Nissan PULSAR N13 Series / ASTRA LD Series. Manual - part 26

Fuel and Engine Management

 

105

 

 

DISTRIBUTOR

 

To Remove and Install

 

(1)  Disconnect the negative battery terminal. 
(2)  Disconnect the distributor wiring connec- 

tors. 

(3)  Disconnect the high tension leads from the 

spark plugs. 

(4)  Remove the distributor cap retaining screws 

and remove the cap and high tension leads from the 
vehicle. 

(5)  Turn the engine in the normal direction of 

rotation until the mark on the crankshaft pulley aligns 
with the timing pointer and the rotor is pointing 
towards the No. 1  spark plug lead terminal on the 
distributor cap. 

(6)  Mark the distributor body to camshaft hous- 

ing relationship to aid in setting the ignition timing on 
installation. 

(7)  Remove the distributor retaining nuts and 

withdraw the distributor from the camshaft housing. 

Installation is a reversal of the removal procedure 

with attention to the following points:

 

(1) Ensure that the engine has not been rotated 

while the distributor has been removed. If the engine 
has been rotated, align the timing marks and ensure 
that No. 1 piston is on the compression stroke.

 

 

(2)  Check and renew the distributor base O ring 

if the sealing quality is suspect. 

(3)  Install the distributor to the camshaft 

hous- 
ing, aligning the coupling with the slot in the camshaft 
and ensuring that the rotor does not move in relation 
to the distributor body. Align the marks made on 
removal. 

(4)  Install and securely tighten the distributor 

retaining nuts. 

(5)  Install the distributor cap and tighten 

the 
retaining screws. 

(6)  Connect the distributor wiring connector. 
(7)  Connect the negative battery terminal and 

check the ignition timing as previously described in 
this section. 

To Dismantle and Assemble

 

With the distributor removed from the engine and 

the distributor cap removed, dismantle the distributor 
as follows:

 

(1)  Disconnect the pickup coil wiring connector 

from the control module. 

(2)  Measure the resistance between the terminals 

on the pickup coil wiring connector and the distribu- 
tor body. The resistance should be infinity. 

(3)  Measure the resistance between the terminals 

 

 

View of the distributor removed from the engine show- 

ing the pickup coil connector. 

0 RING 

RETAINING SPRING

 

Dismantled view of the distributor. 

106

 

Fuel and Engine Management

 

 

on the pickup coil wiring connector. The resistance 
should be 500-1 500 ohms.

 

If the resistance is not as specified in either of the 

above tests, renew the pickup coil.

 

(4)  Remove the retaining spring from the dis- 

tributor drive coupling. 

(5)  Using a pin punch, remove the drive pin 

from the shaft. 

(6)  Remove the drive coupling, washer, tang 

washer and thrust spring from the shaft. 

(7)  Remove the rotor and shaft from the distrib- 

utor housing. 

(8)  Remove the retainer from the distributor 

housing and withdraw the pickup coil. 

(9)  Remove the retaining screws and remove the 

control module from the distributor body. 

(10)  Carefully lever the stationary pole from the 

housing using a suitable screwdriver. 

Assembly is a reversal of the dismantling proce- 

dure with attention to the following points:

 

(1)  Ensure that the mating surfaces of the dis- 

tributor housing and the control module are clean. 

(2)  Apply a silicone heat sink compound to the 

surfaces between the control module and the distrib- 
utor housing. 

IGNITION COIL

 

To Test

 

(1)  Disconnect the grey wiring connector and the 

black wiring connector from the ignition coil in that 
order. 

(2)  Measure the resistance between coil terminal 

I and the coil body. There should be a high resistance. 

(3)  Measure the resistance between coil termi- 

nals 2 and 4. There should be a low resistance. 

(4)  Measure the resistance between coil terminal 

3 and the high tension terminal. The resistance should 
be other than infinity. 

If any of the tests indicate a fault, renew the 

ignition coil.

 

To Remove and Install

 

(1)  Disconnect the negative battery terminal. 
(2)  Disconnect the grey wiring connector and the 

black wiring connector from the ignition coil in that 
order. Disconnect the high tension lead. 

(3)  Remove the coil mounting bracket retaining 

bolts and remove the coil and bracket  from the 
engine. 

Installation is a reversal of the removal procedure.

 

ELECTRONIC SPARK TIMING 
To Test - Code 42

 

(1)  Erase  the  self diagnosis code  memory  as 

previously described. 

