Engine Electrical Devices: Other Suzuki SX4 I

Throttle Valve Visual Check

1. Remove air cleaner outlet hose.
2. Check that there isn't any foreign matter caught between throttle valve and throttle body housing. If there is, take it out after removing throttle body referring to «ELECTRIC THROTTLE BODY ASSEMBLY REMOVAL AND INSTALLATION»(ref-268922-S25471826832007102700000) and clean inside of throttle body thoroughly.

Scheme 29

Scheme 30

1. Remove air cleaner outlet hose.
2. Turn OFF ignition switch.
3. Move throttle valve with finger to its full open position and check that it moves smoothly.
4. Move throttle valve with finger to its completely closed position and check that it moves smoothly.
5. Take off finger from throttle valve (1) which is at full open position and check that it moves smoothly by its return spring and open spring force back to default position (position where throttle valve is open by 7° (2) from completely closed position).
6. Take off finger from throttle valve (1) which is at completely closed position and check that it moves smoothly by its return spring and open spring force back to default position. If check result is not satisfactory, replace electric throttle body assembly.

Scheme 31

1. Remove air cleaner outlet hose.
2. Turn ON ignition switch.
3. Depress accelerator pedal gradually and check that throttle valve moves smoothly until it opens fully.
4. Release accelerator pedal depressed in Step 3 ) and check that throttle valve (1) moves back to default position (position where throttle valve is open by 7° (2) from its completely closed position). If check result is satisfactory, electric throttle body system is in good condition. If check result is not satisfactory, proceed to next step.
5. Perform " «ACCELERATOR PEDAL POSITION (APP) SENSOR ASSEMBLY ON-VEHICLE INSPECTION»(ref-268895-S02251944072007102700000) ", " «THROTTLE ACTUATOR (MOTOR) CHECK»(ref-268895-S04741664672007102700000) " and " «THROTTLE POSITION SENSOR PERFORMANCE CHECK»(ref-268895-S35723622112007102700000) ". If check results are not satisfactory, replace electric throttle body assembly. If check results are satisfactory, wire circuit and/or ECM are faulty.

Scheme 32

1. Turn OFF ignition switch.
2. Disconnect connector from electric throttle body assembly.
3. Measure resistance between "M1" terminal (1) and "M2" terminal (2) of electric throttle body assembly. If measured resistance is out of specified value, replace electric throttle body assembly. Throttle actuator (motor) resistance 0.3 - 100 ohms at 20 °C, 68 °F

Scheme 33

Scheme 34

1. Remove air cleaner outlet hose.
2. Turn OFF ignition switch.
3. Disconnect connector from electric throttle body assembly.
4. Check TP sensor (main and sub) output voltage as the following steps. For TP sensor (main), arrange 3 new 1.5 V batteries (1) in series (check that total voltage is 4.5 - 5.0 V) and connect its positive terminal to "Vin" terminal (2) and negative terminal to "Ground" terminal (3) of sensor. Then using voltmeter, connect positive terminal to "Vout 1" terminal (4) of sensor and negative terminal to battery. For TP sensor (sub), arrange 3 new 1.5 V batteries (1) in series (check that total voltage is 4.5 - 5.0 V) and connect its positive terminal to "Vin" terminal (2) and negative terminal to "Ground" terminal (3) of sensor. Then using voltmeter, connect positive terminal to "Vout 2" terminal (4) of sensor and negative terminal to battery. Measure output voltage variation while throttle valve is opened and closed as the following specification. If sensor voltage is out of specified value and linear variation as the following graph, replace electric throttle body assembly.

TP sensor output voltage

TP sensor (main) [A]: 0.45 - 4.88 V, varying according to throttle valve opening by finger (Voltage should vary by 0.04 V for each 1° valve opening)

TP sensor (sub) [B]: 1.33 - 5.007 V, varying according to throttle valve opening by finger (Voltage should vary by about 0.032 V for each 1° valve opening)

Scheme 35

Performance Check

1. Remove metal particles on end face of CMP sensor, if any.
2. Arrange 12 V battery (1) and connect its positive terminal to "Vin" terminal (2) and negative terminal to "Ground" terminal (3) of sensor. Then using ohmmeter, measure resistance between "Vout" terminal (4) of sensor and negative terminal of battery by passing magnetic substance (iron) (5) while keeping approximately 1 mm (0.03 in.) gap with respect to end face of CMP sensor. If resistance does not vary as specified below, replace CMP sensor.

CMP sensor resistance

Resistance varies from less than 220 ohms (ON) to infinity (OFF) or from infinity (OFF) to less than 220 ohms (ON)

Scheme 36

Waveform Check

Using oscilloscope, check that CKP sensor signal is outputted properly referring to "Reference waveform No.19" and "Reference waveform No.20" of INSPECTION OF ECM AND ITS CIRCUITS .

If sensor signal is outputted properly, CKP sensor is in good condition.

Scheme 37

1. Check that O-ring is free from damage.
2. Check that end face of sensor and signal plate tooth are free from any metal particles and damage.

Resistance Check

Measure resistance between "1" and "2" terminals of CKP sensor.

CKP sensor resistance

480 - 660 ohms at 20 °C, 68 °F

If measured resistance is out of specified value, replace CKP sensor.

Scheme 38