Toyota FJ Cruiser (GSJ 10, 15 series). Manual — part 92
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–323
ES
•
The ECM stops fuel injection (fuel cut) during engine
deceleration. This causes a lean condition and results in a
momentary increase in the A/F sensor output voltage.
•
The ECM must establish a closed throttle valve position
learning value to perform fuel cut. If the battery terminal
has been reconnected, the vehicle must be driven over 10
mph (16 km/h) to allow the ECM to learn the closed throttle
valve position.
•
When the vehicle is driven:
The output voltage of the A/F sensor may be below 2.8 V
during fuel enrichment. For the vehicle, this translates to a
sudden increase in speed with the accelerator pedal fully
depressed when trying to overtake another vehicle. The A/
F sensor is functioning normally.
•
The A/F sensor is a current output element; therefore, the
current is converted into a voltage inside the ECM.
Measuring the voltage at the connectors of the A/F sensor
or ECM will show a constant voltage result.
NG
OK
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
Replace the air fuel ratio sensor (See page
NEXT
Go to step 10
4
PERFORM CONFIRMATION DRIVING PATTERN
5
CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)
Display (DTC Output)
Proceed To
P2195, P2196, P2197 or P2198
A
No output
B
Go to step 9
6
REPLACE AIR FUEL RATIO SENSOR
ES–324
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
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
NG
OK
NG
OK
7
PERFORM CONFIRMATION DRIVING PATTERN
8
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
9
CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST
CHECK FOR INTERMITTENT PROBLEMS
DTC CAUSED BY RUNNING OUT OF FUEL
10
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) (See page
)
REPLACE AIR FUEL RATIO SENSOR (See
page
)
11
INSPECT AIR FUEL RATIO SENSOR HEATER RELAY (See page
REPLACE AIR FUEL RATIO SENSOR
HEATER RELAY
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–325
ES
(a) Disconnect the B31 or B33 A/F sensor connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage between the +B terminal of the A/F
sensor connector and body ground.
Standard Voltage
(d) Turn the ignition switch OFF.
(e) Disconnect the B2 ECM connector.
(f)
Check the resistance.
Standard Resistance (Check for open)
Standard Resistance (Check for short)
(g) Reconnect the ECM connector.
(h) Reconnect the A/F sensor connector.
12
CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)
B31
Wire Harness Side:
A/F Sensor Connector
B33 Bank 1
Bank 2
Front View
+B
HA1A or HA2A
B2
ECM Connector
HA1A
A1A+ or A2A+
A2A+
A2A-
A1A-
A1A+
HA2A
A1A- or A2A-
A116153E10
Tester Connections
Specified Conditions
+B (B33-2) - Body ground
11 to 14 V
+B (B31-2) - Body ground
Tester Connections
Specified Conditions
HA1A (B33-1) - HA1A (B2-2)
Below 1
Ω
A1A+ (B33-3) - A1A+ (B2-22)
A1A- (B33-4) - A1A- (B2-30)
HA2A (B31-1) - HA2A (B2-1)
A2A+ (B31-3) - A2A+ (B2-23)
A2A- (B31-4) - A2A- (B2-31)
Tester Connections
Specified Conditions
HA1A (B33-1) or HA1A (B2-2) - Body ground
10 k
Ω or higher
A1A+ (B33-3) or A1A+ (B2-22) - Body ground
A1A- (B33-4) or A1A- (B2-30) - Body ground
HA2A (B31-1) or HA2A (B2-1) - Body ground
A2A+ (B31-3) or A2A+ (B2-23) - Body ground
A2A- (B31-4) or A2A- (B2-31) - Body ground
ES–326
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
NG
OK
(a) Check the air induction system for vacuum leakage.
OK:
No leakage from air induction system.
NG
OK
(a) Check the fuel pressure (See page
NG
OK
(a) Check the injector injection (whether fuel volume is high
or low, and whether injection pattern is poor).
NG
Reference (System Diagram of Bank 1 Sensor 1):
From
Battery
From EFI
Relay
A/F HEATER
A/F HEATER
A/F Sensor
ECM
+B
A1A-
Sensor
Heater
A1A+
HA1A
A1A+
A1A-
HA1A
Duty
Control
A133442E01
REPAIR OR REPLACE HARNESS OR
CONNECTOR
13
CHECK AIR INDUCTION SYSTEM
REPAIR OR REPLACE AIR INDUCTION
SYSTEM
14
CHECK FUEL PRESSURE
REPAIR OR REPLACE FUEL SYSTEM
15
INSPECT FUEL INJECTOR ASSEMBLY
REPLACE FUEL INJECTOR ASSEMBLY (See
page
)
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