Engine Controls - Basic Diagnostic Procedures - V6 & V8: Other Toyota Avalon XX20 рестайлинг

POWER SLIDING DOOR REINITIALIZATION PROCEDURE

Note. Following procedure should be performed if power sliding door system does not operate properly under following conditions: battery is disconnected and reconnected, battery is discharged and recharged, or open power sliding door warning light remains on even with power sliding doors closed.

Sienna

1. If power sliding door system does not operate properly and open power sliding door warning light remains on, even with power sliding doors closed, go to next step. If power sliding door system does not operate properly after battery is disconnected and reconnected or battery is discharged and recharged, go to step 4 .
2. Ensure power sliding door main switch is in OFF position. Power sliding door main switch is located on driver's side of instrument panel, just to left of steering column and is marked as PWR DOOR OFF. Close power sliding door by hand. Disconnect battery for one minute and then reconnect battery.
3. Turn on power sliding door system by placing power sliding door main switch in ON position. Wait 5 seconds and then go to next step.
4. Ensure power sliding door main switch is in ON position if not previously done. Power sliding door main switch is located on driver's side of instrument panel, just to left of steering column and is marked as PWR DOOR OFF. Open one of power sliding doors by using power sliding door control switch. Power sliding door control switches are located near center of instrument panel, just below stereo.
5. Wait 3 seconds after power sliding door stops at fully open position and then close power sliding door by using power sliding door control switch on instrument panel or by using remote keyless entry transmitter.
6. Wait 3 seconds after power sliding door stops at fully closed position and then repeat steps 4 and 5 .

POWER SUN ROOF REINITIALIZATION PROCEDURE

Note. Following procedure should be performed if battery is disconnected and reconnected, or battery is discharged and recharged to provide proper automatic operation and jam protection operation of power sun roof.

Camry

1. Ensure ignition is on. Depress and hold TILT UP side of power sun roof switch until power sun roof tilts all way upward and then tilts downward a little. Power sun roof switch is located on headliner, just in front of power sun roof.
2. Check for proper operation of open/closing and tilt up/down function for power sun roof using power sun roof switch. Power sun roof should operate anytime ignition is on, or for 43 seconds after ignition is off provided both front doors are closed. Power sun roof will stop operating if any front door is opened. Depressing SLIDE OPEN side of power sun roof switch for one second should open power sun roof. Depressing TILT UP side of power sun roof switch for one second should close power sun roof. To tilt power sun roof upward, depress and hold TILT UP side of power sun roof switch for one second. To tilt power sun roof downward, depress and hold SLIDE OPEN side of power sun roof switch for one second.

Compression (Avalon, Camry Solara, Land Cruiser, Sequoia, Tacoma & Tundra)

1. Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged.
2. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs.
3. Fully open throttle and using compression gauge, check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151953-S03181113732003010900000) table.
4. If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
5. On Avalon, Camry Solara and Tacoma, install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 71 INCH lbs. (8 N.m). On Land Cruiser, Sequoia and Tundra 4.7L V8, install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 66 INCH lbs. (7.5 N.m). On Tundra 3.4L V6, install and tighten spark plugs to 14 ft. lbs. (20 N.m). Reinstall and tighten ignition coils to 71 INCH lbs. (8 N.m).

Compression (Camry)

1. Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged. Disconnect injector connectors.
2. Remove intake air surge tank. Disconnect throttle position sensor connector, throttle control motor sensor connector, Exhaust Gas Recirculation (EGR) gas temperature sensor connector and EGR valve position sensor connector. Disconnect 2 water bypass hoses and purge hose. Disconnect hoses and cables. Remove 4 nuts, EGR pipe and 2 gaskets. Remove 2 bolts and No. 1 engine hanger. Remove 2 bolts and surge tank stay No. 1. Disconnect engine wire from emission control valve set. Using an 8 mm socket wrench, remove 2 bolts, 2 nuts and intake air surge tank. (Scheme 22)
3. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs.
4. Fully open throttle and using compression gauge (SST 09992-00500), check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151953-S03181113732003010900000) table.
5. If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
6. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 71 INCH lbs. (8 N.m).
7. Install and tighten air intake chamber assembly bolts and nuts to 32 ft. lbs. (43 N.m). Install and tighten No. 1 engine hanger bolts to 29 ft. lbs. (39 N.m). Install and tighten surge tank stay No. 1 bolts to 14 ft. lbs. (20 N.m). Install EGR pipe nuts to 9 ft. lbs. (12 N.m).

Scheme 22

Compression (Highlander)

1. Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged. Disconnect injector connectors.
2. Remove intake air surge tank. Disconnect accelerator cable. Remove bolt, and disconnect speed control cable with bracket. Disconnect throttle position sensor connector and Idle Air Control (IAC) valve connector Remove 3 bolts and disconnect power steering pressure tube from intake air surge tank, throttle body bracket and No. 1 engine hanger. Disconnect 2 water bypass hoses and No. 6 air hose. Disconnect purge hose. Disconnect hoses and cables. Remove 2 bolts and No. 1 engine hanger. Remove 2 bolts and throttle body bracket. Disconnect engine wire from emission control valve set. Using an 8 mm socket hexagon wrench, remove 2 bolts, 2 nuts and intake air surge tank. (Scheme 23)
3. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs.
4. Fully open throttle. Using Compression Gauge (SST 09992-00500), check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151953-S03181113732003010900000) table.
5. If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
6. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 71 INCH lbs. (8 N.m).

Scheme 23

Compression (Sienna)

1. Remove outer front cowl top panel assembly. Remove hood and 2 wiper arm head caps. Remove 2 nuts and wiper arm and blade assemblies. Remove head to cowl top seal and cowl panel hole cover. Remove clip and disconnect window washer hose and remove cowl top ventilator louver. Remove RH and LH ventilator louvers. Remove 11 bolts and disconnect wiper motor connector and remove cowl top ventilator louver.
2. Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged.
3. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs.
4. Fully open throttle and using compression gauge, check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151953-S03181113732003010900000) table.
5. If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
6. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 71 INCH lbs. (8 N.m). Install outer front cowl top panel assembly and tighten wiper arm and blade assembly nuts to 15 ft. lbs. (20.5 N.m).

