repairs:codes
Diagnostic Trouble Codes
Getting codes from ECU.
- Turn ignition switch to ON position.
- Use a screwdriver to turn ECM diagnostic mode selector on ECU fully clockwise.
- Wait for inspection lights to flash 3 times sequentially. (Mode 3/Self Diagnostic)
- As soon as inspection light flashes Mode 3, turn mode selector off. (fully counterclockwise)
- Count number of flashes and record them. Red first for Tens digit and Green for ones digit.
For example a faulty Mass Airflow Meter is code 12 or Red 1 flash and Green 2 flashes
DTC Codes
Code | Definition | Location |
---|---|---|
11 | Crank Angle Sensor | Optical Sensor in base of distributor |
12 | Mass Airflow Meter | Large sensor in intake piping |
13 | Cylinder Head Temperature Sensor | Front of driver side cylinder head behind timing cover |
14 | Car/Vehicle Speed Sensor | On transmission |
21 | Ignition Signal | Ignition coil, Power Transistor, or Crank Angle Sensor |
22 | Fuel Pump Control | Fuel pump - tank / Fuel pump relay - passenger side behind rear interior panel |
23 | Throttle Position Sensor | Side of throttle body on driver side |
24 | Neutral Safety Switch | On transmission |
31 | AC/Load | Driver Side of intake plenum |
32 | Start Signal | No signal from key switch to ecu |
34 | Knock Sensor | Right side of block |
41 | Fuel Temperature Sensor | Side of fuel pressure regulator |
44 | Normal Operation | no codes |
Clearing Codes
Codes can be cleared by disconnecting the battery or removing power from ECU.
After the engine has been started 50 times any codes will be deleted.
repairs/codes.txt · Last modified: 2022/08/04 17:38 by 127.0.0.1