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Engine Controls - System & Component Testing Hyundai Tiburon I facelift

Testing & Diagnostics 9 illustrations ~2315 words

INTRODUCTION

Note. Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens. For specific circuit diagrams to aid in diagnostic testing, see WIRING DIAGRAMS article.

Before testing separate components or systems, perform procedures in BASIC DIAGNOSTIC PROCEDURES article. Since many computer controlled and monitored components set a trouble code if they malfunction, also perform procedures in appropriate SELF-DIAGNOSTICS article.

ENGINE CONTROL MODULE (ECM)

Note. See appropriate wiring diagram in WIRING DIAGRAMS article.

Ground Circuits

  1. Turn ignition off. Check resistance between chassis ground and ECM ground terminals. See «ECM GROUND TERMINAL IDENTIFICATION»(/hyundai/tiburon/i-facelift-1999-2002/remont/testing-diagnostics/#engine-controls-system-component-testing) table. If less than 2 ohms exists, go to next step. If more than 2 ohms exists, repair wire(s) between ECM and ground.
  2. Connect voltmeter negative lead to chassis ground. Connect positive lead to each ECM ground terminal. See «ECM GROUND TERMINAL IDENTIFICATION»(/hyundai/tiburon/i-facelift-1999-2002/remont/testing-diagnostics/#engine-controls-system-component-testing) table. With engine running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection in ground circuit.
Application(1) ECM Connector Terminals No. (Wire Color)
Accent(2) 3, 51, 53, 61, 78 & 80 (BLK)
Elantra & Tiburon(2) 6, 28, 34 & 55 (BLK)
Sonata (2.4L)
C44-2 (A/T)(3) 2 & 8 (BLK)
C45-1 (M/T)(3) 13 & 26 (BLK)
C45-4 (M/T)(3) 21 (BLK)
Sonata (2.5L)
C94-1(3) 4, 5 & 6 (BLK)
C94-5(3) 5 (BLK)
(1) (Scheme 32)- (Scheme 35). (2) Ground connection is located behind left kick panel on left front pillar. (3) Ground connection is located under center console.
(2)Ground connection is located behind left kick panel on left front pillar.
(3)Ground connection is located under center console.

ECM GROUND TERMINAL IDENTIFICATION

Power Circuits

Turn ignition on. Check for battery voltage at ECM power terminals. See ECM POWER TERMINAL IDENTIFICATION table. If battery voltage is not present, check operation of engine control relay. See RELAYS.

Application(1) ECM Connector Terminals No. (Wire Color)
Accent(2) 12 (ORG/WHT), (3) 44, 45 & 63 (PNK/BLK)
Elantra(2) 26 (RED/WHT) & (3) 54 (RED/WHT)
Tiburon(2) 26 (RED/BLK) & (3) 54 (RED/WHT)
Sonata
2.4L
C44-2 (A/T)(3) 1 (PNK) & 7 (PNK)
C44-2 (A/T)(2) 26 (ORG)
C45-1 (M/T)(3) 12 (PNK) & 25 (PNK)
C45-4 (M/T)(2) 10 (ORG)
2.5L
C94-1(4) 1 (PNK)
C94-1(2) 7 (ORG)
C94-1(3) 8 (PNK) & 9 (PNK)
(1) (Scheme 31)- (Scheme 35). (2) Memory power. (3) Battery voltage from ECM control relay. (4) Power from ignition in START or ON position.
(2)Memory power.
(3)Battery voltage from ECM control relay.
(4)Power from ignition in START or ON position.

ECM POWER TERMINAL IDENTIFICATION

Scheme 31

Scheme 31
Scheme 31

Scheme 32

Scheme 32
Scheme 32

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34

Scheme 35

Scheme 35
Scheme 35

ENGINE SENSORS & SWITCHES

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in SELF-DIAGNOSTICS - INTRODUCTION article. See appropriate wiring diagram in WIRING DIAGRAMS article.

Acceleration/Rough Road Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Camshaft Position (CMP) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Crankshaft Position (CKP) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Engine Coolant Temperature (ECT) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Fuel Tank Pressure (FTP) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Heated Oxygen Sensor (HO2S)

See related DTC in appropriate SELF-DIAGNOSTICS article.

