Toyota Celica 2005 Repair Manual page 216

9. DEFINITION OF TERMS
Term
Monitor description
Related DTCs
Typical enabling condition
Sequence of operation
Required sensor/compo-
nents
Frequency of operation
Duration
Malfunction thresholds
MIL operation
10. TOYOTA/LEXUS PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS name
Toyota HCAC system, Hydro−carbon Adsorptive Catalyst
(HCAC) system, HC adsorptive three−way catalyst
Variable Valve Timing sensor, VVT sensor
Variable valve timing system, VVT system
Camshaft timing oil control valve, Oil control valve, OCV,
VVT, VSV
Variable timing and lift, VVTL
Crankshaft position sensor "A"
Engine speed sensor
THA
Knock control module
Knock sensor
Mass or volume air flow circuit
Vacuum sensor
Internal control module, Control module, Engine control
ECU, PCM
FC idle
Idle air control valve
VSV for CCV, Canister close valve VSV for canister control
VSV for EVAP, Vacuum switching valve assembly No. 1,
EVAP VSV, Purge VSV
VSV for pressure switching valve, Bypass VSV
2005 CELICA (RM1131U)
DIAGNOSTICS
Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic.
Preconditions that allow the ECM to detect malfunctions.
With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
When a sensor is being monitored, the next sensor or component will not be monitored until the sensor monitoring
is finished.
The sensors and components that are used by the ECM to detect malfunctions.
The number of times that the ECM checks for malfunctions per driving cycle.
"Once per driving cycle" means that the ECM detects the malfunction only one time during a single driving cycle.
"Continuous" means that the ECM detects malfunction every time an enabling condition is met.
The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
DTC. This timing begins after the "typical enabling conditions" are met.
Beyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL illumination timing after a defect is detected.
"Immediately" means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
"2 driving cycle" means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
cycle.
− ENGINE (1ZZ−FE)
Definition
HC adsorptive three−way catalytic converter
Camshaft position sensor
Camshaft timing control system
Camshaft timing oil control valve
Camshaft timing and lift control
Crankshaft position sensor
Crankshaft position sensor
Intake air temperature
Engine knock control module
Engine knock sensor
Mass air flow sensor circuit
Manifold air pressure sensor
Power train control module
Deceleration fuel cut
Idle speed control
Evaporative emissions canister vent valve
Evaporative emissions canister purge valve
Evaporative emission pressure switching valve
215
Definition
DI−17