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DI-928
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDSH-01
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.
ACC Cut
ST Relay Relay
Ignition
STSW SW
ACC
ACCR Park/Neutral ST2
Position SW
P
STAR N ACCR
Starter
(NE) ECM
Battery STAR STSW
Engine Speed
A19655 A20059
DI-929
DIAGNOSTICS - ENGINE (2UZ-FE)
WIRING DIAGRAM
Access Cab, Standard Cab:
ECM
J12 A22
J/C J/C ACC Cut Relay
22 5 17
V-W V-W G
J26 J27 E3 ACCR
C C 2 1
I23 Ignition SW
V-W AM1 ACC L-R L-O
2 3 3 4
Driver Side J/B
2 3 STA 6 15 12
W AM2 ST2 B-W
Engine Room R/B
R-L R-L
1I 1F IE1 E5 STSW
2 7 8
ECU-B
W-R
G-Y
1 8
L-R
E6 NSW
2
J27 25 17 J27 J27 27 J27 29
11
J/C
7 IA9 8 IA9 E5 STA
B
J26 8 34 J26 J26 10 J26 12
W W-R G-Y G-Y G-R
4 P1
2 2 2 2 2 2 P Park/Neutral
Engine Room R/B
Position SW
3 2 N
2 2 2 2
ST Relay
Short Pin
5
Engine Room R/B
AM2
AM1
ST3
G-R G-R P
W-B P
1 1 1 1 5 1
2 3
140A ALT
(*1) 2 2 ST T13
TVIP
120A ALT
(*2) SRLT ECU
1 8 A J28 A J28
B-W
2 J/C
6 EB2 E J29
B-L
(*1) P
B-W A
B J23
(*2) J/C
1 S2 1
B-L A
S1 Starter
W-B
Battery
IE
*1: Towing Package
*2: Except Towing Package
A23596
DI-930
DIAGNOSTICS - ENGINE (2UZ-FE)
Double Cab:
Driver Side J/B Sub J/B No. 4 Sub J/B No. 3
3 2 W-R 9 19 W-R 10 10
1J 1E 4A 4A 3D 3C
W-R
A22 ECM
ACC Cut Relay 17
I23 Ignition SW R
E3 ACCR
2 1
AM1 ACC P G
1 3 3 4
W-L Driver Side J/B
STA
B-W 5 8 B-W
1C 6 1C 1J 2 2
5 AM2 ST2 4
Driver Side J/B
1 2
2 Engine Room R/B
AM1
B
1
W-R W-R 8 15 12
B R-L
1L 1 IJ4 IE1 E5 STSW
Driver Side J/B
3 1C 4
P P
B-R IJ4
E J29
7 1J
2 2 J/C
Engine Room R/B
W W-R
5 1
A J28 A J28
ST Relay
2C 1 2E 3 2C 8
11
P P
Short Pin ECU-B
E5 STA
Engine Room J/B
AM2
5
ST
3 2 P1
P Park/Neutral
2 2 N Position SW
4 L-R 8
B-W E6 NSW
2D 1
6 EB2 W-B
2 10 B
F13 B-W A
ALT FL J34
Block J/C
1 S2 1
12 B B-L A
S1
W-B
Battery Starter EA
A23597
DI-931
DIAGNOSTICS - ENGINE (2UZ-FE)
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-430).
NG
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 Position ON START
STARTER SIG OFF ON
NG Go to step 5.
OK
DI-932
DIAGNOSTICS - ENGINE (2UZ-FE)
3 Check voltage between terminal STAR, STSW and E1 of ECM connector.
CHECK:
Measure the voltage between the terminals of the E5 ECM con-
E5 E1 (-)
nectors, while cranking the engine (ignition switch START posi-
tion).
OK:
Standard:
Tester Connection Specified Condition
STSW(+) STA (+) STA (E5-11) - E1 (E5-1) 9 to 14 V
B17411
STSW (E5-12) - E1 (E5-1) 9 to 14 V
RESULT:
Terminal STAR Terminal STSW Proceed to
9 to 14 V 9 to 14 V A
0V 9 to 14 V B
0V 0V C
B Replace ECM (See page SF-82).
C Go to step 9.
A
DI-933
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check park/neutral position switch.
Component Side:
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 range Terminal No. to continuity
P 1-3 6-9
R 2-3 -
D14154
N 3-5 6-9
D 3-7 -
2 3-4 -
L 3-8 -
OK:
Below 1
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 Connection Specified Condition
3-5 10 k or higher
Below 1
3-5
(Apply battery voltage to terminals 1 and 2)
A19288 NG Replace starter relay.
OK
DI-934
DIAGNOSTICS - ENGINE (2UZ-FE)
6 Check for open and short in harness and connector between park/neutral posi-
tion switch and starter relay.
Wire Harness Side
(a) Check the harness and the connector between the park/
neutral position switch connector and the starter relay.
P1 (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):
Park/Neutral position switch Connector
A23563 Symbols (Terminal No.) Specified condition
Park/Neutral position switch (P1-6) - Starter relay (1) Below 1
Standard (Check for short):
Symbols (Terminal No.) Specified condition
Park/Neutral position switch (P1-6) or Starter relay (1)
10 k or higher
- Body ground
Engine Room R/B No.2 (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 Starter relay (2) - Body ground Below 1
A21559
NG Repair or replace harness or connector.
OK
DI-935
DIAGNOSTICS - ENGINE (2UZ-FE)
7 Check engine room R/B No.2 (Starter relay voltage).
Engine Room R/B No.2 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:
Starter Relay
Tester Connection Specified Condition
A21559
Starter relay (5) - Body ground 9 to 14 V
NG Check and repair harness and connector be-
tween starter relay and battery.
OK
8 Check starter (See page ST-18).
NG Repair or replace starter.
OK
DI-936
DIAGNOSTICS - ENGINE (2UZ-FE)
9 Check ignition switch.
PREPARATION:
(a) Remove the lower finish panel.
ACC
ON (b) Disconnect the ignition switch connector.
LOCK CHECK:
Check resistance between terminals.
OK:
START
Standard:
Switch Position Terminal Condition Specified Condition
I08467
LOCK Always 10 k or more
ACC 1-3 Below 1
1-2-3
ON Below 1
5-6
1-2
START Below 1
4-5-6
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-30).
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