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Engine Controls - Basic Diagnostic Procedures: Other Hyundai Tiburon I рестайлинг

Testing & Diagnostics 10 illustrations ~2932 words

Compression

WARNINGDO NOT use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate engine oiling system.

Note. Before checking engine compression pressure ensure engine oil level is correct. Ensure starter motor and battery are operating properly.

Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See engine analyzer manual for specific instructions. Start engine and allow to operate until coolant temperature is 176-205°F (80-96°C). Check engine compression with engine at specified cranking speed, all spark plugs removed and throttle wide open.

Application(1) Specification
Compression Ratio
Accent (1.5L)10.0:1
Elantra (2.0L)10.3:1
Sonata
2.4L10.0:1
2.5L10.0:1
Tiburon (2.0L)10.3:1
Compression Pressure
Accent (1.5L)220-234 psi (15-16 kg/cm 2 )
Elantra (2.0L)199-213 psi (14-15 kg/cm 2 )
Sonata
2.4L178 psi (12 kg/cm 2 )
2.5L149-170 psi (10-12 kg/cm 2 )
Tiburon (2.0L)199-213 psi (14-15 kg/cm 2 )
Maximum Variation Between Cylinders
All Models14 psi (1 kg/cm 2 )
(1) Checked with engine coolant temperature at 176-205°F (80-96°C) and engine speed at 250-400 RPM.
(1)Checked with engine coolant temperature at 176-205°F (80-96°C) and engine speed at 250-400 RPM.

COMPRESSION SPECIFICATIONS

Exhaust System Backpressure

Exhaust system backpressure can be checked with a vacuum or pressure gauge. If using a pressure gauge, remove HO2S sensor. Connect a 1.0-5.0 psi (.07-.35 kg/cm 2 ) pressure gauge and run engine at 2500 RPM. If exhaust system backpressure is greater than 2.0 psi (.14 kg/cm 2 ), exhaust system or catalytic converter is plugged.

If using a vacuum gauge, connect vacuum gauge hose to intake manifold vacuum port and start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum gauge reading slowly drops after stabilizing, check exhaust system for restrictions.

FUEL SYSTEM

WARNINGAlways relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components.

Accent, Elantra & Tiburon

Remove rear seat and fuel pump access panel. Disconnect fuel pump harness connector. Start engine and allow to idle. After engine stalls, turn ignition off. Disconnect negative battery cable. Reconnect fuel pump harness connector. When repairs are complete and fuel lines are properly secured, reconnect negative battery cable. Using fuel pump check terminal connector, activate fuel pump and check for leaks. Repair as necessary. See FUEL PUMP TEST .

Sonata

On Sonata 2.4L, disconnect fuel pump harness connector located in trunk. On Sonata 2.5L, disconnect fuel pump harness connector located under rear seat. On all models, start engine and allow to idle. After engine stalls, turn ignition off. Disconnect negative battery cable. Reconnect fuel pump harness connector. When repairs are complete and fuel lines are properly secured reconnect negative battery cable. Using fuel pump check terminal connector, activate fuel pump and check for leaks. Repair as necessary. See FUEL PUMP TEST .

Accent

  1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3129-S04654733162000041800000). Locate fuel filter next to fuel pump. Disconnect high-pressure fuel hose from top of fuel filter. Cover hose connection using rags to avoid spraying of fuel.
  2. Using Fuel Pressure Gauge Adapter, install fuel pressure gauge to fuel filter. Tighten fuel gauge adapter bolt to 18-26 ft. lbs. (24-35 N.m).
  3. Connect negative battery cable. Using fuel pump check terminal connector, activate fuel pump and ensure no fuel leakage exists at pressure gauge or connection. See «FUEL PUMP TEST»(ref-3129-S18629616212000041800000). If no leaks are present, start engine and allow to idle.
  4. Measure and record fuel pressure at idle. See «REGULATED FUEL PRESSURE (AT IDLE)»(ref-3129-S01749612992000041800000) table. If measurements are not within specification, go to next step. If fuel pressure is as specified, go to step 7.
  5. If fuel pressure is less than specified, check for a restricted fuel filter or fuel leak on return side, caused by poor seating of fuel pressure regulator. Replace fuel filter or fuel pump assembly as necessary.
  6. If fuel pressure is greater than specified, check for sticking fuel pressure regulator or a restricted or bent fuel return hose or pipe. Repair or replace fuel hoses and/or pipe, or replace fuel pump assembly as necessary.
  7. If fuel pressures are as specified, stop engine and check gauge for a decrease in fuel pressure. Fuel pressure should hold for approximately 5 minutes. If fuel pressure does not hold for approximately 5 minutes go to next step.
  8. If fuel pressure decreases slowly after engine is stopped, check for a leaking injector. If fuel pressure decreases immediately after engine is stopped, fuel pump check valve is not working. Replace fuel injector or fuel pump as necessary. After repairs are completed, check for fuel leaks, and recheck fuel pressure.
  9. After testing is completed, release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3129-S04654733162000041800000). Disconnect fuel pressure gauge from adapter bolt. Ensure hose connection is covered by a shop towel to prevent fuel spray. Remove adapter bolt, install NEW "O" ring, and replace with original bolt. Apply battery voltage to fuel pump drive connector terminal. see scheme 1 Check for fuel leaks.

