12 13 009 Checking ignition coils (M60, M62, S62): Notes

CAUTION: Instructions for working on ignition system, refer to 12 00 Contents of Engine Electrical System General .
Switch off ignition.

Acoustic cover version 1:

(Acoustic cover screwed down)

Remove sealing caps (1).

Release nuts (2).

Remove acoustic cover.

Fig 1: Removing Acoustic Cover Version 1

Courtesy of BMW OF NORTH AMERICA, INC.

Acoustic cover version 2:

(Acoustic cover with press-stud fastener)

Press press-stud fasteners (1 to 4) in succession and simultaneously raise acoustic cover slightly. Remove acoustic cover when all four press-stud fasteners have been unlocked.

Installation

Position acoustic cover and press downwards until press-stud fasteners (1... 4) are heard to engage.

Fig 2: Identifying Acoustic Cover Version 2

Courtesy of BMW OF NORTH AMERICA, INC.

Acoustic cover version 3 (E53):

Turn fasteners on acoustic cover 90° counterclockwise.

Remove acoustic cover.

Fig 3: Identifying Acoustic Cover Version 3 (E53)

Courtesy of BMW OF NORTH AMERICA, INC.

M60, M62:

Remove sealing caps.

Release nuts.

Remove covers on ignition coils.

Fig 4: Removing Covers On Ignition Coils

Courtesy of BMW OF NORTH AMERICA, INC.

Installation

Check profile seal (1) for damage and correct seating, replace if necessary.

Fig 5: Identifying Profile Seal

Courtesy of BMW OF NORTH AMERICA, INC.

S62:

Release cap nuts (1) on left and right.

Remove cover (2) on ignition coils on left and right.

Fig 6: Identifying Cover On Ignition Coils On Left And Right

Courtesy of BMW OF NORTH AMERICA, INC.

M60, M62, S62:

Use adapter set 12 7 040 to check ignition coils.

NOTE: Attach special tool 12 7 045 to single adapter 12 7 041.

Fig 7: Attaching Special Tool 12 7 045 To Single Adapter 12 7 041

Courtesy of BMW OF NORTH AMERICA, INC.

Switch off ignition!

Attach single adapters 12 7 041 to ignition coils of left and right cylinder banks.

Fig 8: Attaching Single Adapters To Ignition Coils

Courtesy of BMW OF NORTH AMERICA, INC.

Connect single adapters 12 7 041 with connecting cable set 12 7 043.

NOTE: Pass long connecting cable over engine.

Fig 9: Passing Long Connecting Cable Over Engine

Courtesy of BMW OF NORTH AMERICA, INC.

Connect DIS Tester to diagnosis socket. Connect RZV connection line of DIS Tester to last test adapter.

Connect trigger pliers of DIS Tester to supply lead of ignition coil of 1st cylinder.

Select < Measurement >
Select < Preset measurements >
Select < Secondary ignition signal >
Select < Stationary ignition distribution >
Select < 8 cylinders >

For subsequent procedure, follow DIS instructions.

Notes on troubleshooting using adapter set:

Start Of Ignition Voltage Peak
Level Of Ignition Voltage
Level Of Combustion Voltage
Period Of Combustion
Combustion Curve Characteristics
Start Of Decay Process
Termination Oscillations

Fig 10: Evaluation Of Normal Oscillogram Patterns (1 Of 5)

Courtesy of BMW OF NORTH AMERICA, INC.

Secondary voltage patterns, beside one another: Evaluation of ignition voltage peaks at idle speed (this example shows an engine with 4 cylinders). Note: The display of ignition voltage spikes is approx. 20-25% lower than the real value. The uniformity of all cylinders to each other is more important than the height of ignition voltage peaks. Differences of 3000-4000 V are permitted. In event of greater differences, refer to Further Fault Patterns With Evaluation .

Fig 11: Evaluation Of Normal Oscillogram Patterns (2 Of 5)

Courtesy of BMW OF NORTH AMERICA, INC.

Evaluation of ignition voltage peaks at increased speed of approx. 2000 RPM (this example shows an engine with 4 cylinders).

Fig 12: Evaluation Of Normal Oscillogram Patterns (3 Of 5)

Courtesy of BMW OF NORTH AMERICA, INC.

Secondary voltage diagrams, superimposed: Evaluation of combustion characteristics curve and decay characteristics at idle speed (this example shows a 4-cylinder engine).

Fig 13: Evaluation Of Normal Oscillogram Patterns (4 Of 5)

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil comparison,
Evaluation of ignition voltage peaks and decay characteristics at idle speed.
Make: Bremi
1. 1. Normal ignition voltage spikes (6000-9000 V)
2. 2. Normal start of attenuation processes
Make: Beru
1. 3. Normal ignition voltage peak
2. 4. High initial level of attenuation processes
Make: May & Christe
1. 5. Normal ignition voltage peak
2. 6. Low initial level of attenuation processes
Make: Bosch
1. 7. Low ignition voltage peak
2. 8. Normal start of attenuation processes
Note: At high speeds, the ignition voltage peak falls very markedly relative to the peaks on units from other ignition coil manufacturers.

Fig 14: Evaluation Of Different Ignition Coils (Idle Speed)
Courtesy of BMW OF NORTH AMERICA, INC.

Evaluation of combustion voltage characteristics at raised engine speed of approx. 2500 RPM.
Make: Bremi
1. 1. Normal oscillation of the combustion voltage curve
2. 2. Normal combustion period
3. 3. 3 to 4 attenuations
Make: Beru
1. 1. Normal oscillation of the combustion voltage curve
2. 2. Normal combustion period
3. 3. At least 3 decay oscillations
Make: May & Christe
1. 1. No oscillation on combustion voltage curve
2. 2. Normal combustion period
3. 3. At least 5 decay oscillations
Make: Bosch
1. 1. Normal oscillation of the combustion voltage curve
2. 2. Long combustion period
3. 3. At least 3 decay oscillations

Fig 19: Identifying Single Adapters 12 7 041

Courtesy of BMW OF NORTH AMERICA, INC.