2001 TOYOTA SEQUOIA Page 18

B17411
STA(+) E1(±)
STSW(+)E6
DI±504
± DIAGNOSTICSENGINE
698 Author: Date:
2005 SEQUOIA (RM1146U)
2 Connect hand±held tester, and check STA signal.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
(c) Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG.
CHECK:
Read the STA signal on the hand±held tester while the starter operates.
OK:
Ignition Switch PositionONSTART
STARTER SIGOFFON
NG Go to step 5.
OK
3 Check voltage between terminal STAR, STSW and E1 of ECM connector.
CHECK:
Measure the voltage between the terminals of the E6 ECM con-
nectors, while cranking the engine (ignition switch START posi-
tion).
OK:
Standard:
Tester ConnectionSpecified Condition
STA (E6±11) ± E1 (E6±1)9 to 14 V
STSW (E6±12) ± E1 (E6±1)9 to 14 V
RESULT:
Terminal STARTerminal STSWProceed to
9 to 14 V9 to 14 VA
0 V9 to 14 VB
0 V0 VC
B Replace ECM (See page SF±80).
C Go to step 9.
A

A21559
Engine Room R/B No.2
Starter Relay
± DIAGNOSTICSENGINE
DI±507
701 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check engine room R/B No.2 (Starter relay voltage).
PREPARATION:
Remove the starter relay from the engine room R/B No.2.
CHECK:
Measure the voltage between the terminal of the engine room
R/B and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
Starter relay (5) ± Body ground9 to 14 V
NG Check and repair harness and connector be-
tween starter relay and battery.
OK
8 Check starter (See page ST±15).
NG Repair or replace starter.
OK

I08467
LOCKACC
ON
START
DI±508
± DIAGNOSTICSENGINE
702 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check ignition switch.
PREPARATION:
(a) Remove the lower finish panel.
(b) Disconnect the ignition switch connector.
CHECK:
Check resistance between terminals.
OK:
Standard:
Switch PositionTerminal ConditionSpecified Condition
LOCKAlways10 kW or more
ACC1 ± 3Below 1 W
ON1 ± 2 ± 3
5 ± 6Below 1 W
START1 ± 2
4 ± 5 ± 6Below 1 W
NG Replace ignition switch.
OK
Check for open in harness and connector be-
tween ECM and ignition switch, ignition
switch and battery (See page IN±35).

± DIAGNOSTICSENGINE
DI±509
703 Author: Date:
2005 SEQUOIA (RM1146U)
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
Refer to DTC P0230 on page DI±179.
WIRING DIAGRAM
Refer to DTC P0230 on page DI±179.
INSPECTION PROCEDURE
1 Check fuel pump operation (See page SF±7).
OK Go to step 8.
NG
2 Connect hand±held tester, and check operation of fuel pump relay.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand±held tester main switch ON.
(c) Enter the following menu: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP SPD.
CHECK:
Check the operation of the fuel pump relay when it is switched ON and OFF by the hand±held tester.
OK:
Operating noise can be heard from the relay.
OK Go to step 4.
NG
DID8L±01

A21024
A19288
DI±510
± DIAGNOSTICSENGINE
704 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check operation of fuel pump relay.
PREPARATION:
Remove the fuel pump relay from the engine room R/B.
CHECK:
Inspect the fuel pump relay.
OK:
Terminal No.ConditionSpecified Condition
3 ± 4Apply B+ between
terminals 1 and 210 KW or higher
3 ± 4AlwaysBelow 1 W
3 ± 5Always10 KW or higher
3 ± 5Apply B+ between
terminals 1 and 2Below 1 W
NG Replace fuel pump relay.
OK
4 Check fuel pump (See page SF±7).
NG Repair or replace fuel pump.
OK
5 Check circuit opening relay (See page SF±58).
PREPARATION:
Remove the C/OPN relay from the engine room J/B.
CHECK:
Inspect the C/OPN relay.
OK:
Standard:
Terminal No.ConditionSpecified Condition
3 ± 5Always10 KW or higher
3 ± 5Apply B+ between
terminals 1 and 2Below 1 W
NG Replace circuit opening relay.
OK

B17411FC (+)E4
± DIAGNOSTICSENGINE
DI±511
705 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check for open in harness and connector between circuit opening relay and fuel
pump, and fuel pump and body ground (See page IN±35).
NG Repair or replace harness or connector.
OK
7 Check voltage between terminal FC and E1 of ECM connector.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal FC of the ECM connec-
tor and body ground.
OK:
Voltage: 9 to 14 V
NG Check for open in harness and connector be-
tween battery and FC terminal of ECM (See page
IN±35).
OK
Proceed to problem symptoms table
(See page DI±33).
8 Check fuel pump resistor (See page SF±61).
NG Replace fuel pump resistor.
OK
Check for open in harness and connector between circuit opening relay and fuel pump resistor,
and fuel pump resistor and fuel pump (See page IN±35).

B17418W E5
± DIAGNOSTICSENGINE
DI±513
707 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Troubleshoot each trouble symptom in accordance with the chart below.
MIL remains onStart inspection from step 1
MIL does not light upStart inspection from step 3
1 Clear DTC.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand±held tester main switch ON.
(c) Read the DTC (See page DI±43).
(d) Clear the DTC (See page DI±43).
CHECK:
(a) Check that MIL does not light up.
OK:
Standard: MIL does not light up
OK Repair circuit indicated by output code
(See page DI±58).
NG
2 Check Harness and connector (Check for short in wire harness).
PREPARATION:
(a) Disconnect the E4 ECM connector.
(b) Turn the ignition switch ON.
CHECK:
(a) Check that MIL does not light up.
OK:
Standard: MIL does not light up
OK Replace ECM (See page SF±80).
NG
Check and repair harness and connector be-
tween combination meter and ECM.

DI±514
± DIAGNOSTICSENGINE
708 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check that MIL lights up.
CHECK:
Check that MIL lights up when turning the ignition switch ON.
OK:
Standard: MIL lights up
OK System OK.
NG
4 Inspect combination meter assy (MIL circuit).
See the combination meter troubleshooting on page BE±55.
NG Repair or replace bulb or combination meter as-
sembly.
OK
Check and repair harness and connector be-
tween combination meter and ECM.