ENGINE AND EMISSION CONTROL SYSTEM
6E1-31
B-1 FUEL PUMP AND ITS CIRCUIT CHECK
1. ECM
2. Fuel pump relay
3. Fuel pump
4. Main relay
5. Ignition switch
STEP
ACTION
YES
NO
1
Is fuel pump heard to operate 2 se-
conds after ignition switch ON?
Fuel pump and its circuit are in good
condition.
Go to Step 2.
2
1) Remove fuel pump relay from relay
box with ignition switch OFF.
2) Connect two terminals (a and b) of
relay connector as shown in figure
using service wire.
Is fuel pump heard to operate with
ignition switch ON?
Go to Step 3.
“B/R” or “P” wire open,
poor fuel pump relay-
to-coupler connection
or faulty fuel pump.
3
1) Check fuel pump relay, referring to
p.6E1-68.
Is it in good condition?
Poor fuel pump relay-to-coupler con-
nection, “Br/B”, “B/W” wire open or
poor E32-318 connection.
If wire and connection are OK, substi-
tute a known-good ECM and recheck.
Faulty fuel pump relay.
Fig. for STEP 2
1. Fuel pump relay coupler
2. Service wire