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DI-368
DIAGNOSTICS - ENGINE (1GR-FE)
DIDUC-01
EVAP (Evaporative Emission) Inspection Procedure
DTCS RELATING TO EVAP SYSTEM
DTCs Monitoring Items See Page
P043E 0.02 inch orifice clogged (built into pump module) DI-353
P043F 0.02 inch orifice high-flow (built into pump module) DI-353
S Purge VSV (Vacuum Switching Valve) stuck closed
P0441 S Purge VSV stuck open DI-236
S Purge flow
P0450 Pressure sensor (built into pump module) voltage abnormal fluctuation DI-243
S Pressure sensor (built into pump module) noise
P0451 DI-243
S Pressure sensor (built into pump module) signal becomes fixed/flat
P0452 Pressure sensor (built into pump module) voltage low DI-243
P0453 Pressure sensor (built into pump module) voltage high DI-243
P0455 EVAP gross leak DI-252
P0456 EVAP small leak DI-252
P2401 Vacuum pump stuck OFF (built into pump module) DI-339
P2402 Vacuum pump stuck ON (built into pump module) DI-339
P2419 Vent valve stuck open (vent) (built into pump module) DI-345
P2420 Vent valve stuck closed (built into pump module) DI-345
P2610 Soak timer (built into ECM) DI-351
If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below.
DTCs P043E P2401
P0441 P0450 P0451 P0452 P0453 P0455 P0456 P2419 P2420
Malfunctioning Areas P043F P2402
0.02 inch orifice clogged
0.02 inch orifice high-flow
Purge VSV stuck open
Purge VSV stuck closed
Pressure sensor stuck
Pressure sensor noise
Pressure sensor low output
Pressure sensor high output
Gross leak
Small leak
Vacuum pump stuck OFF
Vacuum pump stuck ON
Vent valve stuck open (vent)
Vent valve stuck closed
NOTICE:
If the 0.02 inch reference pressure difference between the first and second checks is greater than
the specification, the DTCs corresponding to the reference pressure (P043E, P043F, P0441, P0455,
P0456, P2401, P2420) will be all stored.
DI-369
DIAGNOSTICS - ENGINE (1GR-FE)
CIRCUIT DESCRIPTION
Location of EVAP (Evaporative Emission) system: Pump Module
Refueling Valve
Purge VSV Pressure Sensor
(Vacuum Switching Valve) Vacuum Pump
Canister
Vent Valve
EVAP Hose
(From Canister) Air Filter
Fuel Tank
Air Inlet Port
Purge Line Breeding
EVAP Hose
Pipe Fuel Tank Cap
(To Throttle Body) cmc0686
HINT:
The canister is located near the fuel tank, underneath the body.
EVAP System Circuit:
Air Cleaner
Throttle Valve
ECM
Soak Timer
Intake Manifold
Pump Module
Fuel tank cap
Air Filter
Purge VSV Canister
Refueling Valve
Restrictor (0.08 inch)
Roll-Over Valve
Cut-Off Valve
Fuel Tank
cmc0119
While the engine is running, if a predetermined condition (closed-loop, etc.) is met, the purge VSV is opened
by the ECM and stored fuel vapors in the canister are purged to the intake manifold. The ECM changes the
duty cycle ratio of the purge VSV to control purge flow volume.
The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is allowed
into the canister through the vent valve to ensure that the purge flow is maintained when the negative pres-
sure (vacuum) is applied to the canister.
The following two monitors run to confirm appropriate EVAP system operation.
DI-370
DIAGNOSTICS - ENGINE (1GR-FE)
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 35_C 5 hours after the ignition switch is turned off, the moni-
tor check starts 2 hours later. If it is still not below 35_C 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.
S 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.
S 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.
