Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2011 Suzuki SX4 2WD L4-2.0LFACTORY OEM SERVICE PROCEDURE
Part 2
Inspection of ECM and Its Circuits
Precautions for ECM Circuit Inspection Precautions for ECM Circuit Inspection
NOTE:
- The connectors of the ECM are watertight. If tester probes are directly connected to any of the connectors when checking the ECM and its circuits, the watertight performance of the connector will be affected, possibly resulting in corrosion of connector terminals and damage to electrical circuits.
Always use the special tool when checking the ECM and its circuits. Connect tester probes only to the special tool's connectors.
- If you connect a voltmeter or ohmmeter directly to control module terminals by removing control module connectors, you can damage the control module.
Never connect a voltmeter or an ohmmeter directly to any terminal of control module by disconnecting control module connectors.
Generator Control Signal and Generator Field Coil Monitor Signal
Generator field coil monitor signal (1):
Generator control signal (2):
Measurement condition
- Engine: Idle speed after warm-up
- Lighting switch: OFF
- A/C switch: OFF
- Blower speed selector: OFF
- Rear defogger switch: OFF
Measurement condition
- Engine: Idle speed after warm-up
- Lighting switch: ON
- A/C switch: ON
- Blower speed selector: 4th position
- Rear defogger switch: ON
HO2S Signal and HO2S Heater Signal
HO2S signal (1):
HO2S heater signal (2):
Measurement condition
- Engine: Idle speed after warm-up
Measurement condition
- Engine: Racing after warm-up
Ignition Coil Signal
Measurement condition
- Engine: Idle speed after warm-up
MAF Sensor Signal
Measurement condition
- Engine: Idle speed after warm-up
A/F Sensor Heater Signal
Measurement condition
- Engine: Idle speed after warm-up
OCV Signal
Measurement condition
- OCV: OFF -> ON (using "Active Test of SUZUKI scan tool")
A/F Sensor Signal
Measurement condition
- Engine: Racing after warm-up
IMT Valve Actuator Signal
IMT valve actuator signal (close) (1):
IMT valve actuator signal (open) (2):
Measurement condition
- Ignition switch: ON
Measurement condition
- IMT valve: CLOSE -> OPEN (using "Active Test of SUZUKI scan tool)
- IMT valve: OPEN -> CLOSE (using "Active Test of SUZUKI scan tool)
Throttle Actuator Signal
Measurement condition
- Ignition switch: ON
- Accelerator pedal: Idle position
Measurement condition
- Ignition switch: ON
- Accelerator pedal: Fully depressed position
CKP Sensor Signal and CMP Sensor Signal
CMP sensor signal (1):
CKP sensor signal (2):
Measurement condition
- Engine: Idle speed after warm-up
Knock Sensor Signal
Measurement condition
- Engine: Running at 4,000 rpm after warmed up
EVAP Canister Purge Valve Signal
Measurement condition
- EVAP canister purge valve: 10% open (using "Active Test of SUZUKI scan tool)
Engine speed signal
Measurement condition
- Engine: Idle speed after warm-up
CAN Communication Signal
CAN communication signal (High) (1):
CAN communication signal (Low) (2):
Measurement condition
- Engine: Stop
- Ignition switch: ON
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.