2005 TOYOTA AVENSIS diagnostic

A65174
Ohmmeter
05±432
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
5 INSPECT KNOCK SENSOR
(a) Remove the knock sensor.
(b) Measure the resistance between the terminals.
Resistance: 120 to 280 k
at 20
C (68
F)
NG REPLACE KNOCK SENSOR
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR

± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±415
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0200 INJECTOR CIRCUIT / OPEN
DTC P0201 INJECTOR CIRCUIT / OPEN ± (CYLINDER 1)
DTC P0202 INJECTOR CIRCUIT / OPEN ± (CYLINDER 2)
DTC P0203 INJECTOR CIRCUIT / OPEN ± (CYLINDER 3)
DTC P0204 INJECTOR CIRCUIT / OPEN ± (CYLINDER 4)
CIRCUIT DESCRIPTION
The Electronic Driver Unit (EDU) has been adopted to operate the injector at high speed. The EDU enables
the injector to drive in high±speed rate under high±pressure fuel condition using its internal DC/DC converter
that provides high voltage and quick±charging system.
The ECM constantly monitors the EDU. If the ECM detects abnormal condition, it will stop the engine.
DTC No.DTC Detection ConditionTrouble Area
P0200
No IJF signals to ECM despite crankshaft rotating 10 times
(1 trip detection logic).
P0200No IJF signals to ECM despite crankshaft rotating 20 times
during cranking (2 trip detection logic).
Open or short in EDU circuit

EDU (Injector driver)
P0201
P0202
P0203
P0204
No IJF signals of each cylinder to ECM 20 times successively
(1 trip detection logic).
(j )

Fuel injector assy

ECM
05CKG±01

A76865
ECM
+B 1
E9
W±B 4
2
1
2
12
4A
W±B
Battery
EC 1 3
5
FL MAINB±R
EE (Shielded) 4EFI
No. 1Engine
Room
R/B No. 4
B±W
B±R
Engine Room
R/B No. 4 EFI
Relay
B±Y 44
44
1
4B 1Engine Room
J/B No. 4 B±G
B±GEFI 1
1A 1Engine
Room
R/B No. 1
and
Engine
Room
J/B No. 1GRB±R B±R
B±YB±YB±YGRGR B±R
+B2 2
E9 D
J14
(LHD)(RHD)D
J28D
J14
(LHD)(RHD)D
J28
D
J14D
J28 J/C
B±R 2
IE4
(LHD) (RHD)3
IP1
7
IE3
(LHD) (RHD)7
IO12
IE1
B±YMREL 8
E9
BATT 3
E9
4 IE2V
IREL 35
E10 V
21 5
3INJ
Relay 44
44
R±B
IJF1 25
E13
G±W
#1 1
E13 5
E5
4
E5 IJF
IJT#1
W±R
#2 2
E13 1
E5 IJT#2
R±W
#3 3
E13 2
E5 IJT#3
W±L
#4 4
E13 3
E5 IJT#4
Electronic
Driver Unit
EA1 7Y4
E4 INJ#1
1
2 I 5
Injector No. 1
BR
B±R 3
E4 INJ#4
1
2 I 8
Injector No. 4
BR
BR 5
E4
COM1
P 1
E4 INJ#2
1
2 I 6
Injector No. 2
L
B±W 2
E4 INJ#3
1
2 I 7
Injector No. 3
L
L 6
E4 COM2 B
B (Shielded)
8
E4VB
W7
E4 GND
W±B
EF BR BR 05±416
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM

A76902
E4
EDU Connector Wire Harness Side
GND (±) VB (+)
A76902
E4
EDU Connector Wire Harness Side
INJ#2 COM1INJ#3 INJ#4 INJ#1COM2
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±417
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
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 mal-
function.
1 CHECK INJECTOR DRIVER(POWER SOURCE OF EDU)
(a) Disconnect the E4 EDU connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage between the specified terminals of
the EDU connector.
Symbols (Terminal No.)Specified condition
VB (E4±8) ± GND (E4±7)9 to 14 V
NG CHECK EDU POWER SOURCE CIRCUIT
OK
2 CHECK HARNESS AND CONNECTOR(EDU ± FUEL INJECTOR)
(a) Disconnect the E4 EDU connector.
(b) Measure the resistance between the specified terminals
of the EDU connector.
Standard:
Symbols (Terminal No.)Specified condition
INJ#1 (E4±4) ± COM1 (E4±5)
INJ#2 (E4±1) ± COM2 (E4±6)2 55to2 85
at 20
C (68
F)INJ#3 (E4±2) ± COM2 (E4±6)2.55 to 2.85
at 20
C (68
F)
INJ#4 (E4±3) ± COM1 (E4±5)
NG Go to step 6
OK

A81699
#1
#2
#3
#4
IJF1 E13ECM Connector
A66285
E5
EDU Connector
Wire Harness Side
IJT#2IJT#3IJT#4IJT#1
IJF
A76903
#1
#2
#3
#4
E01
E13
ECM Connector
A81708
Normal Signal Waveform
#1
#3
#4
#2 5V/
Division
05±418
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
3CHECK HARNESS AND CONNECTOR(ECM ± EDU)
(a)Disconnect the E13 ECM connector.
(b)Disconnect the E5 EDU connector.
(c)Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
IJF1 (E13±25) ± IJF (E5±5)
#1 (E13±1) ± IJT#1 (E5±4)
#2 (E13±2) ± IJT#2 (E5±1)Continuity
#3 (E13±3) ± IJT#3 (E5±2)
y
#4 (E13±4) ± IJT#4 (E5±3)
Standard (Check for short):
Symbols (Terminal No.)Specified condition
IJF1 (E13±25) or IJF (E5±5) ± Body ground
#1 (E13±1) or IJT#1 (E5±4) ± Body ground
#2 (E13±2) or IJT#2 (E5±1) ± Body groundNo continuity
#3 (E13±3) or IJT#3 (E5±2) ± Body ground
y
#4 (E13±4) or IJT#4 (E5±3) ± Body ground
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4CHECK ECM(#1, #2, #3 AND #4 VOLTAGE)
(a)Connect an oscilloscope to terminals #1 ± #4 and E01 of the E13 ECM harness side connector.
(b)With the engine cranking or idling, check the signal wave- form.
Standard:
Signal waveform appears as shown in the illustration.
HINT:
Check the waveform before the ECM detects the DTC(s) and
enters the fail±safe mode, because the ECM will no more indi-
cate the voltage output once it enters the fail±safe mode.
NGCHECK AND REPLACE ECM (See page 01±32)
OK

A76903
E01
IJF1E13
ECM Connector
A81709
Normal Signal Waveform
IJF1 2V/
Division
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±419
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK ECM(IJF1 VOLTAGE)
(a)Connect an oscilloscope to terminals IJF1 and E01 of the
E13 ECM harness side connector.
(b)With the engine cranking or idling, check the signal wave- form.
Standard:
Signal waveform appears as shown in the illustration.
HINT:
Check the waveform before the ECM detects the DTC(s) and
enters the fail±safe mode, because the EDU will no more indi-
cate the voltage output once the ECM enters the fail±safe
mode.
NGREPLACE INJECTOR DRIVER
OK
CHECK FOR INTERMITTENT PROBLEMS
6INSPECT FUEL INJECTOR ASSY (See page 11±36)
NG REPLACE FUEL INJECTOR ASSY
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR

A81710
Camshaft
Fuel Relief ValveECM
Fuel Pressure Sensor
Pulsation Damper
Fuel Tank
Fuel Pressure
Regulator Fuel Injector
Spill Valve
High±Pressure Fuel Pump
Low±Pressure
Fuel PumpFuel Delivery Pipe Reference (Fuel system diagram)
Pump
Plunger
High±Pressure Fuel Line Low±Pressure
Fuel Line
Check Valve
05±410
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0191 FUEL RAIL PRESSURE SENSOR CIRCUIT
RANGE/PERFORMANCE
CIRCUIT DESCRIPTION
The high±pressure fuel system consists of the spill valve, pump plunger, check valve, fuel relief valve and
fuel pressure sensor. The spill valve opens and closes the low±pressure fuel line (from the fuel tank), the
pump plunger operated by the camshaft pressurizes fuel, the check valve mechanically opens and closes
the high±pressure fuel line (to the fuel delivery pipe), the fuel relief valve prevents fuel pressure from becom-
ing extremely high, and the fuel pressure sensor located on the fuel delivery pipe monitors fuel pressure.
The high±pressure fuel pump is mounted on the cylinder head cover, and its plunger is operated by the cam
located between #3 and #4 on the intake camshaft. Let the plunger moves up and down by the camshaft
rotations, it produces vacuum to suck fuel and pressurizes the fuel. This fuel then pushes the check valve
open and flows into the fuel delivery pipe. The ECM opens and closes the spill valve to regulate the fuel
pressure to the target fuel pressure 8 to 13 MPa (81.6 to 132.6 kgf/cm
2, 1,160 to 1,885 psi). In order to obtain
and maintain the target pressure, the ECM monitors the fuel pressure using the fuel pressure sensor and
performs the feedback control.
If the internal fuel pressure of the fuel delivery pipe exceeds beyond the standard pressure 14 MPa (142.8
kgf/cm
2, 2,030 psi), the fuel relief valve installed on gateway of the fuel delivery pipe discharges the fuel pres-
sure and then returns the fuel back to the fuel tank.
DTC No.DTC Detection ConditionTrouble Area
P0191
After the fuel pressure is stable for 3 seconds or more, the
following condition (a) or (b) continues for more than 10 se-
conds:
(a) ECM did not command the high±pressure fuel pump to
open the spill valve, but fuel pressure increases 3 MPa
(30.6 kgf/cm
2, 435 psi).
(b) Despite ECM commanded the high±pressure fuel pump to
open the spill valve, fuel pressure decreases 5 MPa (51.0
kgf/cm
2, 725 psi).

Open or short in high±pressure fuel pump (spill valve) circuit

High±pressure fuel pump

Low±pressure fuel pump

Fuel pipe

Fuel relief valve

Fuel pressure regulator

ECM
05CKF±01

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±411
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
Refer to DTC P1235 on page 05±477.
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 OTHER DTC OUTPUT(IN ADDITION TO DTC P0191)
(a)Read the DTC using the hand±held tester.
Result:
Display (DTC output)Proceed to
Only ºP0191º is outputA
ºP0191º and other DTCs are outputB
HINT:
If any other codes besides ºP0191º are output, perform the troublesh\
ooting for those DTCs first.
BGO TO RELEVANT DTC CHART(See page 05±309)
A
2READ 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)
NGGo to step 10
OK
3CHECK FUEL PRESSURE(LOW PRESSURE) (See page 11±33)
NG Go to step 12
OK
4 CHECK FOR FUEL LEAKS(HIGH PRESSURE)
(a) Check if there is leakage in the fuel pipe located between the high±pressure fuel pump and the injec- tors.