Toyota Tundra. Manual — part 1124

DEFINITION OF TERMS

DEFINITION OF TERMS



After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of
memory and settings. As a result, after turning the ignition
switch OFF, wait 90 seconds or more before disconnecting the
cable from the negative (-) battery terminal.

Fig. 1: Disconnecting Battery Cable

Terms

Definition

Monitor Description

Description of what ECM monitors and how it detects malfunctions (monitoring
purpose and details).

Related DTCs

Group of diagnostic trouble codes that are output by ECM based on same
malfunction detection logic.

Typical Enabling
Condition

Preconditions that allow ECM to detect malfunctions. With all preconditions
satisfied, ECM sets DTC when monitored value(s) exceeds malfunction
threshold(s).

Sequence of Operation

Order of monitor priority, applied if multiple sensors and components involved
in single malfunction detection process.
Each sensor and component monitored in turn, when previous detection
operation completed.

Required
Sensor/Components

Sensors and components used by ECM to detect each malfunction.

Frequency of Operation

Number of times ECM checks for each malfunction during each driving cycle.
"Once per driving cycle" means ECM only performs checks for that malfunction
once during single driving cycle.
"Continuous" means ECM performs checks for that malfunction whenever
enabling conditions met.

Duration

Minimum time for which ECM must detect continuous deviation in monitored
value(s) in order to set DTC. Timing begins when Typical Enabling Conditions

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

PARTS LOCATION

Fig. 2: Identifying Engine Control System Components (1 Of 5)

met.

Malfunction Thresholds Value beyond which ECM determines malfunctions exist and sets DTCs.

MIL Operation

Timing of MIL illumination after malfunction detected.
"Immediate" means ECM illuminates MIL as soon as malfunction detected.
"2 driving cycle" means ECM illuminates MIL if same malfunction detected
second time during next sequential driving cycle.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 3: Identifying Engine Control System Components (2 Of 5)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 4: Identifying Engine Control System Components (3 Of 5)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra