Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 76
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–259
ES
(a) Check the throttle valve condition.
OK:
Throttle valve is not contaminated with foreign
objects and moves smoothly.
NG
OK
4
CHECK THROTTLE VALVE
REPAIR OR REPLACE THROTTLE WITH
MOTOR BODY ASSEMBLY
REPLACE ECM (See page
)
ES–260
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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 duration 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 Start
Engine Start
Threshold
Threshold
Pass Detected
P050A Detected
0
3
10
(Second)
3
10
(Second)
Time
5 or more
P050B Detected
Pass Detected
(g)
Time
A112588E01
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–261
ES
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
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
TYPICAL ENABLING CONDITIONS
P050A:
P050B:
Related DTCs
P050A: Idle speed control problem at cold
P050B: Idle ignition timing problem at cold
Required Sensors/Components (Main)
Mass air flow meter
Required Sensors/Components (Related)
Engine Coolant Temperature (ECT) sensor, Throttle position sensor,
Vehicle speed sensor
Frequency of Operation
Once per driving cycle
Duration
10 seconds
MIL Operation
2 driving cycles
Sequence of Operation
None
Battery voltage
8 V or more
Time after engine start
3 seconds or more
Starter
OFF
ECT at engine start
-10
°C (14°F) or more
ECT
-10
°C to 50°C (14°F to 122°F)
Engine idling time
3 seconds or more
Fuel-cut
OFF
Vehicle speed
Less than 1.875 mph (3 km/h)
Time after shift position changed (A/T)
1 second or more
Atmospheric pressure
76 kPa (570 mmHg) or more
Battery voltage
8 V or more
Time after engine start
3 seconds or more
Starter
OFF
ECT at engine start
-10
°C (14°F) or more
ECT
-10
°C to 50°C (14°F to 122°F)
Engine idling time
3 seconds or more
Fuel-cut
OFF
Vehicle speed
Less than 1.875 mph (3 km/h)
ES–262
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL MALFUNCTION THRESHOLDS
P050A:
P050B:
INSPECTION PROCEDURE
HINT:
Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data, from the time the malfunction occurred.
(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Select the following the menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTCs.
Result
HINT:
If any DTCs other than P050A and P050B are output,
troubleshoot those DTCs first.
B
A
HINT:
Calculate the total fuel trim values to check the characteristic
deviation of the mass air flow meter.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY / SHORT
FT #1 and LONG FT #1, or SHORT FT #2 and LONG FT
#2.
(e) Read the values displayed on the tester.
(f)
Add together the SHORT FT #1 and LONG FT #1, or
SHORT FT #2 and LONG FT #2 values to obtain the
total FUEL TRIM.
Accumulated air flow amount (M/T)
Varies with ECT (Example: Less than 42.5 g)
Accumulated air flow amount (A/T)
Varies with ECT (Example: Less than 47.5 g)
Accumulated time when ignition timing retard value insufficient
5 seconds or more
1
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A AND/OR P050B)
Display (DTC Output)
Proceed To
P050A and/or P050B
A
P050A and/or P050B and other DTCs
B
GO TO DTC CHART (See page
2
READ VALUE USING INTELLIGENT TESTER (FUEL TRIM)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст