TROUBLESHOOTING
ENGINE COOLING
14-8
Q: Are the harness wires between fan control relay
connector A-09X terminal 3 and earth damaged?
YES : Repair or replace them, then go to Step 13.
NO : Go to Step 7.
STEP 7. Check the cooling fan motor.
Refer to P.14-17.
Q: Is the cooling fan motor in good condition?
YES : Go to Step 8.
NO : Replace it, then go to Step 13.
STEP 8. Check the circuit at fan controller
connector A-17 terminal 1.
AC210859
Connector: A-17
A-17 (GR)
AD
Fan controller
Component side
(1) Disconnect fan controller connector A-17, and
measure at the harness side connector.
(2) Measure the resistance between terminal No.1
and earth.
• The resistance should measure less than 2
ohms.
Q: Is the resistance less than 2 ohms?
YES : Go to Step 10.
NO : Go to Step 9.
STEP 9. Check the harness wire between fan
controller connector A-17 and earth.
AC210859
Connector: A-17
A-17 (GR)
AD
Fan controller
Component side
Q: Are the harness wires between fan controller
connector A-17 and earth damaged?
YES : Repair or replace them, then go to Step 13.
NO : Go to Step 10.
STEP 10. Measure the output circuit voltage at
engine-ECU connector C-121 terminal 18 by
backprobing.
AC505254
16
25
10
24
1
9
24
27
13
26
11
3
12
2829
1415
3031
1718
3332
6
20
5
19 21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <LHD>
Harness side
C-121 (GR)
Engine-ECU
AC505255
16
25
10
24
1
9
24
27
13
26
11
3
12
2829
1415
3031
1718
3332
6
20
5
19 21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <RHD>
Harness side
C-121 (GR)
Engine-ECU
(1) Do not disconnect engine-ECU connector C-121.
(2) Start the engine and allow it to idle.
(3) Turn the A/C switch to the "ON" position.
(4) Measure the voltage between terminal No.18 and
earth by backprobing.
• The voltage should measure 0.7 volt or more
when the cooling fan is operating.
Q: Is the voltage 0.7 volt or more when the cooling fan
is operating?
YES : Go to Step 12.
NO : Go to Step 11.
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