Home ReviewsRefund
Home/Kia/Optima/Kia Optima II (2005-2008)/Repair manual/Testing & Diagnostics/Engine Control System (Fuel System (G6EA - Gsl 2.7L)): Diag…
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Control System (Fuel System (G6EA - Gsl 2.7L)): Diagnosis Kia Optima II

Testing & Diagnostics 1 illustration ~361 words

10) DTC FORMAT

  1. Diagnostic Trouble Code (SAE J2012)
  2. DTCs used in OBD-II vehicles will begin with a letter and are followed by four numbers.

The letter of the beginning of the DTC identifies the function of the monitored device that has failed. A "P" indicates a powertrain device, "C" indicates a chassis device. "B" is for body device and "U" indicates a network or data link code. The first number indicates if the code is generic (common to all manufacturers) or if it is manufacturer specific. A "0" & "2" indicates generic, "1" indicates manufacturer-specific. The second number indicates the system that is affected with a number between 1 and 7.

The following is a list showing what numbers are assigned to each system.

  1. Fuel and air metering
  2. Fuel and air metering (injector circuit malfunction only)
  3. Ignition system or misfire
  4. Auxiliary emission controls
  5. Vehicle speed controls and idle control system
  6. Computer output circuits
  7. Transmission

The last two numbers of the DTC indicates the component or section of the system where the fault is located.

COMPONENT INSPECTION

  1. Check the MAFS visually. Mounting direction correct. Any contamination, corrosion or damage on connector. Air cleaner's clogging or wet. MAFS cylinder's deforming or blocking by any foreign material.
  2. Check any leakage on intake system and intercooler system.

Scheme 81

Scheme 81: FUNCTION AND OPERATION PRINCIPLE
Scheme 81: FUNCTION AND OPERATION PRINCIPLE

Intake Air Temperature Sensor (IATS) is installed inside the Mass Air Flow Sensor (MAFS) and detects the intake air temperature. To calculate precise air quantity, correction of the air temperature is needed because air density varies according to the temperature. So the PCM uses not only MAFS signal but also IATS signal. This sensor has a Negative Temperature Coefficient (NTC) and its resistance is in inverse proportion to the temperature.

  1. Connect a scan tool on Diagnosis Link Connector (DLC).
  2. Check MAPS output voltage at idle and IG ON. VOLTAGE OUTPUT CHART Condition Output Voltage (V) Idle 0.8V-1.6V IG ON 3.9V-4.1V
  1. Check signal waveform of CMPS and CKPS using a scan tool. Specification: Refer to " «WAVE FORM»(ref-266013-S16233938612007092700000) "
  1. Check signal waveform of CKPS and CMPS using a scan tool. Specification: Refer to " «WAVE FORM»(ref-266013-S28127533212007092700000) "

More articles — Engine Control System (Fuel System (G6EA - Gsl 2.7L))