EVAP Purge Flow:
Fuel tank cap
Refueling Valve
To Atmosphere
Purge VSV Fuel Tank 0.02 Inch Orifice
(ON)
Canister
Pressure Sensor
To Intake Manifold
Air Filter
Vent Valve (OFF)
ECM Vacuum Pump (OFF)
Pump Module
Soak Timer
cmc0120
DI-371
DIAGNOSTICS - ENGINE (1GR-FE)
Components Operations
Canister Contains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.
Cut-off valve Located in fuel tank. Valve floats and closes when fuel tank is 100 % full.
Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order
Purge VSV (Vacuum
to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake
Switching Valve)
manifold controlled by purge VSV duty cycle ratio (current-carrying time). (Open: ON, Close: OFF)
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-
Refueling valve
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 valve Located in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out.
Service port Used for connecting vacuum gauge for inspecting EVAP system.
Built into ECM. To ensure accurate EVAP monitor, measures 5 hours* after ignition switch turned to OFF. This allows
Soak timer
fuel to cool down, stabilizing Fuel Tank Pressure (FTP). When approx. 5 hours* elapsed, ECM activates.
Pump module Consists of (a) to (d) below. Pump module cannot be disassembled.
Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF, EVAP
(a) Vent valve 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).
Indicates pressure as voltages. ECM supplies regulated 5 V to pressure sensor, and uses feedback from sensor to
(b) Pressure sensor
monitor EVAP system pressure (refer to fig 2).
(c) Vacuum pump Creates negative pressure (vacuum) in EVAP system for leak check.
Has opening with 0.02 inch diameter. Vacuum produced through orifice by closing purge VSV, turning off vent valve and
(d) 0.02 inch orifice
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 35_C after 5 hours after the ignition switch is turned off, the
monitor check starts 2 hours later. If it is still not below 35_C 7 hours after the ignition switch is turned off,
the monitor check starts 2.5 hours later.
DI-372
DIAGNOSTICS - ENGINE (1GR-FE)
Pump Module (fig. 1): : Airflow
Condition: Purge Flow Condition: Leak Check
Vent Valve: OFF Vent Valve: ON
(vent) (closed)
To Air Filter
(Atmosphere)
Canister
0.02 Inch Orifice
Pressure Sensor From Refueling Valve
Vacuum Pump: OFF Vacuum Pump: ON
A23494
Pressure Sensor Specification (fig. 2) Soak Timer Circuit (fig. 3)
Malfunction Area Ignition Switch ECM
Output Voltage IGSW
4.900 V
+B Power
EFI MAIN Source IC
4.150 V 15 A
Usable Range MREL Main Relay
Control IC
1.425 V Battery
Malfunction Area
Soak Timer IC
0.450 V
60 kPa 110 kPa Pressure
(450 mmHg) (825 mmHg)
HINT:
Standard atmospheric pressure is
101.3 kPa (760 mmHg) A23495 A23496
DI-373
DIAGNOSTICS - ENGINE (1GR-FE)
WIRING DIAGRAM
ECM
J/C
9 26 8
GR-G GR-G
J26 J27 E3 MREL
V4
J1 Engine Room R/B J8 VSV
J/C EFI No. 2 J/C J/C 22 (EVAP)
7 24 34
W-L R
2 2 J26 J27 R R IE1 R G-W E7 PRG
B A A 1 2
1 2
B A
W-L R
9
2 2 BB3
3 1
Engine
EFI R
Relay Room
L4
R/B
Leak Detection Pump Assy
5 2
7 22
2 2 9 L-W L-W
BB3 E3 PPMP
3
B-R 5 5
L-B L-B
BB3 E3 VPMP
2 8
2 10 6
Engine Room R/B
R-W R-W
BB3 E3 MPMP
2 4 1
EFI
No. 1 6
W-B
1 W-B
8 18 23
2 4 BB4 G-B G-B G-B
BB3 IE1 E7 VC
A W-B 6 24 28
B-W B-W B-W
J18 BB3 IE1 E7 E2
B J/C
19 IE1
A
W-B W-B
Battery
EA EU
A23579
DI-374
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
NOTICE:
A hand-held tester is required to conduct the following diagnostic troubleshooting procedure.
