No Start After Yaris 1ZZ Coil Swap on ECU Master Black - Base Timing Correction

Electricaladvanced✓ OP Confirmed

Problem

After swapping from IS300 coils to Yaris (1ZZ) coils on a 2JZ-GTE with ECU Master Black standalone ECU, the engine cranked but would not start despite having confirmed spark on all cylinders and correct firing order configuration.

Engine cranks but will not startAll coils confirmed to have spark via output testFiring order set to 1-5-3-6-2-4 and dwell timing configured for 1ZZ coilsCar previously ran fine on IS300 coils with base map

Root Cause

The ignition base timing was significantly off after switching coil packs. The different coil hardware (Yaris 1ZZ vs IS300) required recalibration of the base timing in the ECU Master Black to properly synchronize spark events with engine position.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted April 2023 on SupraForums.com