Volvo 819 E - Page 104

Group 28 Ignition systems
Fault tracing , Rex-I
N26
Check ignition coil and power stage (4201
Undo connectors.
Separate ignition coil from power stage
Remove both mounting screws with a Torx TX 215
screwdriver and li
ft off ignition coil.
N27
Measure resistance across ignition coil terminals
Measure resistance across LT terminals (+ and·) as il-
lustrated.
Resistance
should be approx . 0.5 ohm.
Measure resistance between HT terminal and each LT
terminal.
Res istance should be approx . 5 kohm .
N28
Check for voltage at ignition coil/power stage
terminals
Switch on ignition.
Measure voltage between terminal A in 3-pole connec-
tor and ground. Instrument should indicate system
voltage (12
VI." voltage is absent or I. too low : Check
supply lead connections at
control unit and ignition
coil/power stage.
Check that voltage does
not fall below 10 .5 V when
starter motor is operated.
Switch
off ignition .
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