2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–299
ES
DESCRIPTION
The Electronic Throttle Control System (ETCS) controls the engine idling speed. The ETCS operates the
throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the
target idling speed.
In addition, the ECM retards the ignition timing and the ETCS increases the intake air amount to quickly
increase the catalyst temperature at cold start to reduce emissions.
MONITOR DESCRIPTION
DTC P050A Cold Start Idle Air Control System Performance
DTC P050B Cold Start Ignition Timing Performance
DTC No. DTC Detection Conditions Trouble Areas
P050A
Accumulated intake air amount during 10 seconds of idling
after cold start, less than threshold (2 trip detection logic)
• Throttle body assembly
• Mass air flow meter
• Air induction system
• PCV hose connections
• VVT system
• Air cleaner filter element
•ECM
P050B
Ignition timing retard value insufficient for 5 seconds or more
during 10 seconds of P050A monitoring at cold start (2 trip
detection logic)
• Throttle body assembly
• Mass air flow meter
• Air induction system
• PCV hose connections
• VVT system
• Air cleaner filter element
•ECM
Accumulated Intake Air Value
Ignition Timing
Advanced
Retarded
Engine StartEngine Start
Threshold Threshold
Pass Condition Detected
P050A Detected
0
3
10
(Second)
3
10
(Second)
Time
5 or more
P050B Detected
Pass Condition Detected
(g)
Time
A112588E02
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