Engine Control System: Diagnosis Kia Forte I

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: Below 1ohms
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 Steps 1 and 2 , the ECM could be faulty. If so, make sure there were no DTC's before swapping the ECM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping ECM.
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 Inspection Procedure in «BASIC INSPECTION PROCEDURE»(ref-362210-S35006634452010060400000) ).

Inspection

1. Connect the Scan Tool on the Data Link Connector (DLC).
2. Measure the output voltage of the MAPS at idle and IG ON. Specification: Refer to " «SPECIFICATION»(ref-362211-S42535189532010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the IATS connector.
3. Measure resistance between the IATS terminals 3 and 4.
4. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S12669586572010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the ECTS connector.
3. Remove the ECTS.
4. After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 3 and 4.
5. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S03824341602010060400000) "

1. Check the signal waveform of the CMPS and CKPS using the Scan Tool. Specification: Refer to " «WAVE FORM»(ref-362211-S17344965312010060400000) "

1. Check the signal waveform of the CMPS and CKPS using the Scan Tool. Specification: Refer to " «WAVE FORM»(ref-362211-S23795516322010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the HO2S connector.
3. Measure resistance between the HO2S terminals 4 and 5 [B1/S1].
4. Measure resistance between the HO2S terminals 3 and 4 [B1/S2].
5. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S12148078662010060400000) "

1. Connect the Scan Tool on the Data Link Connector (DLC).
2. Turn the ignition switch ON.
3. Measure the output voltage of the APS 1 and 2 at C.T and W.O.T. Specification: Refer to " «SPECIFICATION»(ref-362211-S37111424312010060400000) "
4. Turn the ignition switch OFF and disconnect the Scan Tool from the DLC.
5. Disconnect the APS Connector.
6. Measure the resistance between the APS terminals 5 and 4 (APS 1). Specification: Refer to " «SPECIFICATION»(ref-362211-S37111424312010060400000) "
7. Measure the resistance between the APS terminals 6 and 2 (APS 2). Specification: Refer to " «SPECIFICATION»(ref-362211-S37111424312010060400000) "

1. Connect the Scan Tool on the Data Link Connector (DLC).
2. Measure the output voltage of the FTPS. Specification: Refer to " «SPECIFICATION»(ref-362211-S33725515312010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the injector connector.
3. Measure resistance between the injector terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S40793689302010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the PCSV connector.
3. Measure resistance between the PCSV terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S42265272492010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the OCV connector.
3. Measure resistance between the OCV terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S34439117002010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the VIS valve connector.
3. Measure resistance between VIS valve terminals 1 and 2. Specification: Refer to " «SPECIFICATION»(ref-362211-S41907096252010060400000) "

1. Turn ignition switch OFF.
2. Disconnect the VCMA connector.
3. Check that the VCMA is not stuck by foreign material.
4. Measure resistance between motor (+) and (-) control terminals of the motor.
5. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S22436712632010060400000) "
6. Measure resistance between voltage supply terminal and ground terminal of the position sensor.
7. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S22436712632010060400000) "

1. Turn the ignition switch OFF.
2. Disconnect the CCV connector.
3. Measure resistance between the CCV terminal 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-362211-S27429580452010060400000) "
5. Disconnect the vapor hose connected with the canister from the CCV.
6. Connect a vacuum pump to the nipple.
7. Ground the CCV control line and apply battery voltage to the CCV power supply line.
8. Apply vacuum and check the valve operation. Specification: Vacuum maintained