Engine Controls - Basic Diagnostic Procedures - 4-CYLINDER: Other Toyota MR2 W30

SERVICE PRECAUTIONS

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

PRIUS

The following service precautions must be followed

Scheme 23

1. Ensure ignition is off and ignition key is removed from ignition before performing any inspection or service procedure in engine compartment, as engine may automatically start and shut off when ignition is on and READY light is illuminated. READY light is displayed just above the shift lever position indicator on instrument cluster at center of instrument panel.
2. Read all service and warning labels in engine compartment before performing any procedures in engine compartment.
3. All high-voltage wiring harness connectors contain Orange connectors. DO NOT touch any wiring harness that contains Orange connectors.
4. High-voltage battery and other high-voltage components may be identified by HIGH VOLTAGE caution labels on them. DO NOT touch these components.
5. If necessary to inspect or service high-voltage system, ensure ignition is off. Remove service plug and wait at least 5 minutes to ensure high voltage is fully discharged before touching any high-voltage wiring harness, connectors or components. Service plug is located on service plug assembly at driver's side front corner of trunk compartment, near high-voltage battery. (Scheme 23) Ensure service plug is stored in a location in which no one may install service plug while technician is working on the vehicle.
6. If necessary to touch any high-voltage wiring harness, connectors or components, ensure service plug is removed and battery voltage or less exists at electrical connector. Use Toyota insulated gloves when touching any high-voltage wiring harness, connectors or components. Ensure insulated gloves are dry and in good condition and that no holes exist in insulated gloves. Test by applying air pressure to insulated glove before touching any high-voltage wiring harness, connectors or components.
7. DO NOT wear any metal objects while working on vehicle which may accidently drop and cause a short circuit.
8. If any high-voltage wiring harness connector is disconnected, ensure terminal on wiring harness connector is wrapped with tape to prevent wiring harness connector from contacting any surface.
9. If servicing high-voltage system, place sign on roof of vehicle to indicate to other technicians that high-voltage system is being serviced.

Camry

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.

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 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 1 second should open power sun roof. Depressing TILT UP side of power sun roof switch for 1 second should close power sun roof. To tilt power sun roof upward, depress and hold TILT UP side of power sun roof switch for 1 second. To tilt power sun roof downward, depress and hold SLIDE OPEN side of power sun roof switch for 1 second.

Celica

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.

Close power sun roof using power sun roof switch and continue to depress power sun roof switch briefly after power sun roof is fully closed. Power sun roof switch is located on headliner, just in front of power sun roof.

Compression (Camry, Camry Solara & RAV4)

1. Warm engine to normal operating temperature before checking the compression. Shut engine off. Ensure battery is fully charged.
2. Disconnect electrical connectors at fuel injectors and ignition coils. Remove ignition coils and spark plugs.
3. Check compression by inserting a compression gauge into the spark plug hole. Fully open the throttle. While the engine is cranking, read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151952-S35842765212003010900000) table.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
5. Install and tighten spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

Compression (Celica, Corolla & Matrix)

1. Warm engine to normal operating temperature before checking the compression. Shut engine off. Ensure battery is fully charged.
2. Disconnect electrical connectors at ignition coils. Remove ignition coils and spark plugs.
3. Check compression by inserting a compression gauge into the spark plug hole. Fully open the throttle. While cranking the engine, read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151952-S35842765212003010900000) table.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
5. On Celica, install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m). On Corolla and Matrix, install and tighten spark plugs to 18 ft. lbs. (25 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

Compression (ECHO)

1. Warm engine to normal operating temperature before checking the compression. Shut engine off. Ensure battery is fully charged.
2. Disconnect electrical connectors at ignition coils. Remove No. 2 cylinder head cover, ignition coils and spark plugs.
3. Check compression by inserting a compression gauge into the spark plug hole. Fully open the throttle. While cranking the engine, read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151952-S35842765212003010900000) table.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
5. Install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m). Install the No. 2 cylinder head cover and bolts.

Compression (Highlander)

1. Warm engine to normal operating temperature before checking the compression. Shut engine off. Ensure battery is fully charged.
2. Disconnect electrical connectors at fuel injectors and ignition coils. Remove ignition coils and spark plugs.
3. Check compression by inserting a compression gauge into the spark plug hole. Fully open the throttle. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151952-S35842765212003010900000) table.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
5. Install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 71 INCH lbs. (8.0 N.m).

Compression (MR2)

1. Warm engine to normal operating temperature before checking the compression. Shut engine off. Ensure battery is fully charged.
2. Disconnect electrical connectors at ignition coils. Remove ignition coils and spark plugs.
3. Check compression by inserting a compression gauge into the spark plug hole. Fully open the throttle. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151952-S35842765212003010900000) table.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
5. Install and tighten spark plugs to 19 ft. lbs. (26 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

Compression (Prius)

1. Manufacturer states procedure using Toyota hand-held tester. Warm engine to normal operating temperature. Shut engine off. Remove air cleaner assembly. Disconnect electrical connectors at ignition coils. Remove ignition coils and spark plugs.
2. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 27 Select CRANKING MODE on Toyota hand-held tester using hand-held tester instructions. Refer to Toyota hand-held tester operator's manual for further details.
3. Check compression pressure by inserting compression gauge into the spark plug hole. Fully open the throttle. Crank the engine and note the compression. While in the CRANKING MODE, cranking speed is automatically set at 250 RPM and throttle is automatically opened to fully open position. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151952-S35842765212003010900000) table. Remove hand-held tester.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
5. Install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

Compression (Tacoma)

1. Warm engine to normal operating temperature before checking the compression. Shut engine off. Remove intake air connector for access to spark plugs. Disconnect the vacuum hose from the fuel pressure regulator. Disconnect the wire clamp from engine wire. Loosen the hose clamp and remove the 2 bolts and intake air connector.
2. Disconnect electrical connectors at ignition coils. Remove ignition coils and spark plugs.
3. Check compression pressure by inserting a compression gauge into the spark plug hole. Fully open the throttle. Read compression in a short a time as possible. Ensure compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-151952-S35842765212003010900000) table.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
5. Install and tighten spark plugs to 19 ft. lbs. (14 N.m) and ignition coil retaining bolts to 66 INCH lbs. (7.5 N.m). Install the intake air connector bolts to 13 ft. lbs (18 N.m)

COMPRESSION SPECIFICATIONS

FUEL SYSTEMS

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

1. Ensure ignition is off. Remove circuit opening relay from fuse/relay box. see scheme 30 Fuse/relay box is located at driver's side front corner of engine compartment.
2. Start engine and allow to idle until it 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 appropriate «POWER SUN ROOF REINITIALIZATION PROCEDURE»(ref-151952-S39858491552003010900000) under PROGRAMMING.

Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Matrix, Prius, RAV4 & Tacoma

1. On all models, disconnect electrical connector for fuel pump. See «FUEL PUMP ELECTRICAL CONNECTOR LOCATION»(ref-151952-S16602332212003010900000) table. This is electrical connector for fuel pump and fuel gauge sending unit. Electric fuel pump is located in the fuel tank. FUEL PUMP ELECTRICAL CONNECTOR LOCATION Application Connector Location Camry Solara, Celica, Corolla, ECHO, Matrix & Prius Under Cover Plate, Below Rear Seat Cushion Highlander Under Cover Plate, Below Driver's Side & Passenger's Side Rear Seats MR2 Under Cover Plate, Below Luggage Compartment Boxes Behind The Seats RAV4 Under Cover Plate, Below Driver's Side Rear Seat Tacoma On Top Of Fuel Tank, At Fuel Pump
2. Start engine and allow engine to idle until engine stalls. Turn ignition off. 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. NOTE: On Celica, 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-151952-S39858491552003010900000) under PROGRAMMING.

