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DTC P0480 RADIATOR COOLING FAN CONTROL SYSTEM MALFUNCTION
WIRING DIAGRAM / CIRCUIT DESCRIPTION
BATT
80A
BLK BLU/WHT
C42 (31P)
9
8
7
6
5
4
3
21
20
19
18
17
16
15
14
13
31
30
29
28 27
26
25
1. Main relay
2. Radiator fan relay
3. Radiator fan motor
NOTE:
For TYPE A and TYPE B, refer to NOTE in "ECM VOLTAGE VALUES TABLE" for applicable model.
DTC DETECTING CONDITION
Low voltage at terminal C41-18 when engine coolant
temp. is below 97.5°C, 207.5°F.
✱2 driving cycle detection logic, continuous monitoring.
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Warm up engine until radiator cooling fan starts to operate.
4) Check pending DTC in "ON BOARD TEST" or "PENDING DTC" mode and DTC in "DTC" mode.
INSPECTION
Step
1
Was "ENGINE DIAG. FLOW TABLE" performed?
2
Check Radiator Cooling Fan Relay and Its Circuit.
1) Turn ignition switch ON.
2) Check for voltage at terminal C41-18 of ECM
connector connected, under following condition.
See Fig. 1.
When engine coolant temp. is lower than
97.5°C, 207.5°F and A/C switch turns OFF : 10
– 14 V
Is voltage as specified?
30A
15A
BLK/YEL
1
BRN/WHT
BLK/RED
BLU/WHT
C41 (24P)
2
1
7
6
5
4
3
2
12
11
10
16
15
14
13 12
11
10
9
24
23
22
24
23
22
21
20
19
18
[A] : Case of TYPE A is shown (See NOTE)
[B] : Case of TYPE B is shown (See NOTE)
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-101
2
No.1
BLU
BLU/RED
BLU/RED
2
L
H
L–
BLU/BLK
No.2
H–
PPL/YEL
BLU
2
No.3
G02 (17P)
1
6
5
4
3
2
1
8
12
11
10
9
8
7
17
17
16
15
14
13
• "BLK/RED" or "BLU" circuit open or short
• Radiator cooling fan relay malfunction
• ECM malfunction
Yes
Go to Step 2.
Intermittent trouble or
faulty ECM.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
C41-18
3
BLK
PPL/YEL [A]
G02-3 [A]
C41-9 [B]
GRN/RED [B]
C42-1
BLK/ORN
BLK/ORN
C42-3
POSSIBLE CAUSE
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
ECM
No
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