Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 94
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–331
ES
Others:
TYPICAL MALFUNCTION THRESHOLDS
P2238 and P2241 (Open circuit between AF+ and AF-):
P2238 and P2241 (Short circuit between AF+ and GND):
P2238 and P2241 (Short circuit between AF+ and AF-):
P2239 and P2242 (Short circuit between AF+ and +B):
P2252 and P2255 (Short circuit between AF- and GND):
P2253 and P2256 (Short circuit between AF- and +B):
WIRING DIAGRAM
Refer to DTC P2195 (See page
INSPECTION PROCEDURE
HINT:
Intelligent tester only:
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.
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
Battery voltage
11 V or more
Ignition switch
ON
Time after ignition switch is OFF to ON
5 seconds or more
A/F sensor admittance
Below 0.022 1/
Ω
AF+ terminal voltage
0.5 V or less
Difference between AF+ and AF- terminal voltages
0.1 V or less
AF+ terminal voltage
More than 4.5 V
AF- terminal voltage
0.5 V or less
AF- terminal voltage
More than 4.5 V
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
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
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.
•
Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of
both the A/F and HO2 sensors.
•
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.
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.
NG
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 Areas
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
1
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) (See page
)
Tester Display
(Sensor)
Injection Volumes
Status
Voltages
REPLACE AIR FUEL RATIO SENSOR
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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ES
OK
NG
OK
NG
OK
Replace the air fuel ratio sensor (See page
NEXT
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Clear DTCs (See page
).
(d) Start the engine.
(e) Allow the engine to idle for 5 minutes or more.
(f)
Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / PENDING CODES.
(g) Read pending DTCs.
Result
B
A
2
INSPECT AIR FUEL RATIO SENSOR HEATER RELAY (See page
)
REPLACE AIR FUEL RATIO SENSOR
HEATER RELAY
3
CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) (See page
REPAIR OR REPLACE HARNESS OR
CONNECTOR
4
REPLACE AIR FUEL RATIO SENSOR
5
CHECK WHETHER DTC OUTPUT RECURS (DTC P2238, P2239, P2252 OR P2253)
Display (DTC Output)
Proceed To
No output
A
P2238, P2239, P2252 or P2253
B
REPLACE ECM (See page
END
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DTC SUMMARY
HINT:
The leak detection pump is built into the canister pump module.
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) System (See page
).
INSPECTION PROCEDURE
Refer to the EVAP System (See page
MONITOR DESCRIPTION
5 hours
*
after the ignition switch is turned to OFF, the leak detection pump creates negative pressure
(vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP
pressure.
HINT:
*
: If the engine coolant temperature is not below 35
°C (95°F) 5 hours after the ignition switch is turned to
OFF, the monitor check starts 2 hours later. If it is still not below 35
°C (95°F) 7 hours after the ignition
switch is turned to OFF, the monitor check starts 2.5 hours later.
DTC
P2401
Evaporative Emission Leak Detection Pump
Stuck OFF
DTC
P2402
Evaporative Emission Leak Detection Pump
Stuck ON
DTCs
Monitoring Items
Malfunction Detection Conditions
Trouble Areas
Detection
Timings
Detection
Logic
P2401
Leak detection pump
stuck OFF
P043E, P043F, P2401, P2402 and
P2419 present when one of following
conditions met during key-off EVAP
monitor:
•
EVAP pressure just after reference
pressure measurement greater than
-1 kPa-g (-7.5 mmHg-g)
•
Reference pressure less than -4.85
kPa-g (-36.4 mmHg-g)
•
Reference pressure greater than -
1.057 kPa-g (-7.93 mmHg-g)
•
Reference pressure not saturated
•
Reference pressure difference
between first and second 0.7 kPa-g
(5.25 mmHg-g) or more
HINT:
Typical example values
•
Canister pump module
(Reference orifice, leak
detection pump, vent
valve)
•
Connector/wire harness
(Canister pump module -
ECM)
•
EVAP system hose (pipe
from air inlet port to
canister pump module,
canister filter, fuel tank
vent hose)
•
ECM
While ignition
switch OFF
2 trip
P2402
Leak detection pump
stuck ON
•
Canister pump module
(Reference orifice, leak
detection pump, vent
valve)
•
Connector/wire harness
(Canister pump module -
ECM)
•
EVAP system hose (pipe
from air inlet port to
canister pump module,
canister filter, fuel tank
vent hose)
•
ECM
While ignition
switch OFF
2 trip
Sequ
ence
Operations
Descriptions
Duration
-
ECM activation
Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF.
-
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