Elantra & Tiburon

  1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3129-S04654733162000041800000). Locate fuel filter in left rear corner of engine compartment, below brake master cylinder. Remove quick-tie securing fuel lines together and disconnect master cylinder reservoir connector. Disconnect high-pressure fuel hose from top of fuel filter. Cover hose connection using rags to avoid spraying of fuel.
  2. Using Fuel Pressure Gauge Adapter, install fuel pressure gauge to fuel filter. (Scheme 2) Tighten fuel gauge adapter bolt to 18-26 ft. lbs. (24-35 N.m). Connect negative battery cable.
  3. Using fuel pump check terminal connector, activate fuel pump and ensure no fuel leakage exists at pressure gauge or connection. See «FUEL PUMP TEST»(ref-3129-S18629616212000041800000). If no leaks are present, start engine and allow to idle.
  4. Disconnect vacuum hose from fuel pressure regulator, and plug hose end. Measure and record fuel pressure at idle. Reconnect vacuum hose, and again measure and record fuel pressure. See «REGULATED FUEL PRESSURE (AT IDLE)»(ref-3129-S01749612992000041800000) table. If measurements are not within specification, go to next step. If measurements are okay, go to step 8.
  5. If fuel pressure is less than specified, check for a restricted fuel filter, fuel pressure regulator leaking fuel to fuel return side, leaking in-tank fuel pick-up hose, or low fuel pump discharge pressure. Replace fuel filter, fuel pressure regulator, pick-up hose or fuel pump as necessary. Recheck fuel pressure.
  6. If fuel pressure is greater than specified, check for sticking fuel pressure regulator or a restricted or bent fuel return hose or pipe. Repair or replace fuel hoses and/or pipe, or replace fuel pressure regulator.
  7. If fuel pressure does not change when regulator vacuum hose is connected and disconnected, check for restricted or damaged vacuum hose and/or manifold vacuum port, or fuel pressure regulator sticking or poorly seated valve.
  8. If fuel pressures are as specified, stop engine and check gauge for a decrease in fuel pressure. Fuel pressure should hold for approximately 5 minutes. If fuel pressure decreases slowly after engine is stopped, check for a leaking injector. Replace as necessary. If fuel pressure decreases immediately after engine is stopped, check valve inside fuel pump is not working. Replace fuel pump. After repairs are completed, check for fuel leaks, and recheck fuel pressure.
  9. After testing is completed, release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3129-S04654733162000041800000). Disconnect fuel pressure gauge from adapter bolt. Ensure hose connection is covered by a shop towel to prevent fuel spray. Remove adapter bolt, install NEW "O" ring, and replace with original bolt. Apply battery voltage to fuel pump drive connector terminal. see scheme 1 Check for fuel leaks.
  1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3129-S04654733162000041800000). Disconnect high-pressure fuel hose from fuel delivery pipe. Cover hose connection using rags to avoid spraying of fuel.
  2. Using Fuel Pressure Gauge Adapter (09353-38000), install fuel pressure gauge to fuel delivery pipe. (Scheme 3) Tighten fuel gauge adapter bolt to 18-26 ft. lbs. (24-35 N.m). Connect negative battery cable.
  3. Using fuel pump check terminal connector, activate fuel pump and ensure no fuel leakage exists at pressure gauge or connection. See «FUEL PUMP TEST»(ref-3129-S18629616212000041800000). If no leaks are present, start engine and allow to idle.
  4. Disconnect vacuum hose from fuel pressure regulator, and plug hose end. Measure and record fuel pressure at idle. Reconnect vacuum hose, and again measure and record fuel pressure. See «REGULATED FUEL PRESSURE (AT IDLE)»(ref-3129-S01749612992000041800000) table. If measurements are not within specification, go to next step. If measurements are okay, go to step 8.
  5. If fuel pressure is less than specified, check for a restricted fuel filter, fuel pressure regulator leaking fuel to fuel return side, leaking in-tank fuel pick-up hose, or low fuel pump discharge pressure. Replace fuel filter, fuel pressure regulator, pick-up hose or fuel pump as necessary. Recheck fuel pressure.
  6. If fuel pressure is greater than specified, check for sticking fuel pressure regulator or a restricted or bent fuel return hose or pipe. Repair or replace fuel hoses and/or pipe, or replace fuel pressure regulator.
  7. If fuel pressure does not change when regulator vacuum hose is connected and disconnected, check for restricted or damaged vacuum hose and/or manifold vacuum port, or fuel pressure regulator sticking or poorly seated valve.
  8. If fuel pressures are as specified, stop engine and check for a decrease in fuel pressure gauge. Fuel pressure should hold for approximately 5 minutes. If fuel pressure decreases slowly after engine is stopped, check for a leaking injector. Replace as necessary. If fuel pressure decreases immediately after engine is stopped, check valve inside fuel pump is not working. Replace fuel pump. After repairs are completed, check for fuel leaks, and recheck fuel pressure.
  9. After testing is completed, release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3129-S04654733162000041800000). Disconnect fuel pressure gauge from adapter bolt. Ensure hose connection is covered by a shop towel to prevent fuel spray. Remove adapter bolt, install NEW "O" ring, and replace with original bolt. Apply battery voltage to fuel pump drive connector terminal. see scheme 1 Check for fuel leaks.
ApplicationW/ Vacuum - psi (kg/cm 2 )W/O Vacuum - psi (kg/cm 2 )
Accent (1.5L)(1)(1)
Elantra & Tiburon (2.0L)37.0 (2.60)43.5 (3.06)
Sonata (2.4L & 2.5L)37.0 (2.60)46.4-49.3 (3.26-3.48)
(1) On Accent, the fuel pressure regulator is mechanically controlled and is an integral part of the fuel pump assembly. Regulated fuel pressure at idle should be 49.8 psi (3.5 kg/cm 2 ).
(1)On Accent, the fuel pressure regulator is mechanically controlled and is an integral part of the fuel pump assembly. Regulated fuel pressure at idle should be 49.8 psi (3.5 kg/cm 2 ).

