Engine Controls - Basic Diagnostic Procedures - V6 & V8: Other Toyota Highlander I

PROGRAMMING

Note. Before performing basic diagnostic procedures, check for any related Technical Service Bulletins (TSBs).

POWER SLIDING DOOR REINITIALIZATION PROCEDURE

Note. Following procedure should be performed if power sliding door system does not operate properly under the 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 the 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 the battery.
3. Turn on power sliding door system by placing power sliding door main switch in the 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 the left of steering column and is marked as PWR DOOR OFF. Open one of the power sliding doors by using the power sliding door control switch. Power sliding door control switches are located near center of instrument panel, just below the stereo.
5. Wait 3 seconds after power sliding door stops at the 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 the 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 the 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 (All Models)

Warm engine to normal operating temperature before checking the compression. Ensure battery is fully charged. Remove ignition coils. See IGNITION COIL under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Remove spark plugs. On Camry and Highlander, manufacturer states to disconnect electrical connectors at fuel injectors. On all models, using compression gauge, check compression with throttle fully open. Read compression in a short a time as possible. Ensure compression is within specification. See COMPRESSION SPECIFICATIONS table. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall ignition coils.

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 the 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 18 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 the 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 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 «POWER SUN ROOF REINITIALIZATION PROCEDURE»(ref-133197-S31820680242002052400000) 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 the 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 72

1. Disconnect electrical connector for fuel pump. (Scheme 72) This is electrical connector for fuel pump and fuel gauge sending unit. Electric fuel pump is located in the 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 the 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 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-133197-S33367977452002052400000) 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 the 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 73

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-133197-S40841770462002021900000). 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 73)
3. Remove fuel pipe clamp from No. 1 fuel pipe at fuel filter. Perform STEP 1 in illustration. (Scheme 74) 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 74)
5. Install Adapter (SST 09268-41250), hose and fuel pressure gauge from Fuel Pressure Gauge Set (09268-45014) with fuel pipe connector between No. 1 fuel pipe and fuel filter. (Scheme 75) 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 1and see scheme 3. 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 13 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 the fuel tank. See «FUEL PRESSURE REGULATOR»(ref-133227-S16025386682002021900000) under FUEL SYSTEMS in REMOVAL, OVERHAUL & 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 the fuel pump by using hand-held tester or connecting battery voltage to fuel pump.

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Scheme 78

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-133197-S40841770462002021900000). 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 76)
3. Remove fuel pipe clamp from disconnect fitting at end of No. 1 fuel pipe. (Scheme 77) 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 77) Install Adapter (SST 09268-41250) and hose with fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with fuel pipe connector between No. 1 fuel pipe and fuel pipe fitting. (Scheme 78) 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 2and see scheme 4. 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-133197-S10658361782002052900000) 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 14 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 the fuel tank. See «FUEL PRESSURE REGULATOR»(ref-133227-S16025386682002021900000) under FUEL SYSTEMS in REMOVAL, OVERHAUL & 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 the 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 the 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-133197-S31820680242002052400000) under PROGRAMMING.

Land Cruiser & Sequoia

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-133197-S40841770462002021900000). 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 79) 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 79) 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 80) 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 5and see scheme 6. 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 15 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-133227-S16025386682002021900000) under FUEL SYSTEMS in REMOVAL, OVERHAUL & 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 the 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 15 On all models, reinstall remaining components.

Scheme 79

Scheme 80

Scheme 81

Scheme 82

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-133197-S40841770462002021900000). 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 73)
3. Remove fuel pipe clamp from No. 1 fuel pipe. (Scheme 81) 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 81)
5. Install adapter, hose and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with fuel pipe connector between No. 1 fuel pipe and fuel pipe fitting. (Scheme 82) 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 7 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 16 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 the fuel tank. See «FUEL PRESSURE REGULATOR»(ref-133227-S16025386682002021900000) under FUEL SYSTEMS in REMOVAL, OVERHAUL & 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 the 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-133197-S33367977452002052400000) under PROGRAMMING.

Tacoma, Tundra 3.4L V6 & 4Runner

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-133197-S40841770462002021900000).
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 83) 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 83) 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 8- see scheme 10. 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 and 4Runner, 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 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, OVERHAUL & 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 the 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 the fuel pump by using hand-held tester. On Tacoma and 4Runner, fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump to check for fuel leaks. see scheme 17

Scheme 83

Tundra 4.7L V8

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-133197-S40841770462002021900000). Disconnect negative battery cable.
2. 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 79) Intake air connector fits between throttle body and air cleaner assembly.
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 on driver's side fuel rail. (Scheme 80) Tighten adapter to 29 ft. lbs. (39 N.m).
5. Install negative battery cable. Connect Toyota hand-held tester to data link connector No. 3at driver's side of instrument panel. see scheme 9 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, OVERHAUL & 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. 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 the fuel pump by using hand-held tester. Install throttle body cover and intake air connector (if removed).

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 WIRING DIAGRAMS article.

