1998 NISSAN PATROL Engine Control Workshop Manual

Inspection (No.2-4nozzles)
Thoroughly clean all disassembled parts with fresh kerosene or
solvent.
+If nozzle needle is damaged or fused, replace nozzle assem-
bly with a new one.
+If end of nozzle needle is seized or excessively discolored,
replace nozzle assembly.
+Check nozzle body and distance piece for proper contact. If
excessively worn or damaged, replace nozzle assembly or dis-
tance piece.
+Check distance piece and nozzle holder for proper contact. If
excessively worn or damaged, replace distance piece or nozzle
holder.
+Check nozzle spring for excessive wear or damage. If exces-
sively worn or damaged, replace it with a new spring.
Cleaning (No.2-4nozzles)
a. Do not touch the nozzle mating surface with your ®ngers.
b. To wash the nozzles, use a wooden stick and brass brush
with clean diesel fuel.
1. Remove any carbon from exterior of nozzle body (except wrap-
ping angle portion) by using Tool.
2. Clean oil sump of nozzle body using Tool.
3. Clean nozzle seat by using Tool.
This job should be performed with extra precautions, since
efficiency of nozzle depends greatly on a good nozzle seat.
SEF830
SEF831
SEF832
INJECTION NOZZLE
EC-23

4. Clean spray hole of nozzle body by using Tool.
To prevent spray hole from canting, always clean it by start-
ing with inner side and working towards outside.
5. Decarbonate nozzle needle tip by using Tool.
6. Check needle sinking.
(1) Pull needle about halfway out from body and then release it.
(2) Needle should sink into body very smoothly from just its own
weight.
(3) Repeat this test and rotate needle slightly each time.
If needle fails to sink smoothly from any position, replace both
needle and body as a unit.
Assembly (No.2-4nozzles)
Assemble in the reverse order of disassembly, observing the fol-
lowing.
If nozzle body is not installed properly, Tool cannot be
removed and nozzle body may be damaged.
Holder to nozzle nut:
: 78-98Nzm (8.0 - 10.0 kg-m, 58 - 72 ft-lb)
SEF833
SEF834
SEF835
SEF671A
INJECTION NOZZLE
Cleaning (No.2-4nozzles) (Cont'd)
EC-24

Test and Adjustment
WARNING:
When using nozzle tester, be careful not to allow diesel fuel
sprayed from nozzle to contact your hands or body, and make
sure your eyes are properly protected with goggles.
INJECTION PRESSURE TEST
1. Install nozzle to injection nozzle tester and bleed air from ¯are
nut.
2. Pump the tester handle slowly (one time per second) and watch
the pressure gauge.
3. Read the pressure gauge when the injection pressure just
starts dropping.
Initial injection pressure:
Used
14,220 kPa (142.2 bar, 145 kg/cm
2, 2,062 psi)
New
14,711 - 15,495 kPa (147.1 - 155.0 bar,
150 - 158 kg/cm
2, 2,133 - 2,247 psi)
Always check initial injection pressure using a new nozzle.
4. To adjust injection pressure, change adjusting shims (No. 2 - 4
nozzles).
a. Increasing the thickness of adjusting shims increases ini-
tial injection pressure. Decreasing thickness reduces ini-
tial pressure.
b. A shim thickness of 0.04 mm (0.0016 in) corresponds
approximately to a difference of 471 kPa (4.71 bar, 4.8
kg/cm
2, 68 psi) in initial injection pressure.
Refer to SDS for adjusting shim (EC-189).
LEAKAGE TEST
1. Maintain the pressure at about 981 to 1,961 kPa (9.8 to 19.6
bar, 10 to 20 kg/cm2, 142 to 284 psi) below initial injection
pressure.
2. Check that there is no dripping from the nozzle tip or around the
body.
EF791A
SEF672A
SEF673A
Adjusting shim
SEF674A
INJECTION NOZZLE
EC-25

3. If there is leakage, clean, overhaul or replace nozzle.
SPRAY PATTERN TEST
1. Check spray pattern by pumping tester handle one full stroke
per second.
+If main spray angle is within 30 degrees as shown, injec-
tion nozzle is good.
+It is still normal even if a thin stream of spray deviates from
the main spray (pattern B).
2. If the spray pattern is not correct, disassemble and clean
nozzle.
3. Test again and if spray pattern is not corrected, replace nozzle.
SEF079S
INJECTION NOZZLE
Test and Adjustment (Cont'd)
EC-26

