2001 TOYOTA PRIUS AUX

DI±334
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
2001 PRIUS (RM778U) 4/27/01
5 Check insulating resistance of power cable.
PREPARATION:
(a) Under step 3 condition, turn the ignition switch OFF and disconnect the negative terminal of the auxilia-
ry battery.
(b) Remove the service plug.
(c) Disconnect the 2 power cables from the converter & inverter.
(d) Disconnect the 2 power cables from the HV battery.
CHECK:
Using a megger (500V), measure the insulating resistance between the power cable and body ground.
OK:
Insulating resistance: 10MW or more
NG Replace the power cable.
OK
6 Check insulating resistance of power cable of hybrid transaxle.
PREPARATION:
(a) Under step 4 condition, disconnect the 3 power cables for MG2 and a power cable for MG1 from the
converter & inverter assembly.
(b) Check that the voltage between each of the 6 terminals of the power cables and body ground is 0 V.
CHECK:
Using a megger (500V), measure the insulating resistance between each of the 6 terminals and the hybrid
transaxle.
OK:
Insulating resistance: 10MW or more
NG Replace the hybrid transaxle assembly.
OK

DI±336
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
2001 PRIUS (RM778U) 4/27/01
8 Is DTC P3009 of battery ECU being output?
(Check for battery cover.)
PREPARATION:
(a) Under step 2 condition, turn the ignition switch OFF and disconnect the negative terminal of the auxilia-
ry battery.
(b) Remove the service plug.
(c) Using the service plug, turn the interlock counterclockwise to unlock.
(d) Remove the 3 nuts and battery carrier catch bracket.
(e) Remove the 2 bolts and power cables.
(f) Remove the battery cover.
(g) Connecting the negative terminal of the auxiliary battery, turn the ignition switch ON and clear the DTC.
HINT:
When the ignition switch is turned ON, DTC P3140 is stored in the HV ECU. This happens because the ser-
vice plug is removed, so continue the operation.
(h) After turning the ignition switch OFF, connect the service plug.
(i) Turn the ignition switch ON (to ST), leave it alone for 1 min. and then check for DTC.
CHECK:
Check that DTC P3009 is detected.
NO Check for contact between battery carrier catch
bracket and power cable and if any defect is
identified, replace defective part.
HINT:
If no defect is identified at inspection, entry of foreign matter or
water into the battery assembly or converter & inverter assem-
bly may be possible as a cause.
YES

± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
DI±337
2001 PRIUS (RM778U)
9 Check insulating resistance of main battery cable.
PREPARATION:
(a) Under step 7 condition, turn the ignition switch OFF and disconnect the negative terminal of the auxilia-
ry battery.
(b) Remove the service plug.
(c) Remove the main battery cables. (Disconnect 4 terminals of a long and a short cables connected be-
tween the system main relay and the HV battery.)
CHECK:
Using a megger (500V), measure the insulating resistance between the main battery cable and body ground.
OK:
Insulating resistance: 10MW or more
NG Replace the main battery cable.
OK
10 Check insulating resistance of system main relay.
CHECK:
Using a megger (500V), measure the insulating resistance between each of 2 connected parts of the system
main relay to the power cables and body ground, and between each of 2 connected parts of the system main
relay to the main battery cables and body ground.
OK:
Insulating resistance: 10MW or more
NG Replace the system main relay.
OK

± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
DI±339
2001 PRIUS (RM778U)
13 Is DTC P3009 of battery ECU being output?
PREPARATION:
(a) Under step 11 condition, disconnect the HV connector from the battery ECU.
(b) Connect the negative terminal of the auxiliary battery (with the service plug removed).
(c) Turn the ignition switch ON (not ST) and clear the DTC.
HINT:
When the ignition switch is turned ON, DTC P3140 is stored in the HV ECU. This happens because the ser-
vice plug is removed, so continue the operation.
CHECK:
Check that DTC P3009 is detected.
YES Replace the HV battery ECU.
NO
14 Check insulating resistance of wire harness for module voltage detection.
PREPARATION:
(a) Under step 12 condition, turn the ignition switch OFF and disconnect the negative terminal of the auxil-
iary battery.
(b) Remove the 36 nuts and the busbar module on the battery rear side.
CHECK:
Using a megger (500V), measure the insulating resistance between the connector terminal of the wire har-
ness for the removed module's voltage detection and body ground.
OK:
Insulating resistance: 10 MW or more
NG Replace the HV battery assembly.
OK
Replace the HV battery ECU.

DI7NG±01
N09348
Hand±held tester
Break±out±box
F12396DLC3
N17520
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±647
2001 PRIUS (RM778U)
PRE±CHECK
1. ECU TERMINAL VALUES MEASUREMENT BY USING
BREAK±OUT±BOX AND HAND±HELD TESTER
(a) Hook up the break±out±box and hand±held tester to the
vehicle.
(b) Read the ECU input/output values by following the
prompts on the tester screen.
(c) Please refer to the hand±held tester has a ºSnapshotº
function. This records the measured data and is effective
in the diagnosis of intermittent problems.
2. USING HAND±HELD TESTER
(a) Hook up the hand±held tester to the DLC3.
(b) Monitor the ECU data by following the prompts on the tes-
ter screen.
HINT:
Hand±held tester has a ºSnapshotº function which records the
monitored data.
Please refer to the hand±held tester operator's manual for fur-
ther details.
3. DTC CLEARANCE
DTC can be deleted using a hand±held tester. If there is no
hand±held tester or it cannot be used, disconnect the auxiliary
battery for 1 min. or more and connect it again.
4. PROBLEM SYMPTOM CONFIRMATION
(ROAD TEST)
(a) Inspect the SET switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Press the control switch to the SET/COAST.
(4) After releasing the switch, check that the vehicle
cruises at the desired speed.

Mode Status
Error DB01 *2
(Communication
Control)Dual sound is detected.
Check harness for power supply
system of component shown by
auxiliary code.

Check harness for communica-
tion system of component shown by
auxiliary code.
Transmission
Error DC 01 *4
(Communication
Control)Transmission to component shown
by auxiliary code has been failed.
(This code does not necessarily
mean actual failure.)If same component shown by auxil-
iary code is recorded in other com-
ponent(s), check harness for power
supply and communication system
of components shown sub code.
Slave Reset
(Momentary
Interruption) DE 01 *5
(Communication
Control)After engine start, slave component
has been disconnected.
DB
Check harness for power supply
system of component shown by
auxiliary code.

Check harness for communica-
tion system of component shown by
auxiliary code.
No response to
connection
checkComponent shown by auxiliary
code is or was disconnected from
system after engine is started.
Component operated (sound and/
or image was provided) before en-
gine stop is or was disconnected
with ignition switch in ACC or ON.
Check harness for power supply
of component shown by auxiliary
code

Check harness for communica-
tion system of component shown
by auxiliary code D8
D9 Last Mode
Error
Check harness for power supply
of component shown by auxiliary
code

Check harness for communica-
tion system of component shown
by auxiliary code 01 *3
(Communication
Control)
01 *2
(Communication
Control)
Multiple Frame
Abort E4 01 *1
(Communication
Control)Since this DTC is provided for engi-
neering, it may be detected when
no actual failure exists. Multiple frame transmission is
aborted. Registered
component
disconnectedComponent shown by auxiliary
code is or was disconnected from
system with ignition switch in ACC
or ON.
Communication with component
shown by auxiliary code is not es-
tablished when engine is started.
Check harness for power supply
of component shown by auxiliary
code

Check harness for communica-
tion system of component shown by
auxiliary code D5 01 *2
(Communication
Control)
No Response
to ON/OFF
Instruction DA 01
(Communication
Control)No response is identified when
changing mode (audio and visual
mode change). Detected when
sound and picture does not change
by button operation.
Check harness for power supply
of component shown by auxiliary
code.

Check harness for communica-
tion system of component shown by
auxiliary code.

If error occurs again, replace
component shown by auxiliary
code.
*2: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
*3: It is stored when 180 sec. has passed after the power supply connector is pulled out after engine start.
*4: It may be stored when the engine key is turned again 1 min. after engine start.
*5: It may be stored when the engine key is turned again after engine start. DI±814
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)

Physical address: 190 Radio receiver assembly
Diagnosis item
ROM Error
Absence of
MasterDiagnosis contentCountermeasure and
inspected parts
Error is detected in internal ROM. Logical address
01
(Communication
Control)
01 *2
(Communication
Control)Component in which this code is re-
corded has been disconnected from
system with ignition in ACC or ON.
Or, when this code was recorded,
multi±display assembly was discon-
nected.
Check harness for power supply
system of multi display.

Check harness for communica-
tion system of multi display.

Check harness for power supply
system of radio receiver assembly.

