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White Wire Circuit

  1. Crank engine and check for sparks. If sparks occur, ignition system is OK. Check fuel system instead. If no sparks occur, measure battery voltage while cranking engine. Then, without disconnecting the control module's 2-wire connector, measure voltage on white wire while cranking engine.
  2. Using a straight pin, puncture white wire between control module and connector. See Figure. Voltage should equal battery cranking voltage. If so, proceed to step 3)  . If not equal, repair wire feeding the control module white wire, and repeat test.
  3. If voltage in step  2) was equal to battery cranking voltage, or if no spark occurred after repairing wire feeding white wire, connect positive lead of voltmeter to ignition coil positive ("BAT") terminal and negative lead to ground. Measure voltage while cranking engine. Battery voltage should exist. If so, proceed to step 4)  . If not, repair wire feeding coil positive ("BAT") terminal and repeat test. If still no sparks occur, see INTERMITTENT OPERATION CHECK .
  4. If voltage at coil positive ("BAT") terminal was equal to battery voltage, but problems still exist, substitute but do not install a known good control module and repeat the test. If sparks occur, reconnect original module to check if it is faulty. Repeat test. If no sparks, replace module.
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