Engine Controls - Adjustments Suzuki Swift II

ENGINE MECHANICAL

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

VALVE CLEARANCE

Note. Swift DOHC uses hydraulic lifters. No adjustments are required.

VALVE CLEARANCE SPECIFICATIONS

SOHC

1. Remove valve cover. Remove right inner fender apron extension to enable timing marks to be seen. Align crankshaft pulley timing mark with TDC mark on timing belt cover. (Scheme 1)
2. Remove distributor cap. Ensure rotor is pointing upward toward distributor hold-down bolt and to No. 1 terminal of distributor cap. If rotor is not as described, rotate engine 360 degrees.
3. Measure valve clearance between adjustment screw and valve stem using shim thickness gauge. Check intake valve clearance of cylinders No. 1 and 2 and exhaust valve clearance of cylinders No. 1and 3. See «VALVE CLEARANCE SPECIFICATIONS»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table. Turn crankshaft one complete revolution (360 degrees). Check intake valve clearance of cylinders No. 3 and 4 and exhaust valve clearance of cylinders No. 2 and 4.
4. Adjust valves by loosening lock nut and turning adjusting screw until clearance is as specified. Hold adjusting screw while tightening lock nut to 11.0-13.5 ft. lbs. (15-18 N.m). Recheck clearance.

IGNITION TIMING

Note. Verify that increasing engine speed advances ignition timing.

IGNITION TIMING (Degrees BTDC @ RPM)

Scheme 1

1. Ensure transmission is in Neutral or Park. Set parking brake. Inspect crankshaft pulley timing mark and timing mark indicator on timing belt cover. (Scheme 1) Clean marks as required. Start engine, and warm it to normal operating temperature. Turn all accessories off. Attach timing light to No. 1 spark plug wire. Ensure idle speed is correct. See «IDLE SPEED SPECIFICATIONS»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table under IDLE SPEED & MIXTURE. CAUTION: Driving with jumper wire installed in monitor coupler will damage catalytic converter.
2. Connect terminals "D" (ground) and "E" (test switch) of monitor coupler. (Scheme 2) Aim timing light at crankshaft pulley and timing cover timing marks. If ignition timing is not within specification, loosen distributor hold-down bolt and rotate distributor to obtain correct ignition timing. See «IGNITION TIMING»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table. Tighten distributor hold-down bolt, and recheck ignition timing.

Scheme 2

PICK-UP COIL AIR GAP

1. Remove distributor cap and rotor. Using non-magnetic shim thickness gauge, measure air gap between reluctor tooth and pick-up coil. See «PICK-UP COIL AIR GAP»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table. If adjustment is required, loosen pick-up coil plate hold-down screws.
2. Using blade screwdriver, move pick-up coil plate to adjust air gap to specification. See «PICK-UP COIL AIR GAP»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) F. Tighten screws, and recheck air gap. Ensure no metal particles are on pick-up coil tooth.

PICK-UP COIL AIR GAP

IDLE SPEED & MIXTURE

Note. Mixture is not adjustable. Mixture is controlled by ECM from various sensor inputs.

COLD (FAST) IDLE

Note. Cold start or fast idle speed is not adjustable. Air valve operation supplies by-pass air for cold starting.

IDLE SPEED

Note. DO NOT adjust idle speed in areas above 8200 ft. elevation.

IDLE SPEED SPECIFICATIONS (1)

ISC DUTY AT SPECIFIED IDLE SPEED (1)

Note. On Swift, specified values used for this inspection and adjustment vary depending on type of ECM. Type of ECM can be identified by last digit of ECM part number. Last digit will be "0" or a number other than "0".

