Gasoline Engine Control System: Diagnosis Kia Sorento I рестайлинг

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.

ECM PROBLEM INSPECTION PROCEDURE

1. TEST ECM GROUND CIRCUIT: Measure resistance between ECM and chassis ground using the backside of ECM harness connector as ECM side check point. If the problem is found, repair it. Specification (Resistance): 1ohms or less
2. TEST ECM CONNECTOR: Disconnect the ECM connector and visually check the ground terminals on ECM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.
3. If problem is not found in Step 1 and 2 , the ECM could be faulty. If so, replace the ECM with a new one, and then check the vehicle again. If the vehicle operates normally then the problem was likely with the PCM.
4. RE-TEST THE ORIGINAL ECM : Install the original ECM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original ECM with a new one. If problem does not occur, this is intermittent problem. Refer to INTERMITTENT PROBLEM PROCEDURE in «BASIC INSPECTION PROCEDURE»(ref-278797-S06235183652008020400000) .

COMPONENT INSPECTION

THROTTLE POSITION SENSOR (TPS)

1. Connect a scan tool on the Data Link Connector (DLC).
2. Start engine and check output voltages of TPS 1 and 2 at C.T and W.O.T. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .
3. Turn ignition switch OFF and disconnect the scan tool from the DLC.
4. Disconnect ETC module connector and measure resistance between ETC module terminals 4 and 8 (TPS 1).
5. Measure resistance between ETC module terminals 1 and 5 (TPS 2). Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) . ETC MOTOR
6. Disconnect ETC module connector and measure resistance between ETC module terminals 2 and 3. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

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 55

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.

SPECIFICATION

RESISTANCE SPECIFICATIONS

1. Turn ignition switch OFF.
2. Disconnect IATS connector.
3. Measure resistance between IATS terminals 4 and 5.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

Scheme 56

Manifold Absolute Pressure Sensor (MAPS) is speed-density type sensor and is installed on the surge tank. This MAPS senses absolute pressure in surge tank and transfers this analog signal proportional to the pressure to the PCM. The PCM calculates the intake air quantity and engine speed based on this signal. This MAPS consists of piezo-electric element and hybrid IC that amplifies the element output signal. The element is silicon diaphragm type and adapts pressure sensitive variable resistor effect of semi-conductor. 100% vacuum and the manifold pressure applies to both sides of it respectively. That is, this sensor outputs the silicon variation proportional to pressure change by voltage.

SPECIFICATION

VOLTAGE SPECIFICATIONS

Scheme 57

1. Connect a scan tool on Diagnostic Link Connector (DLC).
2. Check MAPS output voltage at idle and IG ON. VOLTAGE SPECIFICATIONS Condition Output Voltage (V) IG ON 3.9-4.1V Idle 0.8-1.6V

1. Turn ignition switch OFF.
2. Disconnect ECTS connector
3. Remove the ECTS.
4. After immersing the thermistor of the sensor into engine coolant, measure resistance between ECTS terminals 1 and 3.
5. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

1. Check signal waveform of CMPS and CKPS using a scan tool. Specification: Refer to " «WAVEFORM»(ref-278809-S21546923192008020400000) "

1. Check signal waveform of CMPS and CKPS using a scan tool. Specification: Refer to " «WAVEFORM»(ref-278809-S35114844372008020400000) "

1. Check signal waveform of HO2S using a scan tool. Specification: Refer to " «WAVEFORM»(ref-278809-S02109587372008020400000) ".
2. Disconnect the HO2S connector.
3. Measure resistance between HO2S heater terminals 3 and 4.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

1. Turn ignition switch OFF.
2. Disconnect injector connector.
3. Measure resistance between injector terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

1. Turn ignition switch OFF.
2. Disconnect OCV connector.
3. Measure resistance between OCV terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

1. Turn ignition switch OFF.
2. Disconnect OTS connector
3. Remove the OTS.
4. After immersing the thermistor of the sensor into water (or engine coolant), measure resistance between OTS terminals 1 and 2.
5. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

1. Turn ignition switch OFF.
2. Disconnect PCSV connector.
3. Measure resistance between PCSV terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

1. Turn ignition switch OFF.
2. Disconnect VIS Valve connector.
3. Measure resistance between VIS Valve terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

Scheme 58

Accelerator Position Sensor (APS) is installed on the accelerator pedal module and detects the rotation angle of the accelerator pedal. The APS is one of the most important sensors in engine control system, so it consists of the two sensors which adapt individual sensor power and ground line. The second sensor monitors the first sensor and its output voltage is half of the first one. If the ratio of the sensor 1 and 2 is out of the range (approximately 1/2), the diagnostic system judges that it is abnormal.

SPECIFICATION

ITEM SPECIFICATIONS

ITEM SPECIFICATIONS

Scheme 59

1. Connect a scan tool to the Diagnosis Link Connector (DLC).
2. Start engine and check output voltages of APS 1 and 2 at C.T and W.O.T. Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .
3. Turn ignition switch OFF and disconnect the scan tool from the DLC.
4. Disconnect APS connector and measure resistance between APS terminals 5 and 6 (APS 1). Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .
5. Disconnect APS connector and measure resistance between APS terminals 3 and 4 (APS 2). Specification: Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000) .

Scheme 60

The evaporative emission control system prevents hydrocarbon vapors from escaping from the fuel tank into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Fuel Tank Pressure Sensor (FTPS) is installed on fuel pump assembly and is an integral part of the evaporative monitoring system. The ECM monitors the FTPS signal to detect vacuum decay and excess vacuum. The FTPS measures the difference between the air pressure inside the fuel tank and atmospheric air pressure to check the purge control solenoid valve operation and for leak detection in the evaporative emission control system by monitoring pressure and vacuum levels in the fuel tank during the purge control solenoid valve operating cycles.

SPECIFICATION

ITEM SPECIFICATIONS

Scheme 61

1. Connect a scan tool on Diagnosis connector (DLC).
2. Check FTPS output voltage at idle. VOLTAGE SPECIFICATIONS Condition Output (V) Idle Approx. 2.5V

1. Turn ignition switch OFF.
2. Disconnect CCV connector.
3. Measure resistance between CCV terminals 1 and 2.
4. Check that the resistance is within the specification. SPECIFICATION : Refer to «SPECIFICATION»(ref-278809-S34604076172008020400000)