Compression (4Runner 4.0L V6)

1. Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged.
2. Remove V-bank cover and air cleaner assembly.
3. Remove intake air surge tank. Disconnect 2 water bypass hoses, fuel vapor feed hose and ventilation hose. Disconnect 2 vacuum switching valve (VSV) connectors and throttle body w/motor connector. (Scheme 24) Separate 3 wire harness clamps and hose clamp. Remove 2 bolts and throttle body bracket. Remove bolt and oil baffle plate. Remove 4 bolts and 2 surge tank stays. Remove 2 nuts. Using a 8 mm socket hexagon wrench, remove 4 bolts, intake air surge tank and gasket.
4. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs. Disconnect injector connectors.
5. Fully open throttle and using compression gauge, check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151953-S03181113732003010900000) table.
6. If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
7. Connect injector connectors. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 66 INCH lbs. (7.5 N.m).
8. Install and tighten intake air surge tank bolts and nuts to 21 ft. lbs. (28 N.m). Install and tighten surge tank stay bolts to 15 ft. lbs. (21 N.m). Install and tighten oil baffle plate bolt to 80 INCH lbs. (9 N.m). Install and tighten throttle body bracket bolts to 16 ft. lbs. (21 N.m). Install air cleaner assembly and V-bank cover.

Scheme 24

Compression (4Runner 4.7L V8)

1. Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged.
2. Remove throttle body cover sub-assembly and air cleaner hose assembly. Disconnect throttle control motor connector.
3. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs. Disconnect injector connectors.
4. Fully open throttle and using compression gauge, check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151953-S03181113732003010900000) table.
5. If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
6. Connect injector connectors. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 66 INCH lbs. (7.5 N.m). Connect throttle control motor connector. Install air cleaner hose assembly and throttle body cover sub-assembly.

COMPRESSION SPECIFICATIONS

FUEL SYSTEMS

Basic diagnosis of fuel system should begin by checking fuel pump operation and fuel pressure.

Avalon & Camry Solara

1. Remove rear seat cushion, cover plate on floor panel and remaining necessary covers for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit. Electric fuel pump is located in fuel tank.
2. Start engine and allow engine to idle until engine stalls. Turn ignition off. Reinstall electrical connector for fuel pump, necessary covers, cover plate and rear seat cushion. Disconnect negative battery cable.
3. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen or disconnect fuel line connection, allowing fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced. Reinstall electrical connector for fuel pump and negative battery cable.

1. Ensure ignition is off. Remove circuit opening relay from fuse/relay box. see scheme 22 Fuse/relay box is located at driver's side front corner of engine compartment.
2. Start engine and allow engine to idle until engine stalls. Attempt to start engine again to ensure engine will not start. Turn ignition off. Disconnect negative battery cable. Remove fuel tank cap to release any pressure from fuel tank.
3. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen or disconnect fuel line connection, allowing fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced.
4. Reinstall circuit opening relay and negative battery cable. Start engine and check operation of Malfunction Indicator Light (MIL) on instrument panel with engine running. MIL is displayed as engine icon on instrument panel. It may be possible that Diagnostic Trouble Code (DTC) P0171 may have been stored in Engine Control Module (ECM) and MIL may be illuminated with engine running due to lean condition caused by operating engine with circuit opening relay removed. If MIL is illuminated, DTCs must be cleared from ECM. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. NOTE: It is possible that power sun roof may not operate properly after battery was disconnected. If power sun roof does not operate properly, perform appropriate power sun roof reinitialization procedure. See «POWER SUN ROOF REINITIALIZATION PROCEDURE»(ref-151953-S01894670482003010900000) under PROGRAMMING.

Highlander

1. Remove driver's side and passenger's side rear seats and cover plate on floor panel for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit. Electric fuel pump is located in fuel tank.
2. Start engine and allow engine to idle until engine stalls. Turn ignition off. Reinstall electrical connector for fuel pump, cover plate and rear seats. Disconnect negative battery cable.
3. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen or disconnect fuel line connection, allowing fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced. Reinstall electrical connector for fuel pump and negative battery cable.

Scheme 25

1. Disconnect electrical connector for fuel pump. (Scheme 25) This is electrical connector for fuel pump and fuel gauge sending unit. Electric fuel pump is located in fuel tank. Start engine and allow engine to idle until engine stalls. Turn ignition off.
2. Disconnect negative battery cable. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen or disconnect fuel line connection, allowing fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced. Reinstall electrical connector for fuel pump and negative battery cable.

Sequoia, Tacoma & Tundra

1. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit and is located on top of fuel tank, near fuel pump. Electric fuel pump is located in fuel tank. It may be necessary to lower fuel tank for access to electrical connector for fuel pump. On Tacoma models with rear seats, it may be possible to access electrical connector for fuel pump by removing driver's side rear seat cushion and cover plate on floor panel.
2. On all models, start engine and allow engine to idle until engine stalls. Turn ignition off. Disconnect negative battery cable. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen or disconnect fuel line connection, allowing fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced. Reinstall electrical connector for fuel pump and negative battery cable.

1. Disconnect negative battery cable. Place container below fuel line connection at fuel filter. Cover fuel line connection with shop towel.
2. Slowly loosen or disconnect fuel line connection, allowing fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced. Reinstall negative battery cable after service procedures are performed. NOTE: It is possible that power sliding doors may not operate properly after battery was disconnected. It may be necessary to perform power sliding door reinitialization procedure to obtain proper sliding door operation. See «POWER SLIDING DOOR REINITIALIZATION PROCEDURE»(ref-151953-S03289710692003010900000) under PROGRAMMING.

4Runner

1. Remove driver's side rear seat cushion and cover plate on floor panel for access to electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit. Electric fuel pump is located in fuel tank. Start engine and allow engine to idle until engine stalls. Turn ignition off.
2. Disconnect negative battery cable. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen fuel line connection or disconnect fuel line connection, allowing any fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced. Reinstall electrical connector for fuel pump and negative battery cable.

Scheme 26

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151953-S32042019032003010900000). Disconnect negative battery cable.
2. On Avalon, purchase No. 1 fuel pipe (part No. 23801-20070) from parts department. On Camry Solara, purchase No. 1 fuel pipe (part No. 23801-20041) from parts department. On all models, No. 1 fuel pipe is fuel pipe that attaches to top of fuel filter. Remove fuel pipe connector from end of NEW No. 1 fuel pipe. (Scheme 26)
3. Remove fuel pipe clamp from No. 1 fuel pipe at fuel filter. Perform STEP 1 in illustration. (Scheme 27)or (Scheme 29). Ensure area around No. 1 fuel pipe and fuel filter is clean.
4. Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel filter. Perform STEP 2 in illustration. (Scheme 27)or (Scheme 29).
5. Install Fuel Pressure Gauge Set (09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector. (Scheme 28)or (Scheme 30). Ensure hose, No. 1 fuel pipe and fuel pipe connector are properly connected.
6. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 4and see scheme 6. Turn ignition on. DO NOT start engine.
7. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. If hand-held tester is not available, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 17 Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
8. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted on fuel pump in fuel tank. See «FUEL PRESSURE REGULATOR»(ref-151984-S14766275472003010900000) under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
9. Remove hand-held tester from data link connector No. 3. Start engine and note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure is within specification and holds as specified, go to next step. If fuel pressure is not within specification or does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
10. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
11. Apply light coat of engine oil on tip of fuel pipe on fuel filter to allow for ease of disconnect fitting and No. 1 fuel pipe installation. Using NEW retainer, install No. 1 fuel pipe on fuel filter until "click" sound is heard. DO NOT reuse old retainer. Pull on No. 1 fuel pipe to ensure fuel pipe is properly locked on fuel filter.
12. Reinstall fuel pipe clamp until "click" sound is heard. Pull upward on fuel pipe clamp to ensure fuel pipe clamp is securely locked on fuel filter. Install negative battery cable. Check for fuel leaks by activating fuel pump by using hand-held tester or connecting battery voltage to fuel pump.

