BMW 7 Series: Notes On Checking Ignition System

Troubleshooting

• Fault in fuel injection system
• Spark plug faults
• Ignition coil faults
• Further fault patterns with evaluation
• Additional fault notes for troubleshooting

Oscillograms

• Normal oscillogram
• Oscillograms of ignition coils from different manufacturers

Check

• Secondary signal for stationary ignition distribution

NOTES ON HANDLING WIRING HARNESSES AND CABLES

The following applies in general

To avoid damage, observe the following instructions:

• Avoid compressive and tensile loads
• Make sure cables are laid without kinks or abrasions
• Ensure non-contacting routing at sharp-edged body components; use edge protection if necessary
• Secure additionally laid cables/lines with cable straps

The following additionally applies

Shielded lines

Contact points in the shield can cause problems with regard to noise radiation and interference immunity.

Consequently, distinctions have to be drawn between the following types:

• Shielded RTK031 coaxial lines may only be repaired with special crimping tool for repairing the coaxial line RTK031.

CVBS lines

• CVBS lines may not be repaired.
• CVBS lines must be replaced in their entirety.

HSD lines

• HSD lines may not be repaired.
• HSD lines must be replaced in their entirety.

Optical fibre cable :

NOTE: Optical fibre cables are colored differently as follows:

• Green = MOST (M edia O riented S ystems T ransport) optical fibre
• Yellow = ISIS (I ntelligent S afety I ntegration S ystem) optical fibre
• Orange = repair optical fibre cables

IMPORTANT:

• Optical fibre cables are permitted to show only one separation point (bridge), replace optical fibre cables if necessary
• Smallest permissible bending radius is 25 mm
• Avoid influence of heat = 85º

Treating cables and optical fibre cables

FlexRay:

It is possible to repair the FlexRay. In the event of damage, the cables can be joined with conventional butt connectors.

NOTE:

• The line is a twisted cable. If possible, maintain twist in line after repair.

Airbag lines:

Repairing airbag cables

Ribbon cables:

Repairing ribbon cables Z

NOTES ON HANDLING WIRING HARNESSES AND CABLES

The following applies in general

To avoid damage, observe the following instructions:

• Avoid compressive and tensile loads
• To ensure professional repairs, perform repair work only with BMW-approved or recommended special tools and spare parts
• Make sure cables are laid without kinks or abrasions
• Ensure non-contacting routing at sharp-edged body parts; use edge protection if necessary
• Secure additionally laid cables/leads with cable ties

The following additionally applies

Shielded lines (coaxial lines):

IMPORTANT: Shielded lines may not be repaired!

• This may lead to indifferences in noise radiation and interference immunity at contact points in the shield
• To satisfy the requirements of the type approval, it is essential to replace shielded cables completely

Fibre-optic cable:

NOTE: Fibre-optic cables are colored differently as follows:

• Green = MOST (M edia O riented S ystems T ransport) optical fibre
• Yellow = ISIS (I ntelligent S afety I ntegration S ystem) optical fibre
• Orange=repair fibre-optic cables

IMPORTANT:

• Optical fibres may only reveal one separation point (bridge); renew optical fibre if necessary
• Smallest permissible bending radius is 25 mm
• Avoid effects of heat = 85º

Treating cables and fibre-optic cables: See TREATING CABLES AND FIBRE-OPTIC CABLES.

FlexRay

It is possible to repair the FlexRay. In the event of damage, the cables can be joined with conventional BUTT CONNECTORS AND HEAT-SHRINK HOSES.

NOTE:

• FlexRay lines may only reveal one separation point (bride); renew complete line if necessary
• The cable is a twisted cable. If possible, maintain twisted cable after repair

Airbag lines:

REPAIRING AIRBAG CABLES.

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