Control Unit
- Check condition of 5-amp fuse, which is located under terminal connectors.
- Referring to Fig 1 for terminal locations, check that current flows to terminals "A" and "B" when engine is operating at idle (about 3-8 volts).
- Connect negative probe of voltmeter to terminal "P" and positive probe to other terminals as described below and check that 12 volts exist under conditions described:
- At terminal "J" with decreasing engine speed less than 1150 RPM.
- At terminal "J" with engine operating and applying battery power (with jumper wire) to terminal "E" or "T".
- At terminal "L" with decreasing engine speed less than 1150 RPM.
- At terminal "M" or "Q" when applying battery power to terminal "S", engine speed should increase less than 4600 RPM of idle within 130 seconds after engine start with choke knob fully out.
- At terminal "M" when applying battery power to terminal "E" and engine operating.
- At terminal "D" at any engine operating condition.
- At terminal "R" while applying battery power to terminal "S" with engine speed increasing less than 3000 RPM of idle.
- At terminal "R" while applying battery power to terminal "S" at engine speed less than 4600 RPM within 130 seconds after starting engine with choke knob fully out.
- At terminal "G" or "I" with decreasing engine speed more than 1150 RPM.
- At terminal "U" at any engine operating condition (Calif.). When ignition switch is "ON" and/or within 60 seconds after starting engine with choke knob fully out with engine operating or stalled (Federal).
- At terminal "V" (Calif. only) while applying battery power to terminal "S" at engine speed less than 4600 RPM within 130 seconds after starting engine with choke knob fully out.
- At terminal "V" (Calif. only) while applying battery power to terminal "F" or "O" at any engine operating condition.
- At terminal "F" or "H" with decreasing engine speed less than 1150 RPM.
- At terminal "K" at any engine operating condition.
Courtesy of MAZDA MOTORS CORP.