2001 TOYOTA PRIUS coolant

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±193
2001 PRIUS (RM778U)
5. CHECK FOR INTERMITTENT PROBLEMS
(a) Perform a simulation test (See page IN±41).
In the simulation test, reproduce the driving condition at the trouble occurrence according to the cus-
tomer 's comments and freeze frame data recorded with DTC, such as an opening angle of the acceler-
ator pedal, SOC, engine coolant temperature, engine rpm, and MG/1MG2 rpm and torque.
(b) Check the connector and terminal (See page IN±41).
(c) Handle the connector (See page IN±41).
6. TOYOTA HAND±HELD TESTER DISPLAY ITEMS
TOYOTA Hand±held tester displayMeasurement Item
1 BEF LATST ORNumber of operation of 1 trip before last
1 BEF LATST TRPNumber of trips before last
2 BEF LATST ORNumber of operation 2 trips before last
2 BEF LATST TRPNumber of trips 2 before last
ABNML CON BR±HVCommunication malfunction between HV ECU and brake
ACC SENSOR MAINMain accelerator sensor
ACC SENSOR SUBSub accelerator sensor
ACC TENT TRBLETentative trouble of accelerator
ACC THROTTLEAccelerator throttle
ACCEL MODEHistory of acceleration and reduction
AIR CON REQUESTAir conditioner request
AUX. BATT LOWAuxiliary battery becomes week
AUX. BATT VVoltage of auxiliary battery
BATT HIGH TEMPTemperature of the battery is too high
BATT HIGH VOLTVoltage of the battery is too high
BATT LOW BOLTVoltage of the battery is low
BATT OVER LOADBattery is overloaded
BATT SAVE RQSTRequest to save the main battery
BATTERY FULLBattery full
BRAKE TORQBrake torque
CELL TEMP±MAXHighest temperature of all battery cells
CELL TEMP±MINLowest temperature of all battery cells
CHG RESTRICTIONCharge restriction
COOLANT TEMPWater temperature
CRUISE CONTROLCondition of the cruise control
DC/DC CONV STOPDC/DC converter stop signal
DC/DC CONV STOPFactors causing DC/DC converter to stop
DC/DC STOP FACTDC/DC converter has stopped at least once
DC/DC V UNSETDC/DC voltage is unsettled
DCHG RQST SOCDischarge request to adjust SOC
DISCHAG INHIBITBattery is inhibited to discharge

DI7S2±01
DI±874
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
DIAGNOSTIC TROUBLE CODE CHART
DTC No.
(See Page)Detection ItemTrouble Area
11*1
(DI±876)Room temp. sensor circuit

Room temp. sensor

Harness or connector between room temp. sensor and A/C
amplifier

A/C amplifier
12*2
(DI±879)Ambient temp. sensor circuit

Ambient temp. sensor

Harness and connector between ambient temp. sensor and
ECM

ECM

Harness and connector between ECM and A/C amplifier

A/C amplifier
13
(DI±882)Evaporator temp. sensor circuit

Evaporator temp. sensor

Harness and connector between evaporator temp. sensor
and A/C amplifier

A/C amplifier
14
(DI±885)Engine coolant temp. sensor circuit

Water temp. sensor

Harness and connector between engine coolant temp. sensor
and ECM

ECM

Harness and connector between ECM and A/C amplifier
21*3
(DI±888)Solar sensor circuit

Solar sensor

Harness or connector between room temp. sensor and A/C
amplifier

A/C amplifier
22*4
(DI±891)
All conditions below are detected for 3 sec. or more
(g) Engine speed: 500 rpm or more
(h) Ratio between engine and compressor rpm deviates 20 %
or more in comparison to normal operation
Compressor drive belt

Compressor lock sensor

Compressor

Harness and connector between compressor lock sensor and
A/C amplifier
23
(DI±894)
Open in pressure switch circuit
Abnormal refrigerant pressure
[below 196 kPa (2.0 kgf/cm
2, 28 psi) over
3,140 kPa (32.0 kgf/cm2, 455 psi)]

Pressure switch

Harness or connector between pressure switch and A/C am-
plifier

A/C amplifier
31
(DI±897)Air mix damper position sensor circuit

Air mix control servomotor

Harness or connector between air mix control servomotor
and A/C amplifier

A/C amplifier
32
(DI±900)Air inlet damper position sensor circuit

Air inlet control servomotor

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

A/C amplifier
33
(DI±903)Air outlet damper position sensor circuit

Air outlet control servomotor

Harness or connector between air outlet control servomotor
and A/C amplifier

A/C amplifier
41
(DI±906)Air mix control servomotor circuit

Air mix control servomotor

Air mix damper position sensor

Harness or connector between air mix control servomotor
and A/C amplifier

A/C amplifier

I18376
ECM
E9 THW14
E2 18 E2
Engine Coolant Temp. SensorW
B±RE9 2
1 DI±890
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
DTC 14 Engine Coolant Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the engine coolant temperature and sends the appropriate signals to the A/C amplifier.
These signals are used for warm up control when the engine is cold.
DTC No.Detection ItemTrouble Area
14Ohtittt iit

