Intake components
Intake components are monitored for continuity and out-of-tolerance values. Rationalization is also checked. The rationalization check is designed to detect a malfunction with a strange signal from the sensor, i.e. the throttle position sensor detects a high throttle position at low engine loads or manifold absolute pressure sensor voltage (IDA).
Intake components may contain these and other sensors:
- vehicle speed sensor (VSS);
- crankshaft position sensor (TFR);
- throttle position sensor (TR);
- coolant temperature sensor (EATING);
- camshaft position sensor (SMR);
- manifold absolute pressure sensor (IDA).
In addition to checking for continuity and rationalization, the ECT sensor is tested to see if it can achieve a constant temperature to ensure a closed fuel control loop.
Release Components
Release components are diagnosed for compliance with feedback on control unit commands. Components that cannot be functionally diagnosed will be diagnosed for continuity and out-of-tolerance data.
The following and other components of the release are subject to diagnostics:
- idle airflow control stepper motor (IAC);
- control unit, EVAP tank evaporative valve:
- air conditioner relay;
- fan relay;
- VSS output;
- fault indicator controller (MIL).
Passive and active diagnostic tests
A passive test is a diagnostic that simply monitors a vehicle's system or component. Conversely, an active test is the taking of certain measures during the diagnosis, often based on the results of a passive test that has not been passed. For example, an active EGR test will cause the EGR valve to open during closed throttle braking and/or cause the EGR valve to close stably. Each of these conditions affects reservoir pressure.
Warm-up cycle
The warm-up cycle means that the engine temperature must reach a minimum of 70°C and rise to a minimum of 22°C after driving. Boundary data is an element of the diagnostic system, where various vehicle data are stored at the time an exhaust system malfunction is stored in the memory and when a command is given to turn on the malfunction indicator. This information will help you find the cause of the problem.
Crash Data
Fault data is an extended feature of boundary data. Fault data stores the same vehicle information as boundary data, but this information is stored for each fault in the on-board memory, while boundary data is only stored for exhaust system faults, and the malfunction indicator is commanded to turn on.