Engine Controls - System & Component Testing: Other Kia Optima I рестайлинг

IDLE AIR CONTROL VALVE

Note. Only component testing procedure is covered. For Idle Air Control (IAC) valve system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Turn ignition off. Disconnect Idle Air Control (IAC) valve 3-pin harness connector for Optima & Magentis (Canadian), Rio and Spectra, and 6-pin harness connector for Sedona and Sorento. For IAC valve location see scheme 1- (Scheme 81). Check resistance between IAC valve terminals. For IAC valve terminal identification and resistance specification. (Scheme 82)and (Scheme 83). See IDLE AIR CONTROL VALVE RESISTANCES. If resistances are not as specified, replace IAC valve. For IAC valve removal and installation, see IDLE AIR CONTROL VALVE under AIR INDUCTION SYSTEM in REMOVAL & INSTALLATION article.

Scheme 81

Scheme 82

IDLE AIR CONTROL VALVE RESISTANCES

ENGINE CONTROL MODULE

Note. Engine Control Module (ECM), can also be referred to as Powertrain Control Module (PCM). For ECM location. see scheme 1- (Scheme 81).

Note. For ECM removal and installation, see ENGINE CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article.

1. Using a Digital Volt-ohmmeter (DVOM), check for ignition power, battery power, and ground at terminals listed in table by application. Turn ignition on. Check for ignition voltage at ECM power terminals. Turn ignition off. Check for battery voltage between ECM power and ground terminals. For ECM connectors and terminals identification. (Scheme 84)- (Scheme 90) and for ECM ignition power, battery power and ground terminals, see «ECM POWER & GROUND TERMINALS»(ref-151849-S16030600492003010800000) table. ECM POWER & GROUND TERMINALS Model (1) Terminals No. Optima & Magentis (Canadian) 2.4L (A/T) Battery Power B26 Ignition Power B1, B7, C7, C19, C28 Ground B2, B8, C6, C18, C27 Optima & Magentis (Canadian) 2.4L (M/T) Battery Power D10 Ignition Power A12, A25, D12 Ground A13, A26, D21 Optima & Magentis (Canadian) 2.7L Battery Power V7 Ignition Power V1, V8, V9 Ground V4, V5, V6, Z5 Rio Battery Power (B01) 7 Ignition Power (B01) 1, 8, 9, (B04) 30 (3) Ground (B01) 4, 5, 6, (B04) 5 Sedona Battery Power B26 Ignition Power B1, B7, B9, C7, C19, C28 Ground B2, B8, B17, C6, C18, C27 Sorento Battery Power B20 Ignition Power B7, B17, B19, C29 Ground B6, B9, B18, 34, 55, 72 Spectra Battery Power 12 Ignition Power 13, 45, 63, 74 (2) Ground 3, 51, 61, 74 (2), 78, 80 (1) For circuit identification, see WIRING DIAGRAMS article. For connector views (Scheme 84)- (Scheme 90). (2) ECM Terminal 74 is Ignition Power on A/T model and is Ground on M/T model. (3) On A/T model only.
2. If battery voltage is not present, check appropriate fuses. Check ECM B+ fuses, FUEL INJ fuses and IGN COILS fuses in engine or passenger compartment fuse/relay boxes. Replace fuse(s) as necessary and check for cause of blown fuse. If fuses are okay, check EGI main relay. See «RELAYS»(ref-151849-S32326634852003010800000) under RELAYS & SOLENOIDS. If relay is okay, locate and repair power open between main relay and ECM connector or ground open between body and ECM connector.

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

Scheme 89

ENGINE SENSORS & SWITCHES

Note. For 2003, Kia has discontinued the Sportage model production. Some of the figures referenced to in the following tests mention Sportage. These figures are still applicable for other models listed in figure.

BRAKE PEDAL SWITCH

Note. Only component testing procedure is covered. For brake pedal switch circuit testing, see appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS.

Optima & Magentis (Canadian) (With Cruise Control)

1. Disconnect brake pedal switch 4-pin harness connector. Locate brake pedal switch mounted at upper part of brake pedal assembly. Measure resistance between brake pedal switch terminals No. 1 and 2. (Scheme 91) With brake pedal released, there should be no continuity. With brake pedal depressed, there should be continuity. Adjust or replace switch as necessary.
2. Measure resistance between brake pedal switch terminals No. 3 and 4. With brake pedal released, there should be continuity. With brake pedal depressed, there should be no continuity. Adjust or replace switch as necessary.

Optima & Magentis (Canadian) (Without Cruise Control)

Disconnect brake pedal switch 2-pin harness connector. Locate brake pedal switch mounted at upper part of brake pedal assembly. Measure resistance between brake pedal switch terminals No. 1 and 2. (Scheme 91) With brake pedal released, there should be no continuity. With brake pedal depressed, there should be continuity. Adjust or replace switch as necessary.

Rio

Disconnect brake pedal switch 2-pin harness connector. Locate brake pedal switch mounted at upper part of brake pedal assembly. Measure resistance between brake pedal switch terminals No. 1 and 2. (Scheme 91) With brake pedal released, there should be no continuity. With brake pedal depressed, there should be continuity. Adjust or replace switch as necessary.

Sedona

1. Disconnect brake pedal switch 4-pin harness connector. Locate brake pedal switch mounted at upper part of brake pedal assembly. Measure resistance between brake pedal switch terminals No. 1 and 4 (Red wire and White wire). (Scheme 91) With brake pedal released, there should be no continuity. With brake pedal depressed, there should be continuity.
2. Measure resistance between brake pedal switch terminals No. 2 and 3 (Green/White wire and Yellow wire). With brake pedal released, there should be continuity. With brake pedal depressed, there should be no continuity. Adjust or replace switch as necessary.

Sorento

1. Disconnect brake pedal switch 4-pin harness connector. Locate brake pedal switch mounted at upper part of brake pedal assembly. Measure resistance between brake pedal switch terminals No. 1 (Blue wire) and No. 4 (White wire). (Scheme 91) With brake pedal released, there should be no continuity. With brake pedal depressed, there should be continuity.
2. Measure resistance between brake pedal switch terminals No. 2 (Blue wire) and No. 3 (Red/Black wire). With brake pedal released, there should be continuity. With brake pedal depressed, there should be no continuity. Adjust or replace switch as necessary.

Spectra (With Cruise Control)

1. Disconnect brake pedal switch 4-pin harness connector. Locate brake pedal switch mounted at upper part of brake pedal assembly. Measure resistance between brake pedal switch terminals No. 1 (Pink/Black wire) and No. 4 (Red/Black wire). (Scheme 91) With brake pedal released, there should be no continuity. With brake pedal depressed, there should be continuity.
2. Measure resistance between brake pedal switch terminals No. 2 (Blue wire) and No. 3 (Brown/Red wire). With brake pedal released, there should be continuity. With brake pedal depressed, there should be no continuity. Adjust or replace switch as necessary.

Spectra (Without Cruise Control)

Disconnect brake pedal switch 2-pin harness connector. Locate brake pedal switch mounted at upper part of brake pedal assembly. Measure resistance between brake pedal switch terminals No. 1 and 2. (Scheme 91) With brake pedal released, there should be no continuity. With brake pedal depressed, there should be continuity. Adjust or replace switch as necessary.

Scheme 90

CAMSHAFT POSITION SENSOR

Note. Only component testing procedure is covered. For Camshaft Position (CMP) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For CMP location. see scheme 1- (Scheme 81).

Note. For CMP sensor removal and installation, see CAMSHAFT POSITION SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Optima & Magentis (Canadian)

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.

