2001 TOYOTA PRIUS O2 sensor

4
1
0
100%Damper opening angle4.1 V
0.9 V
TPI terminal voltage (V)
I14169
A/C Control Assembly A14
Air Inlet Control
Servomotor
A9
S5TPI 19
SGTPI A9
2 118
18TPI
A9 W
3
W
W
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±905
2001 PRIUS (RM778U)
DTC 32, 42 Air Inlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air inlet damper and
sends the appropriate signals to the A/C amplifier. The position
sensor is built into the air inlet control servomotor.
DTC No.Detection ItemTrouble Area
32Short to ground or power source circuit in air inlet damper posi-
Air inlet damperposition sensor32Short to ground or ower source circuit in air inlet dam er osi
tion sensor circuit.

Air inlet damper position sensor

Harness or connector between air inlet control servomotor
42Air inlet damper position sensor value does not change even if
A/C amplifier operates air inlet control servomotor.
Harness or connector between air inlet control servomotor
and A/C amplifier

A/C amplifier
WIRING DIAGRAM
DI7SD±01

I1907732 1
REC
FRS
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±907
2001 PRIUS (RM778U)
2 Check air inlet damper position sensor.
PREPARATION:
Remove air inlet control servomotor (See page AC±33).
CHECK:
Measure resistance between terminals 1 and 2 of air inlet con-
trol servomotor connector.
OK:
Resistance : 4.2 ± 7.8 kW
CHECK:
While operating air inlet control servomotor as in the procedure
on page DI±909, measure resistance between terminals 2 and
3 of air inlet control servomotor connector.
OK:
Resistance :
Damper PositionResistance
REC side3.4 ± 6.2 kW
FRS side0.8 ± 1.6 kW
HINT:
As the air inlet control servomotor is moved from REC side to
FRS side, the resistance decreases gradually without interrup-
tion.
NG Replace air inlet control servomotor.
OK
3 Check harness and connector between A/C amplifier and air inlet control servo-
motor (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace A/C amplifier.

TPM terminal voltage
(V)
4.3
0.7
0 100 %
Damper opening angle
I18402
A/C Amplifier A16
Air Outlet Control Servomotor
A9S5TPM
8SGTPM A9
31
9 7
TPM A9 W 5
II1
3
II1
4
II1W
W W
BR±W2
GR±L DI±908
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
DTC 33, 43 Air Outlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air outlet damper and
sends the appropriate signals to the A/C amplifier.
The position sensor is built into the air outlet damper control ser-
vomotor assembly.
DTC No.Detection ItemTrouble Area
33Short to ground or power source circuit in air outlet damper
position sensor circuit.
Air outlet damper position sensor.

Harness or connector between air outlet damper control ser-
43Air outlet damper position sensor value does not change even
if A/C amplifier operates air outlet damper control servomotor.

Harness or connector between air outlet dam er control ser-
vomotor assembly and A/C amplifier.

A/C amplifier.
WIRING DIAGRAM
DI7SE±01

I19078
DEF
FACE
1
2
3
DI±910
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
2 Check air outlet damper position sensor.
PREPARATION:
Remove air outlet servomotor (See page AC±57).
CHECK:
Measure resistance between terminals 1 and 2 of air outlet ser-
vomotor assembly connector.
OK:
Resistance : 4.2 ± 7.8 kW
CHECK:
While operating air outlet damper control servomotor as in the
procedure on page DI±912, measure resistance between ter-
minals 2 and 3 of air outlet damper control servomotor.
OK:
Resistance:
Damper PositionResistance
DEF3.6 ± 6.7 kW
FACE0.6 ± 1.1 kW
HINT:
As the air outlet servomotor moves from DEF side to FACE side,
the resistance decreases gradually without interruption.
NG Replace air outlet control servomotor assem-
bly.
OK
3 Check harness and connector between A/C amplifier and air outlet control servo-
motor assembly (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace A/C amplifier.

