2005 TOYOTA AVENSIS diagnostic


B12608
A81695
E12
ECM Connector FP+FP±
A81702
S3
High±Pressure Fuel Pump
(Spill Valve) Connector Wire Harness Side
05±412
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
NG REPAIR OR REPLACE A PLACE FUEL LEAKS
OK
5 CHECK FUEL PUMP(HIGH PRESSURE)
(a) With the engine running or cranking, use a sound scope
to check that there is the normal operating sounds of the
fuel pump (high±pressure) when it is operated.
Standard:
There is the operating sounds of the fuel pump (high±
pressure).
NG REPAIR OR REPLACE FUEL PUMP ASSY
OK
6 CHECK HARNESS AND CONNECTOR(ECM ± HIGH PRESSURE FUEL PUMP
(SPILL VALVE))
(a) Disconnect the E12 ECM connector.
(b) Disconnect the S3 high±pressure fuel pump (spill valve)
connector.
(c) Check for continuity between the wire harness side con-
nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
FP+ (E12±6) ± Fuel pump (S3±1)ContinuityFP± (E12±3) ± Fuel pump (S3±2)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
FP+ (E12±6) or Fuel pump (S3±1) ± Body groundNo continuityFP± (E12±3) or Fuel pump (S3±2) ± Body groundNo continuity
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±413
AVENSIS REPAIR MANUAL (RM1018E)
7CHECK IF DTC OUTPUTS REOCCUR(DTC P0191 IS OUTPUT AGAIN)
(a)Clear the DTC (See page 05±294).
(b)Warm up the engine.
(c)Let the engine idle for 30 seconds or more.
(d)Read the DTC (See page 05±294).
Result:
Display (DTC output)Proceed to
ºP0191º is output againA
No DTC outputB
BCHECK FOR INTERMITTENT PROBLEMS
A
8REPLACE FUEL RELIEF VALVE ASSY
GO
9CHECK IF DTC OUTPUTS REOCCUR(DTC P0191 IS OUTPUT AGAIN)
(a)Clear the DTC (See page 05±294).
(b)Warm up the engine.
(c)Let the engine idle for 30 seconds or more.
(d)Read the DTC (See page 05±294). Result:
Display (DTC output)Proceed to
ºP0191º is output againA
No DTC outputB
BSYSTEM OK
A
REPLACE FUEL PUMP ASSY (HIGH PRESSURE)
10CHECK OPERATION OF FUEL PUMP(LOW PRESSURE) (See page 11±33)
OK Go to step 3
NG
11CHECK VOLTAGE FUEL PUMP(LOW PRESSURE) (See page 05±507)
OK Go to step 3
NG
CHECK FOR FUEL PUMP CONTROL CIRCUIT (See page 05±507)

05±414
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
12 CHECK FOR FUEL LEAKS(LOW PRESSURE)
(a) Check if there is leakage in the fuel pipe located between the fuel tank and the high±pressure fuel
pump.
NG REPAIR OR REPLACE A PLACE FUEL LEAKS
OK
REPLACE FUEL PRESSURE REGULATOR ASSY

A14687
(V)
4.5
0.5
(0)019.6
(200)MPa
(kgf/cm2)
Output Voltage
Fuel Pressure
A00309
F16
Fuel Pressure Sensor
18
E13ECM
5V
E1 1 R±W
23
Y±G 2
3
BR28
E2 PRVC
VOUT
GNDE13
E13 VCC 05±406
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0190 FUEL RAIL PRESSURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
The fuel pressure sensor is installed on a fuel delivery pipe and
detects the fuel pressure. It controls of feedback the pump dis-
charge in order to keep the fuel at target pressure 8 to 13 MPa
(81.6 to 132.6 kgf/cm
2, 1,160 to 1,885 psi) by the ECM.
DTC No.DTC Detection ConditionTrouble Area
P0190Open or short in fuel pressure sensor circuit

Open or short in fuel pressure sensor circuit

Fuel pressure sensor

ECM
HINT:
After confirming DTC ºP0190º, use the hand±held tester to confirm the delivery pipe pressure from ºDIAG-
NOSIS / OBD/MOBD / DATA LIST / ALLº.
Fuel Pressure (MPa)Malfunction
Approximately 0
PR circuit short
19.6 or more

VC circuit open or short

PR circuit open

E2 circuit open
WIRING DIAGRAM
05CKE±01

A59674
F16
VCC (+)
GND (±)
Fuel Pressure Sensor Connector Wire Harness Side
VOUT
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±407
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.

