How to read and understand OBD codes-wikiHow?

P1xxx codes are manufacturer specific, such as Honda, Ford, Toyota, etc. The second number tells you what subsystem the code refers to. For example, P07xx codes refer to the transmission. The last two digits are the specific problem that the code refers to. Check a code chart online for details on each specific code. Read an example code.

How to read diagnostic error codes with no special codes?

Scrunch up a small corner, and put it in the hole in the fuse box (by your right knee – RHD) as shown below. Make sure you don’t touch it anywhere else. Next turn the ignition on (position 2). Wait for 10 seconds, and your error codes (if any) will appear on the odo: If you have no errors, it will say “DTC NO”.

What does the RPO code on a car mean?

What do RPO Codes Designate? Each RPO code is a combination of three alphanumeric characters (like Z71) that refers to a specific option or modification to the vehicle as built during production. The RPO codes identify the base model of the vehicle along with options such as paint color, engine, infotainment system, wheels, etc.

What do the last two digits of an OBD code mean?

The last two digits are the specific problem that the code refers to. Check a code chart online for details on each specific code. Read an example code. P0301 indicates a misfire condition on cylinder #1. The P indicates it’s a powertrain code, the 0 indicates that it is a generic or universal code.

What are the codes on a Harley Davidson?

Turn IGN OFF to exit diagnostic mode. If IGN is not turned off, vehicle will exit diagnostics mode when vehicle starts moving. There are three types of DTCs: current, pending and historic. The odometer self-diagnostics displays all codes and differentiates between current and historic with a letter designator.

What does the p code mean on a check engine light?

Step 2: Determine the meaning of the letter. There are four possible letters that can be displayed in the first section. The letter “P” indicates powertrain-related codes such as those involving the engine or the transmission and their sensors. Typically, “P” codes are the only ones that will illuminate the Check Engine Light.

Can a code reader turn off the Check Engine light?

With a code reader you can easily clear codes and turn off the “check engine” light, but you will however not be able to check for readiness and may fail to get a sticker in case your vehicle finds itself at the DMV’s office.

What should the voltage be on a Class 2 serial pin?

With the Ignition on, the voltage on class 2 serial data pin should be 5V or fluctuating between 3.5V and 5.0V, If open, PCM cannot transmit data to the scan tool. Connect positive DMM lead to DLC Battery + terminal Connect negative DMM lead to battery ground terminal

What to do if the OBD II scanner doesn’t communicate with the vehicle?

What to do if the OBD II scanner doesn’t communicate with the vehicle. TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. Do not connect to the body or chassis ground but to the battery terminal directly.

Can you run the engine while reading the codes?

In the two links you provided in comments, it states to plug in your code reader, turn the ignition on, but don’t start the engine, then read the codes. It’s not telling you “cannot run the engine” while reading the codes, it’s just saying not to do it to read the codes at first.

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