Infiniti G20 (P11). Manual — part 300
8
CHECK FUEL PUMP RELAY-2
Refer to “Component Inspection”, EC-613.
OK or NG
OK
©
GO TO 15.
NG
©
Repair or replace fuel pump relay-2.
9
CHECK POWER GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump harness connector.
SEF299WA
3. Check harness continuity between fuel pump terminal 2 and body ground, fuel pump terminal 1 and fuel pump relay-1
terminal 5.
AEC758
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 11.
NG
©
GO TO 10.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FUEL PUMP
Diagnostic Procedure (Cont’d)
EC-611
10
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M74, B102
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-1
©
Repair open circuit or short to ground or short to power in harness or connectors.
11
CHECK OUTPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 21 and fuel pump relay-1 connector terminal 2.
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 13.
NG
©
GO TO 12.
12
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M49, F23
I
Harness for open or short between ECM and fuel pump relay-1
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
13
CHECK FUEL PUMP RELAY-1
Refer to “Component Inspection”, EC-613.
OK or NG
OK
©
GO TO 14.
NG
©
Replace fuel pump relay-1.
14
CHECK FUEL PUMP
Refer to “Component Inspection”, EC-613.
OK or NG
OK
©
GO TO 15.
NG
©
Replace fuel pump.
15
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-146.
©
INSPECTION END
FUEL PUMP
Diagnostic Procedure (Cont’d)
EC-612
SEF511P
Component Inspection
=NCEC0449
FUEL PUMP RELAY-1 AND -2
NCEC0449S01
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.
SEF326W
FUEL PUMP
NCEC0449S02
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.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FUEL PUMP
Component Inspection
EC-613
Power steering oil pressure
switch harness connector
RH strut tower
SEF327W
Component Description
NCEC0451
The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the IACV-AAC valve to increase the idle speed and
adjust for the increased load.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0452
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
PW/ST SIGNAL
I
Engine: After warming up, idle
the engine
Steering wheel in neutral position
(forward direction)
OFF
The steering wheel is fully turned
ON
ECM Terminals and Reference Value
NCEC0453
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
46
SB
Power steering oil pressure
switch
[Engine is running]
I
Steering wheel is fully turned
Approximately 0V
[Engine is running]
I
Steering wheel is not turned
Approximately 5V
POWER STEERING OIL PRESSURE SWITCH
Component Description
EC-614
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