check engine TOYOTA SEQUOIA 2001 Service Repair Manual

B17412PRG
E8
B17440
Wire Harness Side:
Purge VSV Connector
V4
Front View
B17411VPMP
E4
± DIAGNOSTICSENGINE
DI±481
675 Author: Date:
2005 SEQUOIA (RM1146U)
18 Check for open and short circuit in harness and connector between purge VSV
and ECM.
PREPARATION:
Disconnect the E8 ECM connector and the V4 purge VSV con-
nector.
CHECK:
Check the resistance.
OK:
Standard:
Tester ConnectionsSpecified Conditions
E8±34 (PRG) ± V4±1Below 1 W
E8±34 (PRG) ± Body ground10 kW or higher
V4±1 ± Body ground10 kW or higher
OK Go to step 35.
NG Go to step 32.
19 Perform active test for vent valve.
PREPARATION:
(a) Turn the ignition switch to ON.
(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
(close) and OFF (vent) using the tester.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Between 9 V and 14 V when OFF
Below 3 V when ONVent valveA
Below 3 V when OFF and ONECMB
A Go to step 22.
B Go to step 35.

B17411VPMP
E4
DI±482
± DIAGNOSTICSENGINE
676 Author: Date:
2005 SEQUOIA (RM1146U)
20 Perform active test for vent valve.
PREPARATION:
(a) Turn the ignition switch to ON.
(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
(close) and OFF (vent) using the tester.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Below 3 V when OFF and ONPower source of vent valveA
Between 9 V and 14 V when OFF
Below 3 V when ONVent valveB
Between 9 V and 14 V when OFF and ONECMC
B Go to step 24.
C Go to step 35.
A

A23446
L5
A23508
Wire Harness Side:
Canister Connector
Front View
L5
± DIAGNOSTICSENGINE
DI±483
677 Author: Date:
2005 SEQUOIA (RM1146U)
21 Inspect pump module power source circuit.
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the L5 canister connector.
(c) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminal 9 of the canister connec-
tor and the body ground.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Between 9 V and 14 VNormalA
Between 0 V and 3 VPower source wire harness of vent valveB
B Go to step 32.
A

B17423
8 (±) 9 (+)Charcoal Canister Assy:
B17411
MPMP
E4
DI±484
± DIAGNOSTICSENGINE
678 Author: Date:
2005 SEQUOIA (RM1146U)
22 Inspect vent valve operation of pump module.
PREPARATION:
(a) Disconnect the L5 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.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
OperatingWire harness between vent valve and ECMA
Not operatingVent valveB
A Go to step 32.
B Go to step 30.
23 Perform active test for vacuum pump.
PREPARATION:
On the hand±held tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VACUUM
PUMP (ALONE).
CHECK:
Measure the voltage between terminal MPMP of the ECM con-
nector and the body ground when the vacuum pump is turned
ON and OFF using the tester.
Result:
Tests ResultsSuspected Trouble AreasProceed To
Between 0 V and 3 V when OFF
Between 9 V and 14 V when ONECM normalA
Between 9 V and 14 V when OFF
Between 0 V and 3 V when ONECMB
B Go to step 35.
A

A23446
L5
A23508
Wire Harness Side:
Canister Connector
Front View
L5
± DIAGNOSTICSENGINE
DI±485
679 Author: Date:
2005 SEQUOIA (RM1146U)
24 Check for open and short circuit in harness and connecter between pump mod-
ule and ECM.
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the L5 canister connector.
(c) Turn the ignition switch to ON.
(d) On the hand±held tester, select the following menu
items:DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST
/ VACUUM PUMP (ALONE).
(e) Turn the vacuum pump ON.
CHECK:
Measure the voltage between terminal 1 of the canister connec-
tor and the body ground.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Between 9 V and 14 VNormalA
Between 0 V and 3 VWire harness between ECM and vacuum pumpB
B Go to step 32.
A

A23508
Wire Harness Side:
Canister Connector
Front View
L5
DI±486
± DIAGNOSTICSENGINE
680 Author: Date:
2005 SEQUOIA (RM1146U)
25 Check for open and short in harness and connector between pump module and
ECM.
PREPARATION:
(a) Disconnect the L5 canister connector.
(b) Turn the ignition switch to OFF.
CHECK:
Check the resistance between terminal 6 of the canister con-
nector and the body ground.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Below 1 WVacuum pumpA
10 kW or moreWire harness between vacuum pump and body
groundB
A Go to step 30.
B Go to step 32.
26 Inspect throttle body.
PREPARATION:
(a) Stop the engine.
(b) Disconnect the EVAP hose from the throttle body.
(c) Start the engine.
CHECK:
(a) Use your finger to confirm that the port of the throttle body has suction.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Suction appliedEVAP hose between throttle body and purge VSVA
No suctionThrottle bodyB
A Go to step 33.
B Go to step 34.

DI±488
± DIAGNOSTICSENGINE
682 Author: Date:
2005 SEQUOIA (RM1146U)
30 Replace charcoal canister.
NEXT Go to step 37.
31 Replace EVAP VSV (See page EC±8).
(a) Disconnect the connector and the hoses from the purge VSV.
(b) Remove the purge VSV.
(c) Install a new purge VSV.
(d) Reconnect the connector and hoses.
NEXT Go to step 37.
32 Repair or replace wire harness or connector.
NEXT Go to step 37.
33 Replace EVAP hose between EVAP VSV and throttle body.
NEXT Go to step 37.
34 Inspect throttle body.
(a) Remove the throttle body (see page SF±42).
(b) Check that the EVAP purge port of the throttle body is not clogged. If necessary, replace the throttle
body.
NEXT Go to step 37.
35 Replace ECM (See page SF±80)
NEXT Go to step 37.

± DIAGNOSTICSENGINE
DI±489
683 Author: Date:
2005 SEQUOIA (RM1146U)
36 Repair or replace parts and components indicated by output DTCs.
(a) Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was
brought in.
NEXT Go to step 37.
37 Perform EVAP system auto operation check.
NOTICE:

In the EVAP SYSTEM CHECK (AUTO OPERATION), the series of 4 EVAP SYSTEM CHECK steps
is performed automatically. It takes a maximum of approximately 15 minutes.

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.

Do not run the engine in this step.

When the temperature of the fuel is 35C (95F) or more, a large amount of vapor forms and any
check results become inaccurate. When performing an EVAP SYSTEM CHECK, keep the tem-
perature below 35C
(95F).
(a) Clear DTCs (see page DI±43).
(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 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 found, the repair has been successfully completed.
NEXT
Completed
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])

DI±490
± DIAGNOSTICSENGINE
684 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Monitor Conditions
(1) Allow the engine to idle for at least 5 minutes.
(2) Turn the ignition switch to 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 to 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 to 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.
HINT:
If INCMP is displayed, the monitor is not completed. Make sure that the preconditions have been met, and
perform the Monitor Conditions again.

± DIAGNOSTICSENGINE
DI±491
685 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR RESULT
Refer to page DI±26 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 (refer to ºConfirmation Monitorº).

MID (Monitor Identification Data) is assigned to each emissions±related component.

TID (Test Identification Data) is assigned to each test value.

Scaling is used to calculate the test value indicated on generic OBD ll scan tools.
EVAP±Key±off monitor
MIDTIDScalingDescription of Test ValueMinimum Test LimitMaximum Test Limit
$3D$C9Multiply by 0.01
(kPa)Test value for small leak (P0456):
Refer to pressure D*.Minimum test limit for small
leakMaximum test limit for small
leak
$3D$CAMultiply by 0.01
(kPa)Test value for gross leak (P0455):
Refer to pressure E*.Minimum test limit for gross
leakMaximum test limit for gross
leak
$3D$CBMultiply by 0.01
(kPa)Test value for vacuum pump stuck OFF
(P2401):
Refer to pressure A*.Minimum test limit for vacuum
pump stuck OFFMaximum test limit for vacuum
pump stuck OFF
$3D$CDMultiply by 0.01
(kPa)Test value for vacuum pump stuck ON
(P2402):
Refer to pressure A*.Minimum test limit for vacuum
pump stuck ONMaximum test limit for vacuum
pump stuck ON
$3D$CEMultiply by 0.01
(kPa)Test value for vent valve stuck OFF
(vent) (P2420):
Refer to pressure C*.Minimum test limit for vent
valve stuck ONMaximum test limit for vent
valve stuck ON
$3D$CFMultiply by 0.01
(kPa)Test value for vent valve stuck ON
(closed) (P2419):
Refer to pressure A*.Minimum test limit for vent
valve stuck OFFMaximum test limit for vent
valve stuck OFF
$3D$D0Multiply by 0.01
(kPa)Test value for 0.02 inch orifice low flow
(P043E):
Refer to pressure B*.Minimum test limit for 0.02
inch orifice low flowMaximum test limit for 0.02
inch orifice low flow
$3D$D1Multiply by 0.01
(kPa)Test value for 0.02 inch orifice high flow
(P043F):
Refer to pressure A*.Minimum test limit for 0.02
inch orifice high flowMaximum test limit for 0.02
inch orifice high flow
$3D$D4Multiply by 0.01
(kPa)Test value for purge VSV stuck close
(P0441):
Refer to pressure F*.Minimum test limit for purge
VSV stuck closeMaximum test limit for purge
VSV stuck close
$3D$D5Multiply by 0.01
(kPa)Test value for purge VSV stuck open
(P0441):
Refer to pressure E*.Minimum test limit for purge
VSV stuck openMaximum test limit for purge
VSV stuck open
$3D$D7Multiply by 0.01
(kPa)Test value for purge flow (P0441):
Refer to pressure G*.Minimum test limit for purge
flowMaximum test limit for purge
flow
* Pressure A to G are indicated as shown in the diagram below.