Engine Controls - Basic Testing - 4-CYL: Other Toyota Camry XV20

Compression (Camry, Celica, Corolla, RAV4 & Tercel)

Warm engine to normal operating temperature before checking the compression. Disconnect electrical connector(s) at ignition coil(s). Check engine mechanical condition with a compression gauge, vacuum gauge, or engine analyzer. See engine analyzer manual for specific instructions. See COMPRESSION SPECIFICATIONS table. Install and tighten spark plugs to 13 ft. lbs. (18 N.m).

Compression (Tacoma, T100 & 4Runner)

1. Warm engine to normal operating temperature before checking the compression. Remove intake air connector for access to spark plugs if necessary. Intake air connector fits between air cleaner hose and the throttle body.
2. Disconnect electrical connectors at ignition coils. Check engine mechanical condition with a compression gauge, vacuum gauge, or engine analyzer. See engine analyzer manual for specific instructions. See «COMPRESSION SPECIFICATIONS»(ref-22526-S14232900882001010300000) table. Install and tighten spark plugs to 15 ft. lbs. (20 N.m).

COMPRESSION SPECIFICATIONS

* PLEASE READ FIRST *

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

FUEL PRESSURE RELEASE

1. Disconnect electrical connector for electric fuel pump. See «FUEL PUMP ELECTRICAL CONNECTOR LOCATION»(ref-22526-S31110438642001010300000) table. Electric fuel pump is located in the fuel tank. FUEL PUMP ELECTRICAL CONNECTOR LOCATION Application Connector Location Camry, Celica & Corolla Under Cover Plate, Below Rear Seat RAV4 Under Cover Plate, Below Driver's Side Rear Seat Tacoma On Top Of Fuel Tank, At Fuel Pump Tercel Under Cover Plate, Below Rear Seat T100 On Top Of Fuel Tank, Near Fuel Pump 4Runner 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 fuel line connection, allowing fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced.

Camry

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-22526-S05268160872001010300000) under FUEL SYSTEM. Disconnect negative battery cable.
2. Note location for fuel pressure gauge installation on fuel filter. (Scheme 17) Remove union bolt with gaskets, and disconnect fuel inlet hose from fuel filter.
3. Install fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45012) with fuel inlet hose, gaskets and union bolt on fuel filter. (Scheme 17) Tighten union bolt to 21 ft. lbs. (29 N.m).
4. Reconnect negative battery cable. Install scan tool on data link connector No. 3. see scheme 1-8. Turn ignition on. DO NOT start engine.
5. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 9-16.
6. 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 REMOVE/INSTALL/OVERHAUL 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 scan tool from data link connector No. 3. Start engine and allow engine to idle. Note fuel pressure with engine idling. Fuel pressure should be within specification. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ).
8. 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 fuel pressure gauge. Using NEW gaskets, reinstall fuel inlet hose on fuel filter. Tighten union bolt to 21 ft. lbs. (29 N.m).
10. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Celica

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-22526-S05268160872001010300000) under FUEL SYSTEM. Disconnect negative battery cable.
2. Note location for fuel pressure gauge installation on fuel filter. (Scheme 17) Remove union bolt with gaskets, and disconnect fuel inlet hose from fuel filter.
3. Install fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45012) with fuel inlet hose, gaskets and union bolt on fuel filter. (Scheme 17) Tighten union bolt to 21 ft. lbs. (29 N.m).
4. Reconnect negative battery cable. Install scan tool on data link connector No. 3. see scheme 1-8. Turn ignition on. DO NOT start engine.
5. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ). NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 9-16.
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 REMOVE/INSTALL/OVERHAUL 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 scan tool from data link connector No. 3. Start engine and allow engine to idle. Disconnect and plug vacuum line at fuel pressure regulator. Note fuel pressure. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ).
8. Reconnect vacuum hose on fuel pressure regulator and note fuel pressure with engine idling. Fuel pressure should be 33-38 psi (2.3-2.7 kg/cm 2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, check for defective vacuum hose 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 hose on fuel filter. Tighten union bolt to 21 ft. lbs. (29 N.m).
11. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Scheme 17

