Engine Controls - Adjustments - 4-cyl Toyota Camry V30

ENGINE MECHANICAL

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.

4-CYLINDER

Note. Adjust valve clearance with engine cold.

Scheme 1

1. On Previa models, remove screws and right front seat scuff plate. Remove bolt and disconnect right seat belt from floor panel.
2. Remove retaining bolts and right front seat. Remove retaining bolts and right front seat leg. Remove retaining bolts, jack holder and right engine service hole cover.
3. Install bolt in end of accessory drive shaft, near cooling fan and tighten nut. (Scheme 1) Bolt is used to rotate the engine. NOTE: If valve cover uses grommets below retaining nuts or bolts, keep grommets in order so they are installed in original location during reassembly.
4. On all models, remove valve cover(s). Rotate crankshaft so timing mark on crankshaft pulley aligns with "0" mark on front cover and cylinder No. 1 (front cylinder) is at TDC on compression stroke.
5. Ensure valves on cylinder No. 1 are closed. With cylinder No. 1 at TDC, check clearance on specified valves. See «VALVE ADJUSTMENT SEQUENCE (CAMRY, CELICA, COROLLA, MR2, PASEO &»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) PREVIA) table. (Scheme 2)
6. Using feeler gauge, measure and record clearance between valve lifter and camshaft. Ensure clearance is within specification. See «VALVE CLEARANCE SPECIFICATIONS (4-CYLINDER)»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table.
7. To check remaining valves, rotate crankshaft 360 degrees (one full revolution) until cylinder No. 4 is at TDC of compression stroke. Measure valve clearance on specified valves. Refer to the «VALVE ADJUSTMENT SEQUENCE (CAMRY, CELICA, COROLLA, MR2, PASEO &»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) PREVIA) table.
8. If valves require adjustment, rotate crankshaft so camshaft lobe on valve to be adjusted is facing upward, away from valve lifter. Rotate valve lifter so notch on valve lifter is toward spark plug.
9. Press valve lifter downward using Valve Clearance Adjuster (SST 09248-55020) and SST (A). (Scheme 3) Install SST (B) between camshaft and valve lifter. Remove SST (A).
10. Using small screwdriver and magnet, remove adjusting shim. Measure thickness of adjusting shim removed. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used. Determine correct thickness of adjusting shim to be used by subtracting appropriate valve clearance specification (See «VALVE CLEARANCE SPECIFICATION»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) Table) from measured valve clearance. Add this number to thickness of old shim. Select a new shim with a thickness as close as possible to the calculated value. See appropriate «SHIM THICKNESS»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl).
11. Install adjusting shim and recheck valve clearance. Install valve cover and gasket. On Previa models, remove bolt from accessory drive shaft. On all models, to install remaining components, reverse removal procedure.

Scheme 2

Scheme 3

VALVE ADJUSTMENT SEQUENCE (CAMRY, CELICA, COROLLA, MR2, PASEO & PREVIA)

VALVE CLEARANCE SPECIFICATIONS (4-CYLINDER)

SHIM THICKNESS (CELICA 2.0L TURBO, CAMRY & CELICA 2.2L)

SHIM THICKNESS (PASEO 1.5L, CELICA & COROLLA 1.6L & MR2 2.2L NON-TURBO)

SHIM THICKNESS (MR2 2.0L TURBO)

SHIM THICKNESS (PREVIA 2.4L)

Pickup & 4Runner

1. Check and adjust valve clearance with engine at normal operating temperature. Remove valve cover.
2. Rotate crankshaft pulley and align groove on crankshaft pulley with "0" mark on front cover so set cylinderNo. 1 (front cylinder) is at TDC on compression stroke.
3. Ensure rocker arms on cylinder No. 1 are loose, and rocker arms on cylinder No. 4 are tight. If rocker arms are not as described, rotate crankshaft 360 degrees and realign timing marks.
4. Using feeler gauge, check intake valve clearance between rocker arm and valve stem on cylinders No. 1 and 2, and exhaust valve clearance on cylinders No. 1 and 3. (Scheme 4) Clearance should be within specification. See «VALVE CLEARANCE SPECIFICATIONS (4-CYLINDER)»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table.
5. Adjust valve clearance if necessary by loosening adjusting screw lock nut and rotating adjusting screw. Tighten lock nut and recheck valve clearance.
6. Rotate crankshaft 360 degrees and realign timing marks. Check intake valve clearance on cylinders No. 3 and 4, and exhaust valve clearance on cylinders No. 2 and 4. Adjust clearance if necessary. Install valve cover and gasket.

