Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 99
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–351
ES
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page
WIRING DIAGRAM
Refer to DTC P2195 (See page
INSPECTION PROCEDURE
HINT:
Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE
TEST. The A/F CONTROL function can help to determine whether the Air-Fuel Ratio (A/F) sensor, Heated
Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL operation using an intelligent
tester.
(1) Connect an intelligent tester to the DLC3.
(2) Start the engine and turn the tester ON.
(3) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
(4) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT
button to change the fuel injection volume).
(6) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and
O2S B2S2) displayed on the tester.
Monitor runs whenever following DTCs not present
P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for Closed Loop)
P0171, P0172 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340, P0341 (CMP sensor)
P0455, P0456 (EVAP system)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
Active A/F control
Performing
Active A/F control performed when following conditions met
-
Battery voltage
11 V or more
Engine coolant temperature
75
°C (167°F) or more
Idling
OFF
Engine RPM
Less than 4,000 rpm
A/F sensor status
Activated
Fuel-cut
OFF
Engine load
10 to 70 %
Shift position
2 or more
Catalyst monitor
Not yet
Intake air amount
3 to 10.5 g/sec
Response rate deterioration level
Less than 0.2 V
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
HINT:
•
The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection
volume by 25 %.
•
Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
Standard
NOTICE:
The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen
(HO2) sensor has a maximum output delay of approximately 20 seconds.
•
To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II
/ ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S
B2S2, and press the YES button and then the ENTER button followed by the F4 button.
•
Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of
both the A/F and HO2 sensors.
HINT:
•
DTC P2A00 or P2A03 may be also set, when the air-fuel ratio is stuck rich or lean.
Tester Display
(Sensor)
Injection Volumes
Status
Voltages
AFS B1S1 or AFS B2S1
(A/F)
+25 %
Rich
Less than 3.0
AFS B1S1 or AFS B2S1
(A/F)
-12.5 %
Lean
More than 3.35
O2S B1S2 or O2S B2S2
(HO2)
+25 %
Rich
More than 0.55
O2S B1S2 or O2S B2S2
(HO2)
-12.5 %
Lean
Less than 0.4
Case
A/F Sensor (Sensor 1)
Output Voltage
HO2 Sensor (Sensor 2)
Output Voltage
Main Suspected Trouble
Area
1
Injection volume
+25 %
-12.5 %
Injection volume
+25 %
-12.5 %
-
Output voltage
More than 3.35 V
Less than 3.0 V
Output voltage
More than 0.55 V
Less than 0.4 V
2
Injection volume
+25 %
-12.5 %
Injection volume
+25 %
-12.5 %
•
A/F sensor
•
A/F sensor heater
•
A/F sensor circuit
Output voltage
Almost
no reaction
Output voltage
More than 0.55 V
Less than 0.4 V
3
Injection volume
+25 %
-12.5 %
Injection volume
+25 %
-12.5 %
•
HO2 sensor
•
HO2 sensor heater
•
HO2 sensor circuit
Output voltage
More than 3.35 V
Less than 3.0 V
Output voltage
Almost
no reaction
4
Injection volume
+25 %
-12.5 %
Injection volume
+25 %
-12.5 %
•
Injector
•
Fuel pressure
•
Gas leakage from
exhaust system
(Air-fuel ratio extremely
lean or rich)
Output voltage
Almost
no reaction
Output voltage
Almost
no reaction
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–353
ES
•
A low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that would
cause the engine to run rich.
•
A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that would
cause the engine to run lean.
•
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 menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
Result
HINT:
If any DTCs other than P2A00 or P2A03 are output,
troubleshoot those DTCs first.
B
A
NG
OK
NG
OK
NEXT
1
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)
Display (DTC Output)
Proceed To
P2A00 and/or P2A03
A
P2A00 and/or P2A03 and other DTCs
B
GO TO DTC CHART (See page
)
2
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) (See page
REPLACE AIR FUEL RATIO SENSOR (See
page
3
CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) (See page
REPAIR OR REPLACE HARNESS OR
CONNECTOR
4
PERFORM CONFIRMATION DRIVING PATTERN
ES–354
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d) Read DTCs.
Result
B
A
Replace the air fuel ratio sensor (See page
).
NEXT
NEXT
(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d) Read DTCs.
Result
B
A
5
CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)
Display (DTC Output)
Proceed To
P2A00 and/or P2A03
A
No output
B
CHECK FOR INTERMITTENT PROBLEMS
6
REPLACE AIR FUEL RATIO SENSOR
7
PERFORM CONFIRMATION DRIVING PATTERN
8
CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)
Display (DTC Output)
Proceed To
No output
A
P2A00 and/or P2A03
B
CHECK EXTREMELY RICH OR LEAN
ACTUAL AIR FUEL RATIO (REFER TO DTC
P0171 PROCEDURE)
END
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