HINT:
S Using hand-held tester monitor results enables the EVAP (Evaporative Emission) system to be con-
firmed.
S Read freeze frame data using a hand-held tester Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and
other data, from the time the malfunction occurred.
1 Confirm DTC.
(a) Turn the ignition switch to OFF and wait for 10 seconds.
(b) Turn the ignition switch to ON.
(c) Turn the ignition switch to OFF and wait for 10 seconds.
(d) Connect a hand-held tester to the DLC3.
(e) Turn the ignition switch to ON and turn the tester ON.
(f) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(g) Confirm DTCs and freeze frame data.
If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below.
DTCs P043E P2401
P0441 P0450 P0451 P0452 P0453 P0455 P0456 P2419 P2420
Malfunctioning Areas P043F P2402
0.02 inch orifice clogged
0.02 inch orifice high-flow
Purge VSV stuck open
Purge VSV stuck closed
Pressure sensor signal becomes fixed/flat
Pressure sensor noise
Pressure sensor voltage low
Pressure sensor voltage high
Gross leak
Small leak
Vacuum pump stuck OFF
Vacuum pump stuck ON
Vent valve stuck ON (closed)
Vent valve stuck OFF (vent)
NOTICE:
If the 0.02 inch reference pressure difference between the first and second checks is greater than
the specification, the DTCs corresponding to the reference pressure (P043E, P043F, P0441, P0455,
P0456, P2401, P2420) will be all stored.
NEXT
DI-375
DIAGNOSTICS - ENGINE (1GR-FE)
2 Perform EVAP system check.
NOTICE:
S In the EVAP SYSTEM CHECK (AUTO OPERATION), the series of 5 EVAP SYSTEM CHECK steps
is performed automatically by the hand-held tester. It takes a maximum of approximately 18
minutes.
S Do not perform the EVAP SYSTEM CHECK when the fuel tank is more than 90% full because
the cut-off valve may be closed and making the leak check of the fuel tank unavailable.
S Do not run the engine in this step.
S When the temperature of the fuel is 35_C (95_F) or more, a large amount of vapor forms and any
check results become inaccurate. When performing the EVAP SYSTEM CHECK, keep the tem-
perature below 35_C (95_F).
(a) Clear DTC (See page DI-42).
(b) On the hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYS-
TEM CHECK / EVAP SYS CHECK / AUTO OPERATION.
(c) After the EVAP SYSTEM CHECK is completed, check for pending DTCs by selecting the following
menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
HINT:
If no pending DTC is displayed, perform the Monitor Confirmation after this repair is completed. After this
confirmation, check for pending DTCs. If no DTC is displayed, the EVAP system is normal.
NEXT
DI-376
DIAGNOSTICS - ENGINE (1GR-FE)
3 Perform EVAP system manual operation check.
EVAP SYSTEM CHECK
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
EVAP Pressure
Positive Gross Leak
Negative
Second 0.02 inch
Small Leak Leak Pressure
First 0.02 inch Standard x 0.2
Leak Pressure
Standard No Leak
Normal Pressure
Steps 1/5 2/5 3/5 4/5 5/5
Time 10 60 Within 15 minutes 10 60
(Reference) sec sec sec sec
A23497
NOTICE:
S In the EVAP SYSTEM CHECK (MANUAL OPERATION), the series of 5 EVAP SYSTEM CHECK
steps is performed manually by the hand-held tester.
S Do not perform the EVAP SYSTEM CHECK when the fuel tank is more than 90% full because
the cut-off valve may be closed and making the leak check of the fuel tank unavailable.
S Do not run the engine in this step.
S When the temperature of the fuel is 35_C (95_F) or more, a large amount of vapor forms and any
check results become inaccurate. When performing the EVAP SYSTEM CHECK, keep the tem-
perature below 35_C (95_F).
(a) Clear DTC (See page DI-42).
(b) On the hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYS-
TEM CHECK / EVAP SYS CHECK / MANUAL OPERATION.
