Engine Controls - Basic Diagnostic Procedures: Other Suzuki Swift II рестайлинг

Compression

Check engine mechanical condition using a compression gauge, vacuum gauge or an engine analyzer. See engine analyzer manual for specific instructions. Ensure engine is at normal operating temperature. Engine cranking speed must be at least 250 RPM during compression test.

COMPRESSION SPECIFICATIONS

Exhaust System Backpressure

1. Exhaust system backpressure can be checked with a vacuum or pressure gauge. If using a pressure gauge, remove oxygen sensor. Connect a 0-5 psi (0-0.35 kg/cm 2 ) pressure gauge and run engine at 2500 RPM. If exhaust system backpressure is greater than 2 psi (0.14 kg/cm 2 ), exhaust system or catalytic converter is plugged.
2. If using a vacuum gauge, connect vacuum gauge hose to intake manifold vacuum port and start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum gauge reading slowly drops after stabilizing, exhaust system should be checked for a restriction.

FUEL SYSTEM

Note. For diagnosis of a no-start or rough running condition related to a fuel system problem, go to CIRCUIT TESTS .

RELIEVING FUEL PRESSURE

1. Place transmission in Neutral (M/T) or Park (A/T). Set parking brake and block drive wheels. Disconnect fuel pump relay. Fuel pump relay is located in engine compartment relay box.
2. Remove fuel filler cap to release fuel vapor pressure in fuel tank. Reinstall fuel filler cap. Start engine and let run until it stalls. After engine stalls, crank engine 2-3 times for about 3 seconds to dissipate remaining fuel pressure in fuel lines. To restore normal operation, reinstall fuel pump relay.

Scheme 1

1. Release fuel system pressure. See «RELIEVING FUEL PRESSURE»(ref-91181-S27437537842001030500000). Remove fuel inlet hose banjo bolt. Install fuel pressure adapter and gauge in banjo bolt hole. (Scheme 1)
2. Verify battery voltage is 11 volts or greater. Turn ignition on to operate fuel pump for 3 seconds. Turn ignition off. Repeat 3-4 times, and check fuel pressure. See «FUEL PUMP PERFORMANCE»(ref-91181-S28549615972001030500000) table. Start engine and allow it to reach normal operating temperature. Measure fuel pressure at idle. See «REGULATED FUEL PRESSURE»(ref-91181-S21103743732001030500000) table. Turn ignition off.
3. If pressures are not within specification, check for faulty fuel pump, pressure regulator or restriction in fuel system. See «CIRCUIT TEST B-3: FUEL PRESSURE INSPECTION»(ref-91181-S02862548862001030500000) under CIRCUIT TESTS. Repair as necessary. Release fuel pressure and remove fuel pressure gauge. Reinstall fuel inlet hose. Start engine. Ensure no fuel leaks are present.

FUEL PUMP PERFORMANCE

REGULATED FUEL PRESSURE

Fuel System Circuit

Turn ignition on, leaving engine off. Fuel pump should operate for 2 seconds. If fuel pump does not operate, check fuses, fuel pump relay, fuel pump, all electrical connections and PCM. See CIRCUIT TESTS .

IGNITION CHECKS

Note. To diagnose a no-spark condition, perform all procedures listed under IGNITION CHECKS.

All Models

1. Disable fuel injectors by disconnecting injector harness connectors. Remove ignition coils from valve cover(s). Remove spark plugs and inspect for fouling or improper gap. Repair as necessary.
2. Connect spark plugs to ignition coils. Ground spark plugs. Have an assistant depress clutch pedal (M/T). Crank engine. Check for strong Blue spark at spark plug. If spark is not present, check for faulty spark plug. If spark plug is okay, check ignition coil resistance. See «IGNITION COIL RESISTANCE»(ref-91181-S34688071832001030500000) .

SECONDARY WIRE RESISTANCE

Disconnect and remove secondary ignition wires. Using DVOM, measure resistance of each wire. Ensure resistance is 1200-3000 ohms per foot. Replace wire if resistance is not as specified.

IGNITOR (POWER UNIT)

Ignitor is an integral part of ignition coil. See IGNITION COIL RESISTANCE for test procedures.

