2001 TOYOTA AVALON check oil

A02397
OCV Signal Waveform
1 m sec./Division5 V/
Division
GND
(A) (A) (A)
DI-128
- DIAGNOSTICSENGINE
284 Author
: Date
:
2001 AVALON (RM808U)
TOYOTA hand-held tester:
1 Check valve timing (See page EM-15).
NG Repair valve timing.
OK
2 Check operation of OCV.
PREPARATION:
(a) Start the engine and warmed it up.
(b) Connect the TOYOTA hand-held tester and select the VVT from the ACTIVE TEST menu.
CHECK:
Check the engine speed when operate the OCV by the TOYOTA hand-held tester.
OK:
OCV is OFF: Normal engine speed
OCV is ON: Rough idle or engine stall
OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG
3 Check voltage between terminals OCV+ and OCV- of ECM connector.
Reference: INSPECTION USING OSCILLOSCOPE
Turn the ignition switch ON, and check the waveform between
terminals OCV+ and OCV- of the ECM connector.
HINT:

The correct waveform is as shown.

The waveform frequency (A) is lengthened as the engine
speed becomes higher.
NG Check and replace ECM (See page IN-30).

- DIAGNOSTICSENGINE
DI-129
285 Author
: Date
:
2001 AVALON (RM808U)
OK
4 Check VVT controller assembly.
PREPARATION:
(a) Remove the timing belt (See page EM-15).
(b) Remove the cylinder head cover.
(c) Remove the OCV (See page EM-31).
(d) Drain oil into the VVT controller assembly (See page EM-31).
CHECK:
Check whether the oil into VVT controller assembly is drained or not.
OK:
The oil into VVT controller assembly is drained.
NG Replace VVT controller assembly, and then go
to step 5.
OK
5 Check OCV (See page SF-51).
NG Replace OCV, and then go to step 6.
OK
6 Check blockage of OCV, oil check valve and oil pipe No.1.
NG Repair or replace.
OK
7 Check whether or not DTC P1349/P1354 is stored.
PREPARATION:
(a) Clear the DTC (See page DI-3).
(b) Perform simulation test.

DI-130
- DIAGNOSTICSENGINE
286 Author
: Date
:
2001 AVALON (RM808U)
CHECK:
Check whether or not DTC P1349/P1354 is stored (See page DI-3).
OK:
DTC P1349/P1354 is not stored.
OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG
Replace ECM
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check valve timing (See page EM-15).
NG Repair valve timing.
OK

A06076
OCV Connector(a)
(b)
A02397
OCV Signal Waveform
1 msec./Division5 V/
Division
GND
(A) (A) (A)
- DIAGNOSTICSENGINE
DI-131
287 Author
: Date
:
2001 AVALON (RM808U)
2 Check operation of OCV.
PREPARATION:
Start the engine.
CHECK:
(a) Check the engine speed when disconnecting the OCV
connector.
(b) Check the engine speed when applying battery positive
voltage between the terminals of the OCV.
RESULT:
ResultCheck (a)Check (b)
1Normal engine speedRough idle or engine stall
2Except 1
2 Go to step 4.
1
3 Check voltage between terminals OCV+ and OCV- of ECM connector.
Reference: INSPECTION USING OSCILLOSCOPE
Turn the ignition switch ON, check the waveform between termi-
nals OCV+ and OCV- of the ECM connector.
HINT:

The correct waveform is as shown.

The waveform frequency (A) is lengthened as the engine
speed becomes higher.
OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG

DI-132
- DIAGNOSTICSENGINE
288 Author
: Date
:
2001 AVALON (RM808U)
Check and replace ECM (See page IN-30).
4 Check VVT controller assembly.
PREPARATION:
(a) Remove the timing belt (See page EM-15).
(b) Remove the cylinder head cover.
(c) Remove the OCV (See page EM-31).
(d) Drain oil into the VVT controller assembly (See page EM-31).
CHECK:
Check whether the oil into VVT controller assembly is drained or not.
OK:
The oil into VVT controller assembly is drained.
NG Replace VVT controller assembly, and then go
to step 5.
OK
5 Check OCV (See page SF-51).
NG Replace OCV, and then go to step 6.
OK
6 Check blockage of OCV, oil check valve and oil pipe No.1.
NG Repair or replace.
OK
7 Check whether or not DTC P1349/P1354 is stored.
PREPARATION:
(a) Clear the DTC (See page DI-3).
(b) Perform simulation test.

- DIAGNOSTICSENGINE
DI-133
289 Author
: Date
:
2001 AVALON (RM808U)
CHECK:
Check whether or not DTC P1349/P1354 is stored (See page DI-3).
OK:
DTC P1349/P1354 is not stored.
OK VVT system is OK.*
*: DTCs P1349 and P1354 are also output after the foreign ob-
ject is caught in some part of the system in the engine oil and
the system returns to normal in a short time. As ECM controls
so that foreign objects are ejected, there is no problem about
VVT. There is also no problem since the oil filter should get the
foreign object in the engine oil.
NG
Replace ECM.

DI-138
- DIAGNOSTICSENGINE
294 Author
: Date
:
2001 AVALON (RM808U)
DTC P1656 OCV Circuit Malfunction (bank 1)
DTC P1663 OCV Circuit Malfunction (bank 2)
CIRCUIT DESCRIPTION
Refer to DTC P1349, P1354 on page DI-127.
DTC No.DTC Detecting ConditionTrouble Area
P1656
P1663Open or short in oil control valve circuit

Open or short in OCV circuit

OCV

ECM
WIRING DIAGRAM
Refer to DTC P1349, P1354 on page DI-127.
INSPECTION PROCEDURE
HINT:

If DTC P1656 dysplayed, check left bank OCV circuit.

If DTC P1663 dysplayed, check right bank OCV circuit.

Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
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 malfunction.
TOYOTA hand-held tester:
1 Check OCV circuit.
PREPARATION:
(a) Start the engine and warmed it up.
(b) Connect the TOYOTA hand-held tester and select the VVT from the ACTIVE TEST menu.
CHECK:
Check the engine speed when operate the OCV by the TOYOTA hand-held tester.
OK:
VVT system is OFF (OCV is OFF): Normal engine speed
VVT system is ON (OCV is ON): Rough idle or engine stalled
OK Check for intermittent problems
(See page DI-3).
NG
DI6TC-01

P00495
Outside
Inside
- DIAGNOSTICSENGINE
DI-9
165 Author
: Date
:
2001 AVALON (RM808U)
NO Proceed to page ST-18, and continue to trouble-
shoot.
YES
3 Does engine start?
NO Go to step 7.
YES
4 Check air filter.
PREPARATION:
Remove the air filter.
CHECK:
Visually check that the air filter is not dirty or excessive oily.
HINT:
If necessary, clean the air filter with compressed air. First blow
from inside thoroughly, then blow from outside of the air filter.
NG Repair or replace.
OK
5 Check idle speed.
PREPARATION:
(a) Warm up the engine to normal operating temperature.
(b) Switch off all the accessories.
(c) Switch off the A/C.
(d) Shift the transmission into the N position.
(e) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3 on the vehicle.
CHECK:
Use the CURRENT DATA to check the idle speed.
OK:
Idle speed: 650 - 750 rpm
NG Proceed to problem symptoms table on page
DI-22.