Set lab scope time to 20 milliseconds and voltage to 5 volts. Start engine and allow it to reach normal operating temperature. With engine at idle, compare CMP sensor waveform to normal CMP sensor waveform. (Scheme 92) Connect lab scope as follows

1. On 2.4L (A/T) connect lab scope positive probe to ECM connector B01 terminal No. B16 (Yellow wire). (Scheme 84) Connect lab scope negative probe to ground.
2. On 2.4L (M/T) connect lab scope positive probe to ECM connector B01 terminal No. D18 (Yellow wire). (Scheme 85) Connect lab scope negative probe to ground.
3. On 2.7L, connect lab scope positive probe to ECM connector B01 terminal No. F7 (Yellow wire). (Scheme 86) Connect lab scope negative probe to ECM connector B01 terminal No. F8 (Black wire).

If waveform is erratic, replace CMP sensor.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.

Connect lab scope positive probe to ECM connector B04 terminal No. 18 (Red/Black wire). (Scheme 87) Connect lab scope negative probe to ground. Set lab scope time to 20 milliseconds and voltage to 5 volts. Start engine and allow it to reach normal operating temperature. With engine at idle, compare CMP sensor waveform to normal CMP sensor waveform. (Scheme 92) If waveform is erratic, replace CMP sensor.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.

Connect lab scope positive probe to ECM connector B01 terminal No. B16 (White/Green wire). (Scheme 88) Connect lab scope negative probe to ground. Set lab scope time to 20 milliseconds and voltage to 5 volts. Start engine and allow it to reach normal operating temperature. With engine at idle, compare CMP sensor waveform to normal CMP sensor waveform. (Scheme 92) If waveform is erratic, replace CMP sensor.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.

Connect lab scope positive probe to ECM connector B01 terminal No. B10 (Blue wire). (Scheme 89) Connect lab scope negative probe to ground. Set lab scope time to 20 milliseconds and voltage to 5 volts. Start engine and allow it to reach normal operating temperature. With engine at idle, compare CMP sensor waveform to normal CMP sensor waveform. (Scheme 92) If waveform is erratic, replace CMP sensor.

Spectra

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.

Connect lab scope positive probe to ECM connector terminal No. 79 (Blue/Red wire). (Scheme 90) Connect lab scope negative probe to ground. Set lab scope time to 20 milliseconds and voltage to 5 volts. Start engine and allow it to reach normal operating temperature. With engine at idle, compare CMP sensor waveform to normal CMP sensor waveform. (Scheme 92) If waveform is erratic, replace CMP sensor.

Scheme 91

CHASSIS ACCELERATION SENSOR - SPECTRA

Note. Only component testing procedure is covered. For Chassis Acceleration (CA) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

CA sensor is located in right side of engine compartment, behind strut tower. Turn ignition on. Backprobe and measure voltage between CA sensor 3-pin harness connector terminal No. 3 (Red/Black wire) and ground. (Scheme 93) Check for voltage spike (less than one volt) while tapping CA sensor bracket. If no voltage spike is observed, replace sensor. For CA sensor removal and installation, see CHASSIS ACCELERATION SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Scheme 92

CLUTCH PEDAL POSITION SWITCH

Note. Only component testing procedure is covered. For clutch pedal position switch circuit testing, see appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS.

Optima, Magentis (Canadian), Rio & Spectra

Disconnect Clutch Pedal Position (CPP) switch 2-pin harness connector. Locate CPP switch mounted at upper part of clutch pedal assembly. Check continuity between CPP switch terminals. (Scheme 94) With clutch pedal depressed, there should be continuity. With clutch pedal released, there should not be continuity. Adjust or replace CPP switch as necessary.

Scheme 93

CRANKSHAFT POSITION SENSOR

Note. Only component testing procedure is covered. For Crankshaft Position (CKP) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For CMP location. see scheme 1- (Scheme 81).

Note. For CKP sensor removal and installation, see CRANKSHAFT POSITION SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.

Set lab scope time to 50 milliseconds and voltage to 5 volts. Start engine and allow it to reach normal operating temperature. With engine at idle, compare CKP sensor waveform to normal CKP sensor waveform. (Scheme 95) Connect lab scope by backprobing as follows

1. On 2.4L (A/T), connect lab scope positive probe to ECM connector B01 terminal No. B5 (Yellow wire) and negative probe to ground. (Scheme 84)
2. On 2.4L (M/T), connect lab scope positive probe to ECM connector B01 terminal No. D19 (Yellow wire)and negative probe to ground. (Scheme 85)
3. On 2.7L, connect lab scope positive probe to ECM connector B01 terminal No. M8 (Yellow wire) and negative probe to ECM connector B01 terminal No. M21 (Black/White wire). (Scheme 86)

If waveform is erratic, replace CKP sensor.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source, as this will affect waveform.

Backprobing connect lab scope positive probe to ECM connector B04 terminal No. 20 (White wire) and negative probe to ECM connector B04 terminal No. 10 (Green wire). (Scheme 87) Start engine and allow it to reach normal operating temperature. With engine at idle, observe CKP waveform. Compare to normal waveform. (Scheme 95) If CKP sensor waveform is erratic, replace CKP sensor.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source, as this will affect waveform.

Backprobing connect lab scope positive probe to ECM connector B01 terminal No. B5 (Yellow/Green wire) and negative probe to ground. (Scheme 88) Start engine and allow it to reach normal operating temperature. With engine at idle, observe CKP waveform. Compare to normal waveform. (Scheme 95) If CKP sensor waveform is erratic, replace CKP sensor.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source, as this will affect waveform.

Backprobing connect lab scope positive probe to ECM connector B01 terminal No. B3 (Blue/Orange wire) and negative probe to ground. (Scheme 89) Start engine and allow it to reach normal operating temperature. With engine at idle, observe CKP waveform. Compare to normal waveform. (Scheme 95) If CKP sensor waveform is erratic, replace CKP sensor.

Note. DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source, as this will affect waveform.

Backprobing connect lab scope positive probe to ECM connector B01 terminal No. 34 (White/Green wire) and negative probe to ECM connector terminal No. 78 (Black/Yellow wire A/T only) or ECM connector terminal No. 74 (Black/Yellow wire M/T only). (Scheme 90) Start engine and allow it to reach normal operating temperature. With engine at idle, observe CKP waveform. Compare to normal waveform. (Scheme 95) If CKP sensor waveform is erratic, replace CKP sensor.

Scheme 94

ENGINE COOLANT TEMPERATURE SENSOR

Note. Only component testing procedure is covered. For Engine Coolant Temperature (ECT) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For ECT sensor location. see scheme 1- (Scheme 81).

Note. For ECT sensor removal and installation, see ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Remove (ECT) sensor. Place sensor and thermometer in container with water and slowly heat water. Measure resistance between ECT sensor terminals No. 1 and 3. (Scheme 96) Note resistance at specified temperatures. For ECT sensor specifications, see ECT SENSOR RESISTANCE SPECIFICATIONS table. Replace ECT sensor as necessary. For ECT sensor removal and installation, see ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

ECT SENSOR RESISTANCE SPECIFICATIONS

Scheme 95

FUEL TANK PRESSURE SENSOR

Note. Only component testing procedure is covered. For Fuel Tank Pressure (FTP) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For FTP sensor removal and installation, see appropriate FUEL TANK PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Vent fuel tank by removing fuel filler cap. Ensure ignition is off. On Optima & Magentis (Canadian), remove fuel pump access cover in trunk. On Rio, Sedona and Sorento, locate FTP sensor 3-pin harness connector under rear seat, through fuel pump assembly access panel on vehicle floor. Disconnect FTP sensor harness connector. Check resistance between FTP sensor connector terminals. (Scheme 97)and FUEL TANK PRESSURE SENSOR RESISTANCE SPECIFICATIONS table. If FTP sensor is not as specified, replace FTP sensor.

FUEL TANK PRESSURE SENSOR RESISTANCE SPECIFICATIONS

Scheme 96

Optima & Magentis (Canadian) (2.4L)

Note. Only component testing procedure is covered. For Heated Oxygen (HO2S) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For H02S sensor location. see scheme 1- (Scheme 81).

Note. For HO2S sensor removal and installation, see appropriate HEATED OXYGEN SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Note. HO2S heater resistance will vary depending on temperature. In some instances, temperature value is not given by manufacturer.

