Engine Control System: Diagnosis Hyundai Elantra V

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 Step 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-587070-S14128737872013112200000) ).

Inspection

1. Connect the GDS on the Data Link Connector (DLC).
2. Measure the output voltage of the MAPS at idle and IG ON.

OUTPUT VOLTAGE SPECIFICATION

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-587067-S30595968512013112200000) "

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 1 and 3.
5. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-587067-S06136299602013112200000) "

Scheme 61

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the engine coolant temperature sensor connector (A).
3. Remove the sensor (B). CAUTION: Note that engine coolant may be flowed out from the water temperature control assembly when removing the sensor.
4. Supplement the engine coolant (Refer to " «COOLING SYSTEM»(ref-587053) " in EM group).

1. Check signal waveform of CKPS and CMPS using a scan tool. Specification: Refer to " «WAVEFORM»(ref-587067-S06187236962013112200000) "

Scheme 62

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the crankshaft position sensor connector (A) and remove the sensor after removing the installation bolt.

1. Check the signal waveform of the CMPS and CKPS using the GDS. Specification: Refer to " «WAVEFORM»(ref-587067-S06187236962013112200000) "

1. Turn the ignition switch OFF.
2. Disconnect the HO2S connector.
3. Measure resistance between the HO2S terminals 2 and 5 [B1/S1]. Measure resistance between the HO2S terminals 3 and 4 [B1/S2].
4. Check that the resistance is within the specification. Specification: Refer to " «SPECIFICATION»(ref-587067-S20207622792013112200000) "

1. Connect the GDS 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-587067-S08791535432013112200000) "

1. Connect the GDS on the Data Link Connector (DLC).
2. Measure the output voltage of the FTPS. Specification: Refer to " «SPECIFICATION»(ref-587067-S08742254132013112200000) "

Scheme 63

Scheme 64

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Remove the rear seat (Refer to " «SEAT»(ref-587071) " in BD group).
3. Remove the fuel pump service cover (A).
4. Disconnect the fuel tank pressure sensor connector (A).
5. Remove the fuel tank pressure sensor (B) after releasing the hooks vertically.

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-587067-S03305886522013112200000) "

Scheme 65

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Release the residual pressure in fuel line (Refer to " «RELEASE RESIDUAL PRESSURE IN FUEL LINE»(ref-587072-S23682169582013112200000) " in this group). CAUTION: When removing the fuel pump relay, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.
3. Disconnect the injector connector (A).
4. Disconnect the fuel feed tube quick-connector (B).
5. Remove the installation bolt (C), and then remove the delivery pipe & injector assembly from the engine.
6. Remove the fixing clip (A), and then seperate the injector from the delivery pipe.

Scheme 66

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-587067-S15682556142013112200000) "

Scheme 67

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the purge control solenoid valve connector (A).
3. Disconnect the vapor hoses (B) from the purge control solenoid valve.
4. Remove the valve (C) from the surge tank after pulling it.

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-587067-S13236443492013112200000) "

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-587067-S08750748912013112200000) "

Scheme 68

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the variable intake solenoid valve connector (A).
3. Disconnect the vacuum hoses (B) from the valve.
4. Remove the installation nut, and then remove the valve from the surge tank.

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-587067-S36145004462013112200000) "
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

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Lift the vehicle.
3. Disconnect the canister close valve connector (A).
4. Disconnect the ventilation tube quick-connector (B) from the fuel tank air filter and canister close valve.
5. Remove the fuel tank air filter and canister close valve assembly (A) after rotating it as below.
6. Release the lever (A), and then separate the canister close valve (B) from the fuel tank air filter (C) after rotating it in the direction of the arrow in the figure.

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-587067-S33387249632013112200000) "
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-587067-S33387249632013112200000) "

Scheme 74

Scheme 75

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the VCMA connector (A).
3. Remove the VCMA (A) after removing 3 installation bolts.