MIATA, MILLENIA, MPV, Protege & Protege5

Connect NGS scan tool to DLC-2 located under left side of instrument panel. See Figure and Figure . Connect a jumper wire between terminals TEN and GND at DLC-1 in engine compartment. See Figure .
Ensure idle speed is correct. See IDLE SPEED under IDLE SPEED & MIXTURE. On all models except Millenia 2.3L, connect timing light to high-tension lead No. 1. On Millenia 2.3L, connect Inductive Timing Light (49-T018-002) lead (with arrow on lead facing connector) to ignition timing checking harness (Black/White wire) located next to engine compartment fuse/relay box. See Fig 1 . Start engine and allow it to idle. Check timing. See IGNITION TIMING SPECIFICATIONS table. See Figure .

Fig 1: Identifying Ignition Timing Checking Harness
Courtesy of MAZDA MOTORS CORP.

NOTE: Standard inductive timing light may not work on ignition timing checking harness. Recommend using manufacturers Inductive Timing Light (49-T018-002) or equivalent
On all models except Millenia 2.5L, if ignition timing is not within specification, check CMP, CKP, TP and ECT sensors and transmission range switch. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If all sensors and switches are okay, replace PCM.
On Millenia 2.5L, if ignition timing is not within specification, loosen distributor lock bolt. Rotate distributor until timing marks align. Tighten lock bolt. Recheck timing.