Ignition Timing Control Inspection

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Start the engine and run it at idle.
Warm up the engine to normal operating temperature.
Connect the WDS or equivalent to the DLC-2.

Fig 1: Locating DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.
Select the PID/DATA MONITOR AND RECORD function on the WDS or equivalent display.
Select the SPARKADV PID.
Verify that SPARKADV PID is within the specification.
Specification

Approx. BTDC 10°
Increase the engine speed and verify that the SPARKADV PID value is advanced.
- If it is not advanced, inspect the following:
  - CKP sensor and related harness (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION .)
  - MAF sensor and related harness (See MASS AIR FLOW (MAF) SENSOR INSPECTION .)
  - CMP sensors (left and right bank) and related harness (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION