Ignition Timing Inspection

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

Perform ENGINE TUNE-UP PREPARATION .
Verify that the idle speed is within the specification.
- If not as specified, adjust the idle speed. See IDLE SPEED ADJUSTMENT .
Specification

550-750 (650 +/- 100) RPM
Connect a timing light to the high-tension lead of the No.1 cylinder.
Verify that the timing mark (yellow) is within the specification.
- If not as specified, inspect the following.
  1. Camshaft Position Sensor
  2. Crankshaft Position Sensor
  3. Throttle Position Sensor
  4. Engine Coolant Temperature Sensor
  5. Neutral Switch (MTX)
  6. Clutch Switch (MTX)
  7. Transaxle Range Switch (ATX)
- If the devices are normal, replace the PCM.
  
  Fig 1: Checking Ignition Timing
  Courtesy of MAZDA MOTORS CORP.
Specification

BTDC 4-16 (10 +/- 6)/550-750 RPM