Scheme 18

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-22526-S05268160872001010300000) under FUEL SYSTEM. Disconnect negative battery cable.
2. Purchase fuel pipe Part No. (23901-22010) from parts department. Remove fuel pipe connector from end of NEW fuel pipe. (Scheme 18)
3. Remove fuel pipe clamp from end of fuel pipe at end of fuel rail. Perform STEP 1. (Scheme 19) Ensure area around fuel pipe and disconnect fitting is clean. CAUTION: Use care when disconnecting fuel pipe, as some residual fuel pressure may still exist in the fuel system.
4. Depress both sides of retainer and pull fuel pipe with disconnect fitting from fuel pipe fitting. Perform STEP 2. (Scheme 19)
5. Install adapter, hose and fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45012) with fuel pipe connector between fuel pipe and fuel pipe fitting. (Scheme 20) Ensure hose, fuel pipe and fuel pipe connector are properly connected.
6. Install negative battery cable. Connect scan tool to data link connector No. 3. see scheme 1-8. Turn ignition on. DO NOT start engine.
7. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 9-16.
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 REMOVE/INSTALL/OVERHAUL 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 scan tool from data link connector No. 3. 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. CAUTION: DO NOT reuse old retainer when installing fuel pipe on fuel pipe fitting. Always use a NEW retainer.
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 the old retainer. Pull on fuel pipe to ensure fuel pipe is properly locked on the fuel pipe fitting.
13. Reinstall fuel pipe clamp. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Scheme 19

Scheme 20

RAV4

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-22526-S05268160872001010300000) under FUEL SYSTEM. Disconnect negative battery cable.
2. Note location for fuel pressure gauge installation on fuel filter. (Scheme 17) Remove air cleaner assembly and fuse/relay box at driver's side front corner of engine compartment for access to fuel filter. Remove union bolt with gaskets, and disconnect fuel inlet hose from fuel filter.
3. Install fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45012) with fuel inlet hose, gaskets and union bolt on fuel filter. (Scheme 17) Tighten union bolt to 21 ft. lbs. (29 N.m).
4. Reconnect negative battery cable. Install scan tool on data link connector No. 3. see scheme 1-8. Turn ignition on. DO NOT start engine.
5. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 9-16.
6. 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 REMOVE/INSTALL/OVERHAUL 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 scan tool from data link connector No. 3. 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 ).
8. 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 fuel pressure gauge. Using NEW gaskets, reinstall fuel inlet hose on fuel filter. Tighten union bolt to 21 ft. lbs. (29 N.m).
10. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Tacoma, T100 & 4Runner

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-22526-S05268160872001010300000) under FUEL SYSTEM. Disconnect negative battery cable.
2. Note location for fuel pressure gauge installation on fuel rail. (Scheme 21)-22. Fuel pressure gauge is installed at firewall end of fuel rail, between fuel rail and fuel inlet pipe. Remove union bolt with gaskets, and disconnect fuel inlet pipe from fuel rail.
3. Install fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45012) with gaskets, fuel inlet pipe and union bolt on fuel rail. (Scheme 21)-22. Tighten union bolt to 21 ft. lbs. (29 N.m).
4. Reconnect negative battery cable. Install scan tool on data link connector No. 3. see scheme 1-8. Turn ignition on. DO NOT start engine.
5. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ). NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 9-16.
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 REMOVE/INSTALL/OVERHAUL 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 scan tool from data link connector No. 3. Start engine and allow engine to idle. Disconnect and plug vacuum line at fuel pressure regulator. Note fuel pressure. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm 2 ).
8. Reconnect vacuum hose on fuel pressure regulator and note fuel pressure with engine idling. Fuel pressure should be 31-37 psi (2.2-2.6 kg/cm 2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, check for defective vacuum hose 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).
11. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Scheme 21

Scheme 22

Tercel

1. Ensure battery is fully charged. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-22526-S05268160872001010300000) under FUEL SYSTEM. Disconnect negative battery cable.
2. Note location for fuel pressure gauge installation on fuel filter. (Scheme 17) Remove union bolt with gaskets, and disconnect fuel inlet hose from fuel filter.
3. Install fuel pressure gauge from Fuel Pressure Gauge Set (SST 09268-45012) with fuel inlet hose, gaskets and union bolt on fuel filter. (Scheme 17) Tighten union bolt to 21 ft. lbs. (29 N.m).
4. Reconnect negative battery cable. Install scan tool on data link connector No. 3. see scheme 1-8. Turn ignition on. DO NOT start engine.
5. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm 2 ). NOTE: Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. see scheme 9-16.
6. 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 REMOVE/INSTALL/OVERHAUL 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 scan tool from data link connector No. 3. 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 ).
8. 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. Disconnect negative battery cable. Remove fuel pressure gauge. Using NEW gaskets, reinstall fuel inlet hose on fuel filter. Tighten union bolt to 21 ft. lbs. (29 N.m).
10. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

FUEL PUMP CONTROL CIRCUIT

Note. For information on testing relays and fuel system components, see SYSTEM/COMPONENT TESTS article. Circuit opening relay may be identified by appropriate illustration in SYSTEM/COMPONENT TESTS article. For complete wiring circuit of electrical components on a specific model, see appropriate wiring diagram in WIRING DIAGRAMS article.

Circuit Opening Relay (Camry & Corolla)

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

Circuit Opening Relay (Celica)

Circuit opening relay controls the fuel pump circuit. When EFI main relay is energized, EFI main relay provides battery voltage to one side of circuit opening relay. When engine is cranking, circuit opening relay receives a start signal which energizes circuit opening relay. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. When start signal is released from circuit opening relay, the Engine Control Module (ECM) then controls the ground circuit for circuit opening relay at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. See CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (RAV4)

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 to the other side of circuit opening relay. When proper input signals are delivered to the Engine Control Module (ECM), the circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. See CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Tacoma & T100)

Circuit opening relay controls the fuel pump circuit. When EFI main relay is energized, EFI main relay provides battery voltage to one side of circuit opening relay. When engine is cranking, circuit opening relay receives a start signal which energizes circuit opening relay. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. When start signal is released from circuit opening relay, the Engine Control Module (ECM) then controls the ground circuit for circuit opening relay at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. See CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (Tercel & 4Runner)

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

CIRCUIT OPENING RELAY LOCATION

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

EFI Main Relay (Camry)

The EFI fuse supplies constant battery voltage to EFI main relay. EFI main relay is energized when ignition is turned on by voltage supplied through IGN fuse to EFI main relay on vehicles not equipped with engine immobilizer system, or by MREL terminal of Engine Control Module (ECM) on vehicles equipped with engine immobilizer system. See appropriate wiring diagram in WIRING DIAGRAMS article. When EFI main relay is energized, the EFI main relay provides battery voltage to circuit opening relay, data link connector No. 1 and various other electrical components. The EFI main relay also provides battery voltage to +B terminal of ECM. See EFI MAIN RELAY LOCATION table.

EFI Main Relay (Celica)

The EFI fuse supplies constant battery voltage to EFI main relay. When ignition is turned on, voltage is supplied through IGN fuse to EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, data link connector No. 1 and various other electrical components. The EFI main relay also provides battery voltage to +B terminal of Engine Control Module (ECM) when ignition is turned on. See EFI MAIN RELAY LOCATION table.

EFI Main Relay (Corolla)

The EFI fuse supplies constant battery voltage to EFI main relay. EFI fuse may also be referred to as F-HTR fuse. EFI main relay may also be referred to as EFI relay or F-HTR relay. When ignition is turned on, voltage is supplied through IGN fuse to EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, data link connector No. 1 and various other electrical components. The EFI main relay also provides battery voltage to +B terminal of Engine Control Module (ECM) when ignition is turned on. See EFI MAIN RELAY LOCATION table.

EFI Main Relay (RAV4)

The EFI fuse supplies constant battery voltage to EFI main relay. When ignition is turned on, voltage is supplied to EFI main relay from the ignition switch. EFI main relay is then energized and provides battery voltage to circuit opening relay, data link connector No. 1 and various other electrical components. The EFI main relay also provides battery voltage to +B terminal of Engine Control Module (ECM) when ignition is turned on. See EFI MAIN RELAY LOCATION table.

EFI Main Relay (Tacoma, Tercel, T100 & 4Runner)

The EFI fuse supplies constant battery voltage to EFI main relay. When ignition is turned on, voltage is supplied through IGN fuse to EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, data link connector No. 1 and various other electrical components. The EFI main relay also provides battery voltage to +B terminal of Engine Control Module (ECM) when ignition is turned on. See EFI MAIN RELAY LOCATION table.

EFI MAIN RELAY LOCATION

Note. Distributor type ignition system is only used on Celica models. For testing of distributorless ignition system on Camry, Corolla, RAV4, Tacoma, Tercel, T100 and 4Runner, see IGNITION CHECKS (DISTRIBUTORLESS IGNITION SYSTEM).