NEXT
DI-377
DIAGNOSTICS - ENGINE (1GR-FE)
4 Perform EVAP system step 1/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
Pressure Sensor Noise
EVAP Pressure
Positive
Negative
OK
First 0.02 inch
Leak Pressure
Standard
Steps 1/5
Time 10
(Reference) sec
A23499
(a) Check the EVAP pressure in step 1/5.
Result:
DTCs* Test Results Suspected Trouble Areas Proceed To
Virtually no variation in EVAP pressure Not yet determined A
EVAP pressure fluctuates by "0.3 kPa
P0451 Pressure sensor noising B
(2.25 mmHg) or more
*: The DTCs relating to the EVAP system displayed on a hand-held tester when checking.
B Go to step 30
A
DI-378
DIAGNOSTICS - ENGINE (1GR-FE)
5 Perform EVAP system step 1/5 to 2/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
EVAP Pressure
Positive
Negative
Vacuum Pump Stuck ON
First 0.02 inch
Leak Pressure
Standard
Steps 1/5 2/5
Time 10 60
(Reference) sec sec
A23500
(a) Check the EVAP pressure in step 1/5 and 2/5.
Result:
DTCs* Test Results Suspected Trouble Areas Proceed To
Virtually no variation in EVAP pressure during step
1/5. Then decreases to 0.02 inch leak pressure Not yet determined A
standard*
Small difference between EVAP pressures during
P2402 Vacuum pump stuck ON B
steps 1/5 and 2/5
*: The DTCs relating to the EVAP system displayed on a hand-held tester when checking.
HINT:
The 0.02 inch leak pressure standard is the value determined in step 2/5.
B Go to step 23.
A
DI-379
DIAGNOSTICS - ENGINE (1GR-FE)
6 Perform EVAP system step 2/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
Vacuum Pump Stuck OFF
EVAP Pressure 4 sec 0.02 inch Orifice High-flow
Positive Vent Valve Stuck closed
Negative
OK
First 0.02 inch
Leak Pressure
Standard
0.02 inch Orifice Clogged
Steps 2/5 3/5
Time 60 Within 15 minutes
(Reference) sec
A23501
HINT:
Make a note of the pressures checked in steps (a) and (b) below.
(a) Check the EVAP pressure 4 seconds after the vacuum pump is activated*.
(b) Check the EVAP pressure again when it has stabilized. This pressure is the 0.02 inch leak pressure
standard.
*: The vacuum pump begins to operate as step 1/5 is proceeded to step 2/5.
Result:
DTCs* Test Results Suspected Trouble Areas Proceed To
EVAP pressure in step (b) between -4.85 kPa
Not yet determined A
and -1.06 kPa (-36.38 mmHg and -7.95 mmHg)
EVAP pressure in step (b) -1.06 kPa (-7.95 S 0.02 inch orifice high-flow
P043F and P2401 B
mmHg) or more S Vacuum pump stuck OFF
EVAP pressure in step (b) below -4.85 kPa
P043E 0.02 inch orifice clogged C
(-36.38 mmHg)
EVAP pressure in step (a) more than -1.06 kPa
P2419 Vent valve stuck closed D
(-7.95 mmHg)
*: The DTCs relating to the EVAP system displayed on a hand-held tester when checking.
B Go to step 11
C Go to step 30
D Go to step 19
A
DI-380
DIAGNOSTICS - ENGINE (1GR-FE)
7 Perform EVAP system step 2/5 to 3/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
EVAP Pressure
Positive
Negative
Vent Valve Stuck open (vent)
First 0.02 inch
Leak Pressure
Standard
Steps 2/5 3/5
Time Within 15 minutes
(Reference)
A23502
(a) Check the EVAP pressure increase in step 3/5.
