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DI-414
DIAGNOSTICS - ENGINE (1GR-FE)
DIDUF-01

Fuel Pump Control Circuit

CIRCUIT DESCRIPTION
Refer to DTC P0230 on page DI-174.
WIRING DIAGRAM
Refer to DTC P0230 on page DI-174.

INSPECTION PROCEDURE

1 Check fuel pump operation (See page SF-5).

OK Go to step 8.

2 Connect hand-held tester, and check operation of fuel pump relay.

PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand-held tester main switch ON.
(c) Enter the following menu: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
CHECK:
Check the operation of the fuel pump relay when it is switched ON and OFF by the hand-held tester.
OK:
Operating noise can be heard from the fuel pump relay.

OK Go to step 4.

NG
DI-415
DIAGNOSTICS - ENGINE (1GR-FE)

3 Check fuel pump relay.

PREPARATION:
Remove the fuel pump relay from the engine room R/B.
CHECK:
Inspect the fuel pump relay.
OK:
Terminal No. Condition Specified Condition
Apply B+ between
3-4 10 K or higher
terminals 1 and 2
A21024 3-4 Always Below 1
3-5 Always 10 K or higher
Apply B+ between
3-5 Below 1
terminals 1 and 2

NG Replace fuel pump relay.

4 Check fuel pump (See page SF-13).

NG Repair or replace fuel pump.

5 Check circuit opening relay.

PREPARATION:
Remove the C/OPN relay from the engine room J/B.
CHECK:
Inspect the C/OPN relay.
OK:
Standard:
Terminal No. Condition Specified Condition
3-5 Always 10 K or higher
A19288
Apply B+ between
3-5 Below 1
terminals 1 and 2

NG Replace circuit opening relay.

OK
DI-416
DIAGNOSTICS - ENGINE (1GR-FE)

6 Check for open in harness and connector between EFI relay and fuel pump, and
fuel pump and body ground (See page IN-30).

NG Repair or replace harness or connector.

7 Check voltage between terminal FC and E1 of ECM connector.

PREPARATION:
Turn the ignition switch to ON.
E3 CHECK:
Measure the voltage between terminal FC of the ECM connec-
tor and body ground.
OK:
Voltage: 9 to 14 V

FC (+)
B17411 NG Check for open in harness and connector be-
tween battery and FC terminal of ECM (See page
SF-66).

Proceed to problem symptoms table
(See page DI-33).

8 Check fuel pump resistor (See page SF-57).

NG Replace fuel pump resistor.

Check and repair harness and connector between fuel pump relay and fuel pump resistor, and
fuel pump resistor and fuel pump (See page IN-30).

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