Test 3 Or Code 12 - Ignition & Rpm Signal

Code 12 is caused by loss of "NE" signal from distributor to ECU for at least 2 seconds after starter signal is received at ECU. Ensure starter signal exists at ECU. See Code 43. Code 13 is caused by loss of "NE" signal from distributor to ECU when engine RPM exceeds 1500 RPM.

NOTE: For ignition system test procedures, see BASIC TESTING article.

Fig 1: Test 3 or Code 12 Diagram & Flow Chart