REGULATED FUEL PRESSURE (AT IDLE)

Scheme 2

Scheme 2
Scheme 2
  1. Remove ECM control relay located under left side of instrument panel, near fuse panel. Using a fused jumper wire, apply battery voltage to relay terminal No. 4. (Scheme 4) Using another jumper wire, ground relay terminal No. 2.
  2. When relay is energized, check for continuity between relay terminals No. 1 and No. 5. Continuity should exist until voltage is disconnected. If continuity is as specified, go to next step.
  3. Using a fused jumper wire, apply battery voltage to relay terminal No. 4. Using another jumper wire, ground relay terminal No. 2. When relay is energized, check for continuity between terminals No. 3 and No. 5. Continuity should exist until voltage is disconnected. Replace relay if continuity is not as specified.

Sonata (2.4L)

  1. Remove ECM control relay which is mounted to right side of instrument panel center support, under radio. Using a fused jumper wire, apply battery voltage to relay terminal No. 8. Using another jumper wire, ground relay terminal No. 6. (Scheme 5)
  2. With relay energized, check for continuity between relay terminals No. 2 and 4. Continuity should exist until voltage is disconnected. If continuity exists, go to next step. Replace relay if continuity does not exist.
  3. Using a fused jumper wire, apply battery voltage to relay terminal No. 7. Using another jumper wire, ground relay terminal No. 5. When relay is energized, check for continuity between relay terminals No. 1 and 7. Continuity should exist until voltage is disconnected. Replace relay if continuity does not exist.