1. Disconnect spark plug wires. Remove spark plugs. Install spark plug on each spark plug wire. Ground spark plug against cylinder block. CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer 2 seconds when checking for spark.
2. Crank engine and check for spark. If spark does not exist, check electrical connection at ignition coil, ignitor and distributor. Ignitor is located near brake booster and the firewall.
3. If electrical connections are okay, go to next step. If electrical connections are defective, repair as necessary and recheck for spark.
4. Using ohmmeter, check resistance of spark plug and ignition coil high tension wires. Replace high tension wire if resistance exceeds 25,000 per ohms per wire. If resistance is within specification, go to next step.
5. Turn ignition on. Using voltmeter, check for battery voltage at ignitor and ignition coil positive terminal. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch, ignition coil and ignitor.
6. Check ignition coil resistance. See IGNITION COIL RESISTANCE under «IGNITION CHECKS (DISTRIBUTOR TYPE»(ref-22526-S17847246912001010300000) IGNITION SYSTEM). If ignition coil resistance is within specification, go to next step. If ignition coil resistance is not within specification, replace ignition coil. See REMOVE/INSTALL/OVERHAUL article.
7. Check pick-up coil resistance. See PICK-UP COIL RESISTANCE under «IGNITION CHECKS (DISTRIBUTOR TYPE»(ref-22526-S17847246912001010300000) IGNITION SYSTEM). If pick-up coil resistance is within specification, go to next step. If pick-up coil resistance is not within specification, replace distributor assembly. See REMOVE/INSTALL/OVERHAUL article.
8. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR RESISTANCE (DISTRIBUTOR TYPE)»(ref-22526-S42155040352001010300000) under IGNITION CHECKS (DISTRIBUTOR TYPE IGNITION SYSTEM). 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 REMOVE/INSTALL/OVERHAUL article.
9. Check pick-up coil air gap. See «PICK-UP COIL AIR GAP»(ref-22526-S18663613972001010300000) under IGNITION CHECKS (DISTRIBUTOR TYPE IGNITION SYSTEM). If pick-up coil air gap is correct, go to next step. If pick-up coil air gap is incorrect, replace distributor assembly. See REMOVE/INSTALL/OVERHAUL 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 the ECM memory to indicate an ignitor circuit malfunction. See TESTS W/CODES article for retrieving and servicing of any 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, distributor and ignitor. ECM is located below passenger's side of instrument panel, underneath carpet near center console. 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).

1. Crankshaft position sensor is located behind timing belt cover, near crankshaft sprocket. Disconnect crankshaft position sensor electrical connector located near generator. (Scheme 23)
2. Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor electrical connector. Ensure crankshaft position sensor resistance is within specification. See «DISTRIBUTOR TYPE IGNITION SYSTEM CRANKSHAFT POSITION SENSOR RESISTANCE»(ref-22526-S10309307642001010300000) table.
3. Replace crankshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall electrical connector.

DISTRIBUTOR TYPE IGNITION SYSTEM CRANKSHAFT POSITION SENSOR RESISTANCE

Scheme 23

1. Disconnect wiring from ignition coil so ignition coil is isolated from the system. Using an ohmmeter, check ignition coil primary resistance between ignition coil positive (+) and negative (-) terminals. (Scheme 24)
2. Check ignition coil secondary resistance between ignition coil positive (+) terminal and the high tension terminal (coil wire tower). (Scheme 24)
3. Ensure ignition coil resistance is within specification. See «DISTRIBUTOR TYPE IGNITION SYSTEM IGNITION COIL RESISTANCE»(ref-22526-S11060964932001010300000) table. Replace ignition coil if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article.

DISTRIBUTOR TYPE IGNITION SYSTEM IGNITION COIL RESISTANCE - Ohms

Scheme 24

1. Disconnect electrical connector on distributor. Using ohmmeter, measure resistance between terminals on distributor for pick-up coil. (Scheme 25)
2. Ensure pick-up coil resistance is within specification. See «PICK-UP COIL RESISTANCE SPECIFICATIONS»(ref-22526-S31094541362001010300000) table. Replace distributor assembly if pick-up coil resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall electrical connector.

PICK-UP COIL RESISTANCE SPECIFICATIONS

Scheme 25

Remove distributor cap. Using non-magnetic feeler gauge, check pick-up coil air gap between signal rotor and pick-up coil projection. (Scheme 26) Replace distributor assembly if pick-up coil air gap is not.008-.018" (.20-.45 mm). See REMOVE/INSTALL/OVERHAUL article.

Scheme 26

Note. All models except Celica, use a distributorless ignition system. Celica uses a distributor type ignition system. For testing of distributor type ignition system on Celica, see IGNITION CHECKS (DISTRIBUTOR TYPE IGNITION SYSTEM) .