I18391
A/C Amplifier
AMC A914
W II19
AMH A913
IG A71
GND A77 L
F18
FL Block No. 2
BatteryA15
Air Mix Control
Servomotor
Instrument Panel J/B
I15
Ignition
SW 4
BR±R
J20
J/C
C 5
W II1 10
C
R R 2D3
2H1
2D6
2K8
2B3
8
2D HTR
IG1 Relay
AM1B±Y
J/C 35
214
W±GIG1
AM1
2 W
W±B J25A
J24A
W±B
A
J11
J/C
ID MAINFL Block No. 1
F111
F131
1
DC/DC
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±911
2001 PRIUS (RM778U)
DTC 41 Air Mix Control Servomotor Circuit
CIRCUIT DESCRIPTION
This air mix control servomotor is controlled by the A/C amplifier and moves the air mix damper to the desired
position.
DTC No.Detection ItemTrouble Area

Air mix control servomotor.
41Air mix damper position sensor value does not change even if
Air mix control servomotor.

Air mix damper position sensor.
H t b t A/C lifi d i i41Air mix dam er osition sensor value does not change even if
A/C amplifier operates air mix control servomotor.
Harness or connector between A/C amplifier and air mix con-
trol servomotor, air mix damperposition sensor.trol servomotor, air mix damper position sensor.

A/C amplifier.
WIRING DIAGRAM
DI7SF±01

I18403
A/C Amplifier
AIF A922
W
AIR A921
IG A71
GND A77
F18
FL Block No. 2
BatteryA15
Air Inlet Control
Servomotor
Instrument Panel J/B
I15
Ignition
SW 4
J20
J/C
C 5W
C
R R 2D3
2H1
2D6
2K8
2B3
8
2D HTR
IG1 Relay
AM1B±Y
J/C 35
214
W±GIG1
AM1
2 W
W±B J23A
J22A
W±B
A
J11
J/C
ID MAINFL Block No. 1
F111
F131
1DC/DC
B±G DI±914
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
DTC 42 Air Inlet Control Servomotor Circuit
CIRCUIT DESCRIPTION
The air inlet control servomotor is controlled by the A/C amplifier and moves the air inlet damper to the de-
sired position.
DTC No.Detection ItemTrouble Area

Air inlet damper position sensor
42Air inlet damper position sensor value does not change even if
A/C amplifier operates air inlet control servomotor

Harness or connector between air inlet control servomotor
and A/C amplifierA/C amplifier operates air inlet control servomotor.and A/C amplifier

A/C amplifier
WIRING DIAGRAM
DI7SG±01

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±917
2001 PRIUS (RM778U)
DTC 43 Air Outlet Damper Control Servomotor Cir-
cuit
CIRCUIT DESCRIPTION
This circuit turns the servomotor and changes each mode damper position by the signals from the A/C ampli-
fier. When the AUTO switch is on, the A/C amplifier changes the mode automatically between (FACE), (BI±
LEVEL) and (FOOT) according to the temperature setting.
DTC No.Detection ItemTrouble Area

Air outlet damper control servomotor.
43Air outlet damper position sensor value does not change even
Air outlet dam er control servomotor.

Air outlet damper position sensor.
H t bt A/C lifi i tltd43Air outlet dam er osition sensor value does not change even
if A/C amplifier operated air outlet damper control servomotor.
Harness or connector between A/C amplifier air outlet damper
control servomotor, air outlet damperposition sensor.control servomotor, air outlet damper position sensor.

A/C amplifier.
DI7SH±01

EM±2
± ENGINE MECHANICALCO/HC
111 8 Author: Date:
2001 PRIUS (RM778U)
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.

Check heated oxygen sensor operation.
(See page DI±44)

See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
COHCProblemsCauses
NormalHighRough idle1. Faulty ignitions:

Incorrect timing

Fouled, shorted or improperly gapped plugs

Open or crossed high±tension cords
2. Incorrect valve clearance
3. Leaky intake and exhaust valves
4. Leaky cylinders
LowHighRough idle
(Fluctuating HC reading)1. Vacuum leaks:

PCV hoses

Intake manifold

Throttle body
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter
2. Plugged PCV valve
3. Faulty EFI systems:

Faulty pressure regulator

Defective water temperature sensor

Defective air flow meter

Faulty ECM

Faulty injectors

Faulty throttle position sensor
NormalHigh1. Faulty HCAC:

Faulty VSV

Faulty actuator