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 (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. For operation of fuel pump relay, see FUEL PUMP RELAY & FUEL PUMP RESISTOR (SEQUOIA & TUNDRA 4.7L V8) under FUEL PUMP CONTROL CIRCUIT.

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. For operation of fuel pump relay, see FUEL PUMP RELAY & FUEL PUMP RESISTOR (SEQUOIA & TUNDRA 4.7L V8) under FUEL PUMP CONTROL CIRCUIT.

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 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 +B terminal of fuel pump Electronic Control Unit (ECU), +B and +B1 terminals of ECM and various other electrical components. For operation of fuel pump ECU and fuel pump switch, see FUEL PUMP ELECTRONIC CONTROL UNIT & FUEL PUMP SWITCH (LAND CRUISER) under FUEL PUMP CONTROL CIRCUIT. 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.

Fuel Pump Electronic Control Unit & Fuel Pump Switch (Land Cruiser)

Fuel pump operating speed is controlled by engine operating conditions such as: starting, idling, light load or heavy load. Engine Control Module (ECM) delivers an input signal from FPC terminal on ECM to FPC terminal on fuel pump Electronic Control Unit (ECU) in accordance with engine operating condition. Fuel pump ECU uses this input signal to determine how much voltage should be delivered to fuel pump for varying fuel pump operating speed.

When engine starts, or engine is under heavy load at high speeds, ECM delivers input signal of approximately 3.8 volts to fuel pump ECU. Fuel pump ECU then delivers approximately battery voltage to fuel pump and fuel pump operates at high speed. When engine is under heavy load at low speeds, ECM delivers an input signal of approximately 2.5 volts to fuel pump ECU. Fuel pump ECU then delivers approximately 10 volts to fuel pump and fuel pump operates at medium speed. When engine is idling or under light loads, ECM delivers an input signal of approximately 1.3 volts to fuel pump ECU. Fuel pump ECU then delivers approximately 8.5 volts to fuel pump and fuel pump operates at low speed. If a problem exists in fuel pump ECU or control circuit, Diagnostic Trouble Code (DTC) P1200 may be stored in ECM. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs. Fuel pump ECU is located behind inner panel, just behind driver's rear wheelwell. (Scheme 84)

Fuel pump switch is in the circuit between FPC terminal on ECM and FPC terminal on fuel pump ECU. Fuel pump switch may also be referred to as fuel pump inertia switch or fuel pump control switch. If vehicle is involved in a collision, fuel pump switch will shut off the fuel pump by opening this circuit, and not allowing any input signal to be delivered from ECM to fuel pump ECU. Fuel pump switch is located on driver's side of instrument panel. (Scheme 85) Fuel pump switch contains a reset switch which has an OFF and ON position. (Scheme 85) Continuity will exist between electrical terminals on fuel pump switch with reset switch in the ON position, and no continuity in the OFF position. Reset switch must be in ON position for fuel pump operation.

Scheme 84

Scheme 85

Fuel Pump Relay & Fuel Pump Resistor (Sequoia & Tundra 4.7L V8)

Fuel pump operating speed is controlled by operating condition of the engine such as: starting, idling, light load or heavy load. When engine is cranking and start signal is received at Engine Control Module (ECM), the ECM energizes circuit opening relay and voltage is applied to both sides of fuel pump relay. Fuel pump relay contacts are closed on one side and voltage is applied directly to fuel pump in which fuel pump operates at high speed. After engine starts during idling or light loads, fuel pump relay is energized by FPR terminal of ECM and contacts in fuel pump relay close to other side of relay. Voltage is then supplied to fuel pump by going from fuel pump relay through fuel pump resistor. Fuel pump now operates at low speed. Fuel pump relay is located in fuse/relay box at driver's side front corner of engine compartment. Fuel pump resistor is located at driver's side front corner of engine compartment, near end of fuse/relay box. (Scheme 86)

Scheme 86

IGNITION SYSTEMS

Note. All models use a distributorless ignition system.

Avalon

1. Remove ignition coils. See «IGNITION COIL»(ref-133227-S05018488112002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & 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 the 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 IG2 relay and ignition coil. See «WIRING DIAGRAMS»(ref-133228) article. 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-133222-S29798228462002021900000) 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-133197-S36123311632002021900000) . 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-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
8. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-133197-S26414468642002021900000) . 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-133227-S06839670652002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & 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) P1300, P1305, P1310, P1315, P1320 or P1325 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-133197-S12511988562002021900000) table. See «WIRING DIAGRAMS»(ref-133228) article. 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).

Camry & Highlander

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-133227-S05018488112002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. 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. 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 5 . If spark exists at all spark plugs, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m).
4. 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).
5. 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).

Camry Solara

1. Remove ignition coils. See «IGNITION COIL»(ref-133227-S05018488112002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & 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 the 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 «WIRING DIAGRAMS»(ref-133228) article.
7. Check ignition coil resistance. See «IGNITION COIL RESISTANCE»(ref-133197-S21092330792002021900000) . 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-133197-S36123311632002021900000) . 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-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
9. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-133197-S26414468642002021900000) . 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-133227-S06839670652002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & 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) P1300 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-133197-S12511988562002021900000) table. See «WIRING DIAGRAMS»(ref-133228) article. 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).

Land Cruiser, Sequoia, Sienna & Tundra 4.7L V8

1. Remove ignition coils. See «IGNITION COIL»(ref-133227-S05018488112002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & 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 the 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. See «IGNITION COIL POSITIVE TERMINAL IDENTIFICATION»(ref-133197-S17077676852002021900000) table. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coil. See «WIRING DIAGRAMS»(ref-133228) article. 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-133197-S36123311632002021900000) . 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-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
8. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-133197-S26414468642002021900000) . 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-133227-S06839670652002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & 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) P1300, P1305, P1310, P1315, P1320, P1325, P1330 or P1340 will be set in ECM memory to indicate a specified ignitor circuit malfunction. DTCs P1330 and P1340 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-133197-S12511988562002021900000) table. See «WIRING DIAGRAMS»(ref-133228) article. 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. 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 the 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 «WIRING DIAGRAMS»(ref-133228) article.
5. Check ignition coil resistance. See «IGNITION COIL RESISTANCE»(ref-133197-S21092330792002021900000) . 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-133227-S05018488112002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-133197-S36123311632002021900000) . 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-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-133197-S26414468642002021900000) . 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-133227-S06839670652002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & 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) P1300 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-133197-S12511988562002021900000) table. See «WIRING DIAGRAMS»(ref-133228) article. 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). 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-133195) article.

Scheme 87

1. Two camshaft position sensors are used. Camshaft position sensors are located at flywheel end of each cylinder head, just below valve cover. (Scheme 87) Camshaft position sensors may also be referred to Variable Valve Timing (VVT) sensors. Remove necessary components for access to electrical connector at camshaft position sensor. Disconnect electrical connector at camshaft position sensor.
2. Using ohmmeter, check resistance between electrical terminals on each camshaft position sensor. (Scheme 87) Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-133197-S15309850232002021900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Reinstall electrical connector on camshaft position sensor.

Scheme 88

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 88)
2. Using ohmmeter, check resistance between electrical terminals on camshaft position sensor. (Scheme 88) Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-133197-S15309850232002021900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Reinstall electrical connector on camshaft position sensor.

Scheme 89

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 89) 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 89)
3. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-133197-S15309850232002021900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Reinstall electrical connector for camshaft position sensor.

Scheme 90

1. Disconnect electrical connector for camshaft position sensor located near upper radiator hose. (Scheme 90) Camshaft position sensor is located behind upper timing belt cover, near passenger's side camshaft sprocket.
2. Using ohmmeter, check resistance between electrical terminals on electrical connector for camshaft position sensor. (Scheme 90) Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-133197-S15309850232002021900000) table. Replace camshaft position sensor if resistance is not within specification. See «CAMSHAFT POSITION SENSOR»(ref-133227-S23416025442002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Reinstall electrical connector for camshaft position sensor.

CAMSHAFT POSITION SENSOR RESISTANCE

Scheme 91

1. Crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. (Scheme 91)
2. Manufacturer lists inspection procedure with crankshaft position sensor removed before checking the resistance. Remove passenger's side fender apron for access to crankshaft pulley and 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-133197-S16203533792002021900000) table.
4. Reinstall crankshaft position sensor. Tighten crankshaft position sensor bolt to 71 INCH lbs. (8.0 N.m). Reinstall electrical connector on crankshaft position sensor.

1. Crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. (Scheme 91)
2. Remove necessary components for access to crankshaft pulley and crankshaft position sensor. 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-133197-S16203533792002021900000) table.

Scheme 92

1. Crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. (Scheme 92) Manufacturer lists inspection procedure with crankshaft position sensor removed before checking the 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-133197-S16203533792002021900000) 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 93

1. Crankshaft position sensor is located at front of engine, just above crankshaft pulley. (Scheme 93) Manufacturer lists inspection procedure with crankshaft position sensor removed before checking the 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-133197-S16203533792002021900000) 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. 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

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

Scheme 94

Scheme 95

Scheme 96

Scheme 97

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 94) Disconnect holder at ignition coil. Pull upward on grommet to disconnect spark plug wire from ignition coil. (Scheme 95) 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 96) 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-133197-S13128600582002021900000) table.
4. To check ignition coil secondary resistance, remove ignition coil. See «IGNITION COIL»(ref-133227-S05018488112002021900000) under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Using ohmmeter, check ignition coil secondary resistance. (Scheme 97) Replace ignition coil if ignition coil secondary resistance is not within specification. See «IGNITION COIL RESISTANCE»(ref-133197-S13128600582002021900000) 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 95) Lightly pull upward on holder to ensure lock claw is securely locked in place. IGNITION COIL RESISTANCE - Ohms Application Primary Secondary Camry Solara Aisan 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.