Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA1991NAVAJO LX, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSCHECK PROFILE IGNITION PICKUP (PIP) AT EDIS MODULE (NAVAJO)
1991 Mazda Navajo LX, Automatic
Check Profile Ignition Pickup (Pip) At EDIS Module (NAVAJO)
1991 Mazda Navajo LX, AutomaticSECTION Check Profile Ignition Pickup (Pip) At EDIS Module (NAVAJO)
- Turn key off. Connect EDIS Diagnostic Cable (007-00059) to breakout box (T83L-50-EEC-IV), EDIS module and coil pack. DO NOT connect Crankshaft (VRS) sensor tee. See Fig 1 . Use EDIS No. 6 overlay.
- Connect EDIS diagnostic cable negative lead to battery, leaving positive lead disconnected. Set EDIS diagnostic cable box to 4/6 CYLINDER position. Connect LED test light leads between breakout box pins No. J43 (PIP E) and J7 (ground). Crank engine. If LED test light blinks, go to step 3). If test light does not blink, go to ISOLATE EDIS MODULE/PIP FAULT (NAVAJO).
- Turn key off. Disconnect ECA. Check continuity of PIP and Ignition Ground (IGND) wires between EDIS and ECA. If any problems are found, repair circuits and components. Clear Continuous Memory, and run QUICK TEST in appropriate G - TEST W/ CODES article in the ENGINE PERFORMANCE section. If continuity is present and wires are not shorted or open, replace EDIS module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.