Scheme 24

Scheme 25

Scheme 26

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151952-S34563865742003010900000). Disconnect negative battery cable.
2. Purchase fuel pipe (part No. 23901-28130) from parts department. Remove fuel pipe connector from end of NEW fuel pipe. (Scheme 24)
3. Remove fuel pipe clamp from end of fuel pipe at fuel pipe fitting. Perform STEP 1 in illustration. (Scheme 25) Ensure area around fuel pipe and disconnect fitting is clean.
4. Depress both tabs and pull fuel pipe with disconnect fitting from fuel pipe fitting. Perform STEP 2 in illustration. (Scheme 25) Install Fuel Pressure Gauge Set (SST 09268-45012) or (SST 09268-45014 for vehicle with Partial Zero Emission Vehicle system) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector between fuel pipe and fuel pipe fitting. (Scheme 26) Ensure hose, fuel pipe and fuel pipe connector are properly connected. Install fuel pipe clamp.
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 20 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 (CAMRY)»(ref-151952-S30999572972003010900000) 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 the fuel tank. See FUEL PRESSURE REGULATOR under FUEL SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) 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. Turn ignition off. Remove hand-held tester. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 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 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. Install fuel pipe on fuel pipe fitting. Pull on fuel pipe to ensure fuel pipe is properly locked on fuel pipe fitting. Reinstall fuel pipe clamp. Install negative battery cable. 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. 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 appropriate «POWER SUN ROOF REINITIALIZATION PROCEDURE»(ref-151952-S39858491552003010900000) under PROGRAMMING.

Scheme 27

Scheme 28

Scheme 29

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151952-S34563865742003010900000). Disconnect negative battery cable.
2. Purchase fuel pipe (part No. 23901-0H020) from parts department. This is the fuel pipe that attaches to top of fuel filter. Remove fuel pipe connector from end of NEW fuel pipe. (Scheme 27)
3. Remove fuel pipe clamp from fuel pipe at fuel filter. Perform STEP 1 in illustration. (Scheme 28) Ensure area around fuel pipe and fuel filter is clean.
4. Depress both sides of retainer and pull fuel pipe with disconnect fitting from fuel filter. Perform STEP 2 in illustration. (Scheme 28)
5. Install Fuel Pressure Gauge Set (SST 09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector between fuel pipe and fuel filter. (Scheme 29) Ensure hose, fuel pipe and fuel pipe connector are properly connected.
6. Reinstall negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 21 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 31 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 under FUEL SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) 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. Turn ignition off. Remove hand-held tester. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
10. 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.
11. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
12. Apply light coat of engine oil on tip of fuel pipe on fuel filter to allow for ease of disconnect fitting and fuel pipe installation. Using NEW retainer, install fuel pipe on fuel filter until "click" sound is heard. DO NOT reuse old retainer. Pull on fuel pipe to ensure fuel pipe is properly locked on fuel filter.
13. Reinstall fuel pipe clamp. 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 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151952-S34563865742003010900000). Disconnect negative battery cable.
2. Purchase appropriate fuel pipe from parts department. See «FUEL PIPE IDENTIFICATION»(ref-151952-S13957569262003010900000) table. Remove fuel pipe connector from end of NEW fuel pipe. (Scheme 24)and (Scheme 27). FUEL PIPE IDENTIFICATION Application Fuel Pipe Part No. Celica 1.8L 1ZZ-FE 23901-22100 1.8L 2ZZ-GE 23271-88600 Corolla & Matrix 23901-0D010 ECHO 23901-21020 MR2 23901-22070
3. Remove fuel pipe clamp from fuel pipe. Perform STEP 1 in illustration. (Scheme 30)- (Scheme 33). Ensure area around fuel pipe and disconnect fitting is clean.
4. Depress both sides of retainer and pull fuel pipe with disconnect fitting from fuel pipe fitting. Perform STEP 2 in illustration. (Scheme 30)- (Scheme 33).
5. Install Fuel Pressure Gauge Set (SST 09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector between fuel pipe and fuel pipe fitting. (Scheme 34)and (Scheme 35). Ensure hose, 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 22, see scheme 23, see scheme 24 and see scheme 26. 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 32, see scheme 33, see scheme 34, see scheme 36 and see scheme 37. 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 under FUEL SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) 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. Turn ignition off. Remove hand-held tester. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
10. 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.
11. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
12. Apply light coat of engine oil on tip of fuel pipe fitting to allow for ease of disconnect fitting and fuel pipe installation. Using NEW retainer, install fuel pipe on fuel pipe fitting until "click" sound is heard. DO NOT reuse old retainer. Pull on fuel pipe to ensure fuel pipe is properly locked on fuel pipe fitting.
13. Reinstall fuel pipe clamp. 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: On Celica, 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 power sun roof reinitialization procedure. See appropriate «POWER SUN ROOF REINITIALIZATION PROCEDURE»(ref-151952-S39858491552003010900000) under PROGRAMMING.