Result:
DTCs* Test Results Suspected Trouble Areas Proceed To
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step Not yet determined A
2/5 to step 3/5
No variation in EVAP pressure despite proceeding
P2420 Vent valve stuck open (vent) B
from step 2/5 to step 3/5
No variation in EVAP pressure during steps 1/5
P0451 Pressure sensor malfunction stuck C
through 3/5
*: The DTCs relating to the EVAP system displayed on a hand-held tester when checking.
B Go to step 19.
C Go to step 30.
A
DI-381
DIAGNOSTICS - ENGINE (1GR-FE)
8 Perform EVAP system step 3/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
EVAP Pressure
Positive
Negative
First 0.02 inch
Leak Pressure
Standard
Steps 3/5
Time Within 15 minutes
(Reference) A23502
(a) Wait until the EVAP pressure change is less than 0.1 kPa (0.75 mmHg) for 30 seconds.
(b) Measure the EVAP pressure and record it.
HINT:
A few minutes are required for the EVAP pressure to become saturated. When there is little fuel in the fuel
tank, it takes up to 12 minutes.
NEXT
DI-382
DIAGNOSTICS - ENGINE (1GR-FE)
9 Perform EVAP system step 4/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
EVAP Pressure
Positive OK
Negative
Purge VSV Stuck Closed
First 0.02 inch
Leak Pressure
Standard
Steps 4/5
Time 10
(Reference) sec
A23504
(a) Check the EVAP pressure in step 4/5.
DTCs* Test Results Suspected Trouble Areas Proceed To
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step Not yet determined A
3/5 to step 4/5
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
Problems in EVAP hose between pure VSV and
P0441 or more within 10 seconds of proceeding from step B
throttle body
3/5 to step 4/5
Variation in EVAP pressure is less than 0.3 kPa
P0441 (2.25 mmHg) for 10 seconds, after proceeding from Purge VSV stuck closed C
step 3/5 to step 4/5
*: The DTCs relating to the EVAP system displayed on a hand-held tester when checking.
B Go to step 15.
C Go to step 12.
A
DI-383
DIAGNOSTICS - ENGINE (1GR-FE)
10 Perform EVAP system step 5/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
EVAP Pressure
Positive Gross Leak
Negative
Second 0.02 inch
Small Leak Leak Pressure
First 0.02 inch Standard x 0.2
Leak Pressure
Standard No Leak
Steps 5/5
Time 60
(Reference) sec
A23505
(a) Check the EVAP pressure in step 5/5.
(b) Compare the EVAP pressure in step 3/5 and the second 0.02 inch leak pressure standard (step 5/5).
Result:
DTCs* Test Results Suspected Trouble Areas Proceed To
EVAP pressure (step 3/5) lower than the second
Not yet determined (no leakage from EVAP system) A
0.02 inch leak pressure standard (step 5/5)
P0441 and EVAP pressure (step 3/5) higher than [second 0.02 S Purge VSV stuck open
B
P0455 inch leak pressure standard (step 5/5) x 0.2] S EVAP gross leak
EVAP pressure (step 3/5) higher than second 0.02
P0456 EVAP small leak B
inch leak pressure standard (step 5/5)
*: The DTCs relating to the EVAP system displayed on a hand-held tester when checking.
A Go to step 36.
B Go to step 12.
DI-384
DIAGNOSTICS - ENGINE (1GR-FE)
11 Perform EVAP system step 3/5 check.
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
Vacuum Pump Stuck OFF
EVAP Pressure
Positive
Negative
0.02 inch Orifice High-flow
0.02 inch
Leak Pressure
Standard
Steps 2/5 3/5
Time Within 15 minutes
(Reference)
A23506
(a) Check the EVAP pressure in step 3/5.
Result:
DTCs* Test Results Suspected Trouble Areas Proceed To
EVAP pressure less than [0.02 inch leak pressure
0.02 inch orifice high-flow A
standard x 0.2]
EVAP pressure more than [0.02 inch leak pressure
Vacuum pump stuck OFF B
standard x 0.2]
*: The DTCs relating to the EVAP system displayed on a hand-held tester when checking.
