Code 12, 13 - Rpm Signal

Code 12 is caused by loss of "G2", "G1", or "NE" signal (3S-GTE), or no "G" or "NE" signal (all others), from distributor to ECM for at least 2 seconds after starter signal is received at ECM. Check distributor and ignition system components. See the article SYSTEM/COMPONENT TESTS in this section. Ensure starter signal exists at ECM. See CODE 43/TEST 10 - STARTER SIGNAL  test procedures in this article.

Code 13 is caused by loss of "NE" signal from distributor to ECM when engine RPM exceeds 1000-1500 RPM. Check for open or short in distributor wiring to ECM. Check distributor and ignition system components. See SYSTEM/COMPONENT TESTS article.

Code 12 is caused by loss of signal "G2", "G1", or "NE" (3S-GTE) or "G" or "NE" (all others) from distributor to ECM for at least 2 seconds after starter signal is received at ECM. Ensure starter signal exists at ECM. See CODE 43/TEST 10 - STARTER SIGNAL  test procedures in this article.

Code 13 is caused by loss of "NE" signal from distributor to ECM when engine RPM exceeds 1000 RPM.