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151953-S32042019032003010900000). Disconnect negative battery cable.
2. On Camry, purchase No. 1 fuel pipe (part No. 23801-20140) from parts department. On Highlander, purchase No. 1 fuel pipe (part No. 23801-20120) from parts department. On all models, No. 1 fuel pipe is fuel pipe that attaches to fuel rail. Remove fuel pipe connector from end of NEW No. 1 fuel pipe. (Scheme 31)
3. Remove fuel pipe clamp from disconnect fitting at end of No. 1 fuel pipe. (Scheme 32) Ensure area around No. 1 fuel pipe and disconnect fitting is clean.
4. Depress both tabs and pull No. 1 fuel pipe with disconnect fitting from fuel pipe fitting. (Scheme 32) Install Fuel Pressure Gauge (SST 09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector. (Scheme 33) Ensure hose, No. 1 fuel pipe and fuel pipe connector are properly connected.
5. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 5and see scheme 7. Turn ignition on. DO NOT start engine.
6. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. On Camry, if hand-held tester is not available, fuel pump may also be activated by removing circuit opening relay and connecting battery voltage to wiring circuit for fuel pump. See «CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP (CAMRY)»(ref-151953-S41548934682003010900000) procedure under FUEL PUMP OPERATION. On Highlander, if hand-held tester is not available, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 18 On all models, fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
7. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted on fuel pump in fuel tank. See «FUEL PRESSURE REGULATOR»(ref-151984-S14766275472003010900000) under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
8. Remove hand-held tester from data link connector No. 3. Start engine and note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure is within specification and holds as specified, go to next step. If fuel pressure is not within specification or does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
9. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
10. Install No. 1 fuel pipe on fuel pipe fitting. Pull on No. 1 fuel pipe to ensure No. 1 fuel pipe is properly locked on fuel pipe fitting. Reinstall fuel pipe clamp. Install negative battery cable. On Camry, check for fuel leaks by activating fuel pump by using hand-held tester or by removing circuit opening relay and connecting battery voltage to wiring circuit for fuel pump. On Highlander, check for fuel leaks by activating fuel pump by using hand-held tester or connecting battery voltage to fuel pump. NOTE: On Camry, it may be possible that power sun roof may not operate properly after battery was disconnected. If power sun roof does not operate properly, perform appropriate power sun roof reinitialization procedure. See appropriate «POWER SUN ROOF REINITIALIZATION PROCEDURE»(ref-151953-S01894670482003010900000) under PROGRAMMING.

Land Cruiser & Sequoia

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151953-S32042019032003010900000). Disconnect negative battery cable.
2. On Land Cruiser, remove intake manifold cover located on top of engine, above intake manifold and intake air connector for access to front fuel pipe at front of driver's side fuel rail (if necessary). (Scheme 34) Intake air connector fits between throttle body and air cleaner assembly. On Sequoia, remove throttle body cover and intake air connector for access to front fuel pipe at front of driver's side fuel rail (if necessary). (Scheme 34) Intake air connector fits between throttle body and air cleaner assembly.
3. On all models, cover union bolt at front fuel pipe at front of driver's side fuel rail with shop towel. Remove union bolt with gaskets, and disconnect front fuel pipe from front of driver's side fuel rail. It may be necessary to remove retaining bolt at center of front fuel pipe when disconnecting front fuel pipe from driver's side fuel rail.
4. Install Union (SST 90405-06167), Adapter (SST 09268-41190) and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with front fuel pipe on driver's side fuel rail. (Scheme 35) Tighten adapter to 29 ft. lbs. (39 N.m).
5. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 12and see scheme 14. Turn ignition on. DO NOT start engine.
6. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. On Land Cruiser, if hand-held tester is not available, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 19 On all models, fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ).
7. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted near center of passenger's side fuel rail. See «FUEL PRESSURE REGULATOR»(ref-151984-S14766275472003010900000) under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
8. Remove hand-held tester from data link connector No. 3. Start engine. Note fuel pressure with engine idling. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ).
9. Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure holds as specified, go to next step. If fuel pressure does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
10. Release fuel pressure. Disconnect negative battery cable. Remove adapter, union and fuel pressure gauge from driver's side fuel rail. Using NEW gaskets, install front fuel pipe on driver's side fuel rail. Tighten union bolt to 29 ft. lbs. (39 N.m) and retaining bolt for front fuel pipe (if loosened) to 66 INCH lbs. (7.5 N.m).
11. Install negative battery cable. Check for fuel leaks by activating fuel pump by using hand-held tester. On Land Cruiser, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump to check for fuel leaks. see scheme 19 On all models, reinstall remaining components.

Scheme 34

Scheme 35

Scheme 36

Scheme 37

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151953-S32042019032003010900000). Disconnect negative battery cable.
2. Purchase No. 1 fuel pipe (part No. 23801-20070) from parts department. Remove fuel pipe connector from end of NEW No. 1 fuel pipe. (Scheme 26)
3. Remove fuel pipe clamp from No. 1 fuel pipe. (Scheme 36) Ensure area around No. 1 fuel pipe and disconnect fitting is clean.
4. Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel pipe fitting. (Scheme 36)
5. Install Fuel Pressure Gauge (SST 09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector. (Scheme 37) Ensure hose, No. 1 fuel pipe and fuel pipe connector are properly connected.
6. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 8 Turn ignition on. DO NOT start engine.
7. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. If hand-held tester is not available, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 20 Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
8. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted on fuel pump in fuel tank. See «FUEL PRESSURE REGULATOR»(ref-133227-S16025386682002021900000) under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
9. Remove hand-held tester from data link connector No. 3. Start engine and note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure is within specification and holds as specified, go to next step. If fuel pressure is not within specification or does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
10. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
11. Apply light coat of engine oil on tip of fuel pipe fitting to allow for ease of disconnect fitting and No. 1 fuel pipe installation. Using NEW retainer, install No. 1 fuel pipe on fuel pipe fitting until "click" sound is heard. DO NOT reuse old retainer. Pull on No. 1 fuel pipe to ensure fuel pipe is properly locked on fuel pipe fitting.
12. Reinstall fuel pipe clamp until "click" sound is heard. Pull upward on fuel pipe clamp to ensure fuel pipe clamp is securely locked on fuel pipe fitting. Install negative battery cable. Check for fuel leaks by activating fuel pump by using hand-held tester or connecting battery voltage to fuel pump. NOTE: It may be possible that power sliding doors may not operate properly after battery was disconnected. It may be necessary to perform power sliding door reinitialization procedure to obtain proper sliding door operation. See «POWER SLIDING DOOR REINITIALIZATION PROCEDURE»(ref-151953-S03289710692003010900000) under PROGRAMMING.