Sonata (2.5L)

  1. Remove ECM control relay which is mounted to right side of instrument panel center support, under radio. Using a fused jumper wire, apply battery voltage to relay terminal No. 4. Using another jumper wire, ground relay terminal No. 2. (Scheme 4)
  2. With relay energized, check for continuity between relay terminals No. 1 and 5. Continuity should exist until voltage is disconnected. Replace relay if continuity does not exist.

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

IGNITION CHECKS

Note. When troubleshooting components and component control circuits, see appropriate wiring diagram in WIRING DIAGRAMS article.

Spark (Spark Plug)

Connect spark plug to a high tension cable. Ensure spark plug gap is 0.039-0.043" (1.0-1.1 mm). Ground outer spark plug electrode (main body of spark plug), and crank engine. Spark should occur in discharge gap between electrodes.

Ignition Coil Power Circuit (Accent)

Turn ignition off. Disconnect both ignition coil 2-pin "A" connectors. Turn ignition on. Measure voltage between ground and "A" connector terminal No. 2. (Scheme 6) Battery voltage should exist. If battery voltage does not exist, repair circuit between coil and ignition switch.

Ignition Coil Power Circuit (Elantra & Tiburon)

Turn ignition off. Disconnect ignition coil 3-pin connector. Turn ignition on. Measure voltage between connector terminal No. 1 and ground. (Scheme 7) Battery voltage should exist. If battery voltage does not exist, repair circuit between coil and ignition switch.

Ignition Coil Power Circuit (Sonata 2.4L)

  1. Turn ignition off. Disconnect suspect coil 3-pin harness connector. Turn ignition on. Measure voltage between ground and coil 3-pin connector terminal No. 1 (Tan/Black wire). (Scheme 8) If battery voltage does not exist, turn ignition off and go to next step.
  2. Disconnect ignition failure sensor 4-pin connector. Turn ignition on. Measure voltage between ground and sensor harness connector terminal No. 4 (Pink/Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair circuit between ignition failure sensor and ignition switch.
  3. Check for continuity between ignition failure sensor terminals No. 1 and 2. If continuity exists, repair circuit between ignition failure sensor and suspect coil. If continuity does not exist, replace ignition failure sensor.

Ignition Coil Power Circuit (Sonata 2.5L)

Turn ignition off. Disconnect ignition coil 4-pin connector. Turn ignition on. Measure voltage between connector terminal No. 3 (Pink/Black wire) and ground. (Scheme 9) Battery voltage should exist. If battery voltage does not exist, repair circuit between coil and ignition switch.

Ignition Coil Ground Circuit (Accent)

Turn ignition off. Disconnect both ignition coil 2-pin "A" connectors. Disconnect ECM 81-pin harness connector. Check for an open or short between ground and "A" connector terminal No. 1. Check for an open or short between ground and ECM 81-pin connector terminals No. 2 and No. 5. (Scheme 6)and (Scheme 10). Repair circuits as necessary.

Ignition Coil Ground Circuit (Elantra & Tiburon)

Turn ignition off. Disconnect ECM 88-pin connector and ignition coil 3-pin connector. Check for an open or short between ECM connector terminal No. 25 and coil connector terminal No. 2, and between ECM connector terminal No. 52 and coil connector terminal No. 3. Repair circuits as necessary.

Ignition Coil Ground Circuit (Sonata 2.4L)

Turn ignition off. Check for continuity between ground and suspect coil 3-pin connector terminal No. 2 (Black wire). Continuity should exist. If continuity does not exist, repair circuit between suspect coil and ground connection located on middle of firewall in engine compartment.

Ignition Coil Ground Circuit (Sonata 2.5L)

Turn ignition off. Disconnect ECM 9-pin 94-5 connector and ignition coil 4-pin connector. (Scheme 9)and see scheme 12. Check for an open or short in ground circuits between specified coil 4-pin harness connector terminals and ECM 94-5 connector terminals. See COIL GROUND CIRCUIT TESTING (SONATA 2.5L) table. Repair as necessary.

