Trailing Side Ignitor

Disconnect 2-prong connector at ignitor. Connect voltmeter between (in series) disconnected 2-prong connector. See Fig 1 . Turn ignition on and note voltage.
Voltage should be about 12 volts. Turn ignition off. Remove voltmeter and negative battery cable. Reconnect 2-prong connector. Disconnect 4-prong connector.

Fig 1: Testing RX7 Trailing Side Ignitor
Courtesy of MAZDA MOTORS CORP.
Install Ignitor Checker (49 F018 002) between 4-prong connectors. Disconnect Black and Blue wires from coil. Install negative battery cable.
CAUTION: Ensure negative battery cable is disconnected prior to removing Black and Blue wires from coil. DO NOT disconnect Brown wire from coil. Ensure ohmmeter leads are installed with "+" lead to ground and "-" lead to Black wire.
Install ohmmeter between BLK wire and ground. See Fig 2 . Place ignitor checker "SW1" switch to the "T1" position. Hold ignitor checker "SW2" switch on and note ohmmeter reading. Ohmmeter needle should rise to 1/3rd the distance of the scale and then return. Replace ignitor if needle operation was incorrect.

Fig 2: Testing RX7 Trailing Side Ignitor
Courtesy of MAZDA MOTORS CORP.
Turn ignition off. Disconnect ohmmeter and reconnect "+" lead to ground and "-" lead to Blue wire.
CAUTION: Ensure ohmmeter is installed with "+" lead to ground and "-" lead to BLU wire. DO NOT reverse leads or damage may result.
Turn ignition on. Place ignitor checker "SW1" switch to the "T2" position. Hold ignitor checker "SW2" switch on and note ohmmeter reading. Ohmmeter needle should rise to 1/3rd the distance of the scale and then return. Replace ignitor if needle operation was incorrect.