Part 1
Inspection of ECM and Its CircuitsCAUTION: ECM and its circuits can be checked by measuring voltage and pulse signal with special tool connected. It is strictly prohibited to connect voltmeter or ohmmeter to ECM with ECM connectors disconnected from it.
Reference waveform
NOTE:
- Waveform analysis is as follows.
- Waveform might change for measurement condition and vehicle spec.
Throttle actuator control signal
Measurement condition
- Ignition switch: ON
- Accelerator pedal: Released position - Fully depressed position
Released position
Fully depressed position
HO2S heater control signal
Measurement condition
- Engine: Idle speed after warming up
HO2S-1 signal and HO2S-2 signal
Measurement condition
- Engine: Idle speed after warming up
- Engine: Racing after warming up
Idle speed after warming up
Racing after warming up
OCV control signal
Measurement condition
- Engine: Idle speed after warming up
- Engine: Racing after warming up
Idle speed after warming up
Racing after warming up
Ignition coil control signal
Measurement condition
- Engine: Idle speed after warming up
Ignition coil No.1 / 3 / 5 control signal and CKP sensor signal
Measurement condition
- Engine: Idle speed after warming up
Ignition coil No.2 / 4 / 6 control signal and CKP sensor signal
Measurement condition
- Engine: Idle speed after warming up
CMP sensor signal
Measurement condition
- Engine: Idle speed after warming up
CMP sensor (intake side) signal and CMP sensor (exhaust side) signal
Measurement condition
- Engine: Idle speed after warming up
CKP sensor signal
Measurement condition
- Engine: Idle speed after warming up
Fuel injector control signal
Measurement condition
- Engine: Idle speed after warming up
Fuel injector No.1 / 3 / 5 control signal and CKP sensor signal
Measurement condition
- Engine: Idle speed after warming up
Fuel injector No.2 / 4 / 6 control signal and CKP sensor signal
Measurement condition
- Engine: Idle speed after warming up