1. Disconnect front or rear HO2S 4-pin harness connector. At front or rear HO2S side connector measure resistance between terminals No. 3 and 4. (Scheme 98) HO2S heater resistance should be between 3-6 ohms at 68°F (20°C). If HO2S is not as specified, replace HO2S.
2. Connect HO2S connector. Start and run engine at normal operating temperature for at least 10 minutes. Using scan tool, lab scope or voltmeter, monitor appropriate HO2S signal. If using voltmeter or lab scope, connect positive lead to front or rear HO2S harness connector terminal No. 2. Connect negative lead to ground. HO2S signal should switch from lean to rich, or rich to lean, at least 3 times every 10 seconds. Front HO2S signal should switch between 0-1 volt. Rear HO2S signal should switch between.6-.8 volt. If HO2S is not as specified, replace HO2S.

Optima & Magentis (Canadian) (2.7L)

1. Disconnect front or rear HO2S 4-pin harness connector. At front or rear HO2S side connector measure resistance between terminals No. 3 and 4. (Scheme 98) HO2S heater resistance should be between 4-5.5 ohms at 68°F (20°C). If HO2S is not as specified, replace HO2S.
2. Connect HO2S connector. Start and run engine at normal operating temperature for at least 10 minutes. Using scan tool, lab scope or voltmeter, monitor appropriate HO2S signal. If using voltmeter or lab scope, connect positive lead to right front HO2S harness connector terminal No. 2 (Red wire) or to left front HO2S harness connector terminal No. 2 (White wire). Connect negative lead to ground. On rear HO2S, connect positive lead to right rear HO2S connector terminal No. 2 (Red wire) or to left rear HO2S connector terminal No. 2 (Red wire). Signal should switch from lean to rich, or rich to lean, at least 3 times every 10 seconds. Front HO2S signal should switch between 0-1 volt. Rear HO2S signal should switch between.6-.9 volt. If HO2S is not as specified, replace HO2S.

1. Disconnect front or rear HO2S 4-pin harness connector. At front or rear HO2S side connector measure resistance between terminals No. 2 and 4. (Scheme 98) HO2S heater resistance should be between 3-7 ohms at 68°F (20°C). If HO2S is not as specified, replace HO2S.
2. Connect HO2S connector. Start and run engine at normal operating temperature for at least 10 minutes. Using scan tool, lab scope or voltmeter, monitor appropriate HO2S signal. If using voltmeter or lab scope, connect positive lead to front HO2S harness connector terminal No. 3 (Yellow/Blue wire) or to rear HO2S harness connector terminal No. 3 (White wire). Connect negative lead to ground. HO2S signal should switch from lean to rich, or rich to lean, at least 3 times every 10 seconds. Front HO2S signal should switch between 0-1 volt. Rear HO2S signal should switch between.6-.9 volt. If HO2S is not as specified, replace HO2S.

1. Disconnect front or rear HO2S 4-pin harness connector. At front or rear HO2S side connector measure resistance between terminals No. 3 and 4. (Scheme 98) HO2S heater resistance should be between 3-6 ohms at 68°F (20°C). If HO2S is not as specified, replace HO2S.
2. Connect HO2S connector. Start and run engine at normal operating temperature for at least 10 minutes. Using scan tool, lab scope or voltmeter, monitor appropriate HO2S signal. If using voltmeter or lab scope, connect positive lead to right front HO2S harness connector terminal No. 2 (Yellow/Green wire) or to left front HO2S harness connector terminal No. 2 (Blue wire). Connect negative lead to ground. On rear HO2S, connect positive lead to right rear HO2S connector terminal No. 2 (White/Yellow wire) or to left rear HO2S connector terminal No. 2 (Red wire). Signal should switch from lean to rich, or rich to lean, at least 3 times every 10 seconds. Front HO2S signal should switch between 0-1 volt. Rear HO2S signal should switch between.6-.9 volt. If HO2S is not as specified, replace HO2S.

1. Disconnect front or rear HO2S 4-pin harness connector. At front or rear HO2S side connector measure resistance between terminals No. 3 and 4. (Scheme 98) HO2S heater resistance should be between 11.0-14.0 ohms at 68°F (20°C). If HO2S is not as specified, replace HO2S.
2. Connect HO2S connector. Start and run engine at normal operating temperature for at least 10 minutes. Using scan tool, lab scope or voltmeter, monitor appropriate HO2S signal. If using voltmeter or lab scope, connect positive lead to right front HO2S harness connector terminal No. 2 (White wire) or to left front HO2S harness connector terminal No. 2 (Green wire). Connect negative lead to ground. On rear HO2S, connect positive lead to right rear HO2S connector terminal No. 2 (Yellow wire) or to left rear HO2S connector terminal No. 2 (Blue wire). Signal should switch from lean to rich, or rich to lean, at least 3 times every 10 seconds. Front HO2S signal should switch between 0-1 volt. Rear HO2S signal should switch between.6-.9 volt. If HO2S is not as specified, replace HO2S.

1. Disconnect front or rear HO2S 4-pin harness connector. At front or rear HO2S side connector measure resistance between terminals No. 1 and 3. (Scheme 98) HO2S heater resistance should be between 2-4 ohms at 68°F (20°C). If HO2S is not as specified, replace HO2S.
2. Connect HO2S connector. Start and run engine at normal operating temperature for at least 10 minutes. Using scan tool, lab scope or voltmeter, monitor appropriate HO2S signal. If using voltmeter or lab scope, connect positive lead to front HO2S harness connector terminal No. 4 (Green/Brown wire) or to rear HO2S harness connector terminal No. 4 (Green/White wire). Connect negative lead to ground. HO2S signal should switch from lean to rich, or rich to lean, at least 3 times every 10 seconds. Front HO2S signal should switch between 0-1 volt. Rear HO2S signal should switch between.6-.8 volt. If HO2S is not as specified, replace HO2S.

Scheme 97

INTAKE AIR TEMPERATURE SENSOR

Note. Only component testing procedure is covered. For Intake Air Temperature (IAT) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For IAT sensor location. see scheme 1- (Scheme 81).

Note. For IAT sensor removal and installation, see appropriate INTAKE AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Optima & Magentis (Canadian) (2.4L), Sedona & Spectra

IAT sensor, is built into Mass Air Flow (MAF) sensor. Disconnect MAF/IAT sensor 5-pin harness connector. Measure resistance between IAT sensor terminal No. 1 and 3. (Scheme 99) Resistance should be 2.22-2.82 k/ohms at 68°F (20°C). If resistance is not as specified, replace IAT sensor.

Disconnect IAT sensor 2-pin harness connector. Located IAT sensor on back part of intake manifold. Measure resistance between IAT sensor terminals No. 1 and 2. (Scheme 99) Resistance should be 2.22-2.82 k/ohms at 68°F (20°C). If resistance is not as specified, replace IAT sensor.

Disconnect IAT sensor 2-pin harness connector. Locate IAT sensor on intake manifold, near fuel injector No. 4. Measure resistance between IAT sensor terminals 1 and 2. (Scheme 99) Resistance should be 2.27-2.64 k/ohms at 68°F (20°C). If resistance is not as specified, replace IAT sensor.

IAT sensor, is built into Mass Air Flow (MAF) sensor. Disconnect MAF/IAT sensor 5-pin harness connector. Measure resistance between IAT sensor terminal No. 1 and 3. (Scheme 102) Resistance should be 2.22-2.82 k/ohms at 68°F (20°C). If resistance is not as specified, replace IAT sensor.

KNOCK SENSOR

Note. Only component testing procedure is covered. See appropriate SELF-DIAGNOSTICS article.

Note. For Knock sensor location. see scheme 1- (Scheme 81).

Note. For Knock sensor removal and installation, see appropriate KNOCK SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Knock sensor is located on left side of engine block. Disconnect 2-pin harness connector from sensor. At component side connector measure resistance between terminals No. 1 and 2. (Scheme 100) Resistance should be 4.50-5.50 k/ohms at 68°F (20°C). If resistance is not as specified, replace Knock sensor.