Scheme 2

1. Remove secondary coil wires. Disconnect harness connector from ignition coil. Using DVOM, measure secondary coil resistance. (Scheme 2) Replace coil if resistance is not as specified. See «IGNITION COIL RESISTANCE»(ref-91181-S11208608432001030500000) table. IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C) Application Secondary Resistance Esteem & Vitara 1.6L 11,100-14,900 Swift 8,500-11,500 Vitara 2.0L & Grand Vitara 2.5L V6 (1) (1) Not available from manufacturer.
2. On Swift, use DVOM to check for continuity in igniter circuit by connecting positive lead to terminal No. 3, and negative lead to terminal No. 1 of ignition coil. (Scheme 2) Continuity should not be present. Using a 1.5-volt battery, connect positive side to terminal No. 2, and negative side to terminal No. 3. DVOM should indicate continuity. Replace coil if continuity is not as specified.

Scheme 3

Scheme 4

1. Disconnect harness connector from ignition coil. Remove ignition coil from valve cover. Using DVOM, measure resistance between terminals of ignition coil (primary resistance). (Scheme 3)
2. Using a 12-volt battery and an ammeter, measure secondary coil current. (Scheme 4) See «IGNITION COIL RESISTANCE»(ref-91181-S11208608432001030500000) table. Ensure current does not flow with polarities reversed. Repeat for remaining ignition coils. Replace ignition coils if resistance or current is not as specified.

Vitara & Grand Vitara

Disconnect harness connector from noise suppressor, taped to main engine wiring harness. (Scheme 5) Using DVOM, ensure continuity is not present between terminals "A" and "B". (Scheme 6) If test result is not within specification, replace noise suppressor.

Scheme 5

Scheme 6

CAMSHAFT POSITION (CMP) SENSOR

Note. Manufacturer does not provide separate circuit testing for CMP sensor. See DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.

CRANKSHAFT POSITION (CKP) SENSOR

Note. Manufacturer does not provide separate circuit testing for CKP sensor. See DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.

IDLE SPEED & IGNITION TIMING

Ensure idle speed and base ignition timing are set to specification. See IDLE SPEED SPECIFICATIONS and IGNITION TIMING tables. If necessary, see ON-VEHICLE ADJUSTMENTS article for adjustment procedures. If scan tool is available, check for correct IAC duty. See IAC DUTY AT SPECIFIED IDLE SPEED table.

IDLE SPEED SPECIFICATIONS (1)

IAC DUTY AT SPECIFIED IDLE SPEED (1)

IGNITION TIMING (Degrees BTDC @ RPM) (1)

Note. Ensure ignition timing advances as engine speed increases.

Scheme 7

Scheme 8

CIRCUIT TESTS

Note. Before proceeding with circuit tests, perform PRELIMINARY DIAGNOSTIC PROCEDURE. See SELF-DIAGNOSTICS - INTRODUCTION article.

CIRCUIT TEST DIRECTORY

Note. See PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article and appropriate wiring diagrams in WIRING DIAGRAMS article for PCM connector and wire terminal identification.

Fuel Injector Circuit

1. Using a mechanic's stethoscope, check each fuel injector for operating "clicking" sound as engine is cranked. If all fuel injectors made operating sound, fuel injector circuit is okay. If no injectors made operating sound, go to next step. If one or more fuel injector(s) do not make operating sound, check for faulty injector wiring harness, faulty injectors or poor connections. If injector wiring harness, injector(s) and connections are okay, replace PCM and retest system.
2. Turn ignition off. Disconnect harness connector from No. 1 fuel injector. Turn ignition on. Using DVOM, measure voltage between ground and Blue/Black wire terminal of harness connector. If DVOM indicates battery voltage, go to next step. If DVOM does not indicate battery voltage, repair power circuit for an open or short and retest system. See appropriate wiring diagram in WIRING DIAGRAMS article.
3. Turn ignition off. Disconnect PCM harness connectors. Using DVOM, check for continuity in all injector circuits at appropriate PCM harness connector terminals. See appropriate wiring diagram in WIRING DIAGRAMS article. If continuity is not present in all injector circuits, go to next step. If continuity is present in all injector circuits, replace PCM and retest system.
4. Using DVOM, measure resistance of each injector where circuit did not indicate continuity. See SERVICE & ADJUSTMENT SPECIFICATIONS article for resistance specifications. Repair as necessary. If injectors are okay, replace PCM and retest system.

Scheme 9

Scheme 10

Scheme 11

1. Turn ignition on. If fuel pump is heard for 2 seconds, circuit is in good condition. If fuel pump is not heard, go to next step. CAUTION: Ensure jumper connections are made correctly. Improper connections may result in damage to PCM and wire harness.
2. Turn ignition off. Remove fuel pump relay from engine compartment relay box. Using a fused jumper wire, connect terminal cavities No. 1 and 2 at relay box together. (Scheme 9)or (Scheme 10). Turn ignition on. If fuel pump is heard, go to next step. If fuel pump is not heard, check for open in Pink wire, Black wire or Red/Black wire (White/Black wire on Swift) to fuel pump relay connector. Repair as necessary. If wires are okay, replace fuel pump and retest system.
3. Turn ignition off. Using DVOM, measure resistance between fuel pump relay terminals. (Scheme 11) Continuity should not be present between relay terminals No. 1 and 2. Resistance between relay terminals No. 3 and 4 should be 70-110 ohms on Esteem, or 79-95 ohms on Swift. Continuity should be present between relay terminals No. 1 and 2 as battery voltage and ground are applied to relay terminals No. 3 and 4. If resistance is as specified, go to next step. If resistance is not as specified, replace fuel pump relay and retest system.
4. Check Yellow/Blue wire (Pink/White wire on Swift) between PCM and fuel pump relay for an open or poor connection. Repair as necessary. If wire is okay, replace PCM and retest system.

Scheme 12

1. Turn ignition on. If fuel pump is heard for 3 seconds, circuit is in good condition. If fuel pump is not heard, go to next step. CAUTION: Ensure jumper connections are made correctly. Improper connections may result in damage to PCM and wire harness.
2. Turn ignition off. Using a fused jumper wire, connect Pink/Black wire and Black/White wire terminals at fuel pump relay connector located on right side of engine compartment. Turn ignition on. If fuel pump is heard, go to next step. If fuel pump is not heard, check Pink/Black wire or Black/White wire for an open or poor connection. Repair as necessary. If wire and connections are okay, replace fuel pump and retest system.
3. Turn ignition off. Remove fuel pump relay. Using DVOM, measure resistance between fuel pump relay terminals. (Scheme 12) Continuity should not be present between relay terminals "A" and "B". On Vitara 4-cylinder, resistance between relay terminals "C" and "D" should be 79-95 ohms at 68°F (20°C). On Grand Vitara V6, resistance between relay terminals "C" and "D" should be 70-110 ohms at 68°F (20°C). Continuity should be present between relay terminals "A" and "B" as battery voltage and ground are applied to relay terminals "C" and "D". If resistance is as specified, go to next step. If resistance is not as specified, replace fuel pump relay and retest system.
4. Check for poor connection or open in Black/White wire or White/Green wire to fuel pump relay. Repair as necessary. If wire and connections are okay, replace PCM and retest system.

Esteem, & Swift

1. Check fuel pressure as ignition switch is cycled on and off. See appropriate fuel pressure test under «FUEL PRESSURE»(ref-91181-S00144738732001030500000) . If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm 2 ), go to next step. If fuel pressure is not as specified, go to step 5 .
2. If fuel pressure maintains 28.4 psi (2.0 kg/cm 2 ) or greater for one minute after fuel pump stops, go to next step. If fuel pressure is not as specified, go to step 4 .
3. Start engine and allow it to reach normal operating temperature. If fuel pressure is 28.4-34.1 psi (2.0-2.4 kg/cm 2 ) with engine at idle, fuel pressure is okay. If fuel pressure is not as specified, check for clogged vacuum passage for fuel pressure regulator or faulty fuel pressure regulator. Repair as necessary.
4. Check for fuel leaks from fuel feed hose, pipe or connections. Repair as necessary. If no leaks are present, go to step 10 .
5. If fuel pressure is greater than 38.4-44.0 psi (2.7-3.1 kg/cm 2 ), go to next step. If fuel pressure is not as specified, go to step 7 .
6. Disconnect fuel return hose from fuel pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Turn ignition on. If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm 2 ), repair restriction in fuel return hose. If fuel pressure is not as specified, replace fuel pressure regulator and retest system.
7. If no fuel pressure is present, go to next step. If fuel pressure is present and is less than 38.4-44.0 psi (2.7-3.1 kg/cm 2 ), go to step 9 .
8. Pinch fuel return hose. Turn ignition on. If fuel pressure increases, replace fuel pressure regulator. If fuel pressure is not as specified, go to «CIRCUIT TEST B-2: FUEL PUMP CIRCUIT INSPECTION»(ref-91181-S17660618452001030500000) . Repair as necessary and retest system.
9. Pinch fuel return hose. Turn ignition on. If fuel pressure is 63.9 psi (4.5 kg/cm 2 ) or greater, replace fuel pressure regulator. If fuel pressure is not as specified, check for clogged fuel filter, restricted fuel feed hose, faulty fuel pump or fuel leakage at hose connection in fuel tank. Repair as necessary and retest system.
10. Disconnect fuel return hose from pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Recheck fuel pressure. If fuel is discharged into container, replace fuel pressure regulator. If fuel does not discharge into container, check for leaking injector or fuel rail, faulty fuel pump check valve or leaking fuel pressure regulator diaphragm. Repair as necessary and retest system.