Camry, Corolla, RAV4, Tacoma, T100 & 4Runner

1. Disconnect spark plug wires. Remove spark plugs. Install spark plug on each spark plug wire. Ground spark plug against cylinder block. CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer than 5 seconds when checking for spark.
2. Crank engine and check for spark. If spark does not exist, 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.
3. Using ohmmeter, check resistance of spark plug wire. Replace spark plug wire if resistance exceeds 25,000 ohms per wire. If resistance is within specification, go to next step.
4. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coil.
5. Check ignition coil resistance. See «IGNITION COIL RESISTANCE (DISTRIBUTORLESS TYPE)»(ref-22526-S09285720802001010300000) . If ignition coil resistance is within specification, go to next step. If ignition coil resistance is not within specification, replace ignition coil. See REMOVE/INSTALL/OVERHAUL article.
6. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-22526-S27371735422001010300000) . 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 REMOVE/INSTALL/OVERHAUL article.
7. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR RESISTANCE (DISTRIBUTORLESS TYPE)»(ref-22526-S34878143732001010300000) . 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 REMOVE/INSTALL/OVERHAUL 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 or P1310 will be set in the ECM memory to indicate an ignitor circuit malfunction. See TESTS W/CODES article for retrieving and servicing of any 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 «ECM LOCATION»(ref-22526-S40502147512001010300000) table. 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.
10. On Camry, Corolla and RAV4, install and tighten spark plugs to 13 ft. lbs. (18 N.m). On Tacoma, T100 and 4Runner, install and tighten spark plugs to 15 ft. lbs. (20 N.m).

1. Remove ignition coils. See REMOVE/INSTALL/OVERHAUL article.
2. Reconnect electrical connectors and spark plug wires on ignition coils. Remove spark plugs. Install spark plug on each ignition coil and each spark plug wire. Ground spark plugs against cylinder block. CAUTION: To prevent gasoline from being injected, DO NOT crank engine for longer than 5 seconds when checking for spark.
3. Crank engine and check for spark. 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 electrical connections. If electrical connections are okay, go to step 5). If electrical connections are defective, repair as necessary and recheck for spark.
4. Using ohmmeter, check resistance of spark plug wire. Replace spark plug wire if resistance exceeds 25,000 ohms per wire.
5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coil.
6. Check ignition coil resistance. See «IGNITION COIL RESISTANCE (DISTRIBUTORLESS TYPE)»(ref-22526-S09285720802001010300000) . If ignition coil resistance is within specification, go to next step. If ignition coil resistance is not within specification, replace ignition coil. See REMOVE/INSTALL/OVERHAUL article.
7. Check resistance of camshaft position sensor. See «CAMSHAFT POSITION SENSOR RESISTANCE»(ref-22526-S27371735422001010300000) under IGNITION CHECKS (DISTRIBUTORLESS IGNITION SYSTEM). 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 REMOVE/INSTALL/OVERHAUL article.
8. Check resistance of crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR RESISTANCE (DISTRIBUTORLESS TYPE)»(ref-22526-S34878143732001010300000) . 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 REMOVE/INSTALL/OVERHAUL 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 will be set in the ECM memory to indicate an ignitor circuit malfunction. See TESTS W/CODES article for retrieving and servicing of any 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 «ECM LOCATION»(ref-22526-S40502147512001010300000) table. 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).

ECM LOCATION

1. Ignition coil primary resistance cannot be checked. Only the ignition coil secondary resistance may be checked. Disconnect spark plug wires and electrical connector from ignition coil.
2. Using ohmmeter, check ignition coil secondary resistance between spark plug wire terminals on ignition coil. (Scheme 27) Ensure ignition coil secondary resistance is within specification. See «DISTRIBUTORLESS TYPE IGNITION SYSTEM IGNITION COIL RESISTANCE»(ref-22526-S00868772892001010300000) table. Replace ignition coil if ignition coil secondary resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall spark plug wires and electrical connector.

Scheme 27

1. Disconnect electrical connector and spark plug wire from ignition coil. Disconnect spark plug wire from ignition coil.
2. Using ohmmeter, check ignition coil primary resistance between ignition coil positive (+) and negative (-) terminals. (Scheme 28)
3. Ensure ignition coil primary resistance is within specification. See «DISTRIBUTORLESS TYPE IGNITION SYSTEM IGNITION COIL RESISTANCE»(ref-22526-S00868772892001010300000) table. Replace ignition coil if ignition coil primary resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article.
4. To check ignition coil secondary resistance, remove ignition coil. See REMOVE/INSTALL/OVERHAUL article.
5. Using ohmmeter, check ignition coil secondary resistance. (Scheme 28) Ensure ignition coil secondary resistance is within specification. See «DISTRIBUTORLESS TYPE IGNITION SYSTEM IGNITION COIL RESISTANCE»(ref-22526-S00868772892001010300000) table. Replace ignition coil if ignition coil secondary resistance is not within specification. Reinstall ignition coil, spark plug wire and electrical connector.

Scheme 28

DISTRIBUTORLESS TYPE IGNITION SYSTEM IGNITION COIL RESISTANCE - Ohms

1. Disconnect electrical connector from camshaft position sensor. Camshaft position sensor is located at timing belt end of cylinder head, on the firewall side of the engine. (Scheme 29)-32. 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-22526-S29249724652001010300000) table. Replace camshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall electrical connector on camshaft position sensor.

Corolla

1. Disconnect electrical connector from camshaft position sensor. Camshaft position sensor is located just above the intake manifold on cylinder head, at flywheel end of engine. (Scheme 29)-32. 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-22526-S29249724652001010300000) table. Replace camshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall electrical connector on camshaft position sensor.

1. Disconnect electrical connector from camshaft position sensor. Camshaft position sensor is located at timing belt end of cylinder head, on the firewall side of the engine. (Scheme 29)-32. 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-22526-S29249724652001010300000) table. Replace camshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall electrical connector on camshaft position sensor.

1. Disconnect electrical connector from camshaft position sensor. Camshaft position sensor is located at driver's side front corner of cylinder head, just in front of the intake manifold. (Scheme 29)-32. 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-22526-S29249724652001010300000) table. Replace camshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall electrical connector on camshaft position sensor.

1. Disconnect electrical connector from camshaft position sensor. Camshaft position sensor is located on end of cylinder head, just above the flywheel. (Scheme 29)-32. 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-22526-S29249724652001010300000) table. Replace camshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall electrical connector on camshaft position sensor.

CAMSHAFT POSITION SENSOR RESISTANCE

Scheme 29

Scheme 30

Scheme 31

Scheme 32

1. Disconnect crankshaft position sensor electrical connector located near front of engine, just below the generator. (Scheme 33)-37. Crankshaft position sensor is located at timing belt end of engine, behind timing belt cover, near sprocket on crankshaft.
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 (DISTRIBUTORLESS TYPE)»(ref-22526-S40415338672001010300000) table.
3. Replace crankshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall crankshaft position sensor electrical connector.

1. Crankshaft position sensor is located on front of engine, near crankshaft pulley. (Scheme 33)-37. NOTE: Manufacturer recommends removing crankshaft position sensor before checking the resistance. Manufacturer states intake manifold must be removed for removal of crankshaft position sensor.
2. Remove crankshaft position sensor. See REMOVE/INSTALL/OVERHAUL 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 (DISTRIBUTORLESS TYPE)»(ref-22526-S40415338672001010300000) table. Reinstall crankshaft position sensor.

1. Disconnect crankshaft position sensor electrical connector located near front of engine, just below the generator. (Scheme 33)-37. Crankshaft position sensor is located at timing belt end of engine, behind timing belt cover, near sprocket on crankshaft.
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 (DISTRIBUTORLESS TYPE)»(ref-22526-S40415338672001010300000) table.
3. Replace crankshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL 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 33)-37.
2. Manufacturer recommends removing crankshaft position sensor before checking the resistance. See REMOVE/INSTALL/OVERHAUL article.
3. Using ohmmeter, check resistance between NE- and NE+ terminals on crankshaft position sensor. (Scheme 33)-37. Replace crankshaft position sensor if resistance is not within specification. See «CRANKSHAFT POSITION SENSOR RESISTANCE (DISTRIBUTORLESS TYPE)»(ref-22526-S40415338672001010300000) table. Reinstall the crankshaft position sensor.

1. Disconnect crankshaft position sensor electrical connector located near oil dipstick. (Scheme 33)-37. Crankshaft position sensor is located at timing belt end of engine, behind timing belt cover, near sprocket on crankshaft.
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 (DISTRIBUTORLESS TYPE)»(ref-22526-S40415338672001010300000) table.
3. Replace crankshaft position sensor if resistance is not within specification. See REMOVE/INSTALL/OVERHAUL article. Reinstall crankshaft position sensor electrical connector.

CRANKSHAFT POSITION SENSOR RESISTANCE (DISTRIBUTORLESS TYPE)

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

IDLE SPEED & IGNITION TIMING

Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ADJUSTMENTS article.

SUMMARY

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