DIAGNOSTICS SECTION.pdf

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2-5
[T100]
1. Wiring Diagram
ENGINE COOLING SYSTEM
1. Wiring Diagram
SU14-01
2
ENGINE COOLING SYSTEM
[T2A3]
2-5
2. Radiator Main Fan
2. Radiator Main Fan
A: OPERATION
DETECTING CONDITION:
Condition:
¼
Engine coolant temperature is above 95°C
(203°F).
¼
Vehicle speed is below 19 km/h (12 MPH).
TROUBLE SYMPTOM:
¼
Radiator main fan does not rotate under the
above conditions.
2A1 :
CHECK POWER SUPPLY TO MAIN
FAN MOTOR.
2A2 :
CHECK GROUND CIRCUIT OF MAIN
FAN MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between main fan motor
connector and chassis ground.
Connector & terminal
(F17) No. 1 — Chassis ground:
CAUTION:
Be careful not to overheat engine during repair.
1) Turn ignition switch to OFF.
2) Disconnect connector from main fan motor.
3) Start the engine, and warm it up until engine
coolant temperature increases over 95°C (203°F).
4) Stop the engine and turn ignition switch to ON.
5) Measure voltage between main fan motor con-
nector and chassis ground.
H2M1715B
Connector & terminal
(F17) No. 2 (+) — Chassis ground (−):
:
Is the resistance less than 5
Ω
?
: Go to step
2A3.
: Repair open circuit in harness between
main fan motor connector and chassis
ground.
2A3 :
CHECK POOR CONTACT.
Check poor contact in main fan motor connector.
<Ref. to FOREWORD [T3C1].>
:
Is there poor contact in main fan
motor connector?
: Repair poor contact in main fan motor
connector.
: Go to step
2A4.
H2M1709A
:
Is the voltage more than 10 V?
: Go to step
2A2.
: Go to step
2A5.
3
2-5
[T2A4]
2. Radiator Main Fan
ENGINE COOLING SYSTEM
2A4 :
CHECK MAIN FAN MOTOR.
2A6 :
CHECK POWER SUPPLY TO MAIN
FAN RELAY.
Connect battery positive (+) terminal to terminal
No. 2, and negative (−) terminal to terminal No. 1
of main fan motor connector.
1) Turn ignition switch to ON.
2) Measure voltage between main fan relay termi-
nal and chassis ground.
Connector & terminal
(F66) No. 28 (+) — Chassis ground (−):
S2M0436A
:
Does the main fan rotate?
: Repair poor contact in main fan motor
connector.
: Replace main fan motor with a new one.
2A5 :
CHECK POWER SUPPLY TO MAIN
FAN RELAY.
2A7 :
1) Turn ignition switch to OFF.
2) Remove main fan relay from A/C relay holder.
3) Measure voltage between main fan relay termi-
nal and chassis ground.
S2M0438A
:
Is the voltage more than 10 V?
: Go to step
2A16.
: Go to step
2A12.
CHECK 20 A FUSE.
1) Remove 20 A fuse from A/C relay holder.
2) Check condition of fuse.
Connector & terminal
(F66) No. 26 (+) — Chassis ground (−):
S2M0439A
S2M0437A
:
Is the voltage more than 10 V?
: Go to step
2A6.
: Go to step
2A7.
:
Is the fuse blown-out?
: Replace fuse.
: Go to step
2A8.
4
ENGINE COOLING SYSTEM
[T2A12]
2-5
2. Radiator Main Fan
2A8 :
CHECK HARNESS CONNECTOR
BETWEEN MAIN FUSE BOX AND A/C
RELAY HOLDER 20 A FUSE.
2A11 :
CHECK HARNESS CONNECTOR
BETWEEN 20 A FUSE AND MAIN
FAN RELAY IN A/C RELAY HOLDER.
1) Disconnect connector from main fuse box.
2) Disconnect connectors (F25) and (F26) from
generator, and (F34) from SBF holder.
3) Measure resistance of harness connector
between main fuse box connector and A/C relay
holder 20 A fuse terminal.
Measure resistance of harness between 20 A fuse
and main fan relay terminal.
Connector & terminal
(F27) No. 2 — (F66) No. 26:
Connector & terminal
(F35) No. 2 — (F27) No. 1:
S2M0441A
S2M0440A
:
Is the resistance less than 1
Ω
?
: Go to step
2A9.
: Repair open circuit in harness between
main fuse box connector and 20 A fuse
terminal.
2A9 :
CHECK POOR CONTACT.
:
Is the resistance less than 1
Ω
?
: Repair poor contact in main fan relay
connector.
: Repair open circuit in harness between
20 A fuse and main fan relay connector.
2A12 :
CHECK FUSE.
1) Turn ignition switch to OFF.
2) Remove fuse No. 18 from joint box.
3) Check condition of fuse.
Check poor contact in main fuse box connector.
<Ref. to FOREWORD [T3C1].>
:
Is there poor contact in main fuse
box connector?
: Repair poor contact in main fuse box
connector.
: Go to step
2A10.
2A10 :
CHECK POOR CONTACT.
:
Is the fuse blown-out?
: Replace fuse.
: Go to step
2A13.
S2M0442A
Check poor contact in A/C relay holder 20 A fuse
connector. <Ref. to FOREWORD [T3C1].>
:
Is there poor contact in A/C relay
holder 20 A fuse connector?
: Repair poor contact in 20 A fuse
: Go to step
2A11.
5
2-5
[T2A13]
2. Radiator Main Fan
ENGINE COOLING SYSTEM
2A13 :
CHECK HARNESS CONNECTOR
BETWEEN IGNITION SWITCH AND
JOINT BOX.
2A16 :
CHECK MAIN FAN RELAY.
1) Disconnect connector from ignition switch.
2) Separate connectors (F44) and (B61).
3) Disconnect connector (B159) from joint box.
4) Measure resistance of harness between igni-
tion switch connector and joint box.
1) Turn ignition switch to OFF.
2) Check continuity between main fan relay termi-
nals.
Connector & terminal
(B72) No. 4 — (B159) No. 8:
S2M0468A
:
Does no continuity exist between ter-
minals No. 25 and No. 26?
: Go to step
2A17.
: Replace main fan relay.
S2M0443A
:
Is the resistance less than 1
Ω
?
: Go to step
2A14.
: Repair harness and connector.
NOTE:
In this case, repair the following:
¼
Open circuit in harness between ignition switch
connector and joint box.
¼
Poor contact in coupling connector (B61).
2A14 :
CHECK POOR CONTACT.
2A17 :
CHECK MAIN FAN RELAY.
1) Connect battery to terminals No. 27 and No. 28
of main fan relay.
2) Check continuity between main fan relay termi-
nals.
Check poor contact in ignition switch connector.
<Ref. to FOREWORD [T3C1].>
:
Is there poor contact in ignition
switch connector?
: Repair poor contact in ignition switch
connector.
: Go to step
2A15.
2A15 :
CHECK POOR CONTACT.
S2M0469A
:
Does continuity exist between termi-
nals No. 25 and No. 26?
: Go to step
2A18.
: Replace main fan relay.
Check poor contact in joint box 10 A fuse connec-
tor. <Ref. to FOREWORD [T3C1].>
:
Is there poor contact in joint box 10 A
fuse connector?
: Repair poor contact in joint box connec-
tor.
: Go to step
2A16.
6

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