Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 53
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Clear DTCs (See page
).
(d) Switch the ECM from normal mode to check mode using
the tester (See page
(e) Start the engine and warm it up with all the accessories
switched OFF.
(f) Drive the vehicle at between 38 mph and 75 mph (60 km/h
and 120 km/h) and at an engine speed of between 1,400 rpm
and 3,200 rpm for 3 to 5 minutes.
HINT:
If the system is still malfunctioning, the MIL will be illuminated
during step (f).
NOTICE:
If the conditions in this test are not strictly followed, no
malfunction will be detected.
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.
15
PERFORM CONFIRMATION DRIVING PATTERN
Ignition Switch OFF
Idling
Between
38 and 75 mph
(60 and 120 km/h)
Vehicle Speed
(e)
(f)
Warming up
3 to 5 minutes
Time
(a), (b), (c), (d)
A115372E10
16
CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174 OR P0175)
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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Result
B
A
Display (DTC Output)
Proceed To
No output
A
P0171, P0172, P0174 or P0175
B
Go to step 5
END
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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DESCRIPTION
As shown in the illustration, when the engine is cranked, current flows from terminal ST1 of the ignition
switch into the ECM and the ST (starter) relay coil and also current flows to terminal STA of the ECM (STA
signal).
When the STA signal and NE signal are input to the ECM, Tr1 (power transistor 1) is turned ON, current
flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump, and
the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps the Tr1 ON (circuit opening relay ON)
and the fuel pump also keeps operating.
The fuel pump speed is controlled at two levels (high speed or low speed) by engine condition (starting,
light load, heavy load). When the engine starts (STA ON), Tr2 (power transistor 2) in the ECM is OFF, so
the fuel pump relay closes and positive battery voltage is applied directly to the fuel pump. The fuel pump
operates at high speed.
During idling or under light loads, Tr2 goes ON, and then power is supplied to the fuel pump via the fuel
pump resistor. The fuel pump operates at low speed.
DTC
P0230
Fuel Pump Primary Circuit
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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DTC No.
DTC Detection Conditions
Trouble Areas
P0230
Open or short in fuel pump relay circuit
(1 trip detection logic)
•
Open or short in fuel pump relay circuit
•
Fuel pump relay
•
ECM
IG1
ST1
Battery
Starter
STA
IG2
ST2
ALT
AM2
AM1
AM1
AM2
STA
IGN
C/OPN
EFI
EFI
STA
NE
FC
FPR
MREL
Tr1
Tr2
ECM
Fuel Pump Resistor
FUEL PUMP
Fuel Pump
Clutch
Start
Switch
Park/Neutral
Position
Switch
Ignition Switch
*1
Crankshaft Position
Sensor (NE Signal)
*2: For Manual Transmission
*1: For Automatic Transmission
*1
*2
*2
*2
A133413E01
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