Tacoma & Tundra 3.4L V6

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151953-S32042019032003010900000).
2. Disconnect negative battery cable. Remove bolts, upper timing belt cover and gasket for access to fuel pipe at front of driver's side fuel rail for installation of fuel pressure gauge. (Scheme 38) Cover union bolt on fuel pipe at front of driver's side fuel rail with shop towel. Remove union bolt with gaskets, and disconnect fuel pipe from front of driver's side fuel rail.
3. Install gaskets, union, union bolt and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with fuel pipe on driver's side fuel rail. (Scheme 38) Tighten union bolt to 25 ft. lbs. (34 N.m).
4. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 9- see scheme 11. Turn ignition on. DO NOT start engine.
5. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. On Tacoma, if hand-held tester is not available, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 21 On all models, fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ).
6. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted at firewall end of driver's side fuel rail. See «FUEL PRESSURE REGULATOR»(ref-133227-S16025386682002021900000) under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
7. Turn ignition off. Remove hand-held tester from data link connector No. 3. Reinstall No. 2 timing belt cover. Tighten bolts to 80 INCH lbs. (9.0 N.m). Start engine and allow engine to idle. Note fuel pressure with engine idling.
8. Check vacuum hose routing for fuel pressure regulator mounted at firewall end of driver's side fuel rail to determine if fuel pressure regulator is vacuum controlled. If vacuum hose is connected to engine vacuum and not vented to air cleaner assembly, fuel pressure regulator is vacuum controlled. If vacuum hose is vented to air cleaner assembly and not to engine vacuum, fuel pressure regulator is not vacuum controlled. On models with vacuum controlled fuel pressure regulator, fuel pressure should be 33-38 psi (2.3-2.7 kg/cm 2 ) with engine idling and vacuum applied, and 38-44 (2.7-3.1 psi 2.7-3.1 kg/cm 2 ) with engine idling without vacuum applied. On models without vacuum controlled fuel pressure regulator, fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ) with engine idling. On all models, if fuel pressure is within specification, go to next step. If fuel pressure is not within specification, check for defective vacuum hose (vacuum controlled fuel pressure regulator) or fuel pressure regulator.
9. Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure is within specification and holds as specified, go to next step. If fuel pressure is not within specification or does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
10. Release fuel pressure. Disconnect negative battery cable. Remove upper timing belt cover. Remove union bolt, union and fuel pressure gauge from driver's side fuel rail. Using NEW gaskets, install fuel pipe on driver's side fuel rail. Tighten union bolt to 25 ft. lbs. (34 N.m). Reinstall upper timing belt cover. Tighten bolts to 80 INCH lbs. (9.0 N.m).
11. Install negative battery cable. Check for fuel leaks by activating fuel pump by using hand-held tester. On Tacoma, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump to check for fuel leaks. see scheme 21

Scheme 38

Tundra 4.7L V8 & 4Runner 4.7L V8

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151953-S32042019032003010900000). Disconnect negative battery cable.
2. Remove front fuel pipe from driver's side fuel rail. On Tundra, remove throttle body cover and intake air connector for access to front fuel pipe at front of driver's side fuel rail (if necessary). (Scheme 34) Intake air connector fits between throttle body and air cleaner assembly. On 4Runner, remove throttle body cover sub-assembly, air cleaner hose assembly and front fuel pipe. (Scheme 39)
3. Cover union bolt at front fuel pipe at front of driver's side fuel rail with shop towel. Remove union bolt with gaskets, and disconnect front fuel pipe from front of driver's side fuel rail. It may be necessary to remove retaining bolt at center of front fuel pipe when disconnecting front fuel pipe from driver's side fuel rail.
4. Install Union (SST 90405-06167), Adapter (SST 09268-41190) and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with front fuel pipe to driver's side fuel rail with 3 lower gaskets. (Scheme 35) Tighten adapter to 29 ft. lbs. (39 N.m).
5. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 10 Turn ignition on. DO NOT start engine.
6. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ).
7. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted near center of passenger's side fuel rail. See «FUEL PRESSURE REGULATOR»(ref-133227-S16025386682002021900000) under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
8. Remove hand-held tester from data link connector No. 3. Start engine. Note fuel pressure with engine idling. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ).
9. Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure holds as specified, go to next step. If fuel pressure does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
10. Release fuel pressure. Disconnect negative battery cable. Remove union, adapter and fuel pressure gauge from driver's side fuel rail. Using NEW gaskets, install front fuel pipe on driver's side fuel rail. Reverse removal procedure for installation of components. Tighten union bolts to 29 ft. lbs. (39 N.m). On Tundra 4.7L V8, tighten retaining bolt for front fuel pipe (if loosened) to 66 INCH lbs. (7.5 N.m). On 4Runner 4.7L V8, tighten throttle body cover sub-assembly bolts to 66 INCH lbs. (7.5 N.m)
11. Install negative battery cable. Check for fuel leaks by activating fuel pump by using hand-held tester. Install throttle body cover and intake air connector (if removed).

