Chapter 11 OBD Part 2

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List 4 common conditions necessary for a drive cycle to successfully run:

1. @ cold start, IAT & ECT close in temperature 2. Fuel within range (15% to 85%) 3. Specified range of time 4 to 12 minutes 4. @ stop & idle for certain time

Mode 6 can help diagnose faults by following these three steps:

1. How system failed 2. what is required to pass monitor 3. What triggered the fault

List 5 of 10 Freeze Frame Data

1. Load 2. RPM 3. Fuel Trim 4. Fuel Pressure 5. Vehicle Speed

List 4 reasons a continuous monitor may be stopped.

1. Misfire 2. 2 trip fault 3. fuel too rich/lean 4. Freeze Frame activaated

Describe the 4 major codes:

1. P Codes = Powertrain/engines 2. B Codes = Body/Interior 3. C Codes = Chassis/suspension 4. U Codes = Communication module

OBD2 has been on all passenger vehicles in the U.S. since ____.

1996

The computer will automatically clear a DTC if there are no additional detected faults after _____.

40 Consecutive warm up cycles

What is a Trip?

A Key on condition to run particular tests

DTC P0302 is a _____.

A generic DTC

P0100 code are from system in:

Air Metering & Fuel

What are pending codes and how do they differ from a fault code?

Component not in range, yet has not met the conditions to set a DTC

What condition exist if the MIL light is steady?

Fault related to emissions

P0200 codes are from system in:

Fuel Injector

Which is a continuous monitor?

Fuel system monitor

P0302: What does the second digit represent?

Generic or Manufacturer specific

Global (generic) OBD2 contains some data in what format?

Hexidecimal

P0300 codes are from what system?

Ignition System or Misfire

What condition exist if the MIL light is flashing?

Misfire or fuel control system fault that can damage CAT

List the description of the 9 modes of operation:

Mode 1: Parameter Identification Display Mode 2: Freeze Frame Data Mode 3: DTC's Mode 4: Clear Codes Mode 5: O2 Sensor Monitor Mode 6: Non Continuous Monitoring Mode 7: Continuously Monitoring Mode 8: Bidirectional Control Mode 9: Module Identification

What is the enabling criteria for an EGR monitor?

No start when @ idle

The comprehensive component monitor checks comuter controlled devices for _____.

Opens Shorts to ground Rationality

The PCM can check the inputs and outputs electrically by detecting _____, _____, and _____.

Opens, shorts, and grounds

By looking at the way DTC's are formatted, which DTC could indicate that the gas cap is loose or defective?

P0442

What is the enabling criteria for an O2 sensor monitor?

Reaching operating temperature and entered close loop

Rationality Test are usually with PCM _____ and Functionality test are related to PCM _____.

Sensor Inputs PCM Outputs

P0302: What does the fourth and fifth digits represent?

Specific Fault Designation

P0302: What does the third digit represent?

The Specific System

A pending code is a set when a fault is detected on_____.

The first fault of a two trip failure

An ignition misfire or fuel mixture problem is an example of what type of DTC?

Type A

Emission related Codes are of what type?

Type A & or Type B

What is a drive cycle?

Vehicle driven @ certain speeds during certain times that allow monitors to run

A freeze frame is generated on an OBD2 vehicle _____.

When a type A or B diagnostic trouble code is set

What is Freeze Frame Data?

snapshot or still of all data @ time of emissions DTC is set

How long will the fault code remain in memory?

up until 40 warm up cycles with temperatures above 160⁰F

What website has information on each manufacture's service information website that provide mode 6 data?

www.NASTF.com


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