Engine Control System - Non-Turbo: Diagnosis Hyundai Veloster 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 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 an intermittent problem (Refer to "Intermittent Problem Inspection Procedure" in Basic Inspection Procedure).

Inspection

1. Connect the GDS on the Data Link Connector (DLC).
2. Measure the output voltage of the MAPS at idle and IG ON. Specification: Refer to " «Specifications»(ref-586090-S29697510022013111300000) "

Scheme 102

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the manifold absolute pressure sensor connector (A).
3. Remove the installation bolt (B), and then remove the sensor from the surge tank.

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 " «Specifications»(ref-586090-S13094729212013111300000) "

1. Turn the ignition switch OFF.
2. Remove the ECTS (Refer to " «REMOVAL»(ref-586090-S16157840202013111300000) ").
3. After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 3 and 4.
4. Check that the resistance is within the specification. Specification: Refer to " «Specifications»(ref-586090-S13368509742013111300000) "

Scheme 103

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the engine coolant temperature sensor connector (A).
3. Supplement the engine coolant (Refer to " «Cooling System»(ref-586076-S01231659152013111300000) ").

1. Check signal waveform of CKPS and CMPS using a GDS. Specification: Refer to " «Waveform»(ref-586090-S34135262892013111300000) "

Scheme 104

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

1. Check the signal waveform of the CMPS and CKPS using the GDS. Specification: Refer to " «Wave Form»(ref-586090-S34682563172013111300000) "

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 " «Specifications»(ref-586090-S10758100422013111300000) "

Scheme 105

Scheme 106

Scheme 107

Scheme 108

Scheme 109

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the connector (A), and then remove the sensor (B). NOTE: Note that the SST (Part No.: 09392-2H100) is useful when removing the heated oxygen sensor. [Bank 1/Sensor 1] [Bank 1/Sensor 2]

1. Connect the GDS on the Data Link Connector (DLC).
2. Measure the output voltage of the RPS at idle and various engine speed. Condition Output Voltage (V) Idle Approx. 1.2 1, 500 rpm 2.2 ~ 2.5 6, 300 rpm Approx. 3.0

Scheme 110

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-586091-S03403273892013111300000) "). 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. Remove the intake manifold (Refer to " «Intake And Exhaust System»(ref-586078-S07773687562013111300000) ").
4. Disconnect the rail pressure sensor connector (A), and then remove the sensor (B) from the delivery pipe.

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 " «Specifications»(ref-586090-S19995894562013111300000) "

1. Connect the GDS on the Data Link Connector (DLC).
2. Measure the output voltage of the FTPS. Specification: Refer to " «Specifications»(ref-586090-S24220450402013111300000) "

Scheme 111

Scheme 112

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Remove the rear seat (Refer to " «Seat»(ref-586112-S20433992482013111300000) ").
3. Remove the fuel pump service cover (A).
4. Disconnect the fuel tank pressure sensor connector.
5. Remove the fuel tank pressure sensor (A) 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 " «Specifications»(ref-586090-S07750405942013111300000) "

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 " «Specifications»(ref-586090-S13465244132013111300000) "

Scheme 113

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 after removing the bolt (C).

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 " «Specifications»(ref-586090-S36438862272013111300000) "

Scheme 114

Scheme 115

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the CVVT oil control valve connector (A).
3. Remove the installation bolt (B), and then remove the valve from the engine. [Bank 1/Intake] [Bank 1/Exhaust]

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 " «Specifications»(ref-586090-S08560308892013111300000) "

Scheme 116

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 bolt, and then remove the valve (C) from the surge tank.

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the fuel pressure regulator valve connector.
3. Measure resistance between the fuel pressure regulator valve terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to " «Specifications»(ref-586090-S10301941722013111300000) "

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 " «Specifications»(ref-586090-S25907374672013111300000) "
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 117

Scheme 118

Scheme 119

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 hose (B) from the fuel tank air filter and canister close valve.
5. Remove the fuel tank air filter assembly after removing bolts (C).
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.