Scheme 39

4Runner 4.0L V6

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151953-S32042019032003010900000). Disconnect negative battery cable.
2. Purchase No. 1 fuel pipe (part No. 23801-30170) from parts department. No. 1 fuel pipe is fuel pipe that attaches to fuel rail. Remove fuel pipe connector from end of NEW No. 1 fuel pipe. (Scheme 31)
3. Remove fuel pipe clamp from disconnect fitting at end of No. 1 fuel pipe. (Scheme 40) Ensure area around No. 1 fuel pipe and disconnect fitting is clean.
4. Depress both tabs and pull No. 1 fuel pipe with disconnect fitting from fuel pipe fitting. (Scheme 40) Install Fuel Pressure Gauge (SST 09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector. (Scheme 41) Ensure hose, No. 1 fuel pipe and fuel pipe connector are properly connected.
5. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 11 Turn ignition on. DO NOT start engine.
6. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump and note fuel pressure. If hand-held tester is not available, fuel pump may also be activated by removing circuit opening relay and connecting battery voltage to wiring circuit for fuel pump. See «CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP (4RUNNER)»(ref-151953-S36041438212003111100000) procedure under FUEL PUMP OPERATION. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
7. If fuel pressure is within specification, go to next step. If fuel pressure exceeds specification, replace fuel pressure regulator mounted on fuel pump in fuel tank. See «FUEL PRESSURE REGULATOR»(ref-151984-S14766275472003010900000) under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. If fuel pressure is less than specified, check for leaking fuel hoses or connections, restricted fuel filter, defective fuel pump or defective fuel pressure regulator.
8. Remove hand-held tester from data link connector No. 3. Start engine and note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). Shut engine off and note fuel pressure. Fuel pressure should remain at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure is within specification and holds as specified, go to next step. If fuel pressure is not within specification or does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
9. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
10. Install No. 1 fuel pipe on fuel pipe fitting. Pull on No. 1 fuel pipe to ensure No. 1 fuel pipe is properly locked on fuel pipe fitting. Reinstall fuel pipe clamp. Install negative battery cable. Check for fuel leaks by activating fuel pump by using hand-held tester or by removing circuit opening relay and connecting battery voltage to wiring circuit for fuel pump.

Scheme 40

Scheme 41

FUEL PUMP CONTROL CIRCUIT

Note. For information on testing relays and fuel system components, see SYSTEM & COMPONENT TESTING - V6 & V8 article. Circuit opening relay is used on all models except Land Cruiser. Circuit opening relay may be identified by appropriate illustration in SYSTEM & COMPONENT TESTING - V6 & V8 article. For complete wiring circuit of electrical components on a specific model, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Circuit Opening Relay (Avalon)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, EFI main relay provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied from ignition switch to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Camry)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IG2 fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Camry Solara & Highlander)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Land Cruiser)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump through fuel pump relay for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Sequoia)

Circuit opening relay controls fuel pump circuit by supplying voltage to fuel pump relay. When EFI main relay is energized, EFI main relay provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN No. 1 fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump relay which supplies voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Sienna & Tacoma)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Tundra 3.4L V6)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to both sides of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Tundra 4.7L V8)

Circuit opening relay controls fuel pump circuit by supplying voltage to fuel pump relay. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump relay which supplies voltage for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (4Runner)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump through fuel pump relay for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

CIRCUIT OPENING RELAY LOCATION (1)

EFI Main Relay (Avalon)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, EFI No. 2 fuse, +B terminal of ECM and various other electrical components. EFI main relay and EFI No. 2 fuse are located in fuse/relay box at driver's side front corner of engine compartment.

EFI Main Relay (Camry & Camry Solara)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. EFI main relay and EFI fuse are located in fuse/relay box at driver's side front corner of engine compartment.

EFI Main Relay (Highlander)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. EFI main relay and EFI fuse are located in fuse/relay box at driver's side front corner of engine compartment, just in front of strut tower.

EFI Main Relay (Land Cruiser)

EFI main relay may also be referred to as EFI relay or ECD relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI fuse may also be referred to as ECD fuse. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B and +B2 terminals of ECM and various other electrical components. EFI main relay and EFI fuse are located in fuse/relay box at driver's side front corner of engine compartment.

EFI Main Relay (Sequoia)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to +B and +B1 terminals of ECM, circuit opening relay, EFI No. 2 fuse and various other electrical components. EFI main relay, EFI No. 1 and 2 fuses are located in fuse/relay box at driver's side front corner of engine compartment.

EFI Main Relay (Sienna & Tacoma)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. EFI main relay and EFI fuse are located in fuse/relay box at driver's side front corner of engine compartment.

EFI Main Relay (Tundra 3.4L V6)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. EFI main relay and EFI No. 1 fuse are located in fuse/relay box at driver's side front corner of engine compartment.

EFI Main Relay (Tundra 4.7L V8)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B and +B1 terminals of ECM, EFI No. 2 fuse and various other electrical components. EFI main relay, EFI No. 1 and 2 fuses are located in fuse/relay box at driver's side front corner of engine compartment.

EFI Main Relay (4Runner)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. EFI main relay and EFI fuse are located in fuse/relay box at driver's side front corner of engine compartment.

IGNITION SYSTEMS

Note. All models use a distributorless ignition system.

Avalon

1. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
2. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
3. Ground spark plugs against cylinder block. Crank engine and check for spark. Spark test is based on assumption that spark plugs are okay. If spark does not exist, go to next step. If spark exist, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
4. Check ignition coil electrical connections. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
5. Install different ignition coil on spark plug and recheck for spark. If spark still does not exist, go to next step. If spark now exists with different ignition coil, replace original ignition coil. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
6. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/White wire). If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coils. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. IG2 fuse supplies constant battery voltage to one side of IG2 relay. When ignition is turned on, voltage is supplied from ignition switch to other side of IG2 relay and IG2 relay is then energized. When IG2 relay is energized, IG2 relay provides battery voltage to ignition coils and fuel injectors. If necessary to check operation of IG2 relay, see «IG2 RELAY»(ref-151979-S39146835902003010900000) under MODULES, MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - V6 & V8 article. IG2 fuse and IG2 relay are located in fuse/relay box at driver's side front corner of engine compartment.
7. Check resistance of camshaft position sensors. See «CAMSHAFT POSITION SENSOR»(ref-151953-S24948814632003010900000) . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
8. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151953-S32927524702003010900000) . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
9. Check ignition IGT signal from Engine Control Module (ECM) to ignition coil. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0351, P0352, P0353, P0354, P0355 or P0356 will be set in ECM memory to indicate an ignitor circuit malfunction. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
10. If ignition IGT signal is okay, substitute another ignition coil and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignition coil. See «ENGINE CONTROL MODULE LOCATION»(ref-151953-S20733611362003010900000) table. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).

1. Check for any Diagnostic Trouble Codes (DTC). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs. If no DTCs exist, go to next step. If any DTCs exist, perform service procedure for DTC.
2. Drain coolant. Remove RH front fender apron seal, V-bank cover sub-assembly, radiator hose inlet, front suspension upper brace center (w/ front suspension brace upper center) and air cleaner assembly with hose. Remove intake air surge tank as follows: Disconnect throttle position sensor connector, throttle control motor sensor connector, EGR gas temperature sensor connector and EGR valve position sensor connector. Disconnect 2 water bypass hoses, purge hose and hoses and cables. Remove 4 nuts, EGR pipe and 2 gaskets. Remove 2 bolts and No. 1 engine hanger. Remove 2 bolts and surge tank stay No. 1. Disconnect engine wire from emission control valve set. Using an 8-mm socket hexagon wrench, remove 2 bolts, 2 nuts and intake air surge tank. (Scheme 22)
3. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Using a 16-mm plug wrench, remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
4. Disconnect electrical connectors at fuel injectors. Ground spark plugs against cylinder block. Crank engine and check for spark. If spark exists only at some spark plugs and not at other spark plugs, go to next step. If spark does not exist at any spark plug, go to step 6. If spark exists at all spark plugs, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
5. Install substitute spark plug in which spark does not exist and recheck for spark. If spark now exists, replace original spark plug. If spark still does not exist, replace ignition coil. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
6. Install substitute spark plugs and recheck for spark. If spark now exists, replace original spark plugs. If spark still does not exist, replace ignition coil that does not produce spark. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m). Tighten ignition coils to 71 INCH lbs. (8 N.m).

Camry Solara

1. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
2. Reinstall electrical connectors and spark plug wires on ignition coils. Remove spark plugs. Install spark plug on each ignition coil and each spark plug wire.
3. Ground spark plugs against cylinder block. Crank engine and check for spark. Spark test is based on assumption that spark plugs are okay. If spark does not exist at all spark plugs, go to next step. If spark exists at all spark plugs, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
4. If spark exists at spark plug on ignition coil, but not on spark plug on spark plug wire, go to next step. If spark does not exist on any spark plug, check ignition coil and ignitor electrical connections. Ignitor is located in engine compartment, near driver's side strut tower. If electrical connections are okay, go to step 6 . If electrical connections are defective, repair as necessary and recheck for spark.
5. Using ohmmeter, check resistance of spark plug wire. Replace spark plug wire if resistance exceeds 25,000 ohms and recheck for spark.
6. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire) and ignitor positive terminal (Black/Red wire). If battery voltage exists at ignition coils and ignitor, go to next step. If battery voltage does not exist at ignition coil or ignitor, check wiring between ignition switch, ignition coil and ignitor as necessary. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
7. Check ignition coil resistance. See «IGNITION COIL RESISTANCE»(ref-151953-S36237315972003010900000) . If ignition coil resistance is within specification, go to next step. If ignition coil resistance is not within specification, replace ignition coil. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
8. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151953-S24948814632003010900000) . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
9. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151953-S32927524702003010900000) . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
10. Check ignition IGT signal from Engine Control Module (ECM) to ignitor. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0351 will be set in ECM memory to indicate an ignitor circuit malfunction. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
11. If ignition IGT signal is okay, substitute another ignitor and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignitor. See «ENGINE CONTROL MODULE LOCATION»(ref-151953-S20733611362003010900000) table. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).

1. Check for any Diagnostic Trouble Codes (DTC). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs. If no DTCs exist, go to next step. If any DTCs exist, perform service procedure for DTC.
2. Drain coolant. Remove RH front fender apron seal, V-bank cover sub-assembly, radiator hose inlet, front suspension upper brace center (w/ front suspension brace upper center) and air cleaner assembly with hose. Remove intake air surge tank as follows: Disconnect accelerator cable. Remove bolt, and disconnect speed control cable with bracket. Disconnect throttle position sensor connector and IAC valve connector. Remove 3 bolts and disconnect power steering pressure tube from intake air surge tank, throttle body bracket and No. 1 engine hanger. Disconnect 2 water bypass hoses, No. 2 air hose, purge hose and hoses and cables. Remove 2 bolts and No. 1 engine hanger. Remove 2 bolts and throttle body bracket. Disconnect engine wire from emission control valve set. Using an 8-mm socket hexagon wrench, remove 2 bolts, 2 nuts and intake surge tank. (Scheme 23)
3. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Using a 16-mm plug wrench, remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
4. Disconnect electrical connectors at fuel injectors. Ground spark plugs against cylinder block. Crank engine and check for spark. If spark exists only at some spark plugs and not at other spark plugs, go to next step. If spark does not exist at any spark plug, go to step 6. If spark exists at all spark plugs, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
5. Install substitute spark plug in which spark does not exist and recheck for spark. If spark now exists, replace original spark plug. If spark still does not exist, replace ignition coil. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
6. Install substitute spark plugs and recheck for spark. If spark now exists, replace original spark plugs. If spark still does not exist, replace ignition coil that does not produce spark. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m). Tighten ignition coils to 71 INCH lbs. (8 N.m).

Land Cruiser, Sequoia, Sienna & Tundra V8

1. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
2. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
3. Disconnect electrical connectors at fuel injectors. Ground spark plugs against cylinder block. Crank engine and check for spark. Spark test is based on assumption that spark plugs are okay. If spark does not exist, go to next step. If spark exists, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m). On Sienna, tighten ignition coils to 69 INCH lbs. (8 N.m). On all other models, tighten ignition coils to 66 INCH lbs. (7.5 N.m).
4. Check ignition coil electrical connections. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
5. Install different ignition coil on spark plug and recheck for spark. If spark still does not exist, go to next step. If spark now exists with different ignition coil, replace original ignition coil. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m). On Sienna, tighten ignition coils to 69 INCH lbs. (8 N.m). On all other models, tighten ignition coils to 66 INCH lbs. (7.5 N.m).
6. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See «IGNITION COIL POSITIVE TERMINAL IDENTIFICATION»(ref-151953-S07493841692003010900000) table. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coil. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. On Sequoia, it may be necessary to check IGN No. 2 fuse, as this fuse is in wiring circuit between ignition switch and ignition coil. IGN No. 2 fuse may also be referred to as IGN2 fuse and is located in fuse block behind driver's side of instrument panel. IGNITION COIL POSITIVE TERMINAL IDENTIFICATION Application Wire Color Land Cruiser, Sequoia & Tundra Black/Red Sienna Black/White
7. On all models, check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151953-S24948814632003010900000) . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
8. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151953-S32927524702003010900000) . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
9. Check ignition IGT signal from Engine Control Module (ECM) to ignition coil. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0351, P0352, P0353, P0354, P0355, P0356, P0357 or P0358 will be set in ECM memory to indicate a specified ignitor circuit malfunction. DTCs P0357 and P0358 apply only to Land Cruiser, Sequoia and Tundra 4.7L V8. On all models, see TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
10. If ignition IGT signal is okay, substitute another ignition coil and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignition coil. See «ENGINE CONTROL MODULE LOCATION»(ref-151953-S20733611362003010900000) table. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m). On Sienna, tighten ignition coils to 69 INCH lbs. (8 N.m). On all other models, tighten ignition coils to 66 INCH lbs. (7.5 N.m).