Check harness for communica-
tion system of radio receiver as-
sembly.
DTC
21
D6Replace radio receiver assembly.
RAM Error Error is detected in internal RAM. 01
(Communication
Control)22Replace radio receiver assembly.
No Response
to Connection
Check 01 *3
(Communication
Control)Component shown by auxiliary code
is or had been disconnected from
system after engine start.
D9
Check harness for power supply
system of component shown by
auxiliary code.

Check harness for communica-
tion system of component shown by
auxiliary code. D8
Last Mode Error 01 *2
(Communication
Control)Component operated (sounds and/
or images were provided) before en-
gine stop is or has been discon-
nected with ignition switch in ACC or
ON.Check harness for power supply
system of component shown by
auxiliary code.
Check harness for communication
system of component shown by
auxiliary code. D9
No Response
to ON/OFF
Instruction
Mode Status
ErrorNo response is identified when
changing mode (audio and visual
mode change). Detected when
sound and picture does not change
by button operation. DA
DB 01
(Communication
Control)
01 *2
(Communication
Control)Dual alarm is detected.
Check harness for power supply
of component shown by auxiliary
code.

Check harness for communica-
tion system of component shown by
auxiliary code.
Check harness for power supply
of component shown by auxiliary
code.

Check harness for communica-
tion system of component shown by
auxiliary code.

If error occurs again, replace
component shown by auxiliary
code.
Transmission
Error DC 01 *4
(Communication
Control)Transmission to component shown
by auxiliary code has been failed.
(Detecting this DTC does not nec-
essary mean actual failure.)

If same auxiliary code is recorded
in other component, check harness
for power supply and communica-
tion system of components shown
sub code.
Master Reset
(Momentary
Interruption) DD 01 *5
(Communication
Control)After engine is started, multi±dis-
play assembly was disconnected
from system.
If this error occurs frequently, re-
place multi±display assembly.
± DIAGNOSTICSNAVIGATION SYSTEM
DI±815
2001 PRIUS (RM778U)

Slave Reset
(Momentary
Interruption) DE 01 *5
(Communication
Control)After engine is started, slave com-
ponent was disconnected from sys-
tem.
Check harness for power supply
of component shown by auxiliary
code.

Check harness for communica-
tion system of component shown by
auxiliary code.
Master Error DF 01 *6
(Communication
Control)Due to defective condition of multi
display, master function is switched
to audio equipment.
Error occurs in communication be-
tween sub±master (audio) and mul-
ti display.
Check harness for power supply
of multi±display assembly.

Check harness for communica-
tion system of multi±display assem-
bly.

Check harness for communica-
tion system between multi±display
assembly and sub±master compo-
nent.
Registration
Completion
Instruction
Error E0 01
(Communication
Control)ºRegistration Completion Instruc-
tionº command from multi display
cannot be received.
Since this DTC is provided for en-
gineering purpose, it may be de-
tected when no actual failure exists.
Audio
processor ON
error E1 01 *2
(Communication
Control)While source equipment is operat-
ing, AMP output is stopped.
Check harness for power supply
of multi±display assembly.

Check harness for communica-
tion system of multi±display assem-
bly.
ON/OFF
Instruction
Parameter
Error E2 01
(Communication
Control)Error occurs in ON/OFF controlling
command from multi±display as-
sembly.
Replace multi±display assembly.
Registration
Request
Transmission E3 01
(Communication
Control)Registration Request command is
output from slave component.
Receiving Connection Check
Instruction, Registration Request
command is output from sub±mas-
ter component.
Since this DTC is provided for en-
gineering purpose, it may be de-
tected when no actual failure exists.
Plural Frame
Abort E4 01
(Communication
Control)
Since this DTC is provided for en-
gineering purpose, it may be de-
tected when no actual failure exists. Plural frame transmission is
aborted.
AM Tuner Error 43 60
(Radio receiver
assembly)Replace radio receiver assembly. Abnormal condition is detected in
AM tuner.
Inspect radio receiver assembly.
FM Tuner Error 44 60
(Radio receiver
assembly)Replace radio receiver assembly.
Abnormal condition is detected in
FM tuner.
Mechanical or
Media Error 40 61
(Cassette
switch)Inspect cassette tape.
Malfunction due to mechanical fail-
ure is identified. Or, cassette tape is
cut or entangled.
EJECT
Malfunction 41 61
(Cassette
switch)Malfunction due to mechanical fail-
ure.Replace radio receiver assembly.
No Disc
Readout 42 62
(CD player)Disc cannot be read.Inspect CD.
CD Error 44 62
(CD player)Error is detected in CD player.Replace radio receiver assembly. DI±816
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)