When making measurements on a wiring harness, both a visual inspection and a continuity test should be performed. Inspect terminal connector pins for damage and corrosion, when directed to remove a connector.

Spark timing adjustments are not possible. Timing is controlled by the EDIS module with input from the ECA.
When checking voltage drop to GROUND, circuit must have a voltage drop of less than one volt.
Battery voltage (VBAT) is any voltage reading within 2 volts of actual battery voltage.
Spark timing will vary at idle due to feedback spark strategy used to control idle speed.
DO NOT connect positive lead of EDIS diagnostic cable to battery or connect cable to VR sensor until directed to.
SAW and IDM signal detectors in EDIS diagnostic cable will not work unless diagnostic cable battery leads are connected to battery.
When using DVOM to measure DC voltage always connect positive lead to BOB terminal A(+) and negative lead to A(-).

CAUTION: DO NOT use a 12-volt incandescent (high voltage) test light to test circuit signals, as it will load the circuit and may cause incorrect measurements or faulty EDIS/ECA operations (engine stall).

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.

Safety Warning

Diagnostic Aids

Use the Manual With the Right Hardware

When to See a Mechanic