1. Idle speed is controlled by ECM using ISC solenoid valve and requires no adjustments under normal conditions. If conditions require idle speed to be adjusted, start engine and warm it to operating temperature. Turn all accessories off. Ensure all fuel and emission control system wire connectors and hoses are properly connected. Ensure accelerator cable has free-play, air cleaner and ducts are properly installed and air filter element is in good condition.
2. Ensure ignition timing is correct. See «IGNITION TIMING»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table under IGNITION TIMING. Connect terminal "B" (diagnosis switch) to terminal "D" (ground) using a service wire. (Scheme 2) CHECK ENGINE light should indicate Code 12. Attach duty meter to duty output terminal "F" and ground terminal "D". Remove idle speed adjusting screw cap from side of throttle body, just above throttle lever. Turn idle speed adjusting screw to obtain correct idle speed. Refer to the «IDLE SPEED SPECIFICATIONS»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) and «ISC DUTY AT SPECIFIED IDLE SPEED»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) tables. On vehicles without A/C, remove service wire, reinstall protective cap to throttle body and recheck idle speed.
3. On vehicles equipped with A/C, turn A/C switch to ON position and set fan switch to HIGH position. With A/C operating correctly, verify idle speed is 850-950 RPM. If adjustment is required, turn A/C Vacuum Solenoid Valve (VSV) adjusting screw as necessary. (Scheme 3) See «IDLE SPEED SPECIFICATIONS»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table. Remove service wire, reinstall protective cap to throttle body and recheck idle speed.

Scheme 3

DOHC

1. Idle speed is controlled by ISC solenoid valve and should not require adjustment. If idle speed needs to be changed, start engine and warm it to operating temperature. Turn all accessories off. Ensure all fuel and emission control system wire connectors and hoses are properly connected. Ensure accelerator cable has free play. Ensure air cleaner and ducts are properly installed and air filter element is in good condition.
2. Ensure ignition timing is correct. See «IGNITION TIMING»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table under IGNITION TIMING. Connect terminal "B" (diagnosis switch) to terminal "D" (ground) using a service wire. (Scheme 2) CHECK ENGINE should indicate Code 12. Attach duty meter to duty output terminal "F" and ground terminal "D". Remove idle speed adjusting screw protective cap from top of throttle body. (Scheme 3) Turn idle speed adjusting screw to obtain correct idle RPM. See «IDLE SPEED SPECIFICATIONS»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) and «ISC DUTY AT SPECIFIED IDLE SPEED»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) tables.
3. On vehicles equipped with A/C, turn A/C switch to ON position and set fan switch to HIGH position. With A/C operating correctly, verify idle is 850-950 RPM and ISC duty is 30-40 percent. If adjustment is required, turn A/C Vacuum Solenoid Valve (VSV) adjusting screw to obtain correct idle. See «IDLE SPEED SPECIFICATIONS»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table. Remove service wire, reinstall protective cap to throttle body and recheck idle speed.

Scheme 4

Ensure cable has.12-.20" (3.0-5.0 mm) free play. Hold exposed portion of cable at center and move cable up and down to measure free play. Use lock nut and adjusting nut on cable bracket to adjust free play. (Scheme 4)

1. Ensure transmission is in Park or Neutral and parking brake is set. Start engine, and warm it to operating temperature. Turn all accessories off. Ensure idle speed is within specification. See the «IDLE SPEED SPECIFICATIONS»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table.
2. Operate throttle lever to increase and decrease engine RPM while noting RPM at which dashpot rod contacts throttle lever. Adjust dashpot adjusting screw to specified RPM at which dashpot rod should contact throttle lever. (Scheme 4)and (Scheme 6). See «DASHPOT ADJUSTMENT»(/suzuki/swift/ii-1989-1995/remont/adjustments/#engine-controls-adjustments) table.

DASHPOT ADJUSTMENT

THROTTLE POSITION SENSOR (TPS)

THROTTLE POSITION SENSOR (TPS) RESISTANCE (DOHC)

THROTTLE POSITION SENSOR (TPS) RESISTANCE (SOHC) (1)

TPS INSPECTION (DOHC)

Unplug TPS connector. Using ohmmeter, check resistance with selected shim thickness gauges between throttle stop screw and throttle lever. See THROTTLE POSITION SENSOR (TPS) RESISTANCE (DOHC) table. (Scheme 5)and (Scheme 6). If TPS cannot be adjusted to obtain correct values at terminals "C" and "D", replace TPS.

Scheme 5

Scheme 6

TPS ADJUSTMENT (DOHC)

1. Unplug TPS connector, and loosen TPS mounting screws. Place a.025" (.63 mm) shim thickness gauge between throttle lever and throttle stop screw. (Scheme 6)
2. Connect ohmmeter between terminals "C" and "D". (Scheme 5) Turn TPS fully clockwise, and then slowly rotate TPS counterclockwise to locate position at which ohmmeter reading changes from zero to infinity. Holding TPS at that position, tighten mounting screws snug.
3. Ensure continuity does not exist between terminals "C" and "D" when 0.035" (0.90 mm) shim thickness gauge is inserted between throttle lever and throttle stop screw.
4. Ensure continuity exists between terminals "C" and "D" when 0.012" (0.30 mm) shim thickness gauge is inserted between throttle lever and throttle stop screw. Tighten TPS mounting screws to 30 INCH lbs.(3.4 N.m).
5. If continuity is not as specified in steps 3) and 4), TPS zero adjustment is incorrect. Start adjustment sequence again. If results are same after readjusting, replace TPS. After final adjustment is completed, reconnect TPS connector.

