Nissan Silvia. Instruction — part 173

3

DETECT MALFUNCTIONING PART

Check the following.

I

15A fuse

I

Harness for open or short between fuse and fuel pump relay

©

Repair harness or connectors.

4

CHECK POWER GROUND CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect fuel pump harness connector.

SEC389C

3. Check harness continuity between fuel pump terminal 2 and body ground, fuel pump terminal 1 and fuel pump relay

terminal 5.
Refer to wiring diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.

OK or NG

OK

©

GO TO 6.

NG

©

GO TO 5.

5

DETECT MALFUNCTIONING PART

Check the following.

I

Harness connectors B24, T1

I

Harness for open or short between fuel pump and body ground

I

Harness for open or short between fuel pump and fuel pump relay

©

Repair open circuit or short to ground or short to power in harness or connectors.

6

CHECK OUTPUT SIGNAL CIRCUIT

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 106 and fuel pump relay connector terminal 1.

Refer to wiring diagram.

Continuity should exist.

3. Also check harness for short to ground and short to power.

OK or NG

OK

©

GO TO 8.

NG

©

GO TO 7.

GI

MA

EM

LC

FE

CL

MT

AT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

FUEL PUMP

Diagnostic Procedure (Cont’d)

EC-207

7

DETECT MALFUNCTIONING PART

Check the following.

I

Harness connectors B1, M8

I

Harness connectors M60, F4

I

Harness for open or short between ECM and fuel pump relay

NG

©

Repair open circuit or short to ground or short to power in harness or connectors.

8

CHECK FUEL PUMP RELAY

Refer to “Component Inspection”, EC-208.

OK or NG

OK

©

GO TO 9.

NG

©

Replace fuel pump relay.

9

CHECK FUEL PUMP

Refer to “Component Inspection”, EC-208.

OK or NG

OK

©

GO TO 10.

NG

©

Replace fuel pump.

10

CHECK INTERMITTENT INCIDENT

Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-82.

©

INSPECTION END

SEF511P

Component Inspection

NMEC0783

FUEL PUMP RELAY

NMEC0783S01

Check continuity between terminals 3 and 5.

Conditions

Continuity

12V direct current supply between terminals 1 and 2

Yes

No current supply

No

If NG, replace relay.

SEC390C

FUEL PUMP

NMEC0783S02

1.

Disconnect fuel pump harness connector.

2.

Check resistance between terminals 1 and 2.

Resistance: 0.2 - 5.0

Ω

[at 25°C (77°F)]

If NG, replace fuel pump.

FUEL PUMP

Diagnostic Procedure (Cont’d)

EC-208

SEC384C

Component Description

NMEC0784

When the air conditioner is on, the IACV-FICD solenoid valve sup-
plies additional air to adjust to the increased load.

ECM Terminals and Reference Value

NMEC0785

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

11

G

Air conditioner relay

[Engine is running]

I

Both A/C switch and blower fan switch are “ON”

0 - 1V

[Engine is running]

I

A/C switch is “OFF”

BATTERY VOLTAGE
(11 - 14V)

41

L/B

Air conditioner switch

[Engine is running]

I

Both A/C switch and blower fan switch are “ON”
(Compressor operates)

Approximately 0V

[Engine is running]

I

Air conditioner switch is “OFF”

Approximately 5V

GI

MA

EM

LC

FE

CL

MT

AT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

IACV-FICD SOLENOID VALVE

Component Description

EC-209

Wiring Diagram

NMEC0786

TEC816

IACV-FICD SOLENOID VALVE

Wiring Diagram

EC-210