Part 2

Inspection of ECM and Its Circuits

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 or higher
- 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

- Engine: Idle speed immediately after start-up






A/F Sensor Signal





Measurement condition

- Engine: Racing after warm-up











IMT Vacuum Solenoid Valve Signal





Measurement condition

- Engine: Racing after warm-up











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






Fuel Pump Relay Signal





Measurement condition

- Ignition switch: OFF -> ON -> START











IMRC Valve Motor Signal





Measurement condition

- Engine: When engine is cool and running at idle speed





Measurement condition

- Engine: Idle speed after warm-up






CAN Communication Signal

CAN communication signal (High) (1):





CAN communication signal (2):





Measurement condition

- Engine: Stop
- Ignition switch: ON






EVAP Leak Detection Pump Signal





Measurement condition

- Ignition switch: ON





Measurement condition

- EVAP canister air (vent) valve: Operated (using active test of SUZUKI scan tool)