Read freeze frame data using the hand±held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean or rich, etc. at
the time of the malfunction.
1 READ VALUE OF HAND±HELD TESTER(FUEL PRESSURE)
(a) Connect the hand±held tester to the DLC3.
(b) Start the engine.
(c) Push the hand±held tester main switch ON.
(d) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / FUEL PRESSº and read its value dis-
played on the hand±held tester.
Pressure: 8 to 13 MPa (81.6 to 132.6 kgf/cm
2, 1,160 to 1,885 psi)
Result:
Fuel Pressure (MPa)Proceed to
19.6 or moreA
0.0B
OK (8 to 13 MPa (81.6 to 132.6 kgf/cm2, 1,160 to 1,885 psi)) (*1)C
*1: The value must be changed when the engine is run or stopped.
B Go to step 3
C CHECK FOR INTERMITTENT PROBLEMS
A
2 INSPECT FUEL PRESSURE SENSOR(VCC VOLTAGE)
(a) Turn the ignition switch ON.
(b) Measure the voltage between the specified terminals of
the F16 fuel pressure sensor connector.
Standard:
Symbols (Terminal No.)Specified condition
VCC (F16±1) ± GND (F16±3)4.5 to 5.5 V
NG Go to step 4
OK

A76903
PR (+)E2 (±)ECM Connector
E13
A81699
VC
E13
ECM Connector
A59674
F16
VCC GND
Fuel Pressure Sensor Connector
Wire Harness Side
VOUT
05±408
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT ECM(PR VOLTAGE)
(a)Start the engine.
(b)Measure the voltage between the specified terminals of the E13 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
PR (E13±23) ± E2 (E13±28)2.1 to 3.2 V at 25
C (77
F)
HINT:
The fuel pressure in the delivery pipe is 8 to 13 MPa (81.6 to
132.6 kgf/cm
2, 1,160 to 1,885 psi)
NGGo to step 5
OK
CHECK AND REPLACE ECM (See page 01±32)
4CHECK HARNESS AND CONNECTOR(ECM ± FUEL PRESSURE SENSOR)
(a)Disconnect the E13 ECM connector.
(b)Disconnect the F16 fuel pressure sensor connector.
(c)Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
VC (E13±18) ± VCC (F16±1)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
VC (E13±18) or VCC (F16±1) ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)

A81699PRE2
E13
ECM Connector
A59674
F16
GND
Fuel Pressure Sensor Connector Wire Harness Side
VOUT
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±409
AVENSIS REPAIR MANUAL (RM1018E)
5 CHECK HARNESS AND CONNECTOR(ECM ± FUEL PRESSURE SENSOR)
(a) Disconnect the E13 ECM connector.
(b) Disconnect the F16 fuel pressure sensor connector.
(c) Check for continuity between the wire harness side con-
nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
PR (E13±23) ± VOUT (F16±2)ContinuityE2 (E13±28) ± GND (F16±3)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
PR (E13±23) or VOUT (F16±2) ± Body groundNo continuity
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE FUEL PRESSURE SENSOR

05±394
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0171 SYSTEM TOO LEAN (BANK 1)
DTC P0172 SYSTEM TOO RICH (BANK 1)
DTC P0174 SYSTEM TOO LEAN (BANK 2)
DTC P0175 SYSTEM TOO RICH (BANK 2)
CIRCUIT DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim in-
cludes the short±term fuel trim and the long±term fuel trim.
The short±term fuel trim is the short±term fuel compensation used to maintain the air±fuel ratio at stoichio-
metric air±fuel ratio. The signal from the heated oxygen sensor indicates whether the air±fuel ratio is RICH
or LEAN compared to the stoichiometric air±fuel ratio. This variance triggers a reduction in the fuel volume
if the air±fuel ratio is RICH, and an increase in the fuel volume if it is LEAN.
The long±term fuel trim is the overall fuel compensation carried out in long±term to compensate for a continu-
al deviation of the short±term fuel trim from the central value, due to individual engine differences, wear over-
time and changes in the operating environment.
If both the short±term fuel trim and the long±term fuel trim are LEAN or RICH beyond a certain value, it is
detected as a malfunction and the CHK ENG is illuminated.
DTC No.DTC Detection ConditionTrouble Area
P0171
P0174When air±fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on LEAN side
(2 trip detection logic)

Air induction system

Injector blockage

Mass air flow meter

Manifold absolute pressure sensor

Engine coolant temperature sensor

Fuel pressure

Gas leakage in exhaust system

Open or short in heated oxygen sensor (bank 1, 2 sensor 1)
circuit

Heated oxygen sensor (bank 1, 2 sensor 1)

Heated oxygen sensor heater (bank 1, 2 sensor 1)

EFI relay

PCV valve and hose

PCV hose connection

ECM
P0172
P0175When air±fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on RICH side
(2 trip detection logic)

Injector leakage blockage

Mass air flow meter

Manifold absolute pressure sensor

Engine coolant temperature sensor

Ignition system

Fuel pressure

Gas leakage in exhaust system

Open or short in heated oxygen sensor (bank 1, 2 sensor 1)
circuit

Heated oxygen sensor (bank 1, 2 sensor 1)

ECM
HINT:

When DTC ºP0171 or P0174º is recorded, the actual air±fuel ratio is on the LEAN side. When DTC
ºP0172 or P0175º is recorded, the actual air±fuel ratio is on the RICH side.

If the vehicle runs out of fuel, the air±fuel ratio is LEAN and DTC ºP0171 or P0174º is recorded. The
CHK ENG then comes on.
05CKD±01