Scheme 36

Scheme 37

Scheme 38

Scheme 39

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151952-S34563865742003010900000). Disconnect negative battery cable.
2. Purchase fuel pipe (part No. 23901-28070 for Highlander or 23901-22110 for RAV4) from parts department. Remove fuel pipe connector from end of NEW fuel pipe. (Scheme 24)and (Scheme 36).
3. Remove fuel pipe clamp from end of fuel pipe at fuel pipe fitting. (Scheme 38)and (Scheme 39). Ensure area around fuel pipe and disconnect fitting is clean.
4. Depress both tabs and pull fuel pipe with disconnect fitting from fuel pipe fitting. (Scheme 38)and (Scheme 39). Install Fuel Pressure Gauge Set (SST 09268-45012 for Highlander and SST 09268-45014 for RAV4) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector between fuel pipe and fuel pipe fitting. (Scheme 26)and (Scheme 37). Ensure hose, fuel pipe and fuel pipe connector are properly connected. Install fuel pipe clamp.
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 25and see scheme 28. 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 connecting battery voltage to specified terminals on fuel pump. see scheme 35and see scheme 39. 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 under FUEL SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) 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. Turn ignition off. Remove hand-held tester. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 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 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. Install fuel pipe on fuel pipe fitting. Pull on fuel pipe to ensure fuel pipe is properly locked on fuel pipe fitting. Reinstall fuel pipe clamp. 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 40

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151952-S34563865742003010900000). Disconnect negative battery cable.
2. Purchase fuel pipe (part No. 23901-21020) from parts department. Remove fuel pipe connector from end of NEW fuel pipe. (Scheme 24)
3. Ensure area around fuel pipe at end of fuel rail and disconnect fitting is clean. (Scheme 40)
4. Depress both sides of retainer and pull fuel pipe with disconnect fitting from fuel pipe fitting. (Scheme 40)
5. Install Fuel Pressure Gauge Set (SST 09268-45014) by using Injection Measuring Tool Set (SST 09268-41047) and fuel pipe connector between fuel pipe and fuel pipe fitting. (Scheme 34) Ensure hose, 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 27 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 38 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, fuel pressure regulator is defective. Fuel pressure regulator is mounted on fuel pump in the fuel tank. It may be necessary to replace fuel pressure regulator, fuel pump and fuel tank as an assembly. Consult parts department for parts availability. If fuel pressure is less than specified, check for leaking fuel hoses or connections or defective fuel pump.
9. Turn ignition off. Remove hand-held tester. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
10. 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 or defective fuel injector.
11. Release fuel pressure. Disconnect negative battery cable. Remove adapter, hose, fuel pressure gauge and fuel pipe connector.
12. Apply light coat of engine oil on tip of fuel pipe fitting to allow for ease of disconnect fitting and fuel pipe installation. Using NEW retainer, install fuel pipe on fuel pipe fitting until "click" sound is heard. DO NOT reuse old retainer. Pull on fuel pipe to ensure fuel pipe is properly locked on fuel pipe fitting.
13. 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 41

