Pinpoint Tests: Notes

NOTE: Before testing Electronic Distributorless Ignition System (EDIS), ensure all tests in BASIC TESTING and appropriate G - TESTS W/ CODES articles in the ENGINE PERFORMANCE section have been performed. In following tests, Electronic Distributorless Ignition System (EDIS) or Ignition Control Module (ICM) may be used to describe ignition system.

TESTS W/CODES (for B4000)
TESTS W/CODES (for Navajo)

NOTE: Use EDIS Diagnostic Cable (49-UN01-057) to diagnose system. Cable is equipped with additional circuits and components to enhance and modify signals for testing purposes. If using an aftermarket test cable or DVOM, become familiar with system wiring diagram and system operation. See Fig 1 and Fig 2 .

Fig 1: Ignition System Wiring Diagram (B4000 & Navajo)

Courtesy of MAZDA MOTORS CORP.

Fig 2: EDIS/ICM Diagnostic Cable Diagram (B4000 & Navajo)

Courtesy of MAZDA MOTORS CORP.

CAUTION: Unless directed otherwise, DO NOT connect PCM to breakout Box (BOB) when performing ICM diagnostics.