HINT:
The 0.02 inch leak pressure standard is the value determined in step 2/5.
A Go to step 30.
B Go to step 23.
DI-385
DIAGNOSTICS - ENGINE (1GR-FE)
12 Perform active test of purge VSV.
PREPARATION:
Purge VSV
(a) On the hand-held tester, select the following menu items:
Hose DIAGNOSIS / ENHANCED OBD II/ ACTIVE TEST /
EVAP VSV.
(b) Disconnect the hose (connected to the canister) from the
purge VSV.
(c) Start the engine.
CHECK:
cmc0691 (a) On the tester, turn off the purge VSV (EVAP VSV: OFF).
(b) Use your finger to confirm that the purge VSV has no suc-
tion.
(c) Using the tester, turn on the purge VSV (EVAP VSV: ON).
(d) Use your finger to confirm that the purge VSV has suction.
RESULT:
Test Results Suspected Trouble Areas Proceed To
No suction when purge VSV turned OFF, and suction applied
Purge VSV normal A
when tuned ON
Suction applied when purge VSV turned OFF Purge VSV stuck open B
S Purge VSV stuck closed
No suction when purge VSV turned ON S Problems with EVAP hose between purge VSV and throttle C
body
B Go to step 14.
C Go to step 15.
A
DI-386
DIAGNOSTICS - ENGINE (1GR-FE)
13 Check fuel tank cap.
CHECK:
(a) Check that the fuel tank cap is correctly installed and confirm the fuel tank cap meets OEM specifica-
tion.
HINT:
If an EVAP tester is available, check the fuel tank cap using the tester.
(1) Tighten the fuel tank cap.
(2) Remove the fuel tank cap and install it onto a fuel tank cap adaptor.
(3) Connect an EVAP tester pump hose to the adaptor, and pressurize to 3.2 to 3.7 kPa (24 to 28
mmHg) using an EVAP tester pump.
(4) Seal the adaptor and wait for 2 minutes.
(5) Check the pressure. If the pressure is 2 kPa (15 mmHg) or more, the fuel tank cap is normal.
PREPARATION:
Test Results Suspected Trouble Areas Proceed To
Fuel tank cap correctly installed A
S Fuel tank cap improperly installed
Fuel tank cap loose S Defective fuel tank cap B
S Fuel tank cap does not meet OEM specifications
No fuel tank cap C
A Go to step 29.
B Go to step 27.
C Go to step 28.
DI-387
DIAGNOSTICS - ENGINE (1GR-FE)
14 Inspect EVAP VSV.
Hose PREPARATION:
Purge VSV
(a) Turn the ignition switch to OFF.
(b) Disconnect the V4 purge VSV connector.
(c) Disconnect the hose (connected to the canister) from the
purge VSV.
(d) Start the engine.
CHECK:
Use your finger to confirm that the purge VSV has no suction.
cmc0690
RESULT:
Test Results Suspected Trouble Areas Proceed To
No suction ECM A
Suction applied Purge VSV B
A Go to step 34.
B Go to step 30.
15 Check EVAP hose between purge VSV and throttle body.
PREPARATION:
Purge VSV
(a) Disconnect the hose (connected to the throttle body) from
Hose the purge VSV.
(b) Start the engine.
CHECK:
(a) Use your finger to confirm that the hose has suction.
cmc0691
RESULT:
Test Results Suspected Trouble Areas Proceed To
EVAP hose between purge VSV and throttle body
Suction applied A
normal
S Throttle body
No suction S EVAP hose between purge VSV and throttle B
body
B Go to step 26.
A
DI-388
DIAGNOSTICS - ENGINE (1GR-FE)
16 Inspect EVAP VSV.
PREPARATION:
(a) Remove the purge VSV.
(b) Apply battery voltage to the terminals of the purge VSV.
Battery CHECK:
Using an air gun, confirm that air flows from port A to port B.
