Check VRS Resistance

Turn key off and disconnect PCM. Connect negative lead of ICM diagnostic cable to negative battery terminal. Set DVOM to 20-k/ohm scale. Measure resistance between breakout box pins No. J48 (VRS

See Fig 1 . If resistance is 2580-2700 ohms, go to VRS SENSOR. If resistance is not 2580-2700 ohms, repair wires between VRS and ICM or replace VRS.

Fig 1: Electronic Distributorless Ignition Control Module (ICM) Test Schematic (Navajo)

Courtesy of MAZDA MOTORS CORP.