Scheme 4

Tercel

1. Check and adjust valve clearance with engine at normal operating temperature. Remove valve cover. Rotate crankshaft pulley and align pulley groove with "0" mark on timing belt cover so cylinder No. 1 is at TDC on compression stroke.
2. Ensure rocker arms on cylinder No. 1 are loose, and rocker arms on cylinder No. 4 are tight. If rocker arms are not as described, rotate crankshaft 360 degrees and realign timing marks.
3. To check valve clearance, measure clearance between camshaft lobe and rocker arm on the proper intake and exhaust valves using the proper thickness feeler gauge. (Scheme 5) Refer to the «VALVE CLEARANCE SPECIFICATIONS (4-CYLINDER)»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table.
4. Adjust valve clearance if necessary by loosening adjusting screw lock nut and rotating adjusting screw. Tighten lock nut and recheck valve clearance.
5. Rotate crankshaft 360 degrees and realign timing marks. This will place cylinder No. 1 at TDC on exhaust stroke. Check clearance on remaining valves. (Scheme 5) Adjust valve clearance if necessary. Install valve cover.

Scheme 5

IGNITION TIMING

1. Warm engine to normal operating temperature. Shut engine off. Connect timing light. Connect tachometer to proper terminals of engine check connector. (Scheme 6)-14.
2. Install jumper wire between proper terminals of engine check connector. (Scheme 15)-22. Start engine and ensure idle speed is within specification. Ensure base timing is within specification with engine at specified RPM. See «4-CYLINDER IGNITION TIMING (DEGREES BTDC @ RPM)»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table. NOTE: Timing marks are on front cover.
3. Adjust timing by rotating the distributor.
4. Remove jumper wire from engine check connector and ensure advance timing is within specification. See «4-CYLINDER IGNITION TIMING (DEGREES BTDC @ RPM)»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table. Tighten distributor hold-down bolt or cam position sensor bolt.

4-CYLINDER IGNITION TIMING (DEGREES BTDC @ RPM) (1)

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

IDLE SPEED & MIXTURE

Note. Mixture adjustment is not possible on any model.

4-CYLINDER IDLE SPEED

Note. Adjust idle speed with air cleaner installed, all air intake system hoses and vacuum lines connected, electronic fuel injection system wiring connectors tight, transmission/transaxle in Neutral, all accessories and cooling fan off (if equipped) and engine at normal operating temperature.

Camry & Previa

1. Install tachometer on proper terminals of engine check connector. (Scheme 6)-14. Start engine and check if idle speed is within specification. See «4-CYLINDER IDLE SPEED SPECIFICATIONS»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table.
2. If idle speed is not within specification, check Idle Speed Control (ISC) valve, wiring and ECU. See IDLE CONTROL SYSTEM in I - SYS/COMP TESTS article in this section. Remove tachometer.

Celica 1.6L (4A-FE), Corolla & Paseo

1. Install tachometer on proper terminals of engine check connector. (Scheme 6)-14. Start engine and operate at 2500 RPM for approximately 2 minutes. Allow engine to idle.
2. Install jumper wire between proper terminals of engine check connector. (Scheme 15)-22. Ensure idle speed is within specification. See «4-CYLINDER IDLE SPEED SPECIFICATIONS»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table.
3. If idle speed requires adjustment, remove rubber boot (if equipped) from throttle body. (Scheme 23) Adjust idle speed adjusting screw to obtain correct idle speed. Install rubber boot. Remove jumper wire and tachometer.

