Nissan Frontier D22. Instruction — part 655
START SIGNAL
EC-1723
[VG33ER]
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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 the ECM terminals, such as the ground.
Diagnostic Procedure
UBS00E2T
1.
INSPECTION START
Do you have CONSULT-II?
Yes or No
Yes
>> GO TO 2.
No
>> GO TO 3.
2.
CHECK OVERALL FUNCTION
With CONSULT-II
1.
Turn ignition switch ON.
2.
Check “START SIGNAL” in “DATA MONITOR” mode with CON-
SULT-II under the following conditions.
OK or NG
OK
>> INSPECTION END.
NG
>> GO TO 4.
3.
CHECK OVERALL FUNCTION
Without CONSULT-II
Check voltage between ECM terminal 20 and ground under the fol-
lowing conditions.
OK or NG
OK
>> INSPECTION END.
NG
>> GO TO 4.
4.
CHECK STARTING SYSTEM
Turn ignition switch OFF, then turn it to START.
Does starter motor operate?
Yes or No
Yes
>> GO TO 5.
No
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
20
L/OR
Start signal
[Ignition switch: ON]
Approximately 0V
[Ignition switch: START]
BATTERY VOLTAGE
(11 - 14V)
Condition
“START SIGNAL”
Ignition switch ON
OFF
Ignition switch START
ON
PBIB0182E
Condition
Voltage
Ignition switch START
Battery voltage
Other positions
Approx. 0V
SEF733U
EC-1724
[VG33ER]
START SIGNAL
5.
CHECK FUSE
1.
Turn ignition switch OFF.
2.
Disconnect 7.5A fuse.
3.
Check if 7.5A fuse is OK.
OK or NG
OK
>> GO TO 6.
NG
>> Replace 7.5A fuse.
6.
CHECK START SIGNAL INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 20 and fuse block. Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M81, F36
●
Harness for open or short between ECM and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK INTERMITTENT INCIDENT
EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END.
Continuity should exist.
FUEL PUMP CIRCUIT
EC-1725
[VG33ER]
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EC
FUEL PUMP CIRCUIT
PFP:17042
Description
UBS00E2U
SYSTEM DESCRIPTION
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
startability. If the ECM receives a 120
° signal from the camshaft position sensor, it knows that the engine is
rotating, and causes the pump to operate. If the 120
° signal is not received when the ignition switch is ON, the
engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The
ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the
fuel pump.
COMPONENT DESCRIPTION
The fuel pump with a fuel damper is an in-tank type (the pump and
damper are located in the fuel tank).
CONSULT-II Reference Value in Data Monitor Mode
UBS00E2V
Specification data are reference values.
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed
Fuel pump
control
Fuel pump relay
Ignition switch
Start signal
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 5 seconds
Engine running and cranking
Operates
When engine is stopped
Stops in 1.5 seconds
Except as shown above
Stops
SEF018S
MONITOR ITEM
CONDITION
SPECIFICATION
FUEL PUMP RLY
●
Ignition switch is turned to ON. (Operates for 5 seconds.)
●
Engine running or cranking
ON
●
Except as shown above
OFF
EC-1726
[VG33ER]
FUEL PUMP CIRCUIT
Wiring Diagram
UBS00E2W
BBWA1098E
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