Engine Controls - System/component Tests - 3.0L: Other Toyota Camry V40

INTAKE AIR CONTROL VALVE SYSTEM

Note. Intake Air Control Valve (IACV) system may also be referred to as Acoustic Control Induction System (ACIS).

Scheme 64

Scheme 65

1. Using "T" connector, connect vacuum gauge in vacuum line to actuator valve, located at end of air intake chamber. (Scheme 64) Start engine. With engine idling, ensure no vacuum reading is obtained.
2. Fully open throttle and ensure vacuum reading momentarily reads approximately 8 in. Hg and actuator valve rod pulls inward. If actuator valve rod pulls inward, system is operating correctly. If actuator valve rod does not pull inward, proceed to next step.
3. Disconnect vacuum hose from actuator valve. Using vacuum pump, apply 8 in. Hg of vacuum to actuator valve. Ensure actuator valve rod pulls inward and remains pulled inward for at least one minute. Replace actuator valve if defective. If actuator valve operates correctly, reconnect vacuum hose. Proceed to next step.
4. Disconnect hoses from vacuum tank located near driver's side front corner of engine compartment, below battery tray. Apply air pressure to port "B" on vacuum tank. Ensure air flows from port "A". Perform STEP 1. (Scheme 65) Apply air pressure to port "A". Ensure air does not flow from port "B". Perform STEP 1. (Scheme 65)
5. Plug port "B" on vacuum tank. Using vacuum pump, apply 8 in. Hg of vacuum to port "A". Perform STEP 2. (Scheme 65) Ensure vacuum reading will hold for at least one minute. Replace vacuum tank if defective and recheck system operation. If vacuum tank is okay, reconnect vacuum hoses. Proceed to next step.
6. Remove "V" bank cover located on top of engine. (Scheme 66) Disconnect electrical connector and vacuum hoses from intake air control valve Vacuum Switching Valve (VSV) located near valve cover. (Scheme 66) NOTE: It may be necessary to remove emission control valve set which contains various vacuum switching valves for access to intake air control valve VSV.
7. Using ohmmeter, check that continuity exists between electrical terminals on intake air control valve VSV and that resistance is 33-39 ohms at 68°F (20°C). Replace intake air control valve VSV if no continuity exists or resistance is not within specification.
8. Ensure no continuity exists between each electrical terminal and body of intake air control valve VSV. Replace intake air control valve VSV if continuity exists between electrical terminal and body of intake air control valve VSV.
9. Apply air pressure to port "B". Ensure air flows from the filter. Perform STEP 1. (Scheme 67) Apply battery voltage and ground to electrical terminals on intake air control valve VSV. Apply air pressure to port "B". Ensure air flows from port "A". Perform STEP 2. (Scheme 67) Replace intake air control valve VSV if defective. Recheck system operation.
10. If intake air control valve VSV is okay, reinstall VSV. Remove glove box for access to Engine Control Module (ECM). Turn ignition on. Using voltmeter, check voltage between terminal No. 6 (Red/Yellow wire) on ECM and chassis ground. (Scheme 68)
11. Voltage should be 9-14 volts. If voltage is not within specification, check for defective EFI main relay or wiring harness between EFI main relay and ECM. See EFI main relay under RELAYS. See appropriate wiring diagram in WIRING DIAGRAMS article.
12. If EFI main relay and wiring harness are okay, check ECM ground circuit. If ECM ground circuit is okay, substitute another ECM and recheck system operation.

Scheme 66

Scheme 67

Scheme 68

Power & Ground Circuits

For testing of Engine Control Module (ECM) power and ground circuits, see PIN VOLTAGE CHART S article. See ECM LOCATION table for identifying ECM mounting locations.

ECM LOCATION

AIRFLOW METER

Note. Airflow meter may be referred to as Mass Airflow (MAF) meter.

1. Turn ignition off. Disconnect electrical connector from airflow meter. Note airflow meter terminal identification. (Scheme 69)
2. Using ohmmeter, check resistance between terminal E2 and THA. Resistance should be within specification in relation to the temperature. See «AIRFLOW METER RESISTANCE SPECIFICATIONS»(ref-21996-S37231094992001010300000) table. Replace airflow meter if resistance is not within specification.
3. To test airflow meter operation, ensure electrical connector is installed on airflow meter. Connect voltmeter leads to proper terminals on airflow meter with electrical connector installed. (Scheme 70)
4. Turn ignition on. Apply air into airflow meter and note voltage reading. (Scheme 70) While air is being applied, voltage reading should fluctuate. Replace airflow meter if voltage does not fluctuate. Remove voltmeter.

