Part 2
Inspection of ECM and Its Circuits
Precautions for Engine
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 an 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.
Fuel injector No.4 signal and ignition coil No.4 signal
Fuel injector No.4 signal (1):
Ignition coil No.4 signal (2):
CMP sensor signal (3):
CKP sensor signal (4):
Measurement condition
- Engine: Idle speed after warm-up
Generator control signal and generator field coil measured signal
Generator field coil measured signal (1):
Generator control signal (2):
Measurement condition
- Engine: Idle speed after warm-up
- Lighting switch: OFF
- A/C switch: OFF
- Blower speed switch: OFF
- Rear defogger switch: OFF
Measurement condition
- Engine: Idle speed after warm-up
- Lighting switch: ON
- A/C switch: ON
- Blower speed switch: 8th 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
- Engine: Idle speed immediately after start-up
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 mode: 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 mode: ON
- Accelerator pedal: Idle position
Measurement condition
- Ignition mode: 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 mode: OFF -> ON -> START
CAN communication signal
CAN communication signal (High) (1):
CAN communication signal (Low) (2):
Measurement condition
- Engine: Stop
- Ignition mode: ON
