BMW X5 Owners & Service Manuals

BMW X5: Ignition Coil

NOTES ON CHECKING IGNITION SYSTEM

Troubleshooting

Oscillograms

Check

ADDITIONAL FAULT NOTES FOR TROUBLESHOOTING

Necessary preliminary tasks:

Ignition Coil
Fig. 5: Identifying Diagnosis Information System

CHECKING SECONDARY SIGNAL FOR STATIONARY IGNITION DISTRIBUTION

Special tools required:

Remove ignition coil. Clip special tool 12 7 030 on relevant ignition coil to be tested. Clip high tension clip around ignition lead.

Ignition Coil
Fig. 6: Removing Ignition Coil

Connect earth lead of adapter to vehicle earth and ignition coil. Connect up diagnosis connector.

If trigger signal is not present (terminal 1), connect black clip of universal adapter cable to pin 1 of primary adapter cable.

Ignition Coil
Fig. 7: Connecting Earth Lead Of Adapter To Vehicle Earth And Ignition Coil

Produce a stationary signal by pressing key R on the tester.

NOTE: Neighboring ignition leads could produce interference on the screen of the oscilloscope.

Interrogate fault memory and its fault reports.

Ignition Coil
Fig. 8: Identifying Waveform

FURTHER FAULT PATTERNS WITH EVALUATION

Necessary preliminary tasks:

Ignition Coil
Fig. 9: Identifying Diagnosis And Information System

CHECKING ROD-TYPE IGNITION COILS (M54, M56, N40, N42, N43, N45, N46, N52, N62, N62TU, N73)

Special tools required:

Necessary preliminary tasks:

Unlock plug fastener (1) of ignition coil.

Ignition Coil
Fig. 10: Unlocking Plug Fastener Of Ignition Coil

Detach plug (1) in direction of arrow.

Pull out ignition coil (2) towards top.

NOTE: Procedure applies to all rod-type ignition coils.

Ignition Coil
Fig. 11: Detaching Ignition Coil Connector

Install special tool 12 7 050.

Installation:

Special tool 12 7 050 is attached between spark plug and rod-type ignition coil.

Ignition Coil
Fig. 12: Identifying Special Tool 12 7 050

Secondary measurement:

Connect KV clip-on probe (1) of DIS Tester to special tool 12 7 050.

Procedure on DIS Tester:

For subsequent procedure, follow DIS instructions.

Ignition Coil
Fig. 13: Identifying KV Clip-On Probe

NOTE: Illustration shows: KV clip-on probe (1) US version.

Primary measurement:

Connect 26-pin pin box with special tool 12 1 301 to connector (1) DME module 5.

Procedure on DIS Tester:

For subsequent procedure, follow DIS instructions.

IMPORTANT: Ignition signal is a multiple spark ignition.

Ignition Coil
Fig. 14: Identifying Connector

Illustration of multiple spark ignition

  1. Start of ignition peak.
  2. Level of ignition voltage.
  3. Level of sparking voltage.
  4. Spark duration.
  5. Sparking voltage curve.
  6. Start of decay process.
  7. Decay process.

Ignition Coil
Fig. 15: Multiple Spark Ignition Graph

M54 / M56 / N40 / N42 / N45 / N46 / N62 / N73:

The following ignition oscillogram applies to engines with multiple spark ignition from a production date of April 2001:

Depending on engine temperature (approx. -20º to 100º) and engine speed (< 2000 rpm.), some ignition voltage peaks (approx. 1-5 ignition peaks) can occur before the typical ignition voltage characteristic.

The additional ignition peaks play no role in diagnosis.

The last ignition peak (1) on the oscillogram is decisive.

Ignition Coil
Fig. 16: Identifying Waveform Of Ignition Peak

NOTE: The display of the ignition voltage peak is approx. 20-25 % lower than the real value.

It is not the height of the ignition voltage peaks but rather the uniformity of all the cylinders that is important.

Differences of 3000 to 4000 volts are permitted.

REPLACING IGNITION COIL (N62TU)

Necessary preliminary tasks:

Release screws and remove holder (1).

Pull ignition coil covers (2) out of rubber grommets.

Ignition Coil
Fig. 17: Locating Holder And Screws

Unlock plug fastener (1) of ignition coil.

Ignition Coil
Fig. 18: Unlocking Plug Fastener Of Ignition Coil

Detach ignition coil connector in direction of arrow.

Pull out ignition coil (2).

This procedure is applicable to all ignition coils.

Ignition Coil
Fig. 19: Detaching Ignition Coil Connector

Installation:

Insert rubber seal on ignition coils (2) between guides.

Ignition Coil
Fig. 20: Inserting Rubber Seal On Ignition Coils Between Guides

Assemble engine.

NOTE: Read out DME fault memory.

Check function of DME.

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