2001 TOYOTA HIGHLANDER Service Repair Manual

alarm towing change time clock transmission fluid spare tire

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TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-201
391 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
6. Second reference pressure measurement
Next sequence is run if all of following conditions metCo

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TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (3MZ-FE)
05-563
753 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0442 EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (SMALL LEAK)
DTC P0455 EVAPORATIVE EMI

- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
05-563
753 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0442 EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (SMALL LEAK)
DTC P0455 EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (GROSS LEAK)
DTC P0456 EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (VERY SMALL
LEAK)
CIRCUIT DESCRIPTION
The circuit description can be found in the EVAP INSPECTION PROCEDURE (see page 05-679).
INSPECTION PROCEDURE
Refer to the EVAP INSPECTION PROCEDURE (see page 05-679).
MONITOR DESCRIPTION
The ECM tests the Evaporative Emissions (EVAP) system using the fuel tank pressure sensor, Canister
Close Valve (CCV), and EVAP VSV. The ECM closes the EVAP system and creates negative pressure (vacu-
um) into it. The ECM then monitors the internal pressure using the fuel tank pressure sensor (refer to the
Leak Check graphic).
P0442, P0455 and P0456
A leak in the evaporative emission system prompts the ECM to set DTC P0442, P0455 or P0456.
The ECM checks if the EVAP has leaks. First, the ECM opens the EVAP VSV while the CCV is closed. After
a sufficient amount of time has passed, a high negative pressure(vacuum) will develop in the fuel tank as
air is drawn into the intake manifold. The EVAP VSV is then closed. The ECM then monitors the pressure
increase (loss of vacuum) in the fuel tank. If the pressure rises beyond a specified amount, the ECM deter-
mines that the system has a leak, turns on the MIL and outputs a DTC.
The ECM has separate DTCs for small and large leaks:
(1) DTC P0442 is set when the internal fuel tank pressure has a large increase and the EVAP system
has a small leak.
(2) DTC P0455 is set when the EVAP system has a very large leak. The ECM tries to create negative
pressure (vacuum) in the fuel tank by opening the EVAP VSV while the CCV is closed. However,
the fuel tank pressure does not decrease beyond a specified threshold.
(3) DTC P0456 is set when the internal fuel tank pressure increases slightly and the EVAP system
has a very small leak.
05MOQ-01

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-564
- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
754 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
P0442
P0455
P0456
Cold engine start.
EVAP VSV has bee

Page 1772 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A76973
ECM
Fuel Tank
Charcoal
Canister EVAP VSV
Vapor Pressure
Sensor
CCV EVAP Service
PortIntake Air
Throttle
Valve
Fuel Tank Cap
Air Cleaner Case
Charcoal Canister Filter Charcoal Filter
Intake

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TOYOTA HIGHLANDER 2001 Service Repair Manual A85438
OpenOpen
Open
Close
Close CCV EVAP VSV
Normal Condition or
EVAP System Leak
(Normal Pressure Line)
EVAP VSV
Close Malfunction
(P0441)
EVAP VSV
Open Malfunction
(P0441)
CCV Open
Malfunction
(P

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TOYOTA HIGHLANDER 2001 Service Repair Manual A85439
CCV
(Operation) EVAP VSV
(Operation)
Creation of
Partial
VacuumTank & Canister
Leak Check
(DTC Detection Period) Open
*1
Closed
Open
*2Open Closed
Closed
P0442, P0456 FTP:
Pressure in
Fuel T

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-568
- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
758 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCs
P0442: EVAP 0.04 inch leak
P0455: EVAP gross leak
P0456: EVAP 0.02 i

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TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (3MZ-FE)
05-569
759 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
EVAP 0.04 inch leak P0442:
Both of the following conditions are met

- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
05-569
759 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
EVAP 0.04 inch leak P0442:
Both of the following conditions are met:Condition 1 and 2
1. FTP change for 5 seconds from -20 mmHg (-2.67 kPa)1.3 mmHg (0.17 kPa) or more
2. FTP change for 5 seconds from -17 mmHg (-2.27 kPa)1.3 mmHg (0.17 kPa) or more
EVAP 0.02 inch leak P0456:
Both of the following conditions are met:Condition 1 and 2
1. FTP change for 5 seconds when FTP is -17 mmHg
(-2.27 kPa)0.7 mmHg (0.09 kPa) or more
2. FTP change for 5 seconds when FTP is -20 mmHg
(-2.67 kPa)0.7 mmHg (0.09 kPa) or more
EVAP gross leak P0455:
FTP when vacuum introduction compleated1.3 mmHg (0.17 kPa) or more
MONITOR RESULT
Refer to page 05-385 for detailed information.
The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (see page 05-387).
TID (Test Identification Data) is assigned to each emissions-related component.
TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
CID (Component Identification Data) is assigned to each test value.
Unit Conversion is used to calculate the test value indicated on generic OBD ll scan tools.
TID $02: EVAP system - LEV ll Vacuum monitor
TLTCIDUnit ConversionDescription of Test DataDescription of Test Limit
1$01Multiply by 0.183
(mmHg)Test value of EVAP VSV stuck close:
Determined by fuel tank pressure change
during vacuum introductionMalfunction criteria for EVAP VSV stuck
closed
0$02Multiply by 0.0655
(seconds)Test value of EVAP VSV stuck open:
Determined by duration that fuel tank pres-
sure is higher than criteriaMalfunction criteria for EVAP VSV stuck
open
0$03Multiply by 0.0655
(seconds)Test value of canister closed valve (CCV):
Determined by duration that fuel tank pres-
sure is lower than criteriaMalfunction criteria for Canister Closed
Valve (CCV)
0$04Multiply by 0.0458
(mmHg)Test value 0.04 inch leak:
Determined by fuel tank pressure changeMalfunction criteria for 0.04 inch leak
0$05Multiply by 0.0458
(mmHg)Test value 0.02 inch leak:
Determined by fuel tank pressure changeMalfunction criteria for 0.02 inch leak

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