Infiniti Q45. Manual — part 474
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
EC-535
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC Confirmation Procedure
NBS00222
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V with ignition
switch ON.
WITH CONSULT-II
1.
Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2.
Make sure that “COOLAN TEMP/S” indicates less than 70
°
C
(158
°
F). If not, cool down the engine.
3.
Start engine.
4.
Hold vehicle at the following conditions for 12 seconds.
5.
If 1st trip DTC is detected, go to
EC-537, "Diagnostic Procedure"
WITH GST
Follow the procedure WITH CONSULT-II above.
ENG SPEED
1,175 - 3,075 rpm
VHCL SPEED SE
More than 70 km/h (43 MPH)
B/FUEL SCHDL
2.0 - 31.7 msec
Selector lever
Suitable position
SEF189Y
EC-536
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
Wiring Diagram
NBS00223
TBWM1242E
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
EC-537
C
D
E
F
G
H
I
J
K
L
M
A
EC
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.
Diagnostic Procedure
NBS00224
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
38
G/R
Fuel pump control module
(FPCM) check
[When cranking engine]
Approximately 0V
[Engine is running]
●
Warm-up condition
●
Idle speed
4 - 6V
39
B/R
Fuel pump control module
(FPCM)
[When cranking engine]
0 - 0.5V
[Engine is running]
●
Warm-up condition
●
Idle speed
8 - 12V
113
GY
Fuel pump relay
[Ignition switch: ON]
●
For 5 seconds after turning ignition switch
ON
[Engine is running]
0 - 1.5V
[Ignition switch: ON]
●
More than 5 seconds after turning ignition
switch ON
BATTERY VOLTAGE
(11 - 14V)
PBIB2417E
EC-538
DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)
2.
CHECK FPCM POWER SUPPLY CIRCUIT
1.
Disconnect fuel pump control module (FPCM) harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between FPCM terminal 2 and ground with CON-
SULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M141, B211
●
Harness for open or short between FPCM and harness connector B211
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK FPCM GROUND CIRCUIT-I FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check harness continuity between FPCM terminal 3 and ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to power in harness or connectors.
Voltage: Battery voltage
PBIB0032E
PBIB0099E
Continuity should exist.
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