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Table B-2 Fuel Pump and Its Circuit Check
BLK/YEL
7
WHT/BLU
BLK/YEL
1
80A
60A 15A
C64
7
6
5
4
3
17
16
15
14
13
12
11
27
26
25
24
23
22
21
34
33
32
31
1. Relay/fuse box
4. Fuel pump relay
2. Main relay
5. Fuel pump
3. ECM
6. "IG" fuse
TROUBLESHOOTING
Step
1
Check fuel pump control system for operation.
See Fig. 1.
Is fuel pump heard to operate for 3 sec. after igni-
tion switch ON?
2
Check fuel pump relay power supply.
1) Disconnect fuel pump relay from relay/fuse
box with ignition switch turned OFF.
2) Check for proper connection to fuel pump relay
at each terminals.
3) If OK, turn ON ignition switch, measure voltage
between "BLK/WHT" wire terminal and engine
ground.
Is voltage 10 – 14 V?
3
Check fuel pump relay power supply.
1) Turn ON ignition switch, measure voltage
between "BLK/RED" wire terminal of fuel pump
relay connector and engine ground.
Is voltage 10 –14 V?
BLK/WHT
BLK/WHT
6
BLK/RED
2
BLK/YEL
BLK/YEL
C63
2
1
7
6
5
4
3
10
9
8
19
18
17
16
15
14
13
12
11
20
19
18
27
26
25
24
23
30
29
28
35
34
33
32
31
7. Ignition switch
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-171
BLK/WHT
4
GRN
PNK
5
BLK
BLK/RED
BLK/RED
BLK/RED
BRN/WHT
G91
2
1
6
5
4
3
10
9
8
16
15
14
13
12
11
10
9
22
21
20
27
26
25
24
23
22
21
20
30
29
28
35
34
33
32
31
Fuel pump circuit is in
good condition.
Go to Step 3.
Go to Step 4.
3
G91-28
C64-14
C63-1
BLK/ORN
C64-2
BLK
C64-1
BLK/ORN
G91-6
G91-5
C64-15
2
1
7
8
19
18
17
30
29
28
Yes
Go to Step 2.
"BLK/WHT" wire open
or shorted to ground
circuit.
"BLK/RED" wire open
circuit.
No
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