Connect NGS scan tool to DLC-2 located under left side of instrument panel, left of steering column. See Fig 1. Ensure idle speed is correct. See IDLE SPEED & MIXTURE .
Connect timing light to high-tension lead No. 1 and check timing. See Fig 3. See IGNITION TIMING SPECIFICATIONS table. If ignition timing is not within specification, check CMP sensor, CKP sensor, TP sensor, ECT sensor, neutral switch, clutch switch and transmission range switch. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If all sensors and switches are okay, replace PCM.

IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)

Application

Man. Trans.

⁽¹⁾ Auto. Trans.

B2300, B2500 & B3000

10 @ Idle

B4000

N/A

Miata ⁽²⁾

9-11@ 750-850

Millenia ⁽²⁾

2.3L

N/A

6-8 @ 600-700

2.5L

N/A

9-11 @ 600-700

MPV ⁽²⁾

N/A

4-16 @ 700-800

Protege ⁽²⁾

9-11 @ 650-750

Tribute

8-12 @ Idle

626

2.0L

6-18 @ 550-850

2.5L

4-16 @ 550-750

⁽¹⁾	Place automatic transmission in Park.

⁽²⁾	Connect a jumper wire between terminals TEN and GND of data link connector. See Fig 2.

Fig 1: Locating Data Link Connector 2 (Typical)

Courtesy of MAZDA MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Ignition Timing: 626