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DI-145
DIAGNOSTICS - ENGINE (5VZ-FE)
DI0SI-14
Starter Signal Circuit
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after-starter injection control.
WIRING DIAGRAM
J/
Driver Side J/B
IG Switch
2 GAUGE 5 R-L
W 2 4 B-Y
1I 1E
G-B
W-R 7 8 1I 3
J2 B
W B-W
STA Driver Side J/B J/C
2 2 2 2
1F 6 J1 C
Engine Room R/B
2 5 1 B Center J/B
R-L
AM1
2 3E 2
1 AM2 1
2 EA1 1
1
ALT 3E
1 2 R-L
Starter 3 2
3E 3 G1
Relay 6 IG1
2 B
Generator IG
2 2 ECM
B-W 3 II1
B 9
3 EA1 3
W P1 B
B-W B-W E14 NSW
1 1 Position Switch
B-L S1 W-B
S2 Park/Neutral
7 STA
6 E14
Starter EB B-W B-W
9
Battery II1 E1
B-W
A15458
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the problem symptoms table on page DI-20 .
TOYOTA hand-held tester:
1 Connect TOYOTA hand-held tester, and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
2002 4RUNNER (RM887U)
Author : Date : 321
DI-146
DIAGNOSTICS - ENGINE (5VZ-FE)
CHECK:
Read the STA signal on the TOYOTA hand-held tester while the starter operates.
OK:
Ignition Switch Position ON START
STA Signal OFF ON
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-20 ).
NG
2 Check for open in harness and connector between ECM and starter relay (See
page DI-18 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28 ).
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
ON
Remove the glove compartment (See page SF-54 ).
CHECK:
Measure the voltage between terminal STA of the ECM connec-
tor and body ground during the engine cranking.
OK:
(-) (+)
Voltage: 6 V or more
STA
A07152 OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-20 ).
NG
2 Check for open in harness and connector between ECM and starter relay (See
page DI-18 ).
2002 4RUNNER (RM887U)
Author : Date : 322
DI-147
DIAGNOSTICS - ENGINE (5VZ-FE)
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28 ).
2002 4RUNNER (RM887U)
Author : Date : 323
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