Vitara 4-Cylinder

1. Check fuel pressure as ignition switch is cycled on and off. See appropriate fuel pressure test under «FUEL PRESSURE»(ref-91181-S00144738732001030500000) . If fuel pressure is 35.6-42.7 psi (2.5-3.0 kg/cm 2 ) and holds at 25.6 psi (1.8 kg/cm 2 ) or greater for one minute after fuel pump stops, go to next step. If fuel pressure is not present, go to step 3 . If fuel pressure is as specified, but does not hold, go to step 4 . If fuel pressure is low, go to step 5 . If fuel pressure is high, go to step 6 .
2. Start engine and allow it to reach normal operating temperature. If fuel pressure is 29.8-37.0 psi (2.1-2.6 kg/cm 2 ) with engine at idle, fuel pressure is okay. If fuel pressure is not as specified, check for clogged vacuum passage for fuel pressure regulator or faulty fuel pressure regulator. Repair as necessary and retest system.
3. Pinch fuel return hose. Turn ignition on. If fuel pressure increases, replace fuel pressure regulator. If fuel pressure is not as specified, go to «CIRCUIT TEST B-2: FUEL PUMP CIRCUIT INSPECTION»(ref-91181-S17660618452001030500000) . Repair as necessary and retest system.
4. Disconnect fuel return hose from pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Recheck fuel pressure. If fuel is discharged into container, replace fuel pressure regulator. If fuel does not discharge into container, check for leaking injector or fuel rail, faulty fuel pump check valve or leaking fuel pressure regulator diaphragm. Repair as necessary and retest system.
5. Pinch fuel return hose. Turn ignition on. If fuel pressure is 64.0 psi (4.5 kg/cm 2 ) or greater, replace fuel pressure regulator. If fuel pressure is not as specified, check for clogged fuel filter, restricted fuel feed hose, faulty fuel pump or fuel leakage at hose connection in fuel tank. Repair as necessary and retest system.
6. Disconnect fuel return hose from fuel pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Turn ignition on. If fuel pressure is 35.6-42.7 psi (2.5-3.0 kg/cm 2 ), repair restriction in fuel return hose. If fuel pressure is not as specified, replace fuel pressure regulator and retest system.

Grand Vitara V6

1. Check fuel pressure as ignition switch is cycled on and off. See appropriate fuel pressure test under «FUEL PRESSURE»(ref-91181-S00144738732001030500000) . If fuel pressure is 38.4-44.1 psi (2.7-3.1 kg/cm 2 ) and holds at 28.4 psi (2.0 kg/cm 2 ) or greater for one minute after fuel pump stops, go to next step. If fuel pressure is not present, go to step 3 . If fuel pressure is as specified, but does not hold, go to step 4 . If fuel pressure is low, go to step 5 . If fuel pressure is high, go to step 6 .
2. Start engine and allow it to reach normal operating temperature. If fuel pressure is 29.9-37.0 psi (2.1-2.6 kg/cm 2 ) with engine at idle, fuel pressure is okay. If fuel pressure is not as specified, check for clogged vacuum passage for fuel pressure regulator or faulty fuel pressure regulator. Repair as necessary and retest system.
3. Pinch fuel return hose. Turn ignition on. If fuel pressure increases, replace fuel pressure regulator. If fuel pressure is not as specified, go to «CIRCUIT TEST B-2: FUEL PUMP CIRCUIT INSPECTION»(ref-91181-S17660618452001030500000) . Repair as necessary and retest system.
4. Disconnect fuel return hose from pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Recheck fuel pressure. If fuel is discharged into container, replace fuel pressure regulator. If fuel does not discharge into container, check for leaking injector or fuel rail, faulty fuel pump check valve or leaking fuel pressure regulator diaphragm. Repair as necessary and retest system.
5. Pinch fuel return hose. Turn ignition on. If fuel pressure is 38.4 psi (2.7 kg/cm 2 ) or greater, replace fuel pressure regulator. If fuel pressure is not as specified, check for clogged fuel filter, restricted fuel feed hose, faulty fuel pump or fuel leakage at hose connection in fuel tank. Repair as necessary and retest system.
6. Disconnect fuel return hose from fuel pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Turn ignition on. If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm 2 ), repair restriction in fuel return hose. If fuel pressure is not as specified, replace fuel pressure regulator and retest system.

SUMMARY

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to SELF-DIAGNOSTICS - INTRODUCTION article. If no hard 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.