There are 2 knock sensors, one on each side of block. Disconnect 3-pin harness from sensor. At component side connector measure resistance between terminals No. 2 and 3. (Scheme 100) Resistance should be 4.50-5.50 5M/ohms at 68°F (20°C). If resistance is not as specified, replace Knock sensor.

Remove knock sensor from engine. Mount knock sensor in jaws of bench vise. Connect voltmeter between knock sensor connector terminals No. 1 and 2. (Scheme 100) Using hammer, sharply rap on bench vise and check for voltage spike (less than one volt). If no voltage spike is observed, replace knock sensor.

Sedona & Sorento

Knock sensor is located on center of engine block. Disconnect 2-pin harness connector from sensor. At component side connector measure resistance between terminals No. 1 and 2. (Scheme 100) Resistance should be 4.50-5.50 M/ohms at 68°F (20°C). If resistance is not as specified, replace Knock sensor.

Remove knock sensor from engine. Mount knock sensor in jaws of bench vise. Connect voltmeter between knock sensor connector terminals No. 1 and 2. (Scheme 100) Using hammer, sharply rap on bench vise and check for voltage spike (less than one volt). If no voltage spike is observed, replace knock sensor.

Scheme 98

MASS AIRFLOW SENSOR

Note. Only component testing procedure is covered. For Mass Airflow (MAF) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For MAF sensor location. see scheme 1- (Scheme 81).

Note. For MAF sensor removal and installation, see appropriate MASS AIRFLOW SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Warm up engine to normal operating temperature and let idle. Using DVOM to backprobe, measure voltage between following MAF sensor harness connector terminals and ground

1. On 2.4L, terminal No. 5 (Green wire). (Scheme 101) At idle, voltage should be 1.2-1.6 volts. When engine is accelerated voltage should increase, at 3000 RPM voltage should be between 1.6-2.2 volts. If voltage is not as specified, replace MAF sensor.
2. On 2.7L, terminal No. 2 (Green wire). (Scheme 101) At idle, voltage should be 0.6-1.0 volts. When engine is accelerated voltage should increase, at 2000 RPM voltage should be between 1.0-1.6 volts. If voltage is not as specified, replace MAF sensor.

Warm up engine to normal operating temperature and let idle. Backprobe and measure voltage between MAF sensor harness connector terminal No. 2 (Green/Yellow wire) and ground. (Scheme 101) At idle, voltage should be 0.6-0.8 volts. When engine is accelerated, voltage should be between 3.0-4.0 volts at 3000 RPM. If voltage is not as specified, replace MAF sensor.

Warm up engine to normal operating temperature and let idle. Backprobe and measure voltage between MAF sensor harness connector terminal No. 5 (Brown wire) and ground. (Scheme 101) At idle, voltage should be 0.5 volts. When engine is accelerated, voltage should be about 1.0 volts at 2000 RPM. If voltage is not as specified, replace MAF sensor.

Warm up engine to normal operating temperature and let idle. Backprobe and measure voltage between MAF sensor harness connector terminal No. 5 (Yellow wire) and ground. (Scheme 102) At idle, voltage should be 0.5 volts. When engine is accelerated, voltage should be about 1.0 volts at 2000 RPM. If voltage is not as specified, replace MAF sensor.

Warm up engine to normal operating temperature and let idle. Backprobe and measure voltage between MAF sensor harness connector terminal No. 5 (Red/White wire) and ground. (Scheme 101) At idle, voltage should be 0.8-1.2 volts. When engine is accelerated, voltage should be between 3.5-4.0 volts at 3000 RPM. If voltage is not as specified, replace MAF sensor.

Scheme 99

Scheme 100

MANIFOLD ABSOLUTE PRESSURE SENSOR

Note. Only component testing procedure is covered. For Manifold Absolute Pressure (MAP) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For MAP sensor location. see scheme 1- (Scheme 81).

Note. For MAP sensor removal and installation, see appropriate MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Optima & Magentis (Canadian) (2.4L), Sedona & Sorento

Turn ignition off. Locate MAP sensor on upper center part of intake manifold. Using DVOM backprobe MAP sensor 4-pin harness connectors terminal No. 1 and 4. (Scheme 103) Check voltage with ignition on. Voltage should be 4-5 volts. Also check voltage with engine running at idle. Voltage should be 0.8-2.4 volts. If voltage is not as specified, replace MAP sensor.

Scheme 101

POWER STEERING PRESSURE SWITCH

Note. Only component testing procedure is covered. For Power Steering Pressure (PSP) switch system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For PSP sensor location. see scheme 1- (Scheme 81).

Note. For PSP sensor removal and installation, see appropriate POWER STEERING PRESSURE SWITCH under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Power Steering Pressure (PSP) switch closes in response to an increase in power steering fluid pressure (load condition). With switch closed, a monitored voltage circuit supplied by ECM is pulled low to vehicle ground through switch. ECM then sends a signal to ISC actuator to adjust idle speed to compensate for increased engine load.

1. Turn ignition off, disconnect power steering pressure switch 1-pin harness connector located on power steering pump. Using a DVOM check for continuity between switch and chassis ground. (Scheme 104) Start engine, continuity should not exist with wheels in straight-ahead position and engine idling. Continuity should exist when steering wheel is 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.

Scheme 102

THROTTLE POSITION SENSOR

Note. Only component testing procedure is covered. For Throttle Position (TP) sensor system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For TP sensor location. see scheme 1- (Scheme 81).

Note. For TP sensor removal and installation, see appropriate THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

1. Turn ignition off. Disconnect TP 3-pin sensor harness connector. Measure resistance at component side between connector terminals No. 2 and 3. (Scheme 105) With throttle fully closed, resistance should be 3.5-6.5 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, Adjust or replace TP sensor as necessary.
2. Connect TP sensor connector. Turn ignition on. Backprobe and measure voltage between TP sensor connector terminals No. 1 (Blue wire) and No. 3 (Black wire). (Scheme 105) With throttle fully closed voltage should be.3-.9 volts. With throttle wide open, voltage should be 4.0-4.6 volts. If voltages are not as specified, Adjust or replace TP sensor as necessary.

1. Turn ignition off. Disconnect TP sensor 3-pin harness connector. Measure resistance at component side between connector terminals No. 2 and 3. (Scheme 105) With throttle fully closed, resistance should be 1.6-2.4 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, Adjust or replace TP sensor as necessary.
2. Connect TP sensor connector. Turn ignition on. Backprobe and measure voltage between TP sensor connector terminals No. 1 (Blue wire) and No. 2 (Black wire). (Scheme 105) With throttle fully closed voltage should be.2-.8 volts. With throttle wide open, voltage should be 4.0-4.4 volts. If voltages are not as specified, Adjust or replace TP sensor as necessary.

1. Turn ignition off. Disconnect TP sensor 3-pin harness connector. Measure resistance at component side between connector terminals No. 1 and 2. (Scheme 105) With throttle fully closed, resistance should be 1.6-2.4 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, replace TP sensor as necessary.
2. Connect TP sensor connector. Turn ignition on. Backprobe and measure voltage between TP sensor connector terminals No. 1 (Brown wire) and No. 3 (White wire). (Scheme 105) With throttle fully closed voltage should be.2-.8 volts. With throttle wide open, voltage should be 4.0-4.8 volts. If voltages are not as specified, replace TP sensor as necessary.

1. Turn ignition off. Disconnect TP sensor 4-pin harness connector. Measure resistance at component side between connector terminals No. 1 and 4. (Scheme 105) With throttle fully closed, resistance should be 3.5-6.5 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, Adjust or replace TP sensor as necessary.
2. Connect TP sensor connector. Turn ignition on. Backprobe and measure voltage between TP sensor connector terminals No. 2 (Red/Green wire) and No. 4 (Black/Yellow wire). (Scheme 105) With throttle fully closed voltage should be.3-.9 volts. With throttle wide open, voltage should be 4.0-4.6 volts. If voltages are not as specified, Adjust or replace TP sensor as necessary.

