P1310

P1310 on a Toyota is a Toyota-specific igniter circuit fault — the ECM sends an IGT (ignition timing) command pulse to each coil/igniter on a dedicated wire, and the igniter answers back with an IGF (ignition confirmation) feedback pulse to prove the coil actually fired. When the ECM doesn't see the expected IGF pattern within its window, it sets P1310 (or its sibling codes P1300-P1305 on older platforms) and disables fuel to the affected cylinder. The cheapest-first ladder starts with a scope or LED test-light on the IGT wire at the coil connector with the key on and cranking: you should see a clean 0/5V square wave at crank speed (one pulse per firing event). No pulse = open IGT wire back to the ECM or a failed ECM driver. Clean pulse but no spark = bad coil-on-plug or external igniter (on pre-2003 platforms with a discrete igniter module). Spark present but P1310 keeps setting = broken IGF feedback wire from igniter to ECM, which is the cheapest common failure on 1996-2002 Camry/Avalon. Don't replace the ECM before checking for a broken IGF return wire near the firewall pass-through — Toyota ECMs almost never fail on this code, but the IGF wire chafes against the cylinder head bracket on 2AZ-FE and 1MZ-FE platforms and mimics an ECM-driver failure for the price of a $0.50 splice.

Vehicle-specific patterns: 1997-2001 Camry / Solara 2.2 (5S-FE) and 3.0 (1MZ-FE) with the external igniter module mounted to the inner fender or near the coil pack throws P1310 from a corroded igniter ground stud and from heat-cooked igniter internals — the module is $80-150 and a 15-minute swap. 2003-2008 Tacoma 2.7L (2TR-FE) and 4.0L (1GR-FE) commonly throws P1310 from a single failed COP coil whose IGF feedback drops out under load — swap-test against an adjacent cylinder before condemning. 2000-2007 Tundra/Sequoia 4.7L (2UZ-FE) with the wasted-spark coil-on-plug setup throws P1310 from coil-boot carbon tracking and from the well-known #5/#7 rear-bank coils failing first under heat soak. 2001-2010 Lexus IS300/GS300/LS430 throws P1310 from the same COP failure pattern plus from worn ECM connector pins at C24 — backprobe before pulling the ECM. Estimated repair: $60 to $450.