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1689 Rover 214 & 414 Updated Version 09/97

5B

Chapter 5 Part B Ignition system - fuel injection engines

Crankshaft sensor and reluctor ring - removal and refitting . . . . . . . 6Distributor - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Engine management electronic control unit (ECU) - removal and

refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1

HT coil - removal, testing and refitting . . . . . . . . . . . . . . . . . . . . . . . 4HT leads, distributor cap and rotor arm - inspection and renewal . . 3Ignition system - testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Ignition timing - checking and adjustment . . . . . . . . . . . . . . . . . . . . 8Spark plugs - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

5B•1

Contents

SpecificationsGeneralSystem types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rover/Motorola Modular Engine Management System (MEMS), fully

electronic, controlled by ECU. Either single-point (SPi) or multi-point(MPi) fuel injection.

Firing order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-4-2 (No 1 cylinder at timing belt end)Direction of crankshaft rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clockwise (viewed from right-hand side of vehicle)

DistributorType . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spark distribution only (ignition timing controlled by ECU)Direction of rotor arm rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-clockwise (viewed from left-hand side of vehicle)Distributor cap:

SPi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUU 1186MPi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NJD 10010

Rotor arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUU 1641 (resistive type)

Engine management Electronic Control Unit (ECU)SPi:

With catalytic converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MNE 10008, MNE 10023 or MNE 10042Without catalytic converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MNE 10011, MNE 10013 or MNE 10051

MPi:Alloy inlet manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MNE 101470Plastic inlet manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MKC 101730

Ignition timing @ idle speed (ECU-controlled)SPi with catalytic converter - by ECU number (vacuum pipe connected) :

MNE 10008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13º ± 2º BTDCMNE 10023, MNE 10042 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14º ± 2º BTDC

SPi without catalytic converter - by ECU number (vacuum pipe connected) :MNE 10011 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 ± 2º BTDCMNE 10013, MNE 10051 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 ± 2º BTDC

MPi - by ECU number (vacuum pipe connected) :MNE 101470, MKC 101730 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ± 5º BTDC

Note: Nominal value given for checking purposes only - not adjustable and may vary under ECU control

Easy, suitable fornovice with littleexperience

Fairly easy, suitablefor beginner withsome experience

Fairly difficult,suitable for competentDIY mechanic

Difficult, suitable forexperienced DIYmechanic

Very difficult,suitable for expert DIYor professional

Degrees of difficulty

54321

1 General information andprecautions

General informationThe ignition system is fully electronic in

operation, incorporating an Electronic ControlUnit (mounted on the engine compartmentbulkhead), a distributor (driven off the inletcamshaft left-hand end) and a crankshaftsensor (mounted in the left-hand rear end ofthe engine cylinder block/crankcase) whichregisters with the reluctor ring fixed to theflywheel. The system also incorporates sparkplugs, HT leads, an ignition HT coil andassociated wiring.

The system is divided into two circuits,which are the primary (low tension/LT) andsecondary (high tension/HT) circuits. Theprimary circuit consists of the battery, ignitionswitch, ignition HT coil primary windings, ECUand wiring. The secondary circuit consists ofthe ignition HT coil secondary windings, thedistributor cap and rotor arm, the spark plugsand the interconnecting HT leads.

The ECU controls both the ignition systemand the fuel injection system, integrating thetwo in a complete engine managementsystem. Refer to Chapter 4 for information onany part of the system not given in thisChapter.

As far as the ignition system is concerned,the ECU receives information in the form ofelectrical impulses or signals from thecrankshaft sensor (which gives it the enginespeed and crankshaft position), from thecoolant temperature sensor (which gives it theengine temperature), from the throttle pedalswitch (which tells it when the throttle is

closed) and from the manifold absolutepressure sensor (which gives it the load on theengine). All these signals are compared by theECU, using digital techniques, with set valuespre-programmed (mapped) into its memory.Based on this information, the ECU selectsthe ignition timing appropriate to those valuesand controls the ignition HT coil accordingly.

This means that the distributor is just that, adistributor of the HT pulse to the appropriatespark plug. It has no effect whatsoever on theignition timing. Also, the system is so sensitivethat, at idle speed, the ignition timing may beconstantly changing. This should beremembered if trying to check the ignitiontiming.

PrecautionsRefer to Part A of this Chapter.

2 Spark plugs - renewal

Refer to Chapter 1.

3 HT leads, distributor cap androtor arm - inspection andrenewal

1 Refer to Chapter 1. Note the anti-flashshield fitted beneath the rotor arm.

4 HT coil - removal, testing and refitting

1 Refer to Section 4 in Part A of this Chapter.

5 Distributor - removal and refitting 3

Removal1 Disconnect the battery negative terminal.2 Disconnect the HT leads from the sparkplugs.3 Undo the two distributor cap retaining screwsand remove the cap and leads as an assembly.4 Slacken and remove the grub screwsecuring the rotor arm to the camshaft endthen pull off the rotor arm (see illustration).5 Remove the distributor cap insulating platefrom the cylinder head.6 Examine each components for signs ofwear or damage and renew as necessary.

Refitting7 Refitting is a reverse of the removalprocedure. Tighten the rotor arm grub screwand distributor cap screws to the specifiedtorque settings.

Crankshaft sensorType . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ADU 7340

HT coilType:

SPi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NEC 10002 or NEC 10003MPi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NEC 10002, NEC 10003 or NEC 10004

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bosch, Ducellier or Rudi CajavecCurrent consumption - average . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.25 to 0.75 amps @ idle speedWinding resistances:

Primary:Spi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 to 0.5 ohms @ 20ºCMpi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 to 0.8 ohms @ 20ºC

Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 15 K ohms @ 20ºC

Torque wrench settings Nm lbf ftSpark plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 18Distributor cap screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1Distributor rotor arm grub screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7Reluctor ring to flywheel setscrews . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2Ignition HT coil mounting screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5Crankshaft sensor mounting screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4Crankshaft sensor lead-to-flywheel cover plate screw . . . . . . . . . . . . . 6 4

5B•2 Ignition system – fuel injection engines

5.4 Distributor assembly

1 Distributor cap 3 Grub screw2 Rotor arm 4 Insulating plate


6 Crankshaft sensor andreluctor ring - removal andrefitting

3Removal

Crankshaft sensor1 Disconnect the battery negative terminal.2 Disconnect the sensor wiring at itsconnector plug on the flywheel rear coverplate, then undo the retaining screw to releasethe wiring lead.3 Remove the two retaining screws andwithdraw the sensor from the cylinderblock/crankcase (see illustration).4 Inspect the sensor for obvious signs of wearor damage and renew it if necessary. No datais available to enable the sensor to be tested. Ifthought to be faulty, it can be checked only bysubstitution with a new component.

Reluctor ring5 Remove the flywheel.6 Undo the two screws securing the reluctorring to the rear of the flywheel and withdraw it(see illustration).

7 Check the ring for obvious signs of wear ordamage and renew it if necessary.

Refitting

Crankshaft sensor8 Ensure that the sensor and cylinderblock/crankcase mating surfaces are cleanthen refit the sensor and tighten its retainingscrews to the specified torque.9 Connect the sensor wiring connector andtighten the connector mounting screw to thespecified torque.10 Reconnect the battery negative terminal.

Reluctor ring11 Refitting is a reversal of the removalprocedure. Tighten the reluctor retainingscrews to the specified torque.

7 Engine managementelectronic control unit (ECU)- removal and refitting

Refer to Chapter 4.

8 Ignition timing - checking and adjustment

Refer to Chapter 1.

9 Ignition system - testing 51 If a fault appears in the engine management(ignition/fuel) system, first ensure that the faultis not due to poor maintenance. Check thatthe air cleaner filter element is clean, the sparkplugs are in good condition and correctlygapped, and that the engine breather hosesare clear and undamaged. Also check that theaccelerator cable is correctly adjusted. If theengine is running very roughly, check thecompression pressures, bearing in mind thatpossibly one of the hydraulic tappets might befaulty, producing an incorrect valve clearance.2 If these checks fail to reveal the cause ofthe problem, the vehicle should be taken to asuitably-equipped Rover dealer for testing. Awiring block connector is incorporated in theengine management circuit into which aspecial electronic diagnostic tester can beplugged. The tester will locate the fault quicklyand simply, alleviating the need to test all thesystem components individually, which is atime-consuming operation that carries a highrisk of damaging the ECU.3 The only ignition system checks which canbe carried out by the home mechanic arethose described for the spark plugs, HT leads,rotor arm and distributor cap (Chapter 1), andthe ignition HT coil (this Chapter). Ifnecessary, the system wiring and wiringconnectors can be checked as described inChapter 12, ensuring that the ECU wiringconnectors have first been disconnected.

Ignition system – fuel injection engines 5B•3

6.3 Removing crankshaft sensor (wiringlead screw arrowed)

6.6 Reluctor ring-to-flywheel screws(arrowed)

5B
