2005 TOYOTA AVENSIS fuel pressure

+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Case 1
Case 2
Case 3
Case 4
Output voltage of heated oxygen
sensor (sensor 1: front sensor)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2: rear sensor)Mainly suspect
trouble area
OK
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
Sensor 1: front sensor
(sensor 1, heater, sensor 1
circuit)
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
±12.5 %
Injection volume
Output voltage
NG
+25 %
±12.5 %
Injection volume
Output voltage
NG
+25 %
±12.5 %
Injection volume
Output voltage
NG
+25 %
±12.5 %
Injection volume
Output voltage
NGExtremely rich or lean actual
air±fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
No reaction
No reaction
No reaction No reaction

Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±367
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Hand±held tester only:
Narrowing down the trouble area is possible by performing the ºA/F CONTROLº ACTIVE TEST (heated oxy-
gen sensor or other trouble areas can be distinguished).
(a) Perform ACTIVE TEST using the hand±held tester (A/F CONTROL).
HINT:
ºA/F CONTROLº is an ACTIVE TEST which changes the injection volume ±12.5 % or +25 %.
(1) Connect the hand±held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 90 sec.
(4) Select the item ºDIAGNOSIS / OBD/MOBD / ACTIVE TEST / A/F CONTROLº.
(5) Perform ºA/F CONTROLº with the engine in an idle condition (press the right or left button).
Result:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 %
rich output: More than 0.55 V
±12.5 %
lean output: Less than 0.4 V
NOTICE:
There is a few seconds delay in the sensor 1 (front sensor) output. And there is about 20 seconds
delay in the sensor 2 (rear sensor).

05±372
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
8CHECK AIR INDUCTION SYSTEM
(a)Check for vacuum leaks in the air induction system. NGREPAIR OR REPLACE AIR INDUCTION SYSTEM
OK
9CHECK FUEL PRESSURE(LOW PRESSURE) (See page 11±33)
NGCHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND
FILTER
OK
10CHECK FUEL PRESSURE(HIGH PRESSURE) (See page 11±33)
NGCHECK AND REPLACE FUEL PUMP, FUEL PRESSURE SENSOR, WIRING AND FUEL
LEAKAGE
OK
11CONFIRM IF ANY MISFIRING DTCS WERE PRESENT AT STEP 1
(a)Misfiring DTC ºP0301, P0302, P0303 and/or P0304º was present at step 1. NOREPLACE HEATED OXYGEN SENSOR
YES
12REPLACE FUEL INJECTOR ASSY (See page 11±42)
HINT:
If one or more the misfiring DTCs ºP0301, P0302, P0303 and/or P0304º\
were present at step 1, replace the
injector(s) mounted on the misfiring cylinder(s) that is referred by the DTC(s)\
with normal injector(s). GO
13 PERFORM CONFIRMATION DRIVING PATTERN
HINT:
Clear all DTCs prior to performing the confirmation driving pattern.GO

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±463
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using
\b\b
\b 
\f
reeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, it is useful for determi\
ning whether the vehicle was running
or stopped, the engine was warmed up or not, the air±fuel ratio was lea\
n or rich, etc. at the time of the mal-
function.
1CHECK OTHER DTC OUTPUT(IN ADDITION TO P0556)
(a)Read the DTC using the hand±held tester. Result :
DisplayProceed to
Only ºP0556º is output.A
ºP0556º and other DTCs are output.B
HINT:
If any other codes besides ºP0556º are output, perform the troublesh\
ooting for those DTCs first.
BGO TO RELEVANT DTC CHART(See page 05±309)
A
2 READ VALUE OF HAND±HELD TESTER(INTAKE MANIFOLD ABSOLUTE PRESSURE)
(a) Connect the hand±held tester to the DLC3.
(b) Warm up the engine.
(c) Push the hand±held tester main switch ON.
(d) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / MAPº and read its value displayed on
the hand±held tester with the shift lever is the ºNº position.
Standard :
ConditionIntake Manifold Absolute Pressure
Ignition switch ON (do not start engine)70 to 110 kPa (525 to 825 mmHg, 20.7 to 32.5 in.Hg)
Running without load (2,500 rpm)20 to 35 kPa (150 to 263 mmHg, 5.9 to 10.4 in.Hg)
NG Go to step 7
OK
3 READ VALUE OF HAND±HELD TESTER(STOP LIGHT SWITCH)
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(c) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / STOP LIGHT SWº and read its value displayed on the hand±held tester.
Result :
Brake PedalSTP Signal
DepressedON
ReleasedOFF

A76903
E2 (±)VC (+)
ECM Connector
E13
A76903
PB (+)E2 (±)
ECM Connector
E13
05±460
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
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 deter\
mining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ra\
tio was lean or rich, etc. at
the time of the malfunction.
1CHECK VACUUM HOSE(BRAKE BOOSTER PRESSURE SENSOR ± BRAKE BOOSTER, INTAKE MANIFOLD ± BRAKE BOOSTER)
(a)Check that the vacuum hoses are connected correctly.
(b)Check that the vacuum hoses are not loose or disconnected.
(c)Check the vacuum hoses and tubes for clogs, cracks, holes, damage, or bl\
ockage.
NGREPAIR OR REPLACE VACUUM HOSE
OK
2INSPECT ECM(VC VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the specified terminals of the E13 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
VC (E13±18) ± E2 (E13±28)4.5 to 5.5 V
NGCHECK AND REPLACE ECM (See page 01±32)
OK
3 INSPECT ECM(PB VOLTAGE)
(a) Measure the voltage between the specified terminals of the E13 ECM connector.
Standard:
Symbols (Terminal No.)ConditionSpecified condition
PB (E13±26) ±
E2 (E13 28)
Ignition switch ON
(do not start engine)
0.5 to 4.5 VE2 (E13±28)Idling
0.5 to 4.5 V
NG Go to step 4
OK
CHECK FOR INTERMITTENT PROBLEMS

A76876
ECM
J13G
FP+ 6
R
E12
D(Shielded)
J13 E
J12 E J12D
BRBR
EEJ/C21 S3
Fuel Pump
(High Pressure)
(Spill Valve)
G
FP± 3
E12
(Shielded) BR
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±477
AVENSIS REPAIR MANUAL (RM1018E)
DTC P1235 HIGH PRESSURE FUEL PUMP CIRCUIT
CIRCUIT DESCRIPTION
The fuel pump (high pressure) is an electronically controlled plunger type fuel pump (high pressure) which
is driven by the cam provided on the intake cam shaft rear end on the cylinder head.
The fuel pump (high pressure) increases the pressure of the fuel fed from the fuel pump (low pressure) in
the fuel tank at 8 to 13 MPa (81.6 to 132.6 kgf/cm
2, 1,160 to 1,885 psi) according to the operating condition,
and it feeds the fuel to the fuel delivery pipe.
DTC No.DTC Detection conditionTrouble Area
O h ti f l (hi h ) i itf 1
Open or short in fuel pump (high pressure)
P1235Open or short in fuel pump (high pressure) circuit for 1sec. or
more

Oen or short in fuel um (high ressure)

Fuel pump (high pressure)P1235moreFuel um (high ressure)

ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand±held tester. Freeze frame data records the engine conditions when the
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 mal-
function.
05CK4±01


B12608
A76903
E12
ECM Connector
FP+
FP± E1
E11
A14558
Normal Signal Waveforms
5 msec./Division 10 V/
Division
GND FP±
FP+
05±478
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
1CHECK OPERATION OF 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).
NGREPLACE FUEL PUMP (HIGH PRESSURE)
OK
2INSPECT ECM(FP+ AND FP± VOLTAGE)
(a)Turn the ignition switch ON, and check the waveforms be- tween terminals FP+ and E1, and FP± and E1 of the E11
and E12 ECM connectors.
HINT:
The correct waveform is as shown in the illustration.
NGCHECK AND REPLACE ECM (See page 01±32)
OK
3CHECK FUEL PUMP(HIGH PRESSURE) (See page 11±33)
NG REPLACE FUEL PUMP(HIGH PRESSURE)
OK

A81695
E12
ECM Connector FP+FP±
A81702
S3
Fuel Pump Connector
(High Pressure) Wire Harness Side
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±479
AVENSIS REPAIR MANUAL (RM1018E)
4 CHECK HARNESS AND CONNECTOR(FUEL PUMP (HIGH PRESSURE) ± ECM)
(a) Disconnect the E12 ECM connector.
(b) Disconnect the S3 fuel pump (high pressure) 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
CHECK FOR INTERMITTENT PROBLEMS

054JF±04
±
DIAGNOSTICS ECD SYSTEM (1CD±FTV)
05±551
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
When the malfunction code is not confirmed the DTC check and the problem sti\
ll can not be confirmed in
the basic inspection, then proceed to this step and perform troubleshooting\
according to the numbered order
given in the table below.
SymptomSuspect AreaSee page
Does not crank (Difficult to start)
2. Starter
3. Starter relay
4. Engine coolant temperature sensor19±22
19±22
10±56
Difficult to start with a cold engine
1. STA signal circuit
2. Injector
3. Fuel filter
4. Compression
5. EC

6. Supply pump
7. Fuel pressure sensor
8. Diesel throttle
9. Glow plug system05±691 11±56
11±82
14±266 10±56
10±56
10±56
10±56
10±56
Difficult to start with a warm engine
1. STA signal circuit
2. Injector
3. Fuel filter
4. Compression
5. EC

6. Supply pump
7. Fuel pressure sensor
8. Diesel throttle05±691 11±56
11±82
14±266 10±56
10±56
10±56
10±56
Engine stalls soon after starting
1. Fuel filter
2. Injector
3. EC
power source circuit
4. EC

5. Supply pump
6. Fuel pressure sensor
7. Diesel throttle11±82
11±56
05±686 10±56
10±56
10±56
10±56
Engine stalls (Other than conditions listed abobe)
1. EC
power source circuit
2. Injector
3. EC

4. Supply pump
5. Fuel pressure sensor
6. Diesel throttle05±686 11±56
10±56
10±56
10±56
10±56
Incorrect first idle (Poor idling)
1. Fuel filter
2. Injector
3. EC

4. Supply pump
5. Fuel pressure sensor11±82
11±56
10±56
10±56
10±56
High engine idle speed (Poor idling)
1. A/C signal circuit
2. Injector
3. STA signal circuit
4. EC

5. Supply pump
6. Fuel pressure sensor55±3
11±56
05±691 10±56
10±56
10±56