Nissan Primera P11. Manual — part 94
COMPONENT INSPECTION
Electric governor
1. Disconnect electronic injection pump harness connector.
2. Check continuity between injection pump connector termi-
nals
p
4
and
p
7
.
Resistance: Approximately 1.0
Ω
[at 25°C (77°F)]
If NG, replace.
YEC361
Electronic injection pump
harness connector
TROUBLE DIAGNOSIS 5
CD20T
Electric Governor (Cont’d)
EC-81
Injection Timing Control Valve
The injection timing control valve is built into the fuel injection
pump. It controls the timer piston to change the fuel injection
timing.
The timing control valve is a solenoid valve located in the line
between high-pressure chamber and low-pressure chamber. It
changes fuel pressure in the high-pressure chamber.
When current flows through the solenoid (the solenoid turns ON),
the timing control valve opens, advancing fuel injection timing.
When current does not flow through it, the timing control valve
closes, retarding injection timing.
The ECM emits an ON-OFF duty cycle signal. The longer the
OFF-duration, the greater the advance angle. The longer the
ON-duration, the greater the retard angle. This means that
changing the ON-OFF duty cycle ratio makes it possible to
achieve an optimal advance angle and accurately control fuel
injection timing.
Malfunction is detected when .
Check Items
(Possible cause)
●
Injection timing feedback system does not operate prop-
erly. (This system consists essentially of ECM, injection
timing control valve and needle lift sensor.)
●
Harness or connectors
[Injection timing control valve, needle lift sensor, crankshaft
position sensor (TDC) circuits]
●
Injection timing control valve
●
Needle lift sensor
●
Crankshaft position sensor (TDC)
●
Air in fuel line
●
Injection timing control valve circuit it open or shorted.
●
Harness or connectors
(The Injection timing control valve is open or shorted.)
●
Injection timing control valve
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE FOR INJECTION TIMING CONTROL
SYSTEM
1)
Turn ignition switch to “ON” position and select “DATA
MONITOR” mode with CONSULT-II.
2)
Start engine. Run engine for 10 seconds at idle.
NOTE:
If malfunction occurs intermittently, conduct suitable driv-
ing pattern for 10 minutes. This makes it possible to deter-
mine the diagnostic trouble.
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE FOR INJECTION TIMING CONTROL
VALVE CIRCUIT
1)
Turn ignition switch to “ON” position.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 2 seconds.
SEF638S
Timer piston
High
pres-
sure
Low
pressure
Fuel injection timing
control valve
TROUBLE DIAGNOSIS 6
CD20T
EC-82
YEC804
BATTERY
Refer to EL-POWER.
: Detectable line for DTC
: Non-detectable line for DTC
ENGINE
CONTROL
MODULE
RELAY
INJECTION PUMP (INJEC-
TION TIMING CONTROL
VALVE)
ECM
TROUBLE DIAGNOSIS 6
CD20T
Injection Timing Control Valve (Cont’d)
EC-83
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK FOR AIR IN FUEL FILTER.
1. Move priming pump up and down to
purge air from fuel filter.
2. Perform “DIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCE-
DURE”.
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” posi-
tion.
2. Disconnect injection timing control
valve harness connector.
3. Turn ignition switch to “ON” position.
4. Check voltage between injection tim-
ing control valve connector terminal
p
3
and ground with CONSULT-II or
tester.
Voltage: Battery voltage
OK
E
NG
Check the following:
●
Harness connectors
E89
,
F96
●
Electronic injection
pump harness connec-
tor
F49
●
15A fuse
●
Harness for open or
short-circuit between
injection timing control
valve harness connec-
tor and ECM relay.
If NG, repair harness or
connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” posi-
tion.
2. Disconnect ECM harness connector.
3. Check harness continuity between
injection timing control valve connec-
tor terminal
p
2
and ECM terminals
202
.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
E
NG
Check the following:
●
Electronic injection
pump harness connec-
tor
F49
●
Harness for open or
short-circuit between
injection timing control
valve and ECM.
If NG, repair harness or
connectors.
p
A
SEF671S
Priming pump
NEF804
Fuel injection timing
control valve harness
connector
NEF201A
Injection timing control
valve harness connector
NEF202A
Injection timing control
valve harness connector
H
H
H
H
TROUBLE DIAGNOSIS 6
CD20T
Injection Timing Control Valve (Cont’d)
EC-84
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