Tacoma

1. Disconnect spark plug wires from spark plugs. Remove spark plugs and install spark plug on each spark plug wire. Ground spark plug against cylinder block.
2. Crank engine and check for spark. Spark test is based on assumption that spark plugs are okay. If spark does not exist, check ignition coil and ignitor electrical connections. Ignitor is located at passenger's side front corner of engine compartment, near airflow meter and air cleaner assembly. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
3. Using ohmmeter, check resistance of spark plug wire. Replace spark plug wire if resistance exceeds 25,000 ohms and recheck for spark.
4. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire) and ignitor positive terminal (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch, ignition coil and ignitor. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
5. Check ignition coil resistance. See «IGNITION COIL RESISTANCE»(ref-151953-S36237315972003010900000) . If ignition coil resistance is within specification, go to next step. If ignition coil resistance is not within specification, replace ignition coil. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151953-S24948814632003010900000) . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151953-S32927524702003010900000) . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
8. Check ignition IGT signal from Engine Control Module (ECM) to ignitor. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0300, P0301, P0302, P0303, P0304, P0305 and P0306 will be set in ECM memory to indicate an ignitor circuit malfunction. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
9. If ignition IGT signal is okay, substitute another ignitor and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignitor. See «ENGINE CONTROL MODULE LOCATION»(ref-151953-S20733611362003010900000) table. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m). Tighten ignition coils to 69 INCH lbs. (7.8 N.m).

Tundra V6

1. Remove ignition coils. Remove spark plugs. Install spark plugs to each ignition coil and connect ignition coil connector. Ground spark plug against cylinder block.
2. Crank engine and check for spark. Spark test is based on assumption that spark plugs are okay. If spark does not exist, check ignition coil and ignitor electrical connections. Ignitor is located at passenger's side front corner of engine compartment, near airflow meter and air cleaner assembly. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
3. Using ohmmeter, check resistance of spark plug wire. Replace spark plug wire if resistance exceeds 25,000 ohms and recheck for spark.
4. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire) and ignitor positive terminal (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch, ignition coil and ignitor. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
5. Check ignition coil resistance. See «IGNITION COIL RESISTANCE»(ref-151953-S36237315972003010900000) . If ignition coil resistance is within specification, go to next step. If ignition coil resistance is not within specification, replace ignition coil. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151953-S24948814632003010900000) . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151953-S32927524702003010900000) . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
8. Check ignition IGT signal from Engine Control Module (ECM) to ignitor. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0351 will be set in ECM memory to indicate an ignitor circuit malfunction. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
9. If ignition IGT signal is okay, substitute another ignitor and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignitor. See «ENGINE CONTROL MODULE LOCATION»(ref-151953-S20733611362003010900000) table. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components. Tighten spark plugs to 14 ft. lbs. (20 N.m). Tighten ignition coils to 70 INCH lbs. (8 N.m).

1. Check for any Diagnostic Trouble Codes (DTC). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs. If no DTCs exist, go to next step. If any DTCs exist, perform service procedure for DTC.
2. Remove ignition coils. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs. Install spark plugs to each ignition coil and connect ignition coil connectors. Disconnect injector connectors. Ground spark plug against cylinder block.
3. Crank engine and check for spark. Spark test is based on assumption that spark plugs are okay. If spark does not exist, check ignition coil and ignitor electrical connections. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
4. Install different ignition coil on spark plug and recheck for spark. If spark still does not exist, go to next step. If spark now exists with different ignition coil, replace original ignition coil. Reinstall components. Tighten ignition coils to 66 INCH lbs. (7.5 N.m). Tighten spark plugs to 14 ft. lbs. (18 N.m).
5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire) and ignitor positive terminal (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch, ignition coil and ignitor. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151953-S24948814632003010900000) . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151953-S32927524702003010900000) . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
8. Check ignition IGT signal from Engine Control Module (ECM) to ignitor. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0351, P0352, P0353, P0354, P0355, P0356, P0357 or P0358 will be set in ECM memory to indicate an ignitor circuit malfunction. DTCs P0357 and P0358 apply only to 4Runner V8. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
9. If ignition IGT signal is okay, substitute another ignitor and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignitor. See «ENGINE CONTROL MODULE LOCATION»(ref-151953-S20733611362003010900000) table. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components. Tighten ignition coils to 66 INCH lbs. (7.5 N.m). Tighten spark plugs to 14 ft. lbs. (18 N.m). ENGINE CONTROL MODULE LOCATION Model (1) Location Avalon Behind Glove Box, Near Passenger's Side Kick Panel Camry, Camry Solara & Highlander Behind Glove Box Land Cruiser Above Glove Box, Near Passenger's Side Of Instrument Panel Sequoia & Tundra Behind Glove Box & Heater Duct Sienna Passenger's Side Of Instrument Panel, Just Below Glove Box Tacoma & 4Runner Behind Glove Box (1) For illustration of ECM location, see «THEORY & OPERATION»(ref-151951) article.

Scheme 42

1. Two camshaft position sensors are used. Camshaft position sensors are located at flywheel end of each cylinder head, just below valve cover. (Scheme 42) Camshaft position sensors may also be referred to Variable Valve Timing (VVT) sensors. Remove components for access to electrical connector at camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Disconnect electrical connector at camshaft position sensor.
2. Using ohmmeter, check resistance between electrical terminals on each camshaft position sensor. (Scheme 42) Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S38598467272003010900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Reinstall components and electrical connector on camshaft position sensor.

Scheme 43

1. Disconnect electrical connector at camshaft position sensor. Camshaft position sensor is located at flywheel end of front (radiator side) cylinder head, just below valve cover. (Scheme 43)
2. Using ohmmeter, check resistance between electrical terminals on camshaft position sensor. (Scheme 43) Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S38598467272003010900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Reinstall electrical connector on camshaft position sensor.

Scheme 44

1. Camshaft position sensor is located behind driver's side upper timing belt cover with electrical connector near front of upper timing belt cover. (Scheme 44) On Land Cruiser, remove intake manifold cover located on top of engine, above intake manifold for access to electrical connector for camshaft position sensor.
2. On all models, disconnect electrical connector at camshaft position sensor. Using ohmmeter, check resistance between electrical terminals on electrical connector for camshaft position sensor. (Scheme 44)
3. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S38598467272003010900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Reinstall electrical connector for camshaft position sensor.

Scheme 45

1. Disconnect electrical connector for camshaft position sensor located near upper radiator hose. (Scheme 45) Camshaft position sensor is located behind upper timing belt cover, near passenger's side camshaft sprocket. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
2. Using ohmmeter, check resistance between electrical terminals on electrical connector for camshaft position sensor. (Scheme 45) Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S38598467272003010900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Reinstall electrical connector for camshaft position sensor.

Scheme 46

Scheme 47

Scheme 48

1. Disconnect electrical connector for camshaft position sensor. (Scheme 46)- (Scheme 48). Remove camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
2. Using ohmmeter, check resistance between electrical terminals on electrical connector for camshaft position sensor. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S38598467272003010900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-151984-S41283511992003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Reinstall electrical connector for camshaft position sensor. CAMSHAFT POSITION SENSOR RESISTANCE Application Ohms Avalon & Camry Cold (1) 835-1400 Hot (2) 1060-1645 Camry Solara Denso Sensor (3) Cold (1) 835-1400 Hot (2) 1060-1645 Wabash Sensor (3) Cold (1) 1690-2560 Hot (2) 2145-3010 Highlander, Land Cruiser, Sequoia, Sienna, Tacoma, Tundra & 4Runner Cold (1) 835-1400 Hot (2) 1060-1645 (1) Cold is with temperature of 14-122°F (-10-50°C). (2) Hot is with temperature of 122-212°F (50-100°C). (3) This is manufacturer of camshaft position sensor.

Scheme 49

1. Crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. (Scheme 49)
2. Manufacturer lists inspection procedure with crankshaft position sensor removed before checking resistance. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
3. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S25305758302003010900000) table. Replace crankshaft position sensor if resistance is not within specification.
4. Reinstall crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Tighten crankshaft position sensor bolt to 71 INCH lbs. (8.0 N.m).

Camry & Highlander

1. Crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. (Scheme 49)
2. Remove necessary components for access to crankshaft pulley and crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Disconnect electrical connector at crankshaft position sensor. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. Replace crankshaft position sensor if resistance is not within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S25305758302003010900000) table.

Scheme 50

1. Crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. (Scheme 50) Manufacturer lists inspection procedure with crankshaft position sensor removed before checking resistance.
2. Remove lower engine cover for access to crankshaft position sensor. Disconnect electrical connector at crankshaft position sensor. Remove bolt and crankshaft position sensor.
3. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. Replace crankshaft position sensor if resistance is not within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S25305758302003010900000) table.
4. Reinstall crankshaft position sensor. Tighten crankshaft position sensor bolt to 58 INCH lbs. (6.6 N.m). Reinstall electrical connector and lower engine cover.

Scheme 51

1. Crankshaft position sensor is located at front of engine, just above crankshaft pulley. (Scheme 51) Manufacturer lists inspection procedure with crankshaft position sensor removed before checking resistance.
2. Remove lower engine cover for access to crankshaft position sensor. Disconnect electrical connector at crankshaft position sensor. Remove bolt and crankshaft position sensor.
3. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. Replace crankshaft position sensor if resistance is not within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S25305758302003010900000) table.
4. Reinstall crankshaft position sensor. Tighten crankshaft position sensor bolt to 69 INCH lbs. (7.8 N.m). Reinstall electrical connector and lower engine cover.

Scheme 52

Scheme 53

1. Crankshaft position sensor is located at front of engine, just above crankshaft pulley. (Scheme 52)and (Scheme 53). Manufacturer lists inspection procedure with crankshaft position sensor removed before checking resistance.
2. Remove crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article.
3. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. Replace crankshaft position sensor if resistance is not within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151953-S25305758302003010900000) table.
4. Reinstall crankshaft position sensor. On 4Runner 4.0L V6, tighten crankshaft position sensor bolt to 80 INCH lbs. (9.0 N.m). On 4Runner 4.7L V8, tighten crankshaft position sensor bolt to 58 INCH lbs. (6.5 N.m). See «CRANKSHAFT POSITION SENSOR»(ref-151984-S37404572492003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. CRANKSHAFT POSITION SENSOR RESISTANCE Application Ohms All Models Cold (1) 1630-2740 Hot (2) 2065-3225 (1) Cold is with temperature of 14-122°F (-10-50°C). (2) Hot is with temperature of 122-212°F (50-100°C).

Avalon, Camry, Highlander, Land Cruiser, Sequoia, Sienna, Tundra 4.7L V8 & 4Runner

Ignition coil test procedure and resistance are not available from manufacturer.

Scheme 54

Scheme 55

Scheme 56

Scheme 57

1. To check ignition coil primary resistance, remove necessary components for access to ignition coil. Disconnect electrical connector at ignition coil.
2. To disconnect spark plug wire at ignition coil, use screwdriver to lift lock claw upward. (Scheme 54) Disconnect holder at ignition coil. Pull upward on grommet to disconnect spark plug wire from ignition coil. (Scheme 55) DO NOT pull on spark plug wire.
3. Using ohmmeter, check ignition coil primary resistance between positive (+) and negative (-) electrical terminals on ignition coil. (Scheme 56) These are electrical terminals on ignition coil that electrical connector was installed on. Replace ignition coil if ignition coil primary resistance is not within specification. See «IGNITION COIL RESISTANCE»(ref-151953-S26102359002003010900000) table.
4. To check ignition coil secondary resistance, remove ignition coil. See «IGNITION COIL»(ref-151984-S18546097782003010900000) under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Using ohmmeter, check ignition coil secondary resistance. (Scheme 57) Replace ignition coil if ignition coil secondary resistance is not within specification. See «IGNITION COIL RESISTANCE»(ref-151953-S26102359002003010900000) table.
5. Reinstall ignition coil. When installing spark plug wire on ignition coil, ensure spline on ignition coil aligns with spline on holder and install spark plug wire. Ensure holder is properly positioned on grommet and ignition coil. (Scheme 55) Lightly pull upward on holder to ensure lock claw is securely locked in place. IGNITION COIL RESISTANCE - Ohms Application Primary Secondary Camry Solara Asian Ign. Coil (1) Cold (2).70-.94 10,800-14,900 Hot (3).85-1.10 13,100-17,500 Diamond Ign. Coil (1) Cold (2).70-.94 6800-11,700 Hot (3).85-1.10 8600-13,700 Tacoma, Tundra 3.4L V6 & 4Runner Cold (2).67-1.05 9300-16,000 Hot (3).85-1.23 11,700-18,800 (1) This is manufacturer of ignition coil. (2) Cold is with temperature of 14-122°F (-10-50°C). (3) Hot is with temperature of 122-212°F (50-100°C).

IDLE SPEED & IGNITION TIMING

Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ON-VEHICLE ADJUSTMENTS - V6 & V8 article.

SUMMARY

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