(2)  Start and run the engine at idle speed for 60 

seconds or until the ECM warning lamp lights. 

(3)  Stop the engine, switch the ignition On and 

connect a jumper lead between terminals A and B on 
the diagnostic link connector. Note any fault codes 
displayed. 

If code 42 is displayed, proceed to operation (4).

 

If code 42 is not displayed, but was displayed 

when the self diagnosis test procedure was originally 
performed, an intermittent fault is indicated. Proceed 
as follows:

 

(a)  Check for faulty wiring connections. Check 

that all wiring connectors are clean and secure. 

(b)  Check that all earth wires are secure. 

 

(4)  With the ignition switched Off, disconnect 

the control unit wiring connectors. 

(5)  With the ignition switched On, measure the 

resistance between the control unit wiring connector 
terminal D4 and a good earthing point. The resistance 
should be less than 500 ohms. 

If the ohmmeter reading is as specified, check the 

wiring harness between the distributor 4 pin wiring 
connector terminal D and the control unit wiring 
connector terminal D4 for continuity. Repair or 
renew the wiring harness as necessary. Also ensure 
that the distributor 4 pin wiring connector is making 
good contact when connected to the distributor.

 

If no fault can be found, renew the ignition 

control module.

 

If the resistance is as specified proceed as follows.

 

(6)  With the lead of a test lamp connected to the 

positive battery terminal, backprobe the control unit 
wiring connector terminal D5.

 

If the test lamp does not light, proceed to 

operation (7).

 

If the test lamp lights, disconnect the 4 pin wiring 

connector from the distributor. If the test lamp 
remains illuminated check the wiring harness between 
the distributor 4 pin wiring connector terminal B and 
the control unit wiring connector terminal D5 for 
shorts to earth. Repair or renew the wiring harness as 
necessary. If the test lamp extinguishes, renew the 
ignition system control module.

 

(7)  Connect an ohmmeter between the control

 

Installed view of the ignition coil showing the coil

terminal identification. 

Fuel and Engine Management

 

107

 

 

unit wiring connector terminal D4 and a good earth- 
ing point.

 

(8)  With the lead of a test lamp connected to the 

positive battery terminal, backprobe the control unit 
wiring connector terminal D5. As the test lamp probe 
touches the terminal, the ohmmeter reading should 
change from less than 500 ohms to over 5 000 ohms.

 

If the ohmmeter reading is not as specified, 

proceed to operation (9).

 

If the ohmmeter reading is as specified, switch the 

ignition Off and install the control unit wiring connec- 
tors. Run the engine for 60 seconds or until the ECM 
warning lamp lights and check for fault codes.

 

If code 42 is displayed renew the control unit.

 

If code 42 is not displayed, check the wiring 

harness for continuity or shorts between the control 
unit wiring connector terminals D4 and D5 and the 
distributor 4 pin wiring connector terminals D and B.

 

(9)  Disconnect the 4 pin wiring connector from 

the distributor.

 

(10)  Check for continuity between the control 

unit wiring connector terminal D4 and a good earth- 
ing point. There should be no continuity.

 

If the continuity is not as specified, check the 

wiring harness between the distributor 4 pin wiring 
connector terminal D and the control unit wiring 
connector terminal D4 for shorts to earth. Repair or 
renew the wiring harness as necessary.

 

If the continuity is as specified, check the wiring 

harness between the distributor 4 pin wiring connec- 
tor terminal B and the control unit wiring connector 
terminal D5 for continuity. Repair or renew the 
wiring harness as necessary. If no fault is found, renew 
the ignition system control module.

 

CONTROL UNIT

 

To Test Input Circuits — Code 55

 

(1)  Switch  the  ignition  On  with   the  engine 

stopped and note the ECM warning lamp. 

(2)  If a steady light   is  showing, proceed  to 

operation (3). 

If code 55 is displayed, proceed as follows:

 

(a)  Switch the ignition Off and disconnect the 

wiring connector from the control unit. 

(b)  Switch the ignition On and measure the 

voltage at the wiring connector on terminals C10, 
C I 1 ,  C12, C13 and A9. Disregard terminal C12 on 
1.6 liter engines. 

(c)  If there is voltage at any of the terminals 

tested above, a faulty wiring harness is indicated. 
Repair the short circuit to voltage and return to 
operation (1). 

(d)  If there is no voltage at any of the terminals 

tested, a faulty control unit is indicated. Renew the 
control unit and return to operation (1). 

