Bosch FIX 7677 Mode D'emploi page 20

12. Move RED test lead to secondary
ignition coil terminal.
• Refer to vehicle service manual for
location of secondary ignition coil
terminal.
• Verify BLACK test lead is con-
nected to primary ignition coil nega-
tive (-) terminal.
13. View reading on display.
14. If vehicle is DIS, repeat Steps 12
and 13 for remaining ignition coils.
15. Test Results - Secondary Coil
• Typical resistance range of sec-
ondary ignition coils is 6.0 - 30.
0KΩ.
• Refer to vehicle service manual for
your vehicles resistance range.
16. Repeat test procedure for a HOT
ignition coil.
NOTE: It is a good idea to test
ignition coils when they are both hot
and cold, because the resistance of
the coil could change with tempera-
ture. This will also help in diagnosing
i n t e r m i t t e n t i g n i t i o n s y s t e m
problems.
17. Test Results - Overall
Good Ignition Coil: Resistance read-
ings in Steps 10, 15 and 16 were
within manufacturers specification.
Bad Ignition Coil: Resistance read-
ings in Steps 10, 15 and 16 are not
within manufacturers specification.
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