Code 12, 13 - Rpm Signal

WARNING: This page is about a different car, the 1993 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.

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.

NOTE: Diagnostic chart not available from manufacturer.