Toyota 2GR-FE Manual page 456

ES–300
The ECM monitors the intake air amount during idling and the ignition timing.
When the Engine Coolant Temperature (ECT) is between -10°C and 50°C (14°F and 122°F), the ECM
calculates the idling intake air amount for 10 seconds, beginning 3 seconds after the engine starts.
When the accumulated value is below the threshold, the ECM interprets this as a malfunction in the Idle
Speed Control (ISC) system at cold start.
The ECM also monitors the ignition timing at cold start, and judges it to be incorrect when it is advanced to
the same value for a warm engine for 5 seconds or more of the 10 second monitoring period.
Example:
P050A is detected when all conditions below are met (2 trip detection logic).
1. The ECT is between -10°C and 50°C (14°F and 122°F) when the engine starts.
2. The engine idles for 13 seconds after engine start.
3. The accumulated intake air amount is below the threshold.
The ECM sets the DTC and illuminates the MIL 13 seconds after the engine is next started.
NOTICE:
When the negative battery terminal is disconnected during inspection or repairs, the ISC learning
ES
values are cleared. The ISC learning must be performed by warming up the engine and idling for 5
minutes with the ECT at 75°C (167°F) or more because DTCs cannot be detected with the ISC
learning values cleared.
MONITOR STRATEGY
Related DTCs
Required Sensors/Components (Main)
Required Sensors/Components (Related)
Frequency of Operation
Duration
MIL Operation
Sequence of Operation
TYPICAL ENABLING CONDITIONS
P050A:
Battery voltage
Time after engine start
Starter
ECT at engine start
ECT
Engine idling time
Fuel-cut
Vehicle speed
Time after shift position changed
Atmospheric pressure
P050B:
Battery voltage
Time after engine start
Starter
ECT at engine start
ECT
Engine idling time
Fuel-cut
Vehicle speed
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
P050A: Idle speed control problem at cold
P050B: Idle ignition timing problem at cold
Mass air flow meter
Engine Coolant Temperature (ECT) sensor, Throttle position sensor,
Vehicle speed sensor
Once per driving cycle
10 seconds
2 driving cycles
None
8 V or more
3 seconds or more
OFF
-10°C (14°F) or more
-10°C to 50°C (14°F to 122°F)
3 seconds or more
OFF
Less than 1.875 mph (3 km/h)
1 second or more
76 kPa (570 mmHg) or more
8 V or more
3 seconds or more
OFF
-10°C (14°F) or more
-10°C to 50°C (14°F to 122°F)
3 seconds or more
OFF
Less than 1.875 mph (3 km/h)