LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2000 >> Sienna LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P1300: IGNITOR Circuit >> Diagnosis & Repair
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnosis & Repair

  1. Check for spark at misfiring cylinder. See IGNITION SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article. If spark is exists, go to next step. If spark is not exist, go to step  4.
  2. Check for open or short in White/Red wire between terminal No. 25 at ECM harness connector E12 and ignitor. See Figure. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  3. Disconnect Black 10-pin ignitor harness connector. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe at ECM harness connector and measure voltage between ground and terminal No. 25 (White/Red wire) at ECM harness connector E12. See Figure. If voltage is 4.5-5.5 volts, replace ignitor. If voltage is not 4.5-5.5 volts, replace ECM.
  4. Check for open or short in IGT1, IGT2 and IGT3 circuits between ECM and ignitor. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  5. Access ECM behind glove box. Using DVOM, backprobe ECM connector and measure voltage between ground and terminals No. 11 (Gray wire), No. 12 (Brown/Yellow wire) and No. 13 (Light Green/Black wire) at ECM harness connector E12 while cranking engine. See Figure. If all readings are .1-4.5 volts, go to next step. If any reading is not .1-4.5 volts, replace ECM.
  6. Disconnect Black 10-pin ignitor harness connector. Using DVOM, backprobe ECM harness