Air
B02272
RESULT:
Test Results Suspected Trouble Areas Proceed To
EVAP hose between purge VSV and throttle body
Suction applied A
normal
S Throttle body
No suction S EVAP hose between purge VSV and throttle B
body
B Go to step 31.
A
17 Measure purge VSV terminal voltage.
Wire Harness Side: PREPARATION:
Purge VSV Connector (a) Disconnect the V4 purge VSV connector.
(b) Turn the ignition switch to ON.
CHECK:
V4 (a) Measure the voltage between terminal 1 of the purge VSV
connector and the body ground.
Front View
B17440
RESULT:
Test Results Suspected Trouble Areas Proceed To
Between 11 V and 14 V Normal A
Wire harness or connectors between purge VSV
Other than result above B
and ECM
B Go to step 32.
A
DI-389
DIAGNOSTICS - ENGINE (1GR-FE)
18 Check for open and short circuit in harness and connector between purge VSV
and ECM.
PREPARATION:
E7
Disconnect the E7 ECM connector and the V4 purge VSV con-
nector.
CHECK:
Check the resistance.
OK:
Standard:
Tester Connections Specified Conditions
PRG B17412 E7-34 (PRG) - V4-1 Below 1
E7-34 (PRG) - Body ground 10 k or higher
Wire Harness Side: V4-1 - Body ground 10 k or higher
Purge VSV Connector
OK Go to step 35.
V4
NG Go to step 32.
Front View
B17440
19 Perform active test for vent valve.
PREPARATION:
(a) Turn the ignition switch to ON.
E3
(b) On the hand-held tester, select the following menu items:
DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST/ VENT
VALVE (ALONE).
CHECK:
Measure the voltage between terminal VPMP of the ECM con-
nector and the body ground when the vent valve is turned ON
VPMP B17411 (close) and OFF (vent) using the tester.
RESULT:
Test Results Suspected Trouble Areas Proceed To
Between 9 V and 14 V when OFF
Vent valve A
Below 3 V when ON
Below 3 V when OFF and ON ECM B
A Go to step 22.
B Go to step 35.
DI-390
DIAGNOSTICS - ENGINE (1GR-FE)
20 Perform active test for vent valve.
PREPARATION:
(a) Turn the ignition switch to ON.
E3
(b) On the hand-held tester, select the following menu items:
DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST/ VENT
VALVE (ALONE).
CHECK:
Measure the voltage between terminal VPMP of the ECM con-
nector and the body ground when the vent valve is turned ON
VPMP B17411 (close) and OFF (vent) using the tester.
RESULT:
Test Results Suspected Trouble Areas Proceed To
Below 3 V when OFF and ON Power source of vent valve A
Between 9 V and 14 V when OFF
Vent valve B
Below 3 V when ON
Between 9 V and 14 V when OFF and ON ECM C
B Go to step 24.
C Go to step 35.
A
DI-391
DIAGNOSTICS - ENGINE (1GR-FE)
21 Inspect pump module power source circuit.
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the L4 canister connector.
(c) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminal 9 of the canister connec-
L4
tor and the body ground.
A23446
Wire Harness Side:
Canister Connector
L4
Front View
A23508
RESULT:
Test Results Suspected Trouble Areas Proceed To
Between 9 V and 14 V Normal A
Between 0 V and 3 V Power source wire harness of vent valve B
B Go to step 32.
A
DI-392
DIAGNOSTICS - ENGINE (1GR-FE)
22 Inspect vent valve operation of pump module.
Charcoal Canister Assy: PREPARATION:
8 (-) 9 (+) (a) Disconnect the L4 canister connector.
(b) Turn the ignition switch to OFF.
(c) Apply the battery voltage to terminals 9 and 8 of the pump
module.
CHECK:
Touch the pump module to confirm the vent valve operation.
B17423
RESULT:
Test Results Suspected Trouble Areas Proceed To
Operating Wire harness between vent valve and ECM A
Not operating Vent valve B
A Go to step 32.
B Go to step 30.
23 Perform active test for vacuum pump.
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