Note. Swift SOHC M/T uses throttle switch instead of TPS. See THROTTLE SWITCH (TS) .

TPS INSPECTION (SOHC A/T)

Unplug TPS connector. Using ohmmeter, check resistance between terminals of TPS connector with proper shim thickness gauge inserted between throttle lever and throttle stop screw. Refer to the THROTTLE POSITION SENSOR (TPS) RESISTANCE (SOHC) table. (Scheme 7)and (Scheme 8).

Scheme 7

Scheme 8

TPS ADJUSTMENT (SOHC A/T)

1. Unplug TPS connector, and loosen TPS mounting screws. Insert.024" (.60 mm) shim thickness gauge between throttle lever and throttle stop screw. Connect ohmmeter between TPS terminals "A" and "B". (Scheme 8)
2. Turn TPS fully counterclockwise. Turn TPS clockwise to locate position ohmmeter reading changes from zero to infinity. Holding TPS at that position, tighten TPS mounting screws snug.
3. Ensure continuity does not exist between terminals "A" and "B" when 0.035" (0.90 mm) shim thickness gauge is inserted between throttle lever and throttle stop screw.
4. Ensure continuity exists between terminals "A" and "B" when 0.012" (0.30 mm) shim thickness gauge is inserted between throttle lever and throttle stop screw. Tighten TPS mounting screws to 18 INCH lbs.(2.0 N.m).
5. If continuity is not as specified in steps 3) and 4), TPS zero adjustment is incorrect. Start adjustment sequence again. If results are same after readjusting, replace TPS. After final adjustment is completed, reconnect TPS connector.

THROTTLE SWITCH (TS)

Note. Throttle switch is used only on Swift SOHC M/T. Throttle position sensor is used on Swift SOHC A/T.

THROTTLE SWITCH INSPECTION (SOHC M/T)

Unplug Throttle Switch (TS) connector. Using ohmmeter, check continuity between terminals of TS connector with proper shim thickness gauge inserted between throttle valve lever and stop screw. See THROTTLE SWITCH CONTINUITY table. (Scheme 7)and (Scheme 9).

THROTTLE SWITCH CONTINUITY

Scheme 9

THROTTLE SWITCH ADJUSTMENT (SOHC M/T)

1. Unplug Throttle Switch (TS) connector. Insert.024" (.06 mm) shim thickness gauge between throttle lever and throttle stop screw. Loosen TS mounting screws. (Scheme 7)
2. Connect ohmmeter between terminals "A" and "B". (Scheme 9) Turn TS fully counterclockwise. Turn TS slowly clockwise to locate point at which ohmmeter reading changes from zero to infinity. Hold TS at that position, and snug-tighten mounting screws.
3. Ensure continuity does not exist between terminals "A" and "B" when 0.035" (0.9 mm) shim thickness gauge is inserted between throttle lever and throttle stop screw.
4. Ensure continuity exists between terminals "A" and "B" when 0.012" (0.30 mm) shim thickness gauge is inserted between throttle lever and throttle stop screw. Tighten TPS mounting screws to 18 INCH lbs.(2.0 N.m).
5. If continuity is not as specified in steps 3) and 4), TS zero adjustment is incorrect. Restart adjustment sequence. If results are still incorrect, replace TS. After final adjustment is completed, ensure mounting screws are tightened and reconnect TS connector.

POWER STEERING VSV

Disconnect VSV connector, and check resistance between terminals. If resistance is not 33-39 ohms, replace VSV. If resistance is 33-39 ohms, disconnect vacuum hoses from 3-way joints. Blow into top hose. Air should not come out of other hose. With 12 volts and ground applied to terminals, blow into top hose. Air should pass through hoses. If results are not as described, replace VSV.

See also:
• VALVE CLEARANCE SPECIFICATIONS
• THROTTLE SWITCH (TS)