |
| P1701 | Reverse Engagement Error. |
| P1702 | Transmission system problems. |
| P1703 | Brake On/Off Switch out of Self-Test Range. |
| P1704 | Transmission system problems. |
| P1705 | Manual Lever Position Sensor out of Self-Test Range. |
| P1709 | Park or Neutral Position Switch out of Self-Test Range. |
| P1710 | Transmission system problems. |
| P1711 | Transmission Fluid Temperature Sensor out of Self-Test Range. |
| P1713 | Thru |
| P1728 | Transmission system problems. |
| P1729 | 4x4 Low Switch Error. |
| P1740 | Transmission system problems. |
| P1741 | Torque Converter Clutch Control Error. |
| P1742 | Torque Converter Clutch Solenoid Faulty. |
| P1743 | Torque Converter Clutch Solenoid Faulty. |
| P1744 | Torque Converter Clutch System Stuck in Off Position. |
| P1745 | Transmission system problems. |
| P1746 | Electronic Pressure Control Solenoid - Open circuit. |
| P1747 | Electronic Pressure Control Solenoid - Short circuit. |
| P1749 | Electronic Pressure Control Solenoid Failed Low. |
| P1751 | Shift Solenoid No. 1 Performance. |
| P1754 | Coast Clutch Solenoid circuit malfunction. |
| P1756 | Shift Solenoid No. 2 Performance. |
| P1760 | Transmission system problems. |
| P1761 | Shift Solenoid No. 3 Performance. |
| P1762 | Transmission system problems. |
| P1767 | Transmission system problems. |
| P1780 | Transmission Control Switch circuit is out of Self-Test Range. |
| P1781 | 4x4 Low Switch is out of Self-Test Range. |
| P1783 | Transmission Over-Temperature Condition. |
| P1784 | Transmission system problems. |
| P1785 | Transmission system problems. |
| P1786 | Transmission system problems. |
| P1787 | Transmission system problems. |
| P1788 | Transmission system problems. |
| P1789 | Transmission system problems. |
| P1900 | Transmission system problems. |
Another plug ....
AFC - Air Flow Control
ALDL - Assembly Line Diagnostic Link. Former name for GM (only) Data
Link Connector, the connector socket into which the scan tool plug is
inserted; sometimes used to refer to any pre-OBDII computer signals.You access
these usually by shorting 2 terminals on a diagnostic connector which is
sometimes inside the car, sometimes under the hood.
CAN - Controller Area Network
CARB - California Air Resources Board
CFI - Central Fuel Injection (a.k.a. Throttle Body Fuel
Injection TBI)
CFI - Continuous Fuel Injection
CO - Carbon Monoxide - Bad stuff.
DLC - Data Link Connector
Driving Cycle - A specific sequence of start-up, warm-up and
driving tasks that tests all OBD II functions
DTC - Diagnostic Trouble Code
ECM - Engine Control Module- usually the main in-car computer
controlling emissions and engine operation
ECT - Engine Coolant Temperature
EEC - Electronic Engine Control
EEPROM or E2PROM - Electrically Erasable Programmable
Read Only Memory- Chips in other words.
EFI - Electronic Fuel Injection A pump pressurizes the fuel onto tiny
12V valves (injectors) which squirt gas into the cylinders - replaced the
carburettor
EGR - Exhaust Gas Recirculation Robs you of horsepower, but
does clean up the air! Blockages on this valve are common causes of emission
failures.
EMR - Electronic Module Retard.
EPA - Environmental Protection Agency. Federal agency. Office of Mobile
Sources is the branch concerned with auto emissions.
ESC - Electronic Spark Control
EST - Electronic Spark Timing
DPFE - Differential Pressure Feedback EGR sensor ( On Ford
OBDII systems).
DTC - Diagnostic Trouble Code
FLI - Fuel Level Indicator
Fuel Trim - Engine computer function that keeps the air/fuel mixture as
close to the ideal 14.7:1 stoichiometric ratio as possible
HC - Hydrocarbons
HEI - High Energy Ignition - Usually built into the
distributor.
HO2S - Heated Oxygen Sensor - Another high failure
component. 3 years is about it on these. O2 Sensors fail to a point then the
computer sets a code $80 each. You may have 4 of them in your car! (the
dreaded Dodge Intrepid!)
IAT - Intake Air Temperature
ISO 9141 - International Standards Organization OBDII communication
mode, used by Chrysler and most foreign cars. One of three hardware layers
defined by OBDII
J1850PWM - (Pulse Width Modulated) SAE-established OBD II communication
standard used by Ford domestic cars and light trucks. One of three hardware
layers defined by OBD II
J1850VPW - (Variable Pulse Width Modulated) SAE-established OBD II
communication standard used by GM cars and light trucks. One of three hardware
layers defined by OBD II
J1962 - SAE-established standard for the connector plug layout used for
all OBD II scan tools
J1978 - SAE-established standard for OBD II scan tools
J1979 - SAE-established standard for diagnostic test modes
J2012 - SAE-established standard accepted by EPA as the standard test
report language for emission tests
MAF - Mass Air Flow - Really important - some cars will not run without
this and it's usually in the air cleaner!
MAP - Manifold Absolute Pressure
MAT - Manifold Air Temperature
MFG - Manufacturer
MIL - Malfunction Indicator Light. The "Check Engine Light"
on your dash."Service Engine Soon" Light also
NOX - Oxides of Nitrogen
O2 - Oxygen
OBD - On-Board Diagnostics
OBDII or OBD II - Updated On-Board Diagnostics standard
effective in cars sold in the US after 1-1-96
Parameters - Readings on scan tools representing functions measured by
OBD II and proprietary readings
PCM - Powertrain Control Module, the on-board computer that controls
engine and drive train
PCV - Positive Crankcase Ventilation
PID - Parameter ID
Proprietary Readings - Parameters shown by on-board computers which are
not required by OBD II, but included by manufacturer to assist in
trouble-shooting specific vehicles.
PTC - Pending Trouble Code
RPM - Revolutions Per Minute
SAE - Society of Automotive Engineers, professional organization that
set the standards that EPA adopted for OBD and OBD II
Scan Tool - Computer based read-out equipment to display OBD II
parameters
SES - Service Engine Soon dash light, now referred to as MIL
SFI - Sequential Fuel Injection
Stoichiometric ( Stoy'-kee-o-metric) Ratio - Theoretical perfect
combustion ratio of 1 part gas to 14.7 parts air
TBI - Throttle Body Injection
TPI - Tuned Port Injection
TPS - Throttle Position Sensor
VAC - Vacuum
VCM - Vehicle Control Module, the in-car computer that oversees engine
management, transmission operation, anti-lock brakes, and other functions not
directly related to emissions control
VIN - Vehicle Identification Number
VSS - Vehicle Speed Sensor
WOT - Wide Open Throttle
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