Removal
1. Remove battery.
Disconnect electronic injection pump harness connectors.
2. Set No. 1 piston at TDC on its compression stroke.
TDC: Crankshaft pulley notch without painted mark
3. Remove fuel hoses (supply, return and spill) and injection
tubes.
4. Remove air duct and injection pump timing belt cover.
5. Remove injection pump timing belt.
Refer to EM section (``Injection Pump Timing Belt'').
6. Remove injection pump sprocket with Tool.
+Remove key from injection pump shaft and store safely.
SEF663V
SEF664V
SEF665V
ELECTRONIC FUEL INJECTION PUMP
EC-27

7. Remove injection pump assembly.
Installation
1. Install key on injection pump shaft, then install injection pump
sprocket.
+Use alignment mark on sprocket.
2. Install injection pump timing belt.
Refer to EM section (``Injection Pump Timing Belt'').
3. Adjust injection timing.
Refer to ``Basic Inspection'', EC-46.
4. Install all parts removed.
SEF666V
SEF667V
ELECTRONIC FUEL INJECTION PUMP
Removal (Cont'd)
EC-28

Disassembly and Assembly
CAUTION:
+Do not disassemble the parts not shown in the illustration
above.
+Before installing injection timing control valve, liberally
apply a coat of diesel fuel to O-ring and its mating area.
Insert injection timing control valve straight into bore in
fuel pump body. After properly positioning injection timing
control valve, visually check that fuel does not leak.
+After assembling the parts, erase Diagnostic Trouble Code
(DTC), and perform DTC CONFIRMATION PROCEDURE (or
OVERALL FUNCTION CHECK).
SEF668V
ELECTRONIC FUEL INJECTION PUMP
EC-29

DTC and MIL Detection Logic
When a malfunction is detected for the ®rst time, the malfunction (DTC) is stored in the ECM memory.
The MIL will light up each time the ECM detects malfunction. However, if the same malfunction is experienced
in two consecutive driving patterns and the engine is still running, the MIL will stay lit up. For diagnostic items
causing the MIL to light up, refer to ``DIAGNOSTIC TROUBLE CODE INDEX'', EC-1.
Diagnostic Trouble Code (DTC)
HOW TO READ DTC
The diagnostic trouble code can be read by the following methods.
1. The number of blinks of the malfunction indicator lamp in the Diagnostic Test Mode II (Self-Diagnostic
Results) Examples: 11, 13, 14, etc.
These DTCs are controlled by NISSAN.
2. CONSULT Examples: ``CAM POS SEN (PUMP)'', etc.
+Output of the trouble code means that the indicated circuit has a malfunction. However, in the Mode
II it does not indicate whether the malfunction is still occurring or occurred in the past and returned
to normal.
CONSULT can identify them. Therefore, using CONSULT (if available) is recommended.
HOW TO ERASE DTC
The diagnostic trouble code can be erased by the following methods.
Selecting ``ERASE'' in the ``SELF-DIAG RESULTS'' mode with CONSULT.
Changing the diagnostic test mode from Diagnostic Test Mode II to Mode I. (Refer to EC-32.)
+If the battery terminal is disconnected, the diagnostic trouble code will be lost within 24 hours.
+When you erase the DTC, using CONSULT is easier and quicker than switching the diagnostic test
modes.
HOW TO ERASE DTC (With CONSULT)
1. If the ignition switch stays ``ON'' after repair work, be sure to turn ignition switch ``OFF'' once. Wait at least
5 seconds and then turn it ``ON'' (Engine stopped) again.
2. Turn CONSULT ``ON'' and touch ``ENGINE''.
3. Touch ``SELF-DIAG RESULTS''.
4. Touch ``ERASE''. (The DTC in the ECM will be erased.)
HOW TO ERASE DTC (No Tools)
1. If the ignition switch stays ``ON'' after repair work, be sure to turn ignition switch ``OFF'' once. Wait at least
5 seconds and then turn it ``ON'' again.
2. Change the diagnostic test mode from Mode II to Mode I. (Refer to EC-32.)
SEF691S
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EC-30