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-151952-S34563865742003010900000). Disconnect negative battery cable.
2. Note location for fuel pressure gauge installation on fuel rail. (Scheme 41) Fuel pressure gauge is installed at firewall end of fuel rail, between fuel rail and fuel inlet pipe. Cover union bolt at fuel rail with shop towel. Remove union bolt with gaskets, and disconnect fuel inlet pipe from fuel rail.
3. Install fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45014) with gaskets, fuel inlet pipe and union bolt on fuel rail. (Scheme 41) Tighten union bolt to 21 ft. lbs. (29 N.m).
4. Reinstall negative battery cable. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. see scheme 29 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. 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 40 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 on fuel rail. See FUEL PRESSURE REGULATOR under FUEL SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) 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. Start engine and allow engine to idle. Note fuel pressure with engine idling.
8. Check vacuum hose routing for fuel pressure regulator mounted on 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 31-37 psi (2.2-2.6 kg/cm 2 ) with engine idling and vacuum applied, and 38-44 (2.7-3.1 psi 2.7-3.1 kg/cm 2 ) without vacuum with engine idling. 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 fuel pressure gauge. Using NEW gaskets, reinstall fuel inlet pipe on fuel rail. Tighten union bolt to 21 ft. lbs. (29 N.m). 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.

FUEL PUMP CONTROL CIRCUIT

Note. For information on testing relays and fuel system components, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article. Circuit opening relay may also be identified by appropriate illustration in SYSTEM & COMPONENT TESTING - 4-CYLINDER article. For complete wiring circuit of electrical components on a specific model, See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. For additional testing information for fuel pump control circuit, see FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.

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 (Celica, ECHO & Prius)

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 (Corolla & Matrix)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to both sides of circuit opening relay. EFI main relay may also be referred to as EFI 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 (MR2)

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 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 (RAV4)

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 to other side of circuit opening relay from IG2 fuse. 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 (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 LOCATION (1)

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. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Celica)

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, EFI No. 1 and 2 fuses, and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Corolla & Matrix)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. When ignition is turned on, voltage is supplied to other side of EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, +B terminal of Engine Control Module (ECM) and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (ECHO)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. When ignition is turned on, voltage is supplied to other side of EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, +B terminal of Engine Control Module (ECM) and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

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. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (MR2)

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. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Prius)

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. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (RAV4)

EFI main relay may also be referred to as EFI relay. EFI No. 2 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, A/F heater relay, +B terminal of ECM and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (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. When ignition is turned on, voltage is supplied through IGN fuse to other side of EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, +B terminal of Engine Control Module (ECM) and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI MAIN RELAY LOCATION

IGNITION SYSTEMS

Note. All models use a distributorless ignition system.

Camry & Camry Solara

1. Remove No. 2 cylinder head cover located on top of engine, above ignition coils and valve cover. Disconnect electrical connectors at ignition coils located on top of valve cover. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
2. 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 exists, reinstall components. On Camry and Camry Solara, tighten spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
3. 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.
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 spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See «IGNITION COIL POSITIVE TERMINAL IDENTIFICATION»(ref-151952-S03187430802003010900000) 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. IGNITION COIL POSITIVE TERMINAL IDENTIFICATION Application Wire Color Camry & Camry Solara Black/Red
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151952-S27316658832003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151952-S32307476012003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
8. Check ignition IGT signal from Engine Control Module (ECM) to ignition coil. If ignition IGT signal from ECM is defective, check ECM inputs and outputs. See «PIN VOLTAGE CHARTS»(ref-151980) article.
9. 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-151952-S09348667352003010900000) 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. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

Celica & ECHO

1. Remove No. 2 cylinder head cover located on top of engine, above ignition coils and valve cover. Disconnect electrical connectors at ignition coils located on top of valve cover. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
2. 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 exists, reinstall components. Install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
3. 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.
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. Install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See «IGNITION COIL POSITIVE TERMINAL IDENTIFICATION»(ref-151952-S15315271172003110600000) 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. NOTE: On Celica, it may be necessary to check operation of IG2 relay by using wiring diagram. 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. IG2 fuse and IG2 relay are located in fuse/relay box at driver's side front corner of engine compartment, just in front of strut tower. IGNITION COIL POSITIVE TERMINAL IDENTIFICATION Application Wire Color Celica Black ECHO Black/Red
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151952-S27316658832003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151952-S32307476012003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
8. 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 or P0354 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 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-151952-S09348667352003010900000) 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. Install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

Corolla & Matrix

1. Remove No. 2 cylinder head cover located on top of engine, above ignition coils and valve cover. Disconnect electrical connectors at ignition coils located on top of valve cover. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
2. 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 exists, reinstall components. On Corolla and Matrix (1ZZ-FE engine), install and tighten spark plugs to 18 ft. lbs. (25 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m). On Matrix (2ZZ-GE engine), install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
3. 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.
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. On Corolla and Matrix (1ZZ-FE engine), install and tighten spark plugs to 18 ft. lbs. (25 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m). On Matrix (2ZZ-GE engine), install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See «IGNITION COIL POSITIVE TERMINAL IDENTIFICATION»(ref-151952-S15247176852003110600000) 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. IGNITION COIL POSITIVE TERMINAL IDENTIFICATION Application Wire Color Corolla & Matrix Black/White
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151952-S27316658832003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151952-S32307476012003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
8. 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 or P1315 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 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-151952-S09348667352003010900000) 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. On Corolla and Matrix (1ZZ-FE engine), install and tighten spark plugs to 18 ft. lbs. (25 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m). On Matrix (2ZZ-GE engine), install and tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

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 No. 2 cylinder head cover located on top of engine, above ignition coils and valve cover. Disconnect electrical connectors at ignition coils located on top of valve cover. Remove retaining bolts and ignition coils from valve cover. 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 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
4. Install substitute spark plug for spark plug which did not fire 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 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 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 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

MR2

1. Remove suspension upper braces. Suspension upper brace fits between firewall and top of each strut tower. Remove No. 2 cylinder head cover located on top of engine, above ignition coils and valve cover. Disconnect electrical connectors at ignition coils mounted on valve cover. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
2. 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 exists, reinstall components. Tighten spark plugs to 19 ft. lbs. (25 N.m), ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m), No. 2 cylinder head cover nuts to 62 INCH lbs. (7.0 N.m), suspension upper brace nuts to 59 ft. lbs. (80 N.m) and suspension upper brace bolts to 55 ft. lbs. (74 N.m).
3. 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.
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 spark plugs to 19 ft. lbs. (25 N.m), ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m), No. 2 cylinder head cover nuts to 62 INCH lbs. (7.0 N.m), suspension upper brace nuts to 59 ft. lbs. (80 N.m) and suspension upper brace bolts to 55 ft. lbs. (74 N.m).
5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between IG2 relay and ignition coil. 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 under MODULES, MOTORS, RELAYS & SOLENOIDS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-151978) article. IG2 fuse is located in fuse/relay box at driver's side rear corner of engine compartment, just in front of strut tower. IG2 relay is located in relay box on firewall at driver's side front corner of engine compartment.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151952-S27316658832003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151952-S32307476012003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
8. 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 or P0354 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 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-151952-S09348667352003010900000) 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 19 ft. lbs. (25 N.m), ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m), No. 2 cylinder head cover nuts to 62 INCH lbs. (7.0 N.m), suspension upper brace nuts to 59 ft. lbs. (80 N.m) and suspension upper brace bolts to 55 ft. lbs. (74 N.m).

1. Remove air cleaner assembly for access to ignition coils located on top of valve cover. Disconnect electrical connectors at ignition coils. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
2. 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 exists, reinstall components. Tighten spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
3. 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.
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 spark plugs to 13 ft. lbs. (18 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
5. 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 appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. AM2 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, consult wiring diagram for relay testing. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. AM2 fuse and IG2 relay are located in fuse/relay box at driver's side front corner of engine compartment.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151952-S27316658832003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151952-S32307476012003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
8. 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 or P1315 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 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-151952-S09348667352003010900000) 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) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).

RAV4

1. Remove air cleaner assembly for access to ignition coils located on top of valve cover. Disconnect electrical connectors at ignition coils. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
2. 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 exists, reinstall components. Tighten spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
3. 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.
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 spark plugs to 14 ft. lbs. (19 N.m) and ignition coil retaining bolts to 80 INCH lbs. (9.0 N.m).
5. 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 appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. IGN fuse supplies constant battery voltage to one side of IG2 relay. When ignition is turned on, voltage is supplied from ignition switch, through IG2 fuse and 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 under MODULES, MOTORS, RELAYS & SOLENOIDS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-151978) article. IGN fuse and IG2 relay are located in fuse/relay box at driver's side front corner of engine compartment. IG2 fuse is located in fuse box behind driver's side of instrument panel.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151952-S27316658832003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151952-S32307476012003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
8. 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 or P1315 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 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-151952-S09348667352003010900000) 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. (19 N.m) and ignition coil bolts to 80 INCH lbs. (9.0 N.m).

Tacoma

1. Remove necessary components for access to ignition coils located on top of valve cover. Disconnect electrical connectors at ignition coils. Remove retaining bolts and ignition coils from valve cover. Remove spark plugs. Install spark plug on each ignition coil. Reinstall electrical connectors on ignition coils.
2. 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 exists, reinstall components. Tighten spark plugs to 15 ft. lbs. (20 N.m) and ignition coil retaining bolts to 66 INCH lbs. (7.5 N.m).
3. 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.
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 spark plugs to 15 ft. lbs. (20 N.m) and ignition coil retaining bolts to 66 INCH lbs. (7.5 N.m).
5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal (Black/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check Black/Red wire between ignition switch and ignition coil. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR»(ref-151952-S27316658832003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-151952-S32307476012003010900000) . 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 under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
8. 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 or P0354 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 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-151952-S09348667352003010900000) 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 15 ft. lbs. (20 N.m) and ignition coil retaining bolts to 66 INCH lbs. (7.5 N.m). ENGINE CONTROL MODULE LOCATION Model (1) Location Camry & Camry Solara Behind Glove Box Celica In Engine Compartment, Below Cover, Just In Front Of Battery, Next To Driver's Side Strut Tower Corolla & Matrix Behind Stereo On Instrument Panel, Just In Front Of Center Console ECHO & Highlander Behind Glove Box MR2 On Inside Of Firewall, Directly Behind Driver's Seat & Luggage Compartment Prius Behind Glove Box RAV4 Near Passenger's Side Kick Panel, Just Below Instrument Panel Tacoma Behind Glove Box (1) For illustration of ECM location, see «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-151978) article.

Camry, Camry Solara, ECHO & Highlander

1. Camshaft position sensor may also be referred to Variable Valve Timing (VVT) sensor. Disconnect electrical connector at camshaft position sensor. Camshaft position sensor is located on end of cylinder head at flywheel end of engine, just at end of intake camshaft. (Scheme 42)and (Scheme 43). Using ohmmeter, check resistance between electrical terminals on camshaft position sensor.
2. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S25417695732003010900000) table. Replace camshaft position sensor if resistance is not within specification. See CAMSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall electrical connector on camshaft position sensor.

Celica, Corolla & Matrix

1. Camshaft position sensor may also be referred to Variable Valve Timing (VVT) sensor. Disconnect electrical connector at camshaft position sensor. Camshaft position sensor is located just above intake manifold on cylinder head, at flywheel end of engine. (Scheme 44)and (Scheme 45). Using ohmmeter, check resistance between electrical terminals on camshaft position sensor.
2. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S25417695732003010900000) table. Replace camshaft position sensor if resistance is not within specification. See CAMSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall electrical connector on camshaft position sensor.

1. Camshaft position sensor may also be referred to Variable Valve Timing (VVT) sensor. Camshaft position sensor is located just above intake manifold on cylinder head, at flywheel end of engine. (Scheme 46)
2. Manufacturer recommends removing camshaft position sensor from cylinder head before checking the resistance. Remove camshaft position sensor. See CAMSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
3. Using ohmmeter, check resistance between electrical terminals on camshaft position sensor. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S25417695732003010900000) table. Replace camshaft position sensor if resistance is not within specification. Reinstall camshaft position sensor.

Prius & RAV4

1. Camshaft position sensor may also be referred to Variable Valve Timing (VVT) sensor. Disconnect electrical connector at camshaft position sensor. Camshaft position sensor is located on end of cylinder head at flywheel end of engine. (Scheme 47)and (Scheme 48). Using ohmmeter, check resistance between electrical terminals on camshaft position sensor.
2. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S25417695732003010900000) table. Replace camshaft position sensor if resistance is not within specification. See CAMSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall electrical connector on camshaft position sensor.