1. Turn ignition off. Disconnect TP sensor 4-pin harness connector. Measure resistance at component side between connector terminals No. 1 and 4. (Scheme 105) With throttle fully closed, resistance should be 3.5-6.5 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, Adjust or replace TP sensor as necessary.
2. Connect TP sensor connector. Turn ignition on. Backprobe and measure voltage between TP sensor connector terminals No. 3 (Red/Black wire) and No. 4 (Brown wire). (Scheme 106) With throttle fully closed voltage should be.3-.9 volts. With throttle wide open, voltage should be 4.2-4.7 volts. If voltages are not as specified, Adjust or replace TP sensor as necessary.

1. Turn ignition off. Disconnect TP sensor 3-pin harness connector. Measure resistance at component side between connector terminals No. 1 and 3. (Scheme 105) With throttle fully closed, resistance should be 1.6-2.4 k/ohms. As throttle is opened, resistance should smoothly increase linearly to 4.1-4.3 k/ohms at wide open throttle If resistances are as specified, go to next step. If resistances are not as specified, replace TP sensor as necessary.
2. Connect TP sensor connector. Turn ignition on. Backprobe and measure voltage between TP sensor connector terminals No. 1 (Black/Green wire) and No. 3 (Blue/Orange wire). (Scheme 105) With throttle fully closed voltage should be.3-.9 volts. With throttle wide open, voltage should be 4.0-4.4 volts. If voltages are not as specified, replace TP sensor as necessary.

Scheme 103

Scheme 104

TRANSMISSION RANGE SWITCH

Note. Only component testing procedure is covered. For Transmission Range Switch system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For Transmission Range Switch location. see scheme 1- (Scheme 81).

Note. For Transmission Range Switch removal and installation, see appropriate TRANSMISSION RANGE SWITCH under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Transmission range switch is located on top left of transaxle.

Disconnect battery negative cable. Disconnect transmission range switch connector. Using DVOM, check continuity in between transmission range switch terminals. See TRANSMISSION RANGE SWITCH SPECIFICATIONS table. If sensor does not test as specified, adjust or repair as needed.

TRANSMISSION RANGE SWITCH SPECIFICATIONS

Scheme 105

Scheme 106

Scheme 107

Scheme 108

VEHICLE SPEED SENSOR

Note. Only component testing procedure is covered. For Vehicle Speed Sensor (VSS) system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For VSS sensor location. see scheme 1- (Scheme 81).

Note. For VSS sensor removal and installation, see appropriate VEHICLE SPEED SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article.

Remove VSS from rear of transmission at top of transaxle. Connect 3-10 k/ohm resistor (Scheme 111) Connect voltmeter between terminals No. 2 and 3. Spin shaft of VSS and check for voltage pulsations. There should be 4 voltage pulsations per revolution. If there are not 4 pulsations per revolution, replace VSS.

VSS is mounted on rear of transmission at top of transaxle. Raise and support vehicle. Block one drive wheel. Turn ignition on. Backprobe and measure voltage between VSS connector terminal No. 3 (Green/Red) wire and ground while assistant spins free drive wheel. Voltage should toggle between 1-10 volts as wheel is rotated. If voltage does not toggle as specified, replace VSS.

Remove VSS from rear of transmission at top of transaxle. Connect 3-10 k/ohm resistor (Scheme 111) Connect voltmeter between terminals No. 2 and 3. Spin shaft of VSS and check for voltage pulsations. There should be 4 voltage pulsations per revolution. If there are not 4 pulsations per revolution, replace VSS.

VSS is mounted on rear of transmission at top of transaxle. Raise and support vehicle. Block one drive wheel. Turn ignition on. Backprobe and measure voltage between VSS connector terminal No. 3 (Green/Orange wire) and ground while assistant spins free drive wheel. Voltage should toggle between 1-10 volts as wheel is rotated. If voltage does not toggle as specified, replace VSS.

Scheme 109

RELAYS

Note. Only component testing procedure is covered. For circuit testing and identification, see appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS.

ECM Control Relay (Optima & Magentis (Canadian) 2.4L)

1. Remove ECM control relay located in vehicle right side of dash. (Scheme 112) Check for continuity between relay terminals No. 1 and No. 3. (Scheme 113) If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Check for continuity between relay terminals No. 4 and No. 6. (Scheme 113) If continuity does not exist, go to next step. If continuity exists, replace relay.
3. Connect a jumper wire between positive battery terminal and relay terminal No. 5. Connect another jumper wire between negative battery terminal and relay terminal No. 7. Check continuity between relay terminals No. 1 and No. 3. If continuity exist, go to next step. If continuity does not exist, replace relay.
4. Connect a jumper wire between positive battery terminal and relay terminal No. 6. Connect another jumper wire between negative battery terminal and relay terminal No. 8. Check for battery voltage at terminal No. 4. Voltage should exist. If battery voltage does not exist, replace relay.

Scheme 110

Scheme 111

Fuel Pump & Main Relays (Optima & Magentis (Canadian) 2.7L)

Note. Use same procedure to check fuel pump or main relay.

1. Remove fuel pump or main relay, located in vehicle right side of dash. (Scheme 112) Check for continuity between relay terminals No. 1 and No. 5. (Scheme 114) If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and relay terminal No. 4. Connect another jumper wire between negative battery terminal and relay terminal No. 2. Go to next step.
3. Check continuity between relay terminals No. 1 and No. 5. Continuity should exist. If continuity does not exist, replace relay.

Scheme 112

Fuel Pump & Main Relays (Rio)

Note. Use same procedure to check fuel pump or main relay.

1. Remove fuel pump or main relays from fuse/relay box. Located at left side of engine compartment. Check for continuity between relay terminals No. 2 and No. 3. (Scheme 115) If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and relay terminal No. 1. Connect another jumper wire between negative battery terminal and relay terminal No. 4. Go to next step.
3. Check continuity between relay terminals No. 2 and No. 3. Continuity should exist. If continuity does not exist, replace relay.

Scheme 113

Fuel Pump Relay (Sedona & Sorento)

Note. Fuel and main relays differ slightly. See MAIN RELAY (SEDONA & SORENTO) for main relay check procedure.

1. Remove fuel pump relay from fuse/relay box located at left side of engine compartment. Check for continuity between relay terminals "B" and "C". (Scheme 116) If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and relay terminal "D". Connect another jumper wire between negative battery terminal and relay terminal "A".
3. Check continuity between relay terminals "B" and "C". Continuity should exist. If continuity does not exist, replace relay.

Main Relay (Sedona & Sorento)

Note. Fuel and main relays differ slightly. See FUEL PUMP RELAY (SEDONA & SORENTO) for main relay check procedure.

1. Remove main relay from fuse/relay box located at left side of engine compartment. Check for continuity between relay terminals "B" and "D". Then check for continuity between relay terminals "C" and "D". (Scheme 116) If in either check continuity does not exist, go to next step. If in either check continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and relay terminal "E". Connect another jumper wire between negative battery terminal and relay terminal "A".
3. Check continuity between relay terminals "B" and "D". Continuity should exist. If continuity does not exist, replace relay.

Scheme 114

Fuel Pump & Main Relays (Spectra)

Note. Use same procedure to check fuel pump or main relay.

1. Remove fuel pump or main relay from fuse/relay box. Located at left side of engine compartment. Check for continuity between relay terminals No. 1 and 3. (Scheme 117) If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and relay terminal No. 2. Connect another jumper wire between negative battery terminal and relay terminal No. 4.
3. Check continuity between relay terminals No. 1 and 3. Continuity should exist. If continuity does not exist, replace relay.

Scheme 115

SOLENOIDS

For solenoids and valves testing procedure, see appropriate test in EMISSION SYSTEMS & SUB-SYSTEMS .

FUEL SYSTEM - DELIVERY

Note. If fuel pressure is not as specified, perform fuel filter inspection. For fuel filter location, removal & installation, see appropriate FUEL FILTER under FUEL SYSTEM in REMOVAL & INSTALLATION article. If fuel filter checks okay, check fuel pump. See FUEL PUMP OPERATION .

Except Optima & Magentis (Canadian)

To release fuel pressure, remove rear seat cushion. Locate access to fuel pump harness connector. (On Sorento remove rear seat. Fuel pump service cover is under center carpet). Disconnect fuel pump harness connector. Start engine and allow to idle until it stalls. Turn ignition off. Disconnect negative battery cable. When testing or repair is complete, reconnect fuel pump connector and negative battery cable. Install rear seat cushion. Prime fuel system. See PRIMING FUEL SYSTEM .

To release fuel pressure, locate access to fuel pump harness connector in trunk. Disconnect fuel pump harness connector. Start engine and allow to idle until it stalls, turn ignition off. Disconnect negative battery cable. When testing or repairs are complete, reconnect fuel pump harness connector and negative battery cable. Prime fuel system. See PRIMING FUEL SYSTEM .

PRIMING FUEL SYSTEM

After performing any operation that requires releasing fuel pressure, fuel system should be primed to prevent long cranking times. To prime fuel system, jumper Data Link Connector (DLC) terminal FUEL PUMP and (B+). DLC on all models is on left side of engine compartment. (Scheme 118)and (Scheme 119) Turn ignition on for no longer than 10 seconds to run pump and pressurize fuel system. Turn ignition off and remove jumper wire. Check for leaks. Repair any leaks as necessary.

Scheme 116

Scheme 117

FUEL PRESSURE

Fuel Pressure (Optima & Magentis (Canadian))

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). 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 120)or (Scheme 121). Tighten fuel gauge adapter bolts 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 is present at pressure gauge or connection. See «PRIMING FUEL SYSTEM»(ref-151849-S04772304672003010800000). 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 «FUEL PRESSURE SPECIFICATIONS»(ref-151849-S25905099042003010800000) table. If fuel pressures 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 following conditions: Restricted fuel filter. Fuel pressure regulator leaking fuel to fuel return side. Leaking in-tank fuel pick-up hose. Low fuel pump discharge pressure. Repair or replace as necessary. Recheck fuel pressure.
6. If fuel pressure is greater than specified, check for sticking fuel pressure regulator. A restricted or bent fuel return hose or pipe. Repair or replace fuel hose or pipe and fuel pressure regulator. To replace fuel pressure regulator, see «FUEL PRESSURE REGULATOR (EXCEPT SPECTRA)»(ref-151853-S22253524952003010800000) under FUEL SYSTEM in REMOVAL OVERHAUL & INSTALLATION article.
7. If fuel pressure does not change when regulator vacuum hose is connected and disconnected, check for following conditions: Restricted or damaged vacuum hose. Restricted manifold vacuum port. Sticking or poorly seated fuel pressure regulator valve. Repair or replace as necessary. Recheck fuel pressure.
8. If fuel pressures are as specified, stop engine and check for decrease in fuel pressure gauge. Fuel pressure should hold for approximately 5 minutes. If fuel pressure decreases slowly after engine is stopped, check for leaking injector. See «FUEL INJECTOR LEAKAGE TEST»(ref-151849-S10773721922003010800000), under FUEL INJECTORS. Replace as necessary. If fuel pressure decreases immediately after engine is stopped, check-valve inside fuel pump is not working. Replace fuel pump. To replace fuel pump, see «FUEL PUMP REMOVAL (OPTIMA & MAGENTIS (CANADIAN))»(ref-151853-S22695915142003010800000) under FUEL SYSTEM in REMOVAL & INSTALLATION article. After repairs are completed, recheck fuel pressure.
9. After testing is completed, release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). Disconnect fuel pressure gauge from adapter. Ensure hose connection is covered by shop towel to prevent fuel spray. Remove adapter bolts and adapter. Install NEW "O" ring, and reinstall fuel line with original bolts. Apply battery voltage to fuel pump drive connector terminal. (Scheme 118) Check for fuel leaks. Repair any leaks as necessary.

Scheme 118

Scheme 119

Fuel Pressure (Rio)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). Disconnect high-pressure fuel hose from fuel delivery pipe. Cover hose connection using rags to avoid spraying of fuel. Disconnect battery negative cable. Install fuel pressure gauge (0K2A1 131 001A) on to high-pressure fuel line. (Scheme 122) Connect battery negative cable.
2. Using fuel pump check terminal connector, operate fuel pump and ensure no fuel leakage is present at pressure gauge or connection. See «PRIMING FUEL SYSTEM»(ref-151849-S04772304672003010800000). If no leaks are present, check fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-151849-S25905099042003010800000) table.
3. 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 or pipes and fuel pressure regulator as necessary. To replace fuel pressure regulator, see «FUEL PRESSURE REGULATOR (EXCEPT SPECTRA)»(ref-151853-S22253524952003010800000) under FUEL SYSTEM in REMOVAL OVERHAUL & INSTALLATION article. If fuel pressure is less than specified, go to next step.
4. Clamp return line and check if fuel pressure rises. If pressure does rise, replace fuel pressure regulator. To replace fuel pressure regulator, see «FUEL PRESSURE REGULATOR (EXCEPT SPECTRA)»(ref-151853-S22253524952003010800000) under FUEL SYSTEM in REMOVAL OVERHAUL & INSTALLATION article. If pressure does not rise, measure fuel pump maximum pressure. See «MAXIMUM FUEL PRESSURE (RIO & SPECTRA)»(ref-151849-S21991418322003010800000).
5. Stop engine and check for decrease in fuel pressure gauge. See «HOLDING FUEL PRESSURE (RIO & SPECTRA)»(ref-151849-S04886995922003010800000). Fuel pressure should hold for approximately 25 minutes. If fuel pressure decreases slowly after engine is stopped, check for leaking injector. See «FUEL INJECTOR LEAKAGE TEST»(ref-151849-S10773721922003010800000), under FUEL INJECTORS. Replace fuel injectors as necessary. If fuel pressure decreases immediately after engine is stopped, check-valve inside fuel pump is not working. Replace fuel pump. To replace fuel pump, see RIO under «FUEL PUMP»(ref-151853-S35598403952003010800000) in REMOVAL & INSTALLATION article. After repairs are completed, recheck fuel pressure.
6. After testing is completed, release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). Disconnect fuel pressure gauge from adapter. Ensure hose connection is covered by shop towel to prevent fuel spray. Remove adapter bolts and adapter. Replace any old seals with NEW seals, and reinstall fuel line. Apply battery voltage to fuel pump drive connector terminal. (Scheme 118) Check for fuel leaks. Repair any leaks as necessary.

Scheme 120

Scheme 121

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). 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 123) Connect negative battery cable.
3. Using fuel pump check terminal connector, operate fuel pump and ensure no fuel leakage is present at pressure gauge or connection. See «PRIMING FUEL SYSTEM»(ref-151849-S04772304672003010800000). 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 «FUEL PRESSURE SPECIFICATIONS»(ref-151849-S25905099042003010800000) 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 following conditions: Restricted fuel filter. Fuel pressure regulator leaking fuel to fuel return side. Leaking in-tank fuel pick-up hose. Low fuel pump discharge pressure. Repair or replace as necessary. Recheck fuel pressure.
6. If fuel pressure is greater than specified, check for sticking fuel pressure regulator. A restricted or bent fuel return hose or pipe. Repair or replace fuel hose or pipe as necessary, or replace fuel pressure regulator. To replace fuel pressure regulator, see «FUEL PRESSURE REGULATOR (EXCEPT SPECTRA)»(ref-151853-S22253524952003010800000) under FUEL SYSTEM in REMOVAL OVERHAUL & INSTALLATION article.
7. If fuel pressure does not change when regulator vacuum hose is connected and disconnected, check for following conditions: Restricted or damaged vacuum hose. Restricted manifold vacuum port. Sticking or poorly seated fuel pressure regulator valve. Repair or replace as necessary. Recheck fuel pressure.
8. If fuel pressures are as specified, stop engine and check for decrease in fuel pressure gauge. Fuel pressure should hold for approximately 5 minutes. If fuel pressure decreases slowly after engine is stopped, check for leaking injector. See «FUEL INJECTOR LEAKAGE TEST»(ref-151849-S10773721922003010800000) under FUEL INJECTORS. Replace as necessary. If fuel pressure decreases immediately after engine is stopped, check-valve inside fuel pump is not working. Replace fuel pump. To replace fuel pump, see SEDONA or SORENTO under «FUEL PUMP»(ref-151853-S35598403952003010800000) in REMOVAL & INSTALLATION article. After repairs are completed, recheck fuel pressure and go to next step.
9. After testing is completed, release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). Disconnect fuel pressure gauge from adapter. Ensure hose connection is covered by shop towel to prevent fuel spray. Remove adapter bolts and adapter. Install NEW "O" ring, and reinstall fuel line with original bolts. Tighten bolts to 27-35 INCH lbs (3-4 N.m). Apply battery voltage to fuel pump drive connector terminal. (Scheme 119) Check for fuel leaks. Repair any leaks as necessary.

Fuel Pressure (Spectra)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). Disconnect battery negative cable. Install Fuel Pressure Gauge (0K2A1 131 001) on service port at center of fuel rail. see scheme 49
2. Connect battery negative cable. To operate fuel pump, jumper DLC terminals FUEL PUMP and (B+). DLC is located on left side of engine compartment. (Scheme 118)
3. Turn ignition on for 10 seconds or less. Check fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-151849-S25905099042003010800000) table. Turn ignition off and remove jumper wire.
4. If fuel pressure is too high, check for restricted return line. If return line is open, replace pressure regulator. To replace fuel pressure regulator, see «FUEL PRESSURE REGULATOR»(ref-151853-S06607003752003010800000) under FUEL SYSTEM in REMOVAL OVERHAUL & INSTALLATION article.
5. If fuel pressure is too low, block return line. Operate fuel pump again and see if pressure rises. If pressure rises, replace fuel pressure regulator. To replace fuel pressure regulator, see FUEL PRESSURE REGULATOR under FUEL SYSTEM in REMOVAL OVERHAUL & INSTALLATION article. If pressure does not rise, check fuel pump maximum pressure. See «MAXIMUM FUEL PRESSURE (RIO & SPECTRA)»(ref-151849-S21991418322003010800000).

Scheme 122

Holding Fuel Pressure (Rio & Spectra)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). Disconnect battery negative cable. Install fuel pressure gauge on to high-pressure fuel line. For Rio (Scheme 122) For Spectra see scheme 49 Connect battery negative cable.
2. Jumper DLC terminals FUEL PUMP and (B+). DLC is located on left side of engine compartment. (Scheme 118) Turn ignition on for 10 seconds or less to operate fuel pump and pressurize system. Turn ignition off and remove jumper wire.
3. On Rio, check fuel pressure after 25 minutes. On Spectra, check fuel pressure after 15 minutes. See «FUEL PRESSURE SPECIFICATIONS»(ref-151849-S25905099042003010800000) table. If pressure is not as specified, check fuel pump, pressure regulator and injectors.

MAXIMUM FUEL PRESSURE

Note. Maximum fuel pressure specification and test procedure for Optima & Magentis (Canadian), Sedona & Sorento is not available from manufacturer.

Maximum Fuel Pressure (Rio & Spectra)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-151849-S05077404972003010800000). Disconnect battery negative cable. Remove rear seat cushion. Connect Fuel Pressure Gauge (0K2A1 131 001) to main fuel line at fuel tank. see scheme 50 Connect battery negative cable.
2. To operate fuel pump, jumper DLC terminals FUEL PUMP and (B+). DLC is located on left side of engine compartment. (Scheme 118) Turn ignition on. Check maximum fuel pressure. Do not run fuel pump longer than necessary to check fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-151849-S25905099042003010800000) table. If fuel pressure is not as specified, replace fuel pump. To replace fuel pump, see RIO or SPECTRA under «FUEL PUMP»(ref-151853-S35598403952003010800000) in REMOVAL & INSTALLATION article.

Scheme 123

FUEL PRESSURE SPECIFICATIONS

SPARK

Note. All model are equipped with a Distributorless Ignition System (DIS).

Note. Ensure high tension leads are routed properly after removal and installation.

Check for spark at each spark plug wire using a high output spark tester. Check spark plug wire resistance on suspect wires. High tension wire resistance should not exceed 16,000 ohms per 3.3 feet.

Camshaft Position Sensor (CMP) sensor detects No. 1 piston at TDC of compression stroke. ECM uses input for fuel and ignition control. For CMP sensor testing, see CAMSHAFT POSITION SENSOR .

Crankshaft Position Sensor (CKP) sensor detects crankshaft angle. ECM uses input to determine engine speed, misfire detection, and for fuel and ignition control. For CKP sensor testing, see CRANKSHAFT POSITION SENSOR .

IGNITION COIL POWER SOURCE

Ensure ignition is off. Disconnect ignition coil harness connectors. Turn ignition on. Check for battery voltage at ignition power source wire. To identify wire, see IGNITION COIL POWER SOURCE table. On all models, if battery voltage is not present, check battery feed circuit, main fuse, ignition switch and wiring harness.

IGNITION COIL POWER SOURCE

Optima & Magentis (Canadian) 2.4L, Sedona & Sorento

Note. Power transistor is built into ignition coil.

To perform primary coil resistance check, connect negative (-) terminal of a 3 volt power supply to terminal No. 2 of power transistor. (Scheme 126) Check for continuity, about.78 Ohm, between terminals No. 2 and 3. Continuity should exist when terminal No. 1 is connected to 3 volt power (+) supply. When 3 volt power supply is removed, continuity should no longer exist. If problem exists, replace power transistor/ignition coil. To test secondary resistance measure resistance between high-voltage terminals of ignition coil (Scheme 126) For resistance specification, see IGNITION COIL RESISTANCE table.

Scheme 124

Optima & Magentis (Canadian) 2.7L

Measure resistance between connector terminals No. 4 and 1, 4 and 2 and 4 and 3. (Scheme 127) For ignition coil resistance, see IGNITION COIL RESISTANCE table. If resistance is not as specified, replace coil pack.

Scheme 125

Rio & Spectra

To check primary coil resistance, disconnect ignition coil harness connector. Using ohmmeter, check primary resistance between positive (+) and negative (-) terminal of coil or coil pack. Check secondary resistance between coil towers. For resistance check procedure on Rio (Scheme 128) For Spectra resistance check procedure (Scheme 129) Also see IGNITION COIL RESISTANCE table for resistance specification. If readings are not within specification, replace ignition coil(s).

Scheme 126

Scheme 127

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

EXHAUST GAS RECIRCULATION SYSTEM (OPTIMA & MAGENTIS (CANADIAN) 2.4L)

Note. For component identification and location (Scheme 130)and (Scheme 131).

1. Exhaust Gas Recirculation (EGR) system is operated by ECM during coasting. ECM activates EGR solenoid valve allowing intake vacuum to EGR valve. The manifold pressure is measured before and after EGR valve has been activated and the corresponding pressure variation is compared with reference value to detect a EGR system malfunction. If malfunction is detected, go to next step.
2. Check all EGR system vacuum hoses, pipe and passage for damage, blockage or restriction between: Throttle body to EGR solenoid valve vacuum hose. EGR solenoid valve to EGR valve vacuum hose. EGR valve to exhaust manifold pipe. EGR valve to intake manifold passage. If malfunction is found, repair or replace as necessary. If no malfunction is found, go to next step.
3. Check EGR valve operation. For EGR valve operation, see «EXHAUST GAS RECIRCULATION VALVE»(ref-151849-S27352827442003010800000) . If EGR valve malfunction is found, repair or replace as necessary. If no malfunction is found, go to next step.
4. Check EGR solenoid valve operation. For EGR solenoid valve operation, see «EXHAUST GAS RECIRCULATION SOLENOID VALVE»(ref-151849-S08967280302003010800000) . If EGR solenoid valve malfunction is found, repair or replace as necessary. If no malfunction is found, go to next step.
5. For more EGR system circuit testing procedure, and check other systems related to EGR system. See appropriate SELF-DIAGNOSTICS article.

Scheme 128

Scheme 129

EXHAUST GAS RECIRCULATION VALVE (OPTIMA & MAGENTIS (CANADIAN) 2.4L)

Note. For Exhaust Gas Recirculation (EGR) valve removal and installation, see EXHAUST GAS RECIRCULATION VALVE under EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL & INSTALLATION article.

1. Connect vacuum pump to EGR valve fitting port. Apply vacuum to EGR valve and observe if vacuum is held. (Scheme 132) If vacuum is held, go to next step. If vacuum is not held, replace EGR valve.
2. While vacuum pump is connected to EGR valve fitting port. Start engine and let it idle. Apply vacuum and observe for idle changes. If idle change is observe, EGR valve is operating properly. If no idle change is notice, turn engine off and go to next step.
3. Remove EGR valve, check for excessive carbon deposit. Connect vacuum pump to EGR valve fitting port. Apply vacuum and ensure EGR valve moves freely, blow air into exhaust pipe port, while vacuum is apply. see scheme 61 Air should go through and out intake port. While blowing air into exhaust pipe port, release vacuum and ensure no air passes through. If malfunction is found, repair or replace EGR valve as necessary.

Scheme 130

Scheme 131

EXHAUST GAS RECIRCULATION SOLENOID VALVE (OPTIMA & MAGENTIS (CANADIAN) 2.4L)

Note. Only component testing procedure is covered. For Exhaust Gas Recirculation (EGR) solenoid valve system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For EGR solenoid valve removal and installation, see EXHAUST GAS RECIRCULATION SOLENOID VALVE under EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL & INSTALLATION article.

1. Disconnect EGR solenoid valve 2-pin harness connector. Check resistance between EGR solenoid valve terminals. (Scheme 133)test procedure No. 1. Resistance should be 30-34 ohms at 68°F (20°C). If resistance is not as specified, replace EGR solenoid valve. If resistance is as specified, go to next step.
2. Using a fused jumper wire, connect battery voltage to terminal No. 1, energize EGR solenoid by grounding terminal No. 2. Listen for operational sound (click). (Scheme 133)test procedure No. 2. If operational sound is heard, go to next step. If operational sound is not heard, replace EGR solenoid valve.
3. Connect vacuum pump to port "A" of EGR solenoid valve. While EGR solenoid valve is operated by battery power, Apply vacuum. (Scheme 133)test procedure No. 3. If vacuum is not held, EGR solenoid valve is operating properly. If vacuum is held, replace EGR solenoid valve.

Scheme 132

FUEL EVAPORATION SYSTEM

Note. Only component testing procedure is covered. For component system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Note. For component removal and installation, see appropriate component under EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL & INSTALLATION article.

Canister Close Valve

1. Canister Close Valve (CCV) is located near EVAP canister. Measure resistance between CCV terminals. Resistance should be 23-26 ohms at 68°F (20°C). (Scheme 135)test procedure No. 1. If resistance is not as specified, replace CCV. If resistance is as specified, go to next step.
2. Remove CCV. CCV should be open. Blow air into port "A" and verify air escapes from port "B". Close CCV using a fused jumper wire connected to battery voltage and terminal No. 1 (Sedona), and grounding terminal No. 2. All other models, connect battery voltage to terminal No. 2, and grounding termial No. 1. (Scheme 135)test procedure No. 2. Blow air into port "A" and verify air does not escape from port "B". If air does not escape from port "B", CCV is operating properly. If air escape from port "B" replace CCV.

Scheme 133

Evaporative Emissions Canister

Check for loose connections, sharp bends or damage fuel vapor lines, canister cracks or fuel leakage. Repair or replace as necessary. No liquid should exist in Evaporative Emissions Canister (EVAP) canister. For EVAP Canister location, see EVAPORATIVE EMISSIONS CANISTER LOCATION table.

EVAPORATIVE EMISSIONS CANISTER LOCATION

On-Board Refueling Vapor Recovery

Note. For on-board refueling vapor recovery system, only some components testing procedure is available from manufacturer.

On-Board Refueling Vapor Recovery (ORVR) system, is properly designed to prevent the fuel tank vapor emissions (HC), escape to ambient air during refueling.

This system consists of fuel filler neck, fuel vent valve, fuel shot-off valve, fuel cut valve (roll over), two way valve, fuel liquid/vapor separator and charcoal canister. For components identification (Scheme 134)

While refueling, flow and column of refueling draws ambient air into filler pipe so fuel vapor is not emitted in the ambient air. Fuel vapor in tank is then forced to flow into canister via fuel vent valve and fuel liquid/vapor separator, which insulates liquid fuel ingredients and transfers pure vapor into charcoal canister.

While engine is operating, trapped vapor emissions in canister is draw and fed by intake manifold vacuum into engine combustion chamber. According to this process, charcoal canister is purged and recovers its absorbing capability.

Purge Control Solenoid Valve (Optima & Magentis (Canadian) 2.4L, Sedona & Sorento)

1. Disconnect Purge Control Solenoid Valve (PCSV) 2-pin harness connector. Locate PCSV (Scheme 136)and (Scheme 137). Measure resistance between two terminals (component side). (Scheme 138)test procedure No. 1. Resistance should be 24-28 ohms at 68°F (20°C). If resistance is not as specified, replace PCSV. If resistance is as specified, go to next step.
2. Remove PCSV. PCSV is normally closed. Connect a vacuum pump to PCSV port "A" and apply vacuum, vacuum should be held. While applying vacuum, open PCSV by jumpering one PCSV terminal to battery positive terminal. Jumper other PCSV terminal to battery negative terminal. (Scheme 138)test procedure No. 2. Check if vacuum is released when PCSV is open. If problem exist, replace PCSV.

Scheme 134

Scheme 135

Scheme 136

Purge Control Solenoid Valve (Optima & Magentis (Canadian) 2.7L, Rio & Spectra)

1. Disconnect Purge Control Solenoid Valve (PCSV) 2-pin harness connector. Locate PCSV (Scheme 139)- (Scheme 141). Measure resistance between two terminals (component side). (Scheme 141)test procedure No. 1. Resistance should be 24-28 ohms at 68°F (20°C). If resistance is not as specified, replace PCSV. If resistance is as specified, go to next step.
2. Remove PCSV. Blow air into port "A" and verify air does not escape from port "B", PCSV should be closed. Open PCSV by jumpering one PCSV terminal to battery positive terminal. Jumper other PCSV terminal to battery negative terminal. (Scheme 141)test procedure No. 2. Blow air into port "A" and verify air escapes from port "B". If air escapes from port "B" when PCSV is closed and/or does not escape when PCSV is open, replace PCSV.

Scheme 137

Scheme 138

Scheme 139

Two-Way Valve (Overfill Limiter)

1. Two-Way valve consist of a pressure valve and a vacuum valve. Pressure valve side is designed to open when fuel tank internal pressure has increased over normal pressure, and vacuum valve side opens when vacuum has been produced in fuel tank. For Two-Way valve identification see scheme 71 For valve test, go to next step.
2. Connect vacuum pump to inlet side of Two-Way valve. see scheme 72 Apply vacuum, negative pressure is generated and vacuum should be held. If vacuum is not held, replace Two-Way valve. If vacuum is held, go to next step.
3. Connect vacuum pump to outlet side of Two-Way valve. Apply vacuum, negative pressure should not be generated. If negative pressure is generated, replace Two-Way valve as necessary.

Scheme 140

Scheme 141