(3)  Connect a jumper lead between terminals A 

and B on the diagnostic link connector and note if 
code 55 is displayed.

 

If code 55 is displayed, an intermittent fault is 

indicated. Switch Off the engine, erase the self diag- 
nosis codes and run the engine for 2 minutes. Return 
to operation (1) and repeat the test procedures.

 

If code 55 continues to return, renew the control 

unit.

 

To Remove and Install

 

(1)  Disconnect the negative battery terminal. 
(2)  Slide the passengers front seat to the rear- 

most position and working under the seat, disconnect 
the control unit wiring connectors. 

(3)  Disengage the plastic control unit cover from 

the mounting plate and remove the control unit from 
the vehicle. 

(4)  If necessary, remove the screws retaining the 

Mem-Cal cover to the control unit. 

(5)  Release the Mem-Cal unit  retaining clips, 

grasp the Mem-Cal unit at each end and remove it 
from the control unit. 

Installation is a reversal of the removal procedure 

with attention to the following points:

 

(1) When installing the Mem-Cal unit, align the 

notches in the Mem-Cal with those in the control unit 
and push on each end of the Mem-Cal unit. Do not 
push on the middle section of the Mem-Cal unit.

 

View of the control unit with the Mem-Cal unit re-

moved. 

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Fuel and Engine Management

 

 

 

Installed view of the control unit with the passengers 

seat removed. 

(2)  Secure  the   Mem-Cal  unit  retaining  clips. 

Ensure that the clips locate into the Mem-Cal unit. 

(3)  When installing a new control unit, transfer 

the identification and bar code label to the new 
control unit. 

(4)  Ensure that the control unit wiring connec- 

tors are securely installed to the control unit. 

(5)  Activate the self diagnosis codes. If code 51 

is displayed or the Check Engine warning lamp is 
constantly illuminated, the Mem-Cal unit is not fully 
installed. If the Mem-Cal unit is installed correctly, a 
fault in the Mem-Cal unit is indicated. Renew the 
Mem-Cal unit as previously described. 

To Check Power Supply and Earth Circuit

 

(1)  Disconnect the control unit wiring connec- 

tors and check for voltage at terminals B1 and C16.

 

If there is no voltage check the fusible link which 

is located third from the front in the fusible link 
connecting block. If the fusible link is serviceable, 
repair the open circuit in the wiring harness.

 

(2)  Check for continuity to earth on terminals 

A12,  D1,  D6 and also D3 and D10 on   1.8  liter 
engines.

 

If there is no continuity check the earth connec- 

tions at the right hand rear cylinder head bolts. If the 
connections are clean and secure, repair the open 
circuit in the wiring harness.

 

MEM-CAL UNIT 
To Test - Code 51

 

If code 51 is displayed during the self diagnosis 

test procedure, proceed as follows:

 

(1)  Check that the Mem-Cal unit is fully inserted 

in the control unit. 

(2)  Erase the fault code memory and retest for 

fault codes. 

(3)  If code   51   is  still  displayed,   renew the 

Mem-Cal unit. 

 

(4)  Erase the fault code memory and retest for 

fault codes. 

(5)  If code 51 is still displayed, renew the control 

unit. 

To Remove and Install

 

The Mem-Cal unit is incorporated within the 

control unit. Refer to the previous heading for the 
removal and installation procedure.

 

FUEL PUMP AND EGI RELAYS

 

To Remove and Install

 

(1)  Disconnect the negative battery terminals. 
(2)  Remove the fuse panel cover which is lo- 

cated adjacent to the steering column under the 
instrument cluster. 

(3)  Remove the spare fuse holder from the fuse 

panel and remove the relevant relay from the connec- 
tor. 

Installation is a reversal of the removal procedure.

 

 

View showing the location of the EGI and fuel pump 

relays. 

To Test Relays

 

NOTE: When testing the fuel pump relay 
circuit ensure that the EGI relay is service- 
able and installed to the relay connector

 

(1)  Remove the relevant  relay as previously 

described. 

(2)  Using an  ohmmeter,  check for continuity 

between terminals 1 and 2, and 3 and 5. 

Continuity should exist between terminals 1 and 2 

but should not exist between terminals 3 and 5.

 

(3)  Using suitable jumper leads, apply 12 volts 

to terminal 1 and connect terminal 2 to a good earth 
point. 

(4)  Connect the ohmmeter between terminals 3 

and 5. Continuity should exist. If continuity does not 
exist, renew the relay.