NISSAN PRIMERA 1999 Electronic Repair Manual

COMPONENT INSPECTION
Control sleeve position sensor
1. Disconnect electronic injection pump harness connector.
2. Check continuity between terminals
p1andp3,p2and
p3.
Resistance: Approximately 6.0W[at 25ÉC (77ÉF)]
If NG, take proper action.
NEF680 Control sleeve posi-
tion sensor, electric
governor & fuel
temperature sensor
connector
TROUBLE DIAGNOSIS 4CD20T
Control Sleeve Position Sensor (CSPS)
(Cont'd)
EC-77

Electric Governor
The electric governor is built into the fuel injection pump. It
moves the control sleeve to increase or decrease the amount of
fuel injected.
When current flows through the coil, a magnetic force is
produced, rotating the rotor. The rotor shaft is installed to the
control sleeve via a ball pin which is eccentrically situated in
relation to the rotor shaft. With this arrangement, the control
sleeve can be moved in relation to rotor rotation.
The rotor's rotating angle is determined by a balanced condition
of magnetic force (generated by current flow regulated by means
of the ECM) and tension of return spring (installed to rotor). The
larger the current flow through the coil, the greater the rotor's
rotating angle. This means that the control sleeve moves to the
right, increasing the amount of fuel injected.
The ECM regulates the current flow through the coil by chang-
ing the duty cycle ratio which controls the ON-OFF operation of
the electric governor grounding circuit.
Malfunction is detected when ....Check Items
(Possible cause)
lFuel injection feedback system does not operate properly.
[This system consists essentially of ECM, electric governor
and control sleeve position sensor.]lMain power supply circuit (ECM connector terminals107,
108,109) and fuse
lHarness or connectors
(Electric governor and control sleeve position sensor cir-
cuit)
lElectric governor
lECM
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position and select ªDATA
MONITORº mode with CONSULT-II.
2) Start engine above 1,200 rpm.
3) Run it for 2 seconds above 1,200 rpm. Return engine
speed to idle.
NOTE:
If malfunction occurs intermittently, conduct suitable driv-
ing pattern for 10 minutes. This makes it possible to deter-
mine the diagnostic trouble.
SEF632S Return spring
Coil
Rotor
Core
Shaft
Ball pin
Decrease Increase
Control sleeve
SEF633S Magnet
Core
Rotor
Coil
TROUBLE DIAGNOSIS 5CD20T
EC-78

YEC803
BATTERY
Refer to EL-POWER.
ENGINE
CONTROL
MODULE
RELAY: Detectable line for DTC
: Non-detectable line for DTC
INJECTION PUMP
(ELECTRIC GOVER-
NOR)
ECM
TROUBLE DIAGNOSIS 5CD20T
Electric Governor (Cont'd)
EC-79

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK MAIN POWER SUPPLY.
Refer to EC-CD-59.
CHECK POWER SUPPLY CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect ECM harness connector
and electronic injection pump har-
ness connector.
3. Check harness continuity between
injection pump connector terminal
p7and ECM connector terminals
107,108,109.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or con-
nectors.
CHECK GROUND CIRCUIT.
Check harness continuity between
injection pump connector terminal
p4
and ECM connector terminals101,
102,103.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or con-
nectors.
CHECK COMPONENT
(Electric governor).
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
ENG
Have the injection pump
assembly serviced by an
authorised service repre-
sentative.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
NEF800
.Electronic injection pump harness
connector (Electric governor)
NEF199A
Injection pump
connector
NEF200A
Injection pump
connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 5CD20T
Electric Governor (Cont'd)
EC-80

COMPONENT INSPECTION
Electric governor
1. Disconnect electronic injection pump harness connector.
2. Check continuity between injection pump connector termi-
nals
p4andp7.
Resistance: Approximately 1.0W[at 25ÉC (77ÉF)]
If NG, replace.
YEC361 Electronic injection pump
harness connector
TROUBLE DIAGNOSIS 5CD20T
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)
lInjection timing feedback system does not operate prop-
erly. (This system consists essentially of ECM, injection
timing control valve and needle lift sensor.)lHarness or connectors
[Injection timing control valve, needle lift sensor, crankshaft
position sensor (TDC) circuits]
lInjection timing control valve
lNeedle lift sensor
lCrankshaft position sensor (TDC)
lAir in fuel line
lInjection timing control valve circuit it open or shorted.lHarness or connectors
(The Injection timing control valve is open or shorted.)
lInjection timing control valve
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE FOR INJECTION TIMING CONTROL
SYSTEM
1) Turn ignition switch to ªONº position and select ªDATA
MONITORº 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 ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 2 seconds.
SEF638S Timer piston
High
pres-
sureLow
pressure
Fuel injection timing
control valve
TROUBLE DIAGNOSIS 6CD20T
EC-82

YEC804
BATTERY
Refer to EL-POWER.
: Detectable line for DTC
: Non-detectable line for DTC
ENGINE
CONTROL
MODULE
RELAYINJECTION PUMP (INJEC-
TION TIMING CONTROL
VA LV E )
ECM
TROUBLE DIAGNOSIS 6CD20T
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 ªDIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCE-
DUREº.
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect injection timing control
valve harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between injection tim-
ing control valve connector terminal
p3and ground with CONSULT-II or
tester.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness connectors
E89,F96
lElectronic injection
pump harness connec-
tor
F49
l15A fuse
lHarness 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 ªLOCKº posi-
tion.
2. Disconnect ECM harness connector.
3. Check harness continuity between
injection timing control valve connec-
tor terminal
p2and ECM terminals
202.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lElectronic injection
pump harness connec-
tor
F49
lHarness for open or
short-circuit between
injection timing control
valve and ECM.
If NG, repair harness or
connectors.
pA
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 6CD20T
Injection Timing Control Valve (Cont'd)
EC-84

pA
CHECK COMPONENT
(Injection timing control valve).
Refer to ªCOMPONENT INSPECTIONº
below.
OK
ENG
Replace injection timing
control valve.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
COMPONENT INSPECTION
Injection timing control valve
1. Disconnect injection timing control valve harness connector.
2. Check resistance between terminals
p2andp3.
Resistance: Approximately 15W[at 25ÉC (77ÉF)]
If NG, replace injection timing control valve.
YEC364 Injection timing
control valve
H
H
H
H
TROUBLE DIAGNOSIS 6CD20T
Injection Timing Control Valve (Cont'd)
EC-85

Engine Control Module (ECM)
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The module monitors and
controls the engine operation.
Malfunction is detected when ....Check Item
(Possible Cause)
lECM calculation function is malfunctioning.lECM *
lAn excessively high or low voltage from the atmospheric
pressure sensor is detected by the ECM.lECM *
lECM reference voltage (2.5V) is excessively high or low.lECM *
lECM version number or switching function is not plausible.lECM *
lIgnition switch ªONº signal evaluation circuit in ECM is
malfunctioning.lECM *
* Actually inspecting the ECM inside circuit is impossible. Then, ECM may be replaced.
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 2 seconds.
SEC220B
TROUBLE DIAGNOSIS 7CD20T
EC-86