2001 TOYOTA HIGHLANDER fuel pressure

G38126
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak PressureON: Open
NegativeONON
Steps
(Reference)Within 15 minutesON
First 0.02 inch
3/5
OFF: Closed
OFF: Vent ON: Closed
Time Standard
05-330
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
520 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
8 PERFORM EVAP SYSTEM CHECK(STEP 3/5)
(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 15 minutes.
NEXT

A85254
Purge VSV
Hose (to canister)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-335
525 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
13 CHECK FUEL TANK CAP ASSY
(a) Check that the fuel tank cap is correctly installed.
(b) Confirm that the fuel tank cap is tightened until a few click sounds are heard.
HINT:
If an EVAP tester is available, check the fuel tank cap using the tester.
(1) Remove the fuel tank cap and install it onto a fuel tank cap adaptor.
(2) 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.
(3) Seal the adaptor and wait for 2 minutes.
(4) Check the pressure. If the pressure is 2 kPa (15 mmHg) or more, the fuel tank cap is normal.
(5) Reinstall the fuel tank cap.
Result:
Test ResultsSuspected trouble AreasProceed To
Fuel tank cap correctly installed'A
Fuel tank cap loose

Fuel tank cap improperly installed

Defective fuel tank cap

Fuel tank cap does not meet OEM specifications
B
No fuel tank cap'C
A Go to step 29
B Go to step 27
C Go to step 28
14 INSPECT VACUUM SWITCHING VALVE ASSY NO.1
(a) Turn the ignition switch to OFF.
(b) Disconnect the purge VSV connector.
(c) Disconnect the hose (connected to the canister) from the
purge VSV.
(d) Start the engine.
(e) Use your finger to confirm that the purge VSV has no suc-
tion.
Result:
Test ResultsSuspected Trouble AreasProceed To
No suctionECMA
Suction appliedPurge VSVB
(f) Reconnect the purge VSV connector.
(g) Reconnect the hose.
A Go to step 35
B Go to step 31

A85255
Pressure Gauge
Pressure
B06546
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-343
533 Author
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
28 REPLACE FUEL TANK CAP ASSY
HINT:
When installing the fuel tank cap, tighten it until a few click sounds are heard.
NEXT Go to step 37
29 REPAIR EVAP LEAK PART
(a) Reinstall the fuel cap.
(b) Remove the exhaust tail pipe.
(c) Remove the heat insulator under the canister.
(d) Pinch the atmospheric side hose of the pump module with
the clip to close the canister's passage to air.
(e) Connect the pressure gauge (SST) to the service port
(green cap near the air cleaner box).
(f) Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28
mmHg).
NOTICE:
More than 35 mmHg of pressure will damage the EVAP sys-
tem. Pay attention to the pressure.
(g) Apply soapy water to the piping and connecting parts of
the EVAP system. Look for the area where bubbles ap-
pear. This area cause leaks.
HINT:

If the system has leaks, a whistling sound will be heard.

Disconnect the hose between canister and fuel tank from
the canister. Close the canister on the area where the
hose was connected and perform an inspection. The fuel
tank can be eliminated from the suspected areas for leak
checks.
(h) Repair or replace the leak point.
NEXT Go to step 37
30 REPLACE CHARCOAL CANISTER ASSY
NEXT Go to step 37

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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Monitor Confirmation
HINT:
After a repair, check Monitor Status by performing the Key-Off Monitor Confirmation and Purge Flow Monitor
Confirmation described below.
1. KEY-OFF MONITOR CONFIRMATION
(a) Preconditions
The monitor will not run unless:

The vehicle has been driven for 10 minutes or more (in a city area or on a free way)

The fuel tank is less than 90% full

The altitude is less than 8,000 ft (2,400 m)

The Engine Coolant Temperature (ECT) is between 4.4C and 35C (40F and 95F)

The Intake Air Temperature (IAT) is between 4.4C and 35C (40F and 95F)

The vehicle remains stationary (the vehicle speed is 0 mph [0 km/h])
(b) Monitor Conditions
(1) Allow the engine to idle for at least 5 minutes.
(2) Turn the ignition switch OFF and wait for 6 hours (8 or 10.5 hours).
HINT:
Do not start the engine until checking MONITOR STATUS. If the engine is started, the steps described above
must be repeated.
(c) Monitor Status
(1) Connect a hand-held tester to the DLC3.
(2) Turn the ignition switch ON and turn the tester ON.
(3) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / MONITOR
STATUS.
(4) Check the Monitor Status displayed on the tester.
HINT:
If INCMP is displayed, the monitor is not completed. Make sure that the preconditions have been met, and
perform the Monitor Conditions again.
2. PURGE FLOW MONITOR CONFIRMATION (P0441)
HINT:
Perform this monitor confirmation after the Key-Off Monitor Confirmation shows COMPL (complete).
(a) Preconditions
The monitor will not run unless:

The vehicle has been driven for 10 minutes or more (in a city area or on a free way)

The ECT is between 4.4C and 35C (40F and 95F)

The IAT is between 4.4C and 35C (40F and 95F)
(b) Monitor Conditions
(1) Release the pressure from the fuel tank by removing and reinstalling the fuel tank cap.
(2) Warm the engine up until the ECT reaches more than 75C (167F).
(3) Increase the engine speed to 3,000 rpm once.
(4) Allow the engine to idle and turn A/C ON for 1 minute.
(c) Monitor Status
(1) Turn the ignition switch OFF (where ON or the engine is running).
(2) Connect a hand-held tester to the DLC3.
(3) Turn the ignition switch to ON and turn the tester ON.
(4) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / MONITOR
STATUS.
(5) Check the Monitor Status displayed on the tester.

A67586
F12
Fuel Pump Wire Harness Side
A53765
E5
ECM
FC
05-354
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544 Author
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(b) Check the wire harness between the fuel pump and body
ground.
(1) Disconnect the F12 fuel pump connector.
(2) Measure the resistance between the wire harness
side connector and body ground.
Standard:
Tester ConnectionSpecified Condition
F12-5 - Body groundBelow 1 W
OK REPAIR OR REPLACE HARNESS AND
CONNECTOR
NG
REPLACE ECM (See page 10-9)
OBD II scan tool (excluding hand-held tester):
1 CHECK FUEL PUMP OPERATION (See Page 11-4)
(a) Check if there is pressure in the fuel inlet hose.
HINT:
The pipe has fuel pressure if the sound of flowing fuel can be heard.
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOMS TABLE
(See page 05-31)
NG
2 CHECK RELAY OPERATION (CIRCUIT OPENING RELAY)
(a) When connecting between terminal FC of the ECM con-
nector and body ground, check relay operation.
OK: Noise can be heard from the circuit opening
relay.
OK Go to step 6
NG

A82390
Fast SensorSlow Sensor Locus Length
A/F Output (V)
Fuel Trim
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2A00 A/F SENSOR CIRCUIT SLOW RESPONSE
(BANK 1 SENSOR 1)
CIRCUIT DESCRIPTION
Refer to DTC P2195 on page 05-269.
DTC No.DTC Detection ConditionTrouble Area
P2A00
In conditions (a), (b) and (c), when A/F sensor output voltage
change value is below regular value against fuel trim change
value, ECM judges that A/F sensor circuit has slow response:
(2 trip detection logic)
(a) Engine is warmed up
(b) Engine speed 1,400 rpm or more
(c) Vehicle speed 60 to 120 km/h (37 to 74 mph)

Open or short in A/F sensor circuit

A/F sensor

A/F sensor heater

EFI relay

Open or short in A/F sensor and EFI relay circuits

Air induction system

Fuel pressure

Injector

PCV hose connection

ECM
MONITOR DESCRIPTION
The Air-Fuel ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. Based on the output
voltage, the ECM determines if the air-fuel ratio is RICH or LEAN and adjusts the stoichiometric air-fuel ratio.
The ECM also checks the fuel injection volume compensation value to check if the A/F sensor is deteriorating
or not. A/F sensor response deterioration is determined by the ratio of the A/F sensor output voltage variation
and fuel trim variation.
05EW5-06

+25 %
-12.5 %
More than 3.35 V
Less than 3.0 V
Case 1
Case 2
Case 3
Case 4
Output voltage of A/F sensor
(sensor 1)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2)Main suspect
trouble area
OK
+25 %
-12.5 %
More than 3.35 V
Less than 3.0V
Injection volume
Output voltage
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
A/F sensor
(A/F sensor, heater, A/F sen-
sor circuit)
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NGExtremely rich or lean actual
air-fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost
No reaction
Almost
No reaction
Almost
No reaction Almost
No reaction
'
Heated oxygen sensor
(heated oxygen sensor,
heater, heated oxygen sensor
circuit) 05-304
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume by 12.5% or increases the injection volume by
25%.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
(4) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine idling (press the right or left button).
Result:
A/F sensor reacts in accordance with increase and decrease of injection volume:
+25 % " RICH output: Less than 3.0 V
-12.5 % " LEAN output: More than 3.35 V
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 % " RICH output: More than 0.55 V
-12.5 % " LEAN output: Less than 0.4 V
NOTICE:
The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about
20 seconds of delay at maximum.
The following A/F CONTROL procedure enables a technician to check and graph the voltage outputs of both
the A/F sensor and the heated oxygen sensor.

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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499 Author
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 CHECK CONNECTION OF PCV HOSE
OK: PCV hose is connected correctly and PCV hose has no damage.
NG REPAIR OR REPLACE PCV HOSE
OK
8 CHECK FUEL PRESSURE (See page 11-4)
(a) Check fuel pressure (high or low fuel pressure).
Standard:
ItemSpecified Condition
Fuel pressure304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 55 psi)
NG REPAIR OR REPLACE FUEL SYSTEM
OK
9 INSPECT FUEL INJECTOR ASSY (See page 11-7)
(a) Check injector injection (high or low fuel injection quantity or poor injection pattern).
Standard:
Injection VolumeDifference Between Each Injector
76 to 91 cm3 (4.6 to 5.5cu in.) / 15 seconds15 cm3 (0.9 cu in.) or less
NG REPLACE FUEL INJECTOR ASSY
(See page 11-10)
OK
10 REPLACE AIR FUEL RATIO SENSOR
GO
11 PERFORM CONFIRMATION DRIVING PATTERN (See page 05-269)
HINT:
Clear all DTCs prior to performing the confirmation driving pattern (see page 05-269).
GO