Engine Control System Components: Diagnosis Hyundai Equus II

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, 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 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 «BASIC INSPECTION PROCEDURE»(ref-417730-S38022104232011083000000) ).

Inspection

1. Check the mass air flow sensor visually. Mounting direction of the sensor Any contamination, corrosion or damage of connector Air cleaner's clogging or wet Sensor cylinder's deforming or blocking by any foreign material
2. Check any leakage on intake system.

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Scheme 86

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the mass air flow sensor connector (A) and remove the installation bolt (B).
3. Remove the intake air hose (A) and the resonator (B). (Refer to " «INTAKE MANIFOLD»(ref-417717-S12050135302011083000000) " in EM group.)
4. Remove the installation clamp (C), and then remove the sensor from the air cleaner assembly.

1. Turn the ignition switch OFF.
2. Disconnect the IATS connector.
3. Measure resistance between the IATS terminals 4 and 5.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-417731-S05234890662011083000000) Section.

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Scheme 88

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the intake air temperature sensor connector (A) and remove the installation bolt (B).
3. Remove the intake air hose (A) and the resonator (B). (Refer to " «INTAKE MANIFOLD»(ref-417717-S12050135302011083000000) " in EM group.)
4. Remove the installation clamp (C), and then remove the sensor from the air cleaner assembly.

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 2.
5. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-417731-S22442320932011083000000) Section.

Scheme 89

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Remove the cooling fan. (Refer to " «COOLING SYSTEM»(ref-417716) " in EM group.)
3. Disconnect the engine coolant temperature sensor connector and remove the engine coolant temperature sensor (A). 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-417716) " in EM group).

1. Check the signal waveform of the CMPS and CKPS using a scantool. Specification: Refer to " «WAVE FORM»(ref-417731-S11386997512011083000000) "

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1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the crankshaft position sensor connector (A).
3. Remove the installation bolt (B), and then vertically remove the sensor from the transaxle housing.

1. Check the signal waveform of the CMPS and CKPS using a GDS. Specification: Refer to " «WAVE FORM»(ref-417731-S18321592612011083000000) "

1. Check signal waveform of HO2S using a scantool. Specification: Refer to " «WAVE FORM»(ref-417731-S35492677582011083000000) "
2. Turn the ignition switch OFF.
3. Disconnect the HO2S connector.
4. Measure resistance between the HO2S heater terminals 3 and 4.
5. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-417731-S35492677582011083000000) Section.

1. Connect a scantool 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-417731-S14763961982011083000000) Section.

1. Connect a scantool on the Data Link Connector (DLC).
2. Measure the output voltage of the FTPS. Specification: Refer to «SPECIFICATION»(ref-417731-S14186014222011083000000) Section.

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-417731-S07852757062011083000000) Section.

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Scheme 96

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-417732-S19334651072011083000000) " 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 purge control solenoid valve connector (A) and the vapor hose (B).
4. Remove the fuel tube (C) after removing the nut.
5. Remove the purge control solenoid valve after removing the installation bolt.
6. Remove the delivery pipe hose (B) from the bracket (C) after removing the wiring protector (A).
7. Disconnect the injector connector (A).
8. Remove the delivery pipe assembly (B) from the intake manifold after removing 4 bolts.
9. Remove the fixing clip (A), and then separate the injector (B) from the delivery pipe.

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-417731-S06259121762011083000000) Section.

Scheme 97

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Disconnect the purge control solenoid valve connector (A) and the vapor hose (B).
3. Remove the purge control solenoid valve (C) after removing the installation bolt.

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-417731-S20427245072011083000000) Section.

1. Turn the ignition switch OFF.
2. Disconnect the VIS valve connector.
3. Measure resistance between the VIS valve terminals 1 and 2.
4. Check that the resistance is within the specification. Specification: Refer to «SPECIFICATION»(ref-417731-S08518919472011083000000) Section.

Scheme 98

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 bracket installation bolt (C).
5. Remove the installation nut (D), 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-417731-S02678355322011083000000) Section.
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

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