1. Disconnect electrical connector at camshaft position sensor. Camshaft position sensor is located on cylinder head, just in front of intake manifold. (Scheme 49) Using ohmmeter, check resistance between electrical terminals on camshaft position sensor.
2. Ensure camshaft position sensor resistance is within specification. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S25417695732003010900000) table. Replace camshaft position sensor if resistance is not within specification. See CAMSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall electrical connector on camshaft position sensor.

CAMSHAFT POSITION SENSOR RESISTANCE

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Camry, Camry Solara & Highlander

1. Disconnect crankshaft position sensor electrical connector at crankshaft position sensor. Crankshaft position sensor is located on front of timing chain cover. (Scheme 50)and (Scheme 51).
2. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor electrical connector. Ensure crankshaft position sensor resistance is within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S13130405882003010900000) table. Replace crankshaft position sensor if resistance is not within specification. See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall crankshaft position sensor electrical connector.

1. Crankshaft position sensor is located on front of engine, near crankshaft pulley. (Scheme 52)
2. Manufacturer recommends removing crankshaft position sensor before checking the resistance. Manufacturer states intake manifold must be removed for removal of crankshaft position sensor. Remove crankshaft position sensor. See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) 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-151952-S13130405882003010900000) table. Reinstall crankshaft position sensor.

ECHO

1. Remove passenger's side engine cover for access to crankshaft pulley. Disconnect crankshaft position sensor electrical connector at crankshaft position sensor. Crankshaft position sensor is located on front of engine, near crankshaft pulley. (Scheme 53)
2. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. Ensure crankshaft position sensor resistance is within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S13130405882003010900000) table. Replace crankshaft position sensor if resistance is not within specification. See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall crankshaft position sensor electrical connector.

1. Remove lower front engine cover. Remove A/C compressor for access to crankshaft position sensor. It may be necessary to discharge A/C system for removal of A/C compressor. Crankshaft position sensor is located on front of timing chain cover, near crankshaft pulley. (Scheme 54)
2. Disconnect crankshaft position sensor electrical connector. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor electrical connector. Ensure crankshaft position sensor resistance is within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S13130405882003010900000) table. Replace crankshaft position sensor if resistance is not within specification. See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall crankshaft position sensor electrical connector and A/C compressor. Tighten A/C compressor retaining bolts to 18 ft. lbs. (24 N.m). Install lower front engine cover.

1. Remove passenger's side engine cover for access to crankshaft pulley. Disconnect crankshaft position sensor electrical connector at crankshaft position sensor. Crankshaft position sensor is located on front of engine, near crankshaft pulley. (Scheme 55)
2. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. Ensure crankshaft position sensor resistance is within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S13130405882003010900000) table. Replace crankshaft position sensor if resistance is not within specification. See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall crankshaft position sensor electrical connector and passenger's side engine cover.

1. Disconnect crankshaft position sensor electrical connector located near front of engine. (Scheme 51) Crankshaft position sensor is located on timing chain cover, near crankshaft pulley.
2. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor electrical connector. Ensure crankshaft position sensor resistance is within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S13130405882003010900000) table. Replace crankshaft position sensor if resistance is not within specification. See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS in «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article. Reinstall crankshaft position sensor electrical connector.

1. Crankshaft position sensor is located near crankshaft pulley, just above oil pan on driver's side of engine. (Scheme 56)
2. Manufacturer recommends removing crankshaft position sensor before checking the resistance. See CRANKSHAFT «REMOVAL & INSTALLATION - 4-CYLINDER»(ref-151983) article.
3. Using ohmmeter, check resistance between NE- and NE+ terminals on crankshaft position sensor. (Scheme 56) Replace crankshaft position sensor if resistance is not within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-151952-S13130405882003010900000) table. Reinstall crankshaft position sensor.

CRANKSHAFT POSITION SENSOR RESISTANCE

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

All Models

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

IDLE SPEED & IGNITION TIMING

Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ON-VEHICLE ADJUSTMENTS - 4-CYLINDER 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.