AIRFLOW METER RESISTANCE SPECIFICATIONS

Scheme 69

Scheme 70

CAMSHAFT POSITION SENSOR

For testing camshaft position sensor, see CAMSHAFT POSITION SENSOR under IGNITION CHECKS in BASIC TESTING - 3.0L article.

CRANKSHAFT POSITION SENSOR

For testing crankshaft position sensor, see CRANKSHAFT POSITION SENSOR under IGNITION CHECKS in BASIC TESTING - 3.0L article.

EGR GAS TEMPERATURE SENSOR

1. Remove EGR gas temperature sensor from EGR valve. Place threaded end of EGR gas temperature sensor and thermometer in container of oil.
2. Attach ohmmeter between electrical terminals on EGR gas temperature sensor. Heat oil and note resistance at specified temperature. See «EGR GAS TEMPERATURE SENSOR SPECIFICATIONS»(ref-21996-S39476271842001010300000) table. Replace EGR gas temperature sensor if resistance is not within specification. Reinstall EGR gas temperature sensor.

EGR GAS TEMPERATURE SENSOR SPECIFICATIONS

ENGINE COOLANT TEMPERATURE (ECT) SENSOR

1. Ensure ignition is off. Disconnect electrical connector from ECT sensor. See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION»(ref-21996-S12096973052001010300000) table. To verify wire colors for proper sensor identification, see appropriate wiring diagram in WIRING DIAGRAMS article. NOTE: The ECT sensor may be also identified using appropriate illustration in «THEORY/OPERATION - 3.0L»(ref-21904) article.
2. Using ohmmeter, check resistance between electrical terminals on ECT sensor. Resistance should be within specification at designated temperature. (Scheme 71) Replace ECT sensor if resistance is not within specification.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION

Scheme 71

KNOCK SENSOR

1. Knock sensors are located below intake manifold on the cylinder block. (Scheme 72) Remove knock sensor from cylinder block before testing. See REMOVE/INSTALL/OVERHAUL article.
2. Using ohmmeter, check that no continuity exists between electrical terminal of knock sensor and body of knock sensor. Replace knock sensor if continuity exists.

Scheme 72

HEATED OXYGEN SENSOR

1. Three heated oxygen sensors are used. A heated oxygen sensor is used on each exhaust manifold and one on exhaust pipe behind catalytic converter.
2. If problem exists with heated oxygen sensor, a diagnostic trouble code will be stored in Engine Control Module (ECM). For diagnostic trouble code diagnosis, see «TESTS W/CODES - 3.0L»(ref-21942) article.
3. To test heater on heated oxygen sensor, disconnect electrical connector from appropriate heated oxygen sensor and note heated oxygen sensor terminals. (Scheme 73)
4. Electrical connector for heated oxygen sensor on exhaust pipe behind catalytic converter is located below passenger's side front seat, below carpet, near center console and contains a Dark Gray 4-pin electrical connector.
5. On all heated oxygen sensors, using ohmmeter, check resistance between heated oxygen sensor terminals +B and HT. (Scheme 73) Replace heated oxygen sensor if resistance is not within specification. See «OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS»(ref-21996-S32897563492001010300000) table.

OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS

Scheme 73

A/T Models

If problem exists with Park/Neutral Position (PNP) switch or circuit, a diagnostic trouble Code P1780 will be stored in the Engine Control Module (ECM). See TESTS W/CODES - 3.0L article for accessing diagnostic trouble codes.

1. Disconnect electrical connector from Park/Neutral Position (PNP) switch mounted on side of transmission/transaxle. Note terminal identification. (Scheme 73)
2. Using ohmmeter, check for continuity between specified terminals with shift lever in proper positions. See «PARK/NEUTRAL POSITION SWITCH SPECIFICATIONS»(ref-21996-S33708098222001010300000) table. If proper continuity cannot obtained, adjust or replace switch as necessary.

PARK/NEUTRAL POSITION SWITCH SPECIFICATIONS

Scheme 74

THROTTLE POSITION SENSOR

1. Ensure ignition is off. Disconnect electrical connector from Throttle Position (TP) sensor located on throttle body. Note terminal identification. (Scheme 75)
2. Apply vacuum to throttle opener. Insert specified thickness feeler gauge between throttle stop screw and throttle lever and check resistance or continuity. See appropriate «THROTTLE POSITION SENSOR RESISTANCE SPECIFICATIONS»(ref-21996-S11558787782001010300000) table. Replace or adjust TPS if not within specification.

Scheme 75

THROTTLE POSITION SENSOR RESISTANCE SPECIFICATIONS

VEHICLE SPEED SENSOR

1. Vehicle speed sensor is located on transaxle and contains a Black 3-pin electrical connector. Connect voltmeter positive lead to terminal No. 3 (outer terminal) and negative lead to terminal No. 2 (center terminal) on vehicle speed sensor terminals. (Scheme 76)
2. Using jumper wires, connect positive battery terminal to terminal No. 1 (outer terminal) and negative battery terminal to terminal No. 2 (center terminal) on vehicle speed sensor terminals. (Scheme 76)
3. While rotating vehicle speed sensor shaft, ensure voltage changes from zero to at least 11 volts. Voltage should change 4 times per revolution of the shaft. Replace vehicle speed sensor if voltage does not change as specified. Remove test equipment.

Scheme 76

CIRCUIT OPENING RELAY

1. Ensure ignition is off. Remove circuit opening relay. See «CIRCUIT OPENING RELAY LOCATION»(ref-21996-S09475357072001010300000) table. NOTE: Circuit opening relay may also be identified using appropriate illustration in «THEORY/OPERATION - 3.0L»(ref-21904) article and wire color. See appropriate wiring diagram in WIRING DIAGRAMS article. CIRCUIT OPENING RELAY LOCATION Application Relay Location Camry In Relay Box Located Behind Glove Box
2. To test circuit opening relay continuity, using ohmmeter, check continuity between specified terminals. (Scheme 77)and (Scheme 78).
3. To test circuit opening relay operation, apply battery voltage and ground to relay and use ohmmeter to check continuity between specified terminals. (Scheme 77)and (Scheme 78). Replace circuit opening relay if defective.

Scheme 77

Scheme 78

EFI MAIN RELAY

Note. EFI main relay may also be referred to as EFI relay.

1. Ensure ignition is off. Remove EFI main relay from fuse/relay box located near driver's side front corner of engine compartment, near battery.
2. To test EFI main relay continuity, using ohmmeter, check continuity between specified terminals. (Scheme 79)-19.
3. To test EFI main relay operation, apply battery voltage and ground to relay and use ohmmeter to check continuity between specified terminals. (Scheme 79)-19. Replace EFI main relay if defective.

Scheme 79

Scheme 80

Scheme 81

Scheme 82

See CIRCUIT OPENING RELAY under RELAYS.

See EFI MAIN RELAY under RELAYS.

Fuel Pump Pressure

For fuel pump pressure testing, see BASIC TESTING - 3.0L article.

Fuel Injectors

1. Ensure ignition is off. Disconnect electrical connector at fuel injector. Using ohmmeter, measure resistance between electric terminals on fuel injector. Replace fuel injector if resistance is not 13.8 ohms at 68°F (20°C).
2. To check fuel injector spray pattern and volume, remove fuel injector. See REMOVE/INSTALL/OVERHAUL article. Disconnect fuel hose from fuel filter outlet. Use Delivery Hose (09268-41046) to install fuel injector between fuel filter and pressure regulator. (Scheme 83)
3. Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
4. Use scan tester to operate the fuel pump or apply battery voltage to electric fuel pump to pressurize the fuel system. See FUEL PRESSURE in «BASIC TESTING - 3.0L»(ref-21922) article.
5. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 84) Measure fuel injector volume. Remove vinyl tube from fuel injector and check spray pattern. Test each fuel injector 2-3 times. Replace fuel injector if fuel injector volume is not within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-21996-S37175505982001010300000) table. NOTE: Ensure difference between fuel injector volume on all fuel injectors is within specification. See FUEL INJECTOR VOLUME SPECIFICATIONS table.
6. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector is one drop or less per one minute. Replace fuel injector if leakage exceeds specification. Remove test equipment.

FUEL INJECTOR VOLUME SPECIFICATIONS

Scheme 83

Scheme 84

Note. Fuel pressure control system may also be referred to as fuel pressure-up system.

Fuel Pressure Control System

1. Fuel pressure control system uses a fuel pressure control Vacuum Switching Valve (VSV). Fuel pressure control VSV is supplied voltage through EFI main relay.
2. Engine Control Module (ECM) will activate VSV by controlling ground circuit for 90-180 seconds when restarting engine at normal operating temperature. Locate and remove fuel pressure control VSV. See «FUEL PRESSURE CONTROL VSV LOCATION»(ref-21996-S26927619702001010300000) table. NOTE: Fuel pressure control VSV may also be identified using appropriate illustration in «THEORY/OPERATION - 3.0L»(ref-21904) article and wire color. See appropriate wiring diagram in WIRING DIAGRAMS article. FUEL PRESSURE CONTROL VSV LOCATION Application Location Camry Rear VSV Below Cover On Intake Manifold, Near Pressure Regulator On Fuel Rail & Contains Blue 2-Pin Electrical Connector
3. Using ohmmeter, ensure continuity exists between electrical terminals on fuel pressure control VSV and resistance is 33-39 ohms at 68°F (20°C). Replace fuel pressure control VSV if no continuity exists or resistance is not within specification.
4. Ensure no continuity exists between each electrical terminal and body of fuel pressure control VSV. Replace fuel pressure control VSV if continuity exists between electrical terminal and body of fuel pressure control VSV.
5. Apply air pressure to designated area and check that air flows from end of fuel pressure control VSV without battery connected. (Scheme 85)
6. Apply battery voltage and ground to electric terminals on fuel pressure control VSV and reapply air pressure. Air pressure should now flow from filter. (Scheme 85) Replace fuel pressure control VSV if defective.

Scheme 85

Fuel Cut System

1. When testing fuel cut system, monitor engine RPM using scan tester. Connect scan tester to data link connector No. 3 for monitoring engine RPM. For connecting of scan tester, see appropriate application under IDLE SPEED & MIXTURE in «ADJUSTMENTS - 3.0L»(ref-21886) article.
2. Start and warm engine to normal operating temperature. Ensure A/C and all accessories are off. Gradually increase engine RPM to at least 3500 RPM.
3. Using stethoscope, check for fuel injector operating sound. Ensure when throttle lever is released, fuel injector stops operating momentarily and then resumes operating (fuel return RPM).
4. Ensure fuel return RPM is within specification. See «FUEL CUT SYSTEM SPECIFICATIONS»(ref-21996-S36372164802001010300000) table. Shut engine off. Remove test equipment.

FUEL CUT SYSTEM SPECIFICATIONS (1)

IDLE AIR CONTROL (IAC) VALVE

1. Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in «ADJUSTMENTS - 3.0L»(ref-21886) article.
2. Apply parking brake and place transmission/transaxle in Neutral. Ensure A/C is off. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 of data link connector No. 1 located in engine compartment. (Scheme 86) Start engine and note engine RPM.
3. Engine RPM should increase to 1000 RPM for 5 seconds, and then return to idle. If engine RPM is not within specification, test IAC valve resistance and IAC valve operation. If engine RPM is within specification, remove jumper wire. Turn ignition off.
4. To test IAC valve resistance, ensure ignition is off. Disconnect electrical connector from IAC valve located on lower area of throttle body. Using ohmmeter, checking resistance between +B terminal and each remaining terminal on IAC valve. (Scheme 87)
5. Replace IAC valve if resistance is not within specification. See «IAC VALVE RESISTANCE SPECIFICATIONS»(ref-21996-S21922787602001010300000) table. IAC VALVE RESISTANCE SPECIFICATIONS Application Ohms Cold (1) 17.0-24.5 Hot (2) 21.5-28.5 (1) Cold is with temperature of 14-122°F (-10-50°C). (2) Hot is with temperature of 122-212°F (50-100°C).
6. To test IAC valve operation, remove IAC valve from throttle body. Apply battery voltage to +B terminal on IAC valve. Apply battery ground to proper terminal and ensure valve opens and closes. (Scheme 79) Replace IAC valve if defective.
7. If IAC valve resistance is within specification and operates correctly, check wiring circuit between Engine Control Module (ECM) and IAC valve. See «ECM LOCATION»(ref-21996-S22486432072001010300000) table. See appropriate wiring diagram in WIRING DIAGRAMS article.

ECM LOCATION

Scheme 86

Scheme 87

Scheme 88

IGNITION SYSTEM

Note. For basic ignition checks, see BASIC TESTING - 3.0L article.

See KNOCK SENSOR under ENGINE SENSORS & SWITCHES.

See EGR GAS TEMPERATURE SENSOR in ENGINE SENSORS & SWITCHES .