Intake Air Temperature (IAT) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Knock Sensor (KS)

See related DTC in appropriate SELF-DIAGNOSTICS article.

Manifold Absolute Pressure (MAP) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Mass Airflow (MAF) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Manifold Absolute Pressure (MAP) Sensor (Sonata 2.4L)

See related DTC in appropriate SELF-DIAGNOSTICS article.

Throttle Position (TP) Sensor

See related DTC in appropriate SELF-DIAGNOSTICS article.

Vehicle Speed Sensor (VSS)

See related DTC in appropriate SELF-DIAGNOSTICS article.

A/C Switch Circuits

Disconnect ECM harness connector. Turn ignition and A/C switches to ON position. Using a DVOM, check voltage to A/C switch at ECM connector terminals. If battery voltage is present, circuit is okay. If battery voltage is not present, repair affected circuit and retest.

Idle Position Switch (Sonata 2.4L)

Note. Idle position switch is an integral part of the Throttle Position (TP) sensor.

Turn ignition off. Disconnect TP sensor 4-pin connector. Check for continuity between TP sensor terminals No. 1 (Light Blue/Black wire) and No. 3 (Pink wire). Continuity should exist when throttle is in idle position. Continuity should not exist when throttle is not in idle position. If continuity is not as specified, ensure accelerator and cruise control cables are correctly adjusted. If cable adjustment is okay, replace TP sensor.

Power Steering Pressure Switch (Sonata 2.4L)

  1. Disconnect power steering pressure switch connector located on power steering pump. Check for continuity between switch and chassis ground. Continuity should not exist with wheels in straight-ahead position and engine idling. Continuity should exist when wheels are turned.
  2. Turn engine off. Turn ignition switch to ON position. Measure voltage between switch connector and ground. If battery voltage is present, circuit is okay. If battery voltage is not present, repair circuit between switch and ECM.

Transaxle Range (TR) Switch (A/T)

  1. TR switch is mounted to transaxle, near shift lever mechanism. Turn ignition off. Disconnect TR switch. Set TR switch to "P" position. Check for continuity between specified terminals. See «TRANSAXLE RANGE SWITCH TESTING»(/hyundai/tiburon/i-facelift-1999-2002/remont/testing-diagnostics/#engine-controls-system-component-testing) table. If continuity exists, go to next step. If continuity does not exist, ensure TR switch is adjusted correctly. Replace TR switch if adjustment is correct.
  2. Turn ignition off. Set TR switch to "N" position. Check for continuity between specified terminals. See «TRANSAXLE RANGE SWITCH TESTING»(/hyundai/tiburon/i-facelift-1999-2002/remont/testing-diagnostics/#engine-controls-system-component-testing) table. (Scheme 36)or (Scheme 37). If continuity exists, no problem is found at this time. If continuity does not exist, ensure TR switch is adjusted correctly. Replace TR switch if adjustment is correct.
Switch Position(1) Test Between Terminals No.
Accent
Park6 & 9; 7 & 8
Neutral6 & 12; 7 & 8
Elantra & Tiburon
Park3 & 9; 7 & 8
Neutral3 & 12; 7 & 8
Sonata
Park3 & 8; 9 & 10
Neutral4 & 8; 9 & 10
(1) (Scheme 36)or (Scheme 37).

TRANSAXLE RANGE SWITCH TESTING

Scheme 36

Scheme 36
Scheme 36

Scheme 37

Scheme 37
Scheme 37

RELAYS

CAUTIONWhen applying direct battery voltage, ensure voltage is applied to correct terminal using a fused jumper wire, or relay damage could result.

Note. For connector terminal identification, see appropriate wiring diagram in WIRING DIAGRAMS article.

ECM CONTROL RELAY (ACCENT, ELANTRA & TIBURON)

  1. Turn ignition off. Disconnect ECM control relay harness connector and remove relay. Relay is mounted to left front pillar, near passenger compartment relay box. Check for continuity between relay terminals No. 2 and 4. (Scheme 38) If continuity exists, go to next step. If continuity does not exist, replace ECM control relay.
  2. Using a fused jumper wire, apply battery voltage to relay terminal No. 4. Using another jumper wire, connect relay terminal No. 2 to ground. Check for continuity between relay terminals No. 1 and 5, and between terminals No. 3 and 5. If continuity exists, go to next step. If continuity does not exist, replace ECM control relay.
  3. Remove battery voltage and ground from ECM control relay. Check for continuity between relay terminals No. 1 and 5, and between terminals No. 3 and 5. If continuity does not exist, go to next step. If continuity exists, replace ECM control relay.
  4. Turn ignition off. On Accent, measure voltage between ground and ECM control relay harness connector terminals No. 4 (Orange wire) and 5 (Orange wire). On Elantra and Tiburon, measure voltage between ground and ECM control relay harness connector terminals No. 2 (White wire) and No. 5 (White wire). On all models, if battery voltage is present, go to next step. If battery voltage is not present, repair open or short in circuit between relay and ECM FUSEABLE LINK 1 (20-amp) located in engine compartment relay and fuse box. If White wire or Orange wire is okay, go to next step.
  5. Remove ECM FUSIBLE LINK 1 (20-amp) located in engine compartment relay and fuse box. Check continuity across fusible link. If continuity exists, reinstall fusible link. If continuity does not exist, replace fusible link and retest.

Scheme 38

Scheme 38
Scheme 38

ECM CONTROL RELAY (SONATA 2.4L)

Note. The ECM control relay circuit between terminals No. 6 and 8 includes a diode. Continuity should exist from terminal No. 8 to No. 6, but not from terminal No. 6 to No. 8.

  1. Turn ignition off. Locate relay behind center console, under radio. Disconnect relay harness connector and remove relay. Check for continuity between ECM control relay terminals No. 5 and 7, and between terminals No. 8 and 6. (Scheme 39) If continuity exists, go to next step. If continuity does not exist, replace ECM control relay.
  2. Using a fused jumper wire, apply battery voltage to relay terminal No. 8. Using another jumper wire, connect terminal No. 6 to ground. Check for continuity between relay terminals No. 2 and 4. If continuity exists, go to next step. If continuity does not exist, replace ECM control relay.
  3. Using a fused jumper wire, apply battery voltage to relay terminal No. 7. Using another jumper wire connector terminal No. 5 to ground. Check for continuity between relay terminals No. 1 and 7. If continuity exists, go to next step, relay is okay. If continuity does not exist, replace ECM control relay.
  4. Turn ignition off. Measure voltage between ground and ECM control relay harness connector terminal No. 2 (Orange wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open or short between ECM control relay and MAIN (30-amp) fuse located in engine compartment junction block.
  5. Turn ignition off. Check for an open or short between ECM relay connector terminals No. 7 (Pink wire) and No. 8 (Pink wire). If circuit is okay, go to next step. If circuit is not okay, repair open or short in Pink wires between ECM relay and engine compartment junction block.
  6. Turn ignition on. Measure voltage between ground and ECM relay connector terminal No. 7 (Pink wire) and No. 8 (Pink wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in circuit between engine compartment junction block and ignition switch.
  7. Turn ignition off. Check for an open or short between ECM relay connector terminal No. 1 (Gray wire) and fuel pump 6-pin connector terminal No. 5 (Gray wire), and check between ECM relay connector terminal No. 1 (Gray wire) and 8-pin MULTIPURPOSE CHECK connector terminal No. 7. MULTIPURPOSE CHECK connector is located under instrument panel, next to steering column. Perform repairs as necessary. If Gray wire circuits are okay, go to next step.
  8. Turn ignition off. Disconnect ECM harness connector No. 44-1 (A/T) or No. 45-1 (M/T). Check for an open or short in Green/White wire between ECM relay connector terminal No. 5 and ECM connector No. 44-1 terminal No. 20 or connector No. 45-1 terminal No. 8. (Scheme 33)or (Scheme 34). Perform repairs as necessary. If Green/White wire is okay, go to next step.
  9. Turn ignition off. Reconnect ECM harness connector. Check for an open or short in Black wire between ground connection and ECM relay connector terminal No. 6. Perform repairs as necessary, and ensure ground connection is clean and tight. If Black wire is okay, go to next step.
  10. Turn ignition on. Measure voltage between ground and INJECTOR (10-amp) fuse located in engine compartment junction block. If battery voltage is present, inspection is complete. If battery voltage is not present, repair Pink wire between ECM control relay connector terminal No. 4 and INJECTOR (10-amp) fuse.

Scheme 39

Scheme 39
Scheme 39

ECM CONTROL RELAY (SONATA 2.5L)

  1. Turn ignition off. Disconnect ECM control relay harness connector and remove relay. Relay is mounted behind center console, under radio. Check for continuity between relay terminals No. 2 and 4. (Scheme 38) If continuity exists, go to next step. If continuity does not exist, replace ECM control relay.
  2. Using a fused jumper wire, apply battery voltage to relay terminal No. 4. Using another jumper wire, connect relay terminal No. 2 to ground. Check for continuity between relay terminals No. 1 and 5. If continuity exists, go to next step. If continuity does not exist, replace ECM control relay.
  3. Remove battery voltage and ground from ECM control relay. Check for continuity between relay terminals No. 1 and 5. If continuity does not exist, go to next step. If continuity exists, replace ECM control relay.
  4. Turn ignition off. Measure voltage between ground and ECM control relay harness connector terminals No. 1 (Orange wire) and No. 4 (Orange wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in Orange wire between relay and MAIN (30-amp) fuse located in engine compartment junction block.
  5. Turn ignition off. Check for an open or short in Blue wire between ECM relay connector terminal No. 2 and ECM connector No. 94-2 terminal No. 23. (Scheme 35) Perform repairs as necessary. If Blue wire is okay, go to next step.
  6. Turn ignition off. Check for an open or short in Pink wire between ECM relay connector terminal No. 5 and ECM connector No. 94-1 terminal No. 8. Perform repairs as necessary. If Pink wire is okay, inspection is complete.

FUEL DELIVERY

Note. For fuel system pressure testing, see BASIC DIAGNOSTIC PROCEDURES article.

Fuel Pump

See BASIC DIAGNOSTIC PROCEDURES article.

Fuel Injectors

See related DTC in appropriate SELF-DIAGNOSTICS article.

IDLE CONTROL SYSTEM

Note. For Idle Speed Control (ISC) actuator testing information, see related DTC in appropriate SELF-DIAGNOSTICS article.

IGNITION SYSTEM

Note. For basic ignition checks, see BASIC DIAGNOSTIC PROCEDURES article.

EGR Valve (Sonata 2.4L)

Remove valve and inspect for carbon deposits. Ensure valve is not sticking. Apply vacuum to valve and check for leaking diaphragm. Check airflow through valve with vacuum applied.

FUEL EVAPORATION

Note. For further EVAP system testing, see related DTC in appropriate SELF-DIAGNOSTICS article.

EVAP Purge Control Solenoid Valve

  1. Turn ignition off. Disconnect EVAP purge control solenoid valve harness connector. Measure resistance between solenoid valve terminals. If resistance is 20-32 ohms at 68°F (20°C), go to next step. If resistance is not as specified, replace EVAP purge control solenoid valve.
  2. Disconnect Black, Red-stripped vacuum hose. Connect a vacuum pump, and apply vacuum. Using a fused jumper wire, apply battery voltage and ground to solenoid valve terminals. When solenoid valve is energized, vacuum should not hold. When solenoid valve is not energized, vacuum should hold. If EVAP purge control solenoid valve operates as specified, go to next step. Replace EVAP purge control solenoid valve if it does not operate as specified.
  3. Connect a vacuum gauge to Black, Red-stripped vacuum hose. Start engine and allow to idle at a temperature of 176-203°F (80-95°C). Increase and decrease engine speed while monitoring manifold vacuum. As engine speed changes, vacuum should stay constant. If no vacuum is detected or very little, clean vacuum port and/or replace Black, Red-stripped vacuum hose.

Two-Way Valve

Apply vacuum to inlet side and then to outlet side of two-way valve. Vacuum applied to inlet side of two-way valve should hold. Vacuum applied to outlet side of two-way valve should not hold. Replace two-way valve if operation is not as specified.

PCV Valve

Disconnect vacuum hose from PCV valve. Remove PCV valve from valve cover and reconnect to vacuum hose. Start engine and allow to idle. Cover open end of PCV valve with finger, and check for intake vacuum. If intake vacuum is felt, PCV valve is opening properly. If intake vacuum is not felt, clean PCV valve, vacuum hose and/or replace as necessary.