2001 TOYOTA SEQUOIA terminal TC

B17396
HT +B
AF± AF+ Sensor 1A/F Sensor Component Side:
Front View
DI±456
± DIAGNOSTICSENGINE
650 Author: Date:
2005 SEQUOIA (RM1146U)
1 Check any other DTCs output (in addition to DTC P2A00 or P2A03).
PREPARATION:
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
CHECK:
(a) Read DTCs.
Result:
Display (DTC Output)Proceed To
P2A00 and/or P2A03A
P2A00 and/or P2A03 and other DTCsB
HINT:
If any DTCs other than P2A00 and/or P2A03 are output, troubleshoot those DTCs first.
B Go to DTC chart (See page DI±58).
A
2 Check resistance of air±fuel ratio (A/F) sensor heater.
PREPARATION:
Disconnect the air±fuel ratio (A/F) sensor connector.
CHECK:
Measure resistance between the terminals of the A/F sensor
connector.
OK:
Standard:
Tester ConnectionSpecified Condition
HT (1) ± +B (2)Between 1.8 W and 3.4 W at 20C (68F)
HT (1) ± AF± (4)10 kW or higher
NG Replace air±fuel ratio (A/F) sensor.
OK

A23659
Wire Harness Side:
HT
A38
Sensor 1A/F Sensor Connector
AF+
Front ViewAF±
+B A39
B17415A55007
E7ECM Connector
HA1A
A1A+
A1A±
A2A+
A2A±HA2A
A23512
Reference (Bank 1 Sensor 1 System Drawing):
A/F Sensor A/F Relay
Heater
Sensor
A1A+ HA1A
Duty
Control ECM
From
Battery
A/F Heater
Fuse
A1A±
To EFI Relay
± DIAGNOSTICSENGINE
DI±457
651 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short in harness and connector between ECM and A/F sen-
sor.
PREPARATION:
(a) Disconnect the A38 or A39 A/F sensor connector.
(b) Turn the ignition switch to ON.
CHECK:
(a) Measure the voltage between the +B terminal of the A/F
sensor connector and body ground.
OK:
Standard:
Tester ConnectionsSpecified Conditions
+B (2) ± Body groundBetween 9 V and 14 V
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the E7 ECM connector.
CHECK:
(a) Check the resistance.
OK:
Standard (Check for open):
Tester ConnectionsSpecified Conditions
HT (A38±1) ± HA1A (E7±2)
HT (A39±1) ± HA2A (E7±1)Below 1 W
AF+ (A38±3) ± A1A+ (E7±22)
AF+ (A39±3) ± A2A+ (E7±23)Below 1 W
AF± (A38±4) ± A1A± (E7±30)
AF± (A39±4) ± A2A± (E7±31)Below 1 W
Standard (Check for short):
Tester ConnectionsSpecified Conditions
HT (A38±1) or HA1A (E7±2) ± Body ground
HT (A39±1) or HA2A (E7±1) ± Body ground10 kW or higher
AF+ (A38±3) or A1A+ (E7±22) ± Body ground
AF+ (A39±3) or A2A+ (E7±23) ± Body ground10 kW or higher
AF± (A38±4) or A1A± (E7±30) ± Body ground
AF± (A39±4) or A2A± (E7±31) ± Body ground10 kW or higher

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

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