Page 681 of 4323
B17419
HosePurge VSV
B17420
HosePurge VSV
± DIAGNOSTICSENGINE
DI±479
673 Author: Date:
2005 SEQUOIA (RM1146U)
14 Inspect EVAP VSV.
PREPARATION:
(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.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
No suctionECMA
Suction appliedPurge VSVB
A Go to step 34.
B Go to step 30.
15 Check EVAP hose between purge VSV and throttle body.
PREPARATION:
(a) Disconnect the hose (connected to the throttle body) from
the purge VSV.
(b) Start the engine.
CHECK:
(a) Use your finger to confirm that the hose has suction.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Suction appliedEVAP hose between purge VSV and throttle body
normalA
No suction
Throttle body
EVAP hose between purge VSV and throttle
body
B
B Go to step 26.
A
Page 682 of 4323
B02272
Battery
Air
B17440
Wire Harness Side:
Purge VSV Connector
V4
Front View
DI±480
± DIAGNOSTICSENGINE
674 Author: Date:
2005 SEQUOIA (RM1146U)
16 Inspect EVAP VSV.
PREPARATION:
(a) Remove the purge VSV.
(b) Apply battery voltage to the terminals of the purge VSV.
CHECK:
Using an air gun, confirm that air flows from port A to port B.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Suction appliedEVAP hose between purge VSV and throttle body
normalA
No suction
Throttle body
EVAP hose between purge VSV and throttle
body
B
B Go to step 31.
A
17 Measure purge VSV terminal voltage.
PREPARATION:
(a) Disconnect the V4 purge VSV connector.
(b) Turn the ignition switch to ON.
CHECK:
(a) Measure the voltage between terminal 1 of the purge VSV
connector and the body ground.
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Between 11 V and 14 VNormalA
Other than result aboveWire harness or connectors between purge VSV
and ECMB
B Go to step 32.
A
Page 683 of 4323

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.
Page 684 of 4323
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
Page 685 of 4323
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
Page 686 of 4323

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
Page 687 of 4323
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
Page 688 of 4323
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.