2001 TOYOTA HIGHLANDER Service Repair Manual

hood open manual transmission climate settings battery location drain bolt warning lights

Page 1417 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A97610
EVAP Purge Flow:
Canister Purge VSV
(ON)
Vacuum Pump (OFF)Air Filter Fuel Tank fuel tank cap
To Intake Manifold
Pump Module
Pressure Sensor0.02 Inch Orifice
Vent Valve (OFF)
ECM
Soak Timer
Refu

A97610
EVAP Purge Flow:
Canister Purge VSV
(ON)
Vacuum Pump (OFF)Air Filter Fuel Tank fuel tank cap
To Intake Manifold
Pump Module
Pressure Sensor0.02 Inch Orifice
Vent Valve (OFF)
ECM
Soak Timer
Refueling Valve
To Atmosphere
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-319
509 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Key-off monitor
This monitor checks for EVAP (Evaporative Emission) system leaks and pump module malfunctions. The
monitor starts 5 hours*
after the ignition switch is turned OFF. More than 5 hours are required to allow enough
time for the fuel to cool down to stabilize the Fuel Tank Pressure (FTP), thus making the EVAP system moni-
tor more accurate.
The electric vacuum pump creates negative pressure (vacuum) in the EVAP system and the pressure is
measured. Finally, the ECM monitors for leaks from the EVAP system, and malfunctions in both the pump
module and purge VSV, based on the EVAP pressure.
HINT:
*:If the engine coolant temperature is not below 35C 5 hours after the ignition switch is turned off, the moni-
tor check starts 2 hours later. If it is still not below 35C 7 hours after the ignition switch is turned off, the
monitor check starts 2.5 hours later.
Purge flow monitor
The purge flow monitor consists of the two monitors. The 1st monitor is always conducted every time and
the 2nd monitor is activated if necessary.
The 1st monitor
While the engine is running and the purge VSV (Vacuum Switching Valve) is ON (open), the ECM
monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not
created, the ECM begins the 2nd monitor.
The 2nd monitor
The vent valve is turned ON (closed) and the EVAP pressure is then measured. If the variation
in the pressure is less than 0.5 kpa (3.75 mmHg), the ECM interprets this as the purge VSV being
stuck closed, and illuminates the MIL and sets DTC P0441 (2 trip detection logic).
Atmospheric pressure check:
In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before
and after conduction of the purge flow monitor, is measured by the ECM.

Page 1418 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-320
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
510 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)Components
Operations
CanisterContains activated charcoal to absorb EVAP (Evaporative Emissions) ge

05-320
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
510 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)Components
Operations
CanisterContains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.
Cut-of f valveLocated in fuel tank. Valve floats and closes when fuel tank is 100 % full.
Purge VSV (Vacuum
Switching Valve)Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order
to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake
manifold controlled by purge VSV duty cycle ratio (current-carrying time). (Open: ON, Close: OFF)
Refueling valve
Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and restrictor (diameter: 0.08
inch). When fuel vapor and pressure inside fuel tank increase, valve opens. While EVAP purged, valve closes and re-
strictor prevents large amount of vacuum from affecting pressure in fuel tank. Valve opened while refueling. When valve
open, adding fuel into fuel tank possible.
Roll-over valveLocated in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out.
Service portUsed for connecting vacuum gauge for inspecting EVAP system.
Soak timerBuilt into ECM. To ensure accurate EVAP monitor, measures 5 hours* after ignition switch turned to OFF. This allows
fuel to cool down, stabilizing Fuel Tank Pressure (FTP). When apprx. 5 hours
* elapsed, ECM activates.
Pump moduleConsists of (a) to (d) below. Pump module cannot be disassembled.
(a) Vent valve
Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF, EVAP
system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing purge VSV,
turning on vent valve (closed) and operating vacuum pump (refer to fig. 1).
(b) Pressure sensorIndicates pressure as voltages. ECM supplies regulated 5 V to pressure sensor, and uses feedback from sensor to
monitor EVAP system pressure (refer to fig 2).
(c) Vacuum pumpCreates negative pressure (vacuum) in EVAP system for leak check.
(d) 0.02 inch orificeHas opening with 0.02 inch diameter. Vacuum produced through orifice by closing purge VSV, turning off vent valve and
operating vacuum pump, to monitor 0.02 inch leak pressure. 0.02 inch leak pressure indicates small leak of EVAP.
HINT:
*:If the engine coolant temperature is not below 35C after 5 hours after the ignition switch is turned off, the
monitor check starts 2 hours later. If it is still not below 35C 7 hours after the ignition switch is turned off,
the monitor check starts 2.5 hours later.

Page 1419 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A97611
Pump Module (fig. 1)
Condition: Purge FlowCondition: Leak Check
From Refueling Valve
To Air Filter
(Atmosphere)
Vacuum Pump: OFFVent Valve: OFF
(vent)
Pressure Sensor 0.02 Inch Orifice
Canister

Page 1420 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A85256
C17
Pump Module
BJ1 IO1 IM1E7
E5
E7
E5
E5
E7
E5 18
21
28
4
27
34
8VC
PPMP
E2
MPMP
VPMP
PRG
MRELECM
5V
Pressure Sensor
BJ1 IO1 IM1
BJ1 IO1 IM1
BJ1 IO1 IM1 BJ1 IO1 BJ1 IO1
EB1 16 7 13
12 3
17 15

Page 1421 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 0.02 inch orifice clogged
Pressure sensor low outputP043E
P043FP0441 P0451 P0452 P0453 P0455 P0456 P2419P2401
P2402
0.02 inch orifice high-flow
Pressure sensor stuck
Pressure sensor noise
Gross leak
S

Page 1422 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-324
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
514 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 PERFORM EVAP SYSTEM CHECK(AUTO OPERATION)
NOTICE:
In the EVAP SYSTEM CHECK (AUTO OPERATION), th

Page 1423 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual G36782
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak PressureON: Open
NegativeONON
Steps
(Reference)60 Within 15 minutes 10 60ON
First 0.02 inch
2/5 3/5 4/55/5
OFF: Closed
OFF: Vent ON:

Page 1424 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual G36783
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
NegativeONON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent ON: Closed
10
sec
1/5
Time
Pressure Sensor Noising
OK
Leak Pressure Firs

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