Scheme 23

Celica 2.0L Turbo, Celica 2.2L (5S-FE) & MR2 2.0L Turbo

1. Install tachometer on proper terminals of engine check connector. (Scheme 6)-14. Start engine and operate at 2500 RPM for approximately 90 seconds.
2. Allow engine to idle and note if idle speed is within specification. See «4-CYLINDER IDLE SPEED SPECIFICATIONS»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table. If idle speed is not within specification, check Idle Speed Control (ISC) valve, wiring and ECU. See IDLE CONTROL SYSTEM in I - SYS/COMP TESTS article in this section. Remove tachometer.

MR2 2.2L

1. Install tachometer on proper terminals of engine check connector. (Scheme 6)-14. Install jumper wire between proper terminals of engine check connector. (Scheme 15)-22. Start engine and operate at 1000-1300 RPM for approximately 5 seconds. Allow engine to idle.
2. Ensure idle speed is within specification. See «4-CYLINDER IDLE SPEED SPECIFICATIONS»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table. If idle speed requires adjustment, remove rubber boot (if equipped) from throttle body. (Scheme 23) Adjust idle speed adjusting screw to obtain correct idle speed.
3. Remove jumper wire from engine check connector. Recheck engine idle speed. Engine idle speed should now be 700 RPM on A/T models or 750 RPM on M/T models.
4. If idle speed is not within specification after removing jumper wire, data must be restored for the idle speed control system. To restore the data, test drive vehicle at speeds greater than 10 MPH and perform several stops.
5. Data can also be restored by shutting engine off and then restarting, allowing to idle for 30 seconds and then shutting engine off. Recheck idle speed. Remove jumper wire and tachometer.

1. Install tachometer on proper terminals of engine check connector (Pickup) or ignition coil (4Runner). (Scheme 6)-14. Start engine and operate at 2500 RPM for approximately 2 minutes.
2. Allow engine to idle and ensure idle speed is within specification. See «4-CYLINDER IDLE SPEED SPECIFICATIONS»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table. If idle speed requires adjustment, remove rubber boot (if equipped) from throttle body. (Scheme 23)
3. Adjust idle speed adjusting screw to obtain correct idle speed. Install rubber boot. Remove tachometer.

1. Install tachometer on proper terminals of engine check connector. (Scheme 6)-14. Disconnect electrical connector from idle-up Vacuum Switching Valve (VSV). (Scheme 24)
2. Start engine and operate at 2500 RPM for approximately 2 minutes. Allow engine to idle and ensure idle speed is within specification. See «4-CYLINDER IDLE SPEED SPECIFICATIONS»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table.
3. If idle speed requires adjustment, remove rubber boot (if equipped) from throttle body. (Scheme 23) Adjust idle speed adjusting screw to obtain correct idle speed. Install rubber boot. Remove tachometer.

Scheme 24

4-CYLINDER IDLE SPEED SPECIFICATIONS (1)

THROTTLE POSITION SENSOR ADJUSTMENT

1. Disconnect electrical connector from Throttle Position Sensor (TPS). Loosen mounting screws. Connect ohmmeter between terminals IDL and E1 (MR2 2.2L with M/T) or E2 (all others). (Scheme 25)-29.
2. Apply vacuum to throttle opener (if equipped). (Scheme 25)-29. To set initial clearance, insert proper thickness feeler gauge between throttle stop screw and throttle lever. See «4-CYLINDER THROTTLE POSITION SENSOR ADJUSTMENT»(/toyota/camry/v30-1990-1994/remont/adjustments/#engine-controls-adjustments-4-cyl) table.
3. With ohmmeter showing no continuity, rotate TPS clockwise until continuity exists. Tighten mounting screws. Using specified feeler gauge, recheck adjusted clearance. Disconnect ohmmeter and install electrical connector on TPS.

4-CYLINDER THROTTLE POSITION SENSOR ADJUSTMENT

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

DASHPOT & THROTTLE VALVE OPENER CONTROL SYSTEM

For testing and adjustment procedures, see THROTTLE CONTROLS in I - SYS/COMP TESTS article in this section.

See also:
• VALVE ADJUSTMENT SEQUENCE (CAMRY, CELICA, COROLLA, MR2, PASEO &