diagnostic menu TOYOTA PRIUS 2001 Service Repair Manual

A02397
OCV Signal Waveform
1 m sec./Division5 V/
Division
GND
(A) (A) (A)
DI±122
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
2 Check operation of OCV.
PREPARATION:
(a) Start the engine and warmed it up.
(b) Connect the TOYOTA hand±held tester and select VVT from ACTIVE TEST menu.
CHECK:
Check the engine speed when operate the OCV by the TOYOTA hand±held tester.
OK:
VVT system OFF to ON (OCV OFF to ON):
Engine speed increases.
VVT system ON to OFF (OCV ON to OFF):
Engine is stalled.
HINT:
The change of engine speed lasts only few seconds.
OK VVT system is OK.*
*: DTC P1349 is also output after the foreign object is caught
in some part of the system in the engine oil and the system re-
turns 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, check 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±41).
OK

DI±150
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
DTC P1656 OCV Circuit Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P1349 on page DI±121.
DTC No.DTC Detecting ConditionTrouble Area
P1656
P1663Open or short in oil control valve circuit

Open or short in oil control valve circuit

Oil control valve

ECM
WIRING DIAGRAM
Refer to DTC P1349 on page DI±121.
INSPECTION PROCEDURE
HINT:
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 warmed up or not, the air±fuel ratio 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 VVT from 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
DI6VO±02

I15593
I17110
Concealed
touch
switch
± DIAGNOSTICSNAVIGATION SYSTEM
DI±797
2001 PRIUS (RM778U)
(a) DIAGNOSIS START±UP
To start the diagnosis menu, there are 2 ways: using a
diagnosis check wire and using a switch.
(b) START±UP BY SWITCH OPERATION
(1) Vehicle speed is 0 km/h (0 mph).
(2) Parking brake switch is pressed.
(3) Press the Display switch to display the Screen Ad-
justment screen.
(4) Repeatedly touch the upper and lower bottom parts
of the left end of the screen 3 times.
(c) FINISHING DIAGNOSIS SYSTEM MODE
Turn the ignition switch from ACC to OFF to finish the
mode. If it is started by switch operation.

I15446
to 1. Diagnosis
MENU screenDTC memory and history clear
DTC memory clear
Recheck
DTC clearWhen there are individual DTC data.Ye s
No DI±798
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
2. SERVICE CHECK MODE
HINT:
Service Check Mode is operated as follows.

I15447
Recheck
Memory clear switch DTC clear switch
Check result Components nameDiagnosis MENU
screen switch
± DIAGNOSTICSNAVIGATION SYSTEM
DI±799
2001 PRIUS (RM778U)
(a) SERVICE CHECK SCREEN
(1) By performing system check and collecting data of diagnosis memory, this mode checks the cur-
rent and past condition of the vehicle.
(2) List of all components name or physical addresses.
It displays only the components that have been connected at least once.
(3) The check result is displayed for all components.
(4) The check result is displayed by 6 abbreviations: ºOKº, ºEXCHº, ºCHEKº, ºNCONº, ºNRESº and
ºOldº. (ºEXCHº, ºCHEKº and ºOldº have a function as switches.)
(5) Based on all information obtained from ºSystem Check Requestº, ºDiagnosis Memory Requestº
and ºCurrent Diagnosis Resultº command, the following results are displayed:
OK: No error is identified.
EXCH: One or more error codes requesting for exchange are detected in any check result.
CHEK: Except the conditions for ºEXCHº, one or more error codes requesting for check are de-
tected in any check result.
(6) The other check results are as follows:
NCON: No response to ºDiagnosis ON Instructionº command and it is not connected when the
system is started.
Old: One or more error codes are detected when responding to ºDiagnosis ON Instructionº com-
mand because of the old version .
NRES: No response to all commands of ºSystem Check Requestº, ºDiagnosis Memory Requestº
and ºCurrent Diagnosis Resultº. Or no error is detected by any one of ºSystem Check Requestº
or ºDiagnosis Memory Requestº when no response to the other command.
(7) ºEXCHº, ºCHEKº and ºOldº are functioned as switches any by pressing these, LAN Check Mode
and Unit Check Mode are activated.
(8) Memory Clear Switch
Pressing this switch for 3 sec. deletes all information about master component registration and
diagnosis memory of all components.
(9) DTC Clear Switch
Pressing this switch for 3 sec. deletes diagnosis memory of all components.
(10) Recheck Switch
Pressing this switch rechecks the system.
(11) Menu Switch
Pressing this switch activated the Diagnosis Menu Screen.

I17100
to 1. Diagnosis
MENU screen
The Microphone Check screen is not
applicable to the Prius. DI±802
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
3. NAVIGATION CHECK MODE
HINT:
Navigation Check Mode is operated as follows.

I17095
Diagnosis MENU
screen switch GPS information
mode screen switch
Vehicle sensor mode
screen switch
Color bar check
mode screen switch
± DIAGNOSTICSNAVIGATION SYSTEM
DI±803
2001 PRIUS (RM778U)
(a) NAVIGATION CHECK MODE SCREEN
(1) Various check screens for the Navigation ECU can be started from this menu screen.
(2) GPS Information Mode Screen Switch
Pressing this switch activates GPS Information Mode Screen.
(3) Vehicle Sensor Mode Screen Switch
Pressing this switch activates the Vehicle Signal Mode screen.
(4) Color Bar Check Mode Screed Switch
Pressing this switch activates the Color Bar Check Mode screen.
(5) Diagnosis Menu Screen Switch
Pressing this switch activates the Diagnosis Menu screen.

I17097
Navigation check
screen switch
± DIAGNOSTICSNAVIGATION SYSTEM
DI±805
2001 PRIUS (RM778U)
(c) VEHICLE SIGNAL CHECK MODE SCREEN
(1) Status of the vehicle sensor which are input to the Navigation ECU is checked in this screen.
HINT:
Data are updated every 1 sec.
(2) ACC signal status: Displayed as ON/OFF.
(3) REV signal status: Displayed as ON/OFF.
(4) SPD signal status: The following is displayed:

The cumulative value of the input pulse after displaying this screen. (shown in 5 digits)

Vehicle speed (Unit: km/h, mph)
(5) Output condition of the gyro sensor: The following is displayed:

Voltage (Unit: mV, LSB: 1mV)

Relative azimuthal angle to the current point (0 degree).
Assuming the angle at a point when this screen is activated as 0 degree.
(6) Navigation Check Menu Screen Switch
Pressing this switch displays the Navigation Check screen.

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to 1. Diagnosis MENU
mode screen switch
± DIAGNOSTICSNAVIGATION SYSTEM
DI±807
2001 PRIUS (RM778U)
4. DISPLAY CHECK MODE
HINT:
Display Check Mode is operated as follows.

I15453
to 1. Diagnosis MENU
screen switch Color bar
check mode switch
Touch switch
check mode switch
Touch point
check mode switch
Vehicle signal
check mode switch
DI±808
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
(a) DISPLAY CHECK MENU SCREEN
(1) Various screens to check the display are started from this screen.
(2) Color Bar Check Mode Switch
Pressing this switch activates the Color Bar Check Mode screen.
(3) Touch Switch Check Mode Switch
Pressing this switch activates the Touch Switch Check Mode screen.
(4) Touch Point Check Mode Switch
Pressing this switch activates the Touch Point Check Mode screen.
(5) Vehicle Signal Check Mode Switch
Pressing this switch activates the Vehicle Signal Check Mode screen.
(6) Diagnosis MENU Screen Switch
Pressing this switch activates the Diagnosis MENU screen.