Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 48
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–147
ES
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
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.
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 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
ES–148
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
•
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:
•
If other DTCs relating to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may have an open circuit.
•
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.
•
If the OX1B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 will be set.
•
If the OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0156 will be set.
(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
C
A
(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 / DATA LIST / PRIMARY / O2S
B1S2 or O2S B2S2.
(d) Allow the engine to idle.
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
READ OUTPUT DTCS
Case
A/F Sensor (Sensor 1)
Output Voltage
HO2 Sensor (Sensor 2)
Output Voltage
Main Suspected
Trouble Areas
Display (DTC Output)
Proceed To
P0138 or P0158
A
P0137 or P0157
B
P0136 or P0156
C
Go to step 14
Go to step 7
2
READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF HEATED OXYGEN
SENSOR)
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–149
ES
(e) Read the Heated Oxygen (HO2) sensor output voltage
while idling.
Result
B
A
(a) Turn the ignition switch OFF and wait for 5 minutes.
(b) Disconnect the B1 or B2 ECM connector.
(c) Check the resistance.
Standard Resistance
(d) Reconnect the ECM connector.
NG
OK
(a) Disconnect the B34 or B36 HO2 sensor connector.
(b) Check the resistance.
Standard Resistance
(c) Reconnect the HO2 sensor connector.
NG
OK
HO2 Sensor Output Voltages
Proceed To
More than 1.2 V
A
Less than 1.0 V
B
Go to step 5
3
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
B1
ECM Connector
B2
HT1B
OX1B
HT2B
OX2B
G035620E11
Tester Connections
Specified Conditions
HT1B (B1-1) - OX1B (B1-18)
10 k
Ω or higher
HT2B (B2-5) - OX2B (B2-33)
Go to step 4
REPLACE ECM (See page
)
4
INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)
Component Side:
HO2 Sensor
+B
OX1B or
OX2B
B36
1
2
3
4
Bank 2
Bank 1
E2
B34
Front View
A062378E38
Tester Connections
Specified Conditions
+B (2) - E2 (4)
10 k
Ω or higher
+B (2) - OX1B or OX2B (3)
REPLACE HEATED OXYGEN SENSOR (See
page
REPAIR OR REPLACE HARNESS OR CONNECTOR
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
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
(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Start the engine.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY / O2S
B1S2 or O2S B2S2.
(e) After warming up the engine, run the engine at an engine
speed of 2,500 rpm for 3 minutes.
(f)
Read the output voltage of the HO2 sensor when the
engine rpm is suddenly increased.
HINT:
Quickly accelerate the engine to 4,000 rpm 3 times using
the accelerator pedal.
Standard:
Fluctuates between 0.4 V or less and 0.5 V or more.
NG
OK
5
PERFORM CONFIRMATION DRIVING PATTERN
6
CHECK WHETHER DTC OUTPUT RECURS (DTC P0138 OR P0158)
Display (DTC Output)
Proceed To
P0138 or P0158
A
No output
B
CHECK FOR INTERMITTENT PROBLEMS
REPLACE HEATED OXYGEN SENSOR (See page
)
7
READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF HEATED OXYGEN
SENSOR)
Go to step 14
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