ECM 9-Pin 94-5 Connector Terminal No. (Wire Color)Coil 4-Pin Connector Terminal No.
1 (RED/BLK) (1)4
2 (ORG/BLK) (2)1
3 (YEL/WHT) (3)2
5 (BLK)(4) Ground Connection
(1) Controls cylinders No. 3 and 6. (2) Controls cylinders No. 2 and 5. (3) Controls cylinders No. 1 and 4. (4) Located behind center support bracket.
(1)Controls cylinders No. 3 and 6.
(2)Controls cylinders No. 2 and 5.
(3)Controls cylinders No. 1 and 4.
(4)Located behind center support bracket.

COIL GROUND CIRCUIT TESTING (SONATA 2.5L)

Ignition Coil Resistance (Accent)

  1. Turn ignition off. Disconnect both ignition coil 2-pin "A" connectors. Measure primary coil resistance between "A" connector terminals No. 1 and 2. One "A" connector is for cylinders No. 1 and 4, the other is for cylinders No. 2 and 3. (Scheme 6) Replace coil if resistance is not as specified. See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table.
  2. To check secondary coil resistance, disconnect spark plug wires. Measure resistance between high-voltage coil terminals No. 1 and 4, and between coil towers No. 2 and 3. (Scheme 7) See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table. Replace coil if resistance is not as specified.

Ignition Coil Resistance (Elantra & Tiburon)

  1. Disconnect ignition coil 3-pin connector. Measure primary coil resistance for cylinders No. 2 and 3 between coil connector terminals No. 1 and 3. Measure primary coil resistance for cylinders No. 1 and 4 between connector terminals No. 2 and 3. (Scheme 7) Replace coil if resistance is not as specified. See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table.
  2. To check secondary coil resistance, disconnect spark plug wires. Measure resistance between high-voltage coil terminals No. 1 and 4, and between coil towers No. 2 and 3. See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table. Replace coil if resistance is not as specified.

Ignition Coil Resistance (Sonata 2.4L)

  1. Turn ignition off. To check primary coil resistance, disconnect suspect coil 3-pin connector. Using a jumper wire, connect coil power transistor terminal No. 2 to power supply ground. Using a fused jumper wire, connect a 3-volt power supply to coil power transistor terminal No. 1. (Scheme 8)
  2. Measure resistance between coil power transistor terminals No. 2 and 3. See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table. Continuity should not exist when coil power transistor is not energized. If resistance is as specified, go to next step.
  3. To check secondary coil resistance, disconnect 3-volt power supply and ground from coil power transistor. Measure secondary coil resistance between high voltage terminals. (Scheme 8) See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table. Replace coil if resistance is not as specified.

Ignition Coil Resistance (Sonata 2.5L)

  1. Disconnect ignition coil 4-pin connector. Measure primary coil resistance for cylinders No. 1 and 4 between connector terminals No. 2 and 3. Measure primary coil resistance for cylinders No. 2 and 5 between connector terminals No. 1 and 3. Measure primary coil resistance for cylinders No. 3 and 6 between coil connector terminals No. 3 and 4. (Scheme 9) Replace coil if resistance is not as specified. See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table.
  2. To check secondary coil resistance, disconnect spark plug wires. Measure resistance between high-voltage coil terminals No. 1 and 4, between terminals No. 2 and 5, and between terminals No. 3 and 6. (Scheme 9) See «DIS IGNITION COIL RESISTANCE»(ref-3129-S38561081112000041800000) table. Replace coil if resistance is not as specified.
ApplicationPrimarySecondary
Accent, Elantra & Tiburon0.45-0.5510,300-13,900
Sonata
2.4L(1) 0.7820,000
2.5L0.67-0.8111,305-15,295
(1) Resistance value is with coil power transistor energized using a 3-volt power supply and ground connected to terminals No. 1 and 2. (Scheme 8)
(1)Resistance value is with coil power transistor energized using a 3-volt power supply and ground connected to terminals No. 1 and 2. (Scheme 8)

DIS IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

IDLE SPEED & IGNITION TIMING

Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ON-VEHICLE ADJUSTMENTS article.

SUMMARY

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to appropriate SELF-DIAGNOSTICS article. If no hard codes are found in self-diagnostics, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

More articles — Engine Controls - Basic Diagnostic Procedures