Toyota FJ Cruiser (GSJ 10, 15 series). Manual — part 93
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–327
ES
OK
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 the tester ON.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / PENDING CODES.
(d) Read DTCs.
Result
B
A
NO
YES
Replace the air fuel ratio sensor (See page
NEXT
NEXT
16
REPLACE AIR FUEL RATIO SENSOR
17
PERFORM CONFIRMATION DRIVING PATTERN
18
CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)
Display (DTC Output)
Proceed To
No output
A
P2195, P2196, P2197 or P2198
B
REPLACE ECM AND PERFORM
CONFIRMATION DRIVING PATTERN
19
CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST
CHECK FOR INTERMITTENT PROBLEMS
DTC CAUSED BY RUNNING OUT OF FUEL
20
REPLACE AIR FUEL RATIO SENSOR
21
PERFORM CONFIRMATION DRIVING PATTERN
ES–328
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 / PENDING CODES.
(d) Read DTCs.
Result
B
A
22
CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)
Display (DTC Output)
Proceed To
No output
A
P2195, P2196, P2197 or P2198 (A/F sensor pending DTCs)
B
REPLACE ECM (See page
)
END
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–329
ES
HINT:
•
Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.
•
Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and
located near the engine assembly.
DESCRIPTION
Refer to DTC P2195 (See page
HINT:
•
DTC P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 A/F sensor circuit.
DTC
P2238
Oxygen (A/F) Sensor Pumping Current Circuit
Low (Bank 1 Sensor 1)
DTC
P2239
Oxygen (A/F) Sensor Pumping Current Circuit
High (Bank 1 Sensor 1)
DTC
P2241
Oxygen (A/F) Sensor Pumping Current Circuit
Low (Bank 2 Sensor 1)
DTC
P2242
Oxygen (A/F) Sensor Pumping Current Circuit
High (Bank 2 Sensor 1)
DTC
P2252
Oxygen (A/F) Sensor Reference Ground Circuit
Low (Bank 1 Sensor 1)
DTC
P2253
Oxygen (A/F) Sensor Reference Ground Circuit
High (Bank 1 Sensor 1)
DTC
P2255
Oxygen (A/F) Sensor Reference Ground Circuit
Low (Bank 2 Sensor 1)
DTC
P2256
Oxygen (A/F) Sensor Reference Ground Circuit
High (Bank 2 Sensor 1)
DTC No.
DTC Detection Conditions
Trouble Areas
P2238
P2241
•
Case 1:
Condition (a) or (b) continues for 5.0 seconds or more (2
trip detection logic)
(a) AF+ voltage 0.5 V or less
(b) (AF+) - (AF-) = 0.1 V or less
•
Case 2:
A/F sensor admittance: Less than 0.022 1/
Ω (2 trip
detection logic)
•
Open or short in A/F sensor (bank 1, 2 sensor 1) circuit
•
A/F sensor (bank 1, 2 sensor 1)
•
A/F sensor heater
•
A/F sensor heater relay
•
A/F sensor heater and relay circuits
•
ECM
P2239
P2242
AF+ voltage more than 4.5 V for 5.0 seconds or more (2 trip
detection logic)
P2252
P2255
AF- voltage 0.5 V or less for 5.0 seconds or more (2 trip
detection logic)
P2253
P2256
AF- voltage more than 4.5 V for 5.0 seconds or more (2 trip
detection logic)
ES–330
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
•
DTC P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 A/F sensor circuit.
•
Bank 1 refers to the bank that includes cylinder No. 1.
•
Bank 2 refers to the bank that includes cylinder No. 2.
MONITOR DESCRIPTION
The Air-Fuel Ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. If the A/F sensor
impedance (alternating current resistance) or voltage output deviates greatly from the standard range, the
ECM determines that there is an open or short malfunction in the A/F sensor circuit.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P2238 and P2241 (open circuit between AF+ and AF-):
Related DTCs
P2238: A/F sensor (Bank 1) open circuit between AF+ and AF-
P2238: A/F sensor (Bank 1) short circuit between AF+ and AF-
P2238: A/F sensor (Bank 1) short circuit between AF+ and GND
P2239: A/F sensor (Bank 1) short circuit between AF+ and +B
P2241: A/F sensor (Bank 2) open circuit between AF+ and AF-
P2241: A/F sensor (Bank 2) short circuit between AF+ and AF-
P2241: A/F sensor (Bank 2) short circuit between AF+ and GND
P2242: A/F sensor (Bank 2) short circuit between AF+ and +B
P2252: A/F sensor (Bank 1) short circuit between AF- and GND
P2253: A/F sensor (Bank 1) short circuit between AF- and +B
P2255: A/F sensor (Bank 2) short circuit between AF- and GND
P2256: A/F sensor (Bank 2) short circuit between AF- and +B
Required Sensors/Components (Main)
A/F sensor
Required Sensors/Components (Related)
Engine Coolant Temperature (ECT) sensor, Crankshaft position sensor
Frequency of Operation
Once per driving cycle
Duration
10 seconds: A/F sensor open circuit between AF+ and AF-
5 seconds: Others
MIL Operation
2 driving cycles
Sequence of Operation
None
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, P0174, P0175 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0455, P0456 (EVAP system)
P0500 (VSS)
AF+ terminal voltage
0.5 to 4.5 V
AF- terminal voltage
0.5 to 4.5 V
Difference between AF+ and AF- terminal voltages
0.1 to 0.8 V
ECT
5
°C (41°F) or more
Engine condition
Running
Fuel-cut
OFF
Time after fuel-cut OFF
5 seconds or more
A/F sensor heater
ON
Battery voltage
11 V or more
Ignition switch
ON
Time after ignition switch is OFF to ON
5 seconds or more
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