Page 705 of 4323

A19655A20059
STSW
ACCR
STAR
(NE)
Engine SpeedStarterPark/Neutral
Position SW
N P ST RelayACC Cut
Relay
Ignition
SW
ACC
ST2
ACCR
STSW
STAR BatteryECM
± DIAGNOSTICSENGINE
DI±503
697 Author: Date:
2005 SEQUOIA (RM1146U)
Cranking Hold Function Circuit
CIRCUIT DESCRIPTION
The starter is controlled by the ECM, when the ECM detects a start signal (STSW) from the ignition switch,
this system monitors the engine speed (NE) and continues to operate the starter until it has determined that
the engine has started (engine speed reaches approximately 500 rpm). If the engine is already running and
the ignition switch is turned to START, the ECM will not operate the starter.
WIRING DIAGRAM
Refer to DTC P0617 on page DI±298.
INSPECTION PROCEDURE
Hand±held tester:
1 Check operation of engine cranking.
CHECK:
When turning the ignition switch to the START position, check whether the starter motor starts.
OK:
Starter motor starts.
OK Check for intermittent problems (See page
DI±11).
NG
DID8M±01
Page 706 of 4323

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
Page 707 of 4323
D14154
Component Side:
A19288
± DIAGNOSTICSENGINE
DI±505
699 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check park/neutral position switch.
PREPARATION:
Remove the P1 park/neutral position switch connector.
CHECK:
Check resistance between each terminal shown below when
the shift lever is moved to each range.
Shift rangeTerminal No. to continuity
P1 ± 36 ± 9
R2 ± 3±
N3 ± 56 ± 9
D3 ± 7±
23 ± 4±
L3 ± 8±
OK:
Below 1 W
NG Replace the park/neutral position switch.
OK
Check and repair harness and connector be-
tween park/neutral position switch and ECM.
5 Check starter relay.
(a) Remove the starter relay from the engine room R/B.
(b) Inspect the starter relay.
Standard:
Tester ConnectionSpecified Condition
3 ± 510 kW or higher
3 ± 5Below 1 W
(Apply battery voltage to terminals 1 and 2)
NG Replace starter relay.
OK
Page 708 of 4323

A23563
Wire Harness Side
Park/Neutral position switch ConnectorN1
A21559
Engine Room R/B No.2
Starter Relay
DI±506
± DIAGNOSTICSENGINE
700 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check for open and short in harness and connector between park/neutral posi-
tion switch and starter relay.
(a) Check the harness and the connector between the park/
neutral position switch connector and the starter relay.
(1) Disconnect the park/neutral position switch con-
nector.
(2) Remove the starter relay from the engine room R/B.
(3) Check for resistance between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
Park/Neutral position switch (N1±6) ± Starter relay (1)Below 1 W
Standard (Check for short):
Symbols (Terminal No.)Specified condition
Park/Neutral position switch (N1±6) or Starter relay (1)
± Body ground10 kW or higher
(b) Check the harness and the connector between the starter
relay and the body ground.
(1) Remove the starter relay from the engine room R/B.
(2) Check for resistance between the starter relay and
the body ground.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
Starter relay (2) ± Body groundBelow 1 W
NG Repair or replace harness or connector.
OK
Page 709 of 4323
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
Page 710 of 4323
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).
Page 711 of 4323
± 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
Page 712 of 4323
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