Water temperature sensor

Harness or connector between engine coolant temp. sensor
d ECM14Open or short in water temperature sensor circuit.and ECM

Harness or connector between ECM and A/C amplifier

A/C amplifier
WIRING DIAGRAM
DI7S8±01

S05502
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±891
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check engine coolant temp. sensor using hand±held tester.
PREPARATION:
Connect the hand±held tester to the DLC3.
CHECK:
Check the engine coolant temp. sensor using DATA LIST.
OK Check or replace A/C amplifier.
NG
2 Check engine coolant temp. sensor.
PREPARATION:
Remove engine coolant temp. sensor.
CHECK:
Measure resistance between terminals.
OK:
Resistance is within acceptable zone on chart.
Water temperatureResistance
20°C (68°F)2 ± 3 kW
80°C (176°F)0.2 ± 0.4 kW
NG Replace engine coolant temp. sensor.
OK

DI±892
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
3 Check for open and short in harness and connector between ECM and engine
coolant temp. sensor (See page IN±41).
NG Repair or replace harness or connector.
OK
Check multiplex communication system (See page DI±750).

DI±956
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
6 Check engine coolant temp. switch (See page AC±84).
NG Replace water temp. switch.
OK
7 Check harness and connector between A/C amplifier and pressure switch, pres-
sure switch and body ground (See page IN±41).
NG Repair and replace harness and connector.
OK
8 Check harness and connector between A/C amplifier and water temp. switch, wa-
ter temp. switch and body ground (See page IN±41).
NG Repair and replace harness and connector.
OK
Check and replace A/C amplifier.

EM173±04
A13942
Hood to Cowl Top
seal
VSV for EVAPR/B (ABS) Air Cleaner
Assembly
RH Engine Mounting
Insulator Engine Coolant
Reservoir Tank
Engine Under
Cover RH
N´m (kgf´cm, ft´lbf) : Specified torqueOuter Front Cowl
Top Panel Air Inlet
60 (612, 44)
52 (530, 38)
52 (530, 38)
26 (265, 19)Brake Reservoir
Tank
Wiper Motor and
Wiper Link
Assembly
Cowl Top Ventilator
Lower LH
Cowl Top Ventilator
Lower RH
Wiper Arm
7 (71, 62 in. lbf)
26 (265, 19)
± ENGINE MECHANICALTIMING CHAIN
EM±13
1129 Author: Date:
2001 PRIUS (RM778U)
TIMING CHAIN
COMPONENTS

EM1IU±03
A13907
A13908
A13934
A13943
± ENGINE MECHANICALTIMING CHAIN
EM±15
2001 PRIUS (RM778U)
REMOVAL
1. DISCONNECT BATTERY NEGATIVE (±) TERMINAL
AND HV BATTERY SERVICE PLUG
(See page HV±1)
2. REMOVE OUTER FR COWL TOP PANEL ASSEMBLY
(See page BO±32)
3. REMOVE RH ENGINE UNDER COVER
4. DRAIN ENGINE COOLANT
5. REMOVE AIR CLEANER ASSEMBLY
(a) Disconnect the MAF meter connector.
(b) Disconnect the EVAP hose from the air cleaner case.
(c) Loosen the 2 hose clamps.
(d) Remove the 3 bolts and air cleaner assembly.
6. REMOVE BRAKE RESERVOIR TANK
(a) Disconnect the brake fluid level sensor connector.
(b) Remove the 2 bolts and remove the reservoir tank and
suspend it.
(c) Remove the 3 bolts and reservoir tank bracket.
7. DISCONNECT CONNECTORS
(a) Disconnect the 4 ignition connectors.
(b) Disconnect the 4 injector connectors.
(c) Disconnect the 2 VSV connectors.
(d) Disconnect the camshaft position sensor connector.
(e) Disconnect the water temperature connector.
(f) Disconnect the Camshaft timing oil control valve connec-
tor.
8. REMOVE AIR INLET
9. REMOVE ENGINE COOLANT RESERVOIR TANK
10. REMOVE VSV FROM ENGINE MOUNTING INSULA-
TOR
11. REMOVE DRIVE BELT