EGR VACUUM MODULATOR

Note. When testing EGR vacuum modulator, it may be necessary to monitor engine RPM by using scan tester. For scan tester connections, see IDLE SPEED & MIXTURE in ADJUSTMENTS - 3.0L article.

1. Mark vacuum hose locations and disconnect vacuum hoses from EGR vacuum modulator. (Scheme 81) Block ports "P" and "R" on EGR vacuum modulator. see scheme 27 NOTE: Ports "P" and "R" are the double ports on side of EGR vacuum modulator. Port "Q" is single port on side of EGR vacuum modulator.
2. Apply air pressure to port "Q". see scheme 27 Air should flow freely through air filter side of EGR vacuum modulator.
3. Start and operate engine at 3500 RPM. Repeat test procedures in steps 1) and 2). Strong resistance of airflow should be felt. Replace EGR vacuum modulator if strong resistance is not felt. Reconnect vacuum hoses to proper locations.

EGR VACUUM SWITCHING VALVE (VSV)

1. Remove EGR VSV. (Scheme 81) Using ohmmeter, ensure continuity exists between electrical terminals on EGR VSV and resistance is 33-39 ohms at 68°F (20°C). Replace EGR VSV if no continuity exists or resistance is not within specification.
2. Ensure no continuity exists between each electrical terminal and body of EGR VSV. Replace EGR VSV if continuity exists between electrical terminal and body of EGR VSV.
3. Apply air pressure to port "E" without battery connected. (Scheme 89) Air pressure should flow from port "G".
4. Apply battery voltage and ground to electrical terminals on EGR VSV. (Scheme 89) Apply air pressure to port "E". Air pressure should now flow through air filter. Replace EGR VSV if defective.

Scheme 89

FUEL EVAPORATION SYSTEM

Note. Fuel evaporation systems contain different components depending on application. (Scheme 81) When testing fuel evaporation system components, use illustration to determine component location.

EVAP Thermal Vacuum Valve

1. Drain cooling system. Remove EVAP Thermal Vacuum Valve (TVV) from coolant passage on intake manifold. (Scheme 81)
2. Use cool water to cool threaded end of EVAP TVV to less than 104°F (40°C). Apply air pressure to top vacuum hose port on EVAP TVV. Ensure EVAP TVV is closed and no air will flow from lower vacuum hose port on EVAP TVV.
3. Heat water to greater than 138°F (59°C). Apply air pressure to top vacuum hose port on EVAP TVV. Ensure EVAP TVV is open and air flows from lower vacuum hose port on EVAP TVV. Replace EVAP TVV if defective. Apply thread sealant on threads of EVAP TVV and reinstall. Tighten EVAP TVV to 22 ft. lbs. (30 N.m). Fill cooling system.

Charcoal Canister

1. Remove charcoal canister. Check for clogged filter and/or stuck check valve by applying light air pressure to port "A". see scheme 20 Ensure air flows freely from other ports on charcoal canister.
2. Apply light air pressure to port "B". see scheme 20 Ensure no air flows from any other ports on charcoal canister. Replace charcoal canister if defective.
3. To clean charcoal canister filter, apply 43 psi (3 kg/cm 2 ) air pressure to port "A" while holding port "B" closed. Air should flow from remaining ports on charcoal canister. Ensure no activated carbon comes out of charcoal canister. DO NOT attempt to wash out charcoal canister.

Scheme 90

EVAP Check Valve

1. Remove EVAP check valve from lower hose on charcoal canister. (Scheme 81)
2. Apply air pressure to Yellow-colored side of EVAP check valve. Air should flow through EVAP check valve.
3. Apply air pressure to Black-colored side of EVAP check valve. Air should not flow through EVAP check valve. Replace EVAP check valve if defective.

POSITIVE CRANKCASE VENTILATION (PCV)

1. Remove PCV valve. Apply air pressure to PCV valve at cylinder head side of PCV valve. Ensure air flows easily through PCV valve.
2. Apply air pressure to PCV valve at intake manifold side of PCV valve. Ensure air flows through PCV valve with some resistance. Replace PCV valve if valve does not function as described.

THROTTLE OPENER

1. Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in «ADJUSTMENTS - 3.0L»(ref-21886) article.
2. Disconnect and plug vacuum hose at throttle opener located on side of throttle body. Start engine and note engine speed. Engine speed should be 900-1950 RPM.
3. If engine speed is not within specification, replace throttle body. Shut engine off. Reinstall vacuum hose on throttle opener. Start engine and ensure engine returns to proper idle speed.