Honda OBD1 16 Pins DIY Diagnostic Without OBD Scanner

HOW TO READ OBD1 CODES ON HONDA 16 PIN DLC

How to read codes

LEASE NOTE:If after following the instructions below the Check Engine Light does not flash it either means there are no fault codes or there is a connection error. To test connection, remove the TPS and run the engine then recheck codes.

• If possible run the engine to bring the oxygen sensor up to operating temperature then switch the engine off.
• Connect the terminals using your own jumper wire,  , as shown in the diagram.
  
•  Turn ignition ON.
•  If the Check Engine Light (CEL) flashes, read codes as described in the Code Format Description below.
• Press the continue button to enter the code numbers and get the code description.

Code Format

Read Code Format

• Each code is made up of two series of flashes.
• The long flashes indicate the ‘tens’ digits.
•  The short flashes indicate the ‘ones’ digits.
• A long pause separates each code sequence.
• Code Format Diagram shows code No. 12.
•  If nolongflashes are observed then the code is a straight count of short flashes. i.e. 4 flashes = code 4.

Erasing codes

• Trouble codes may also be erased by disconnecting battery lead.

WARNING: Disconnecting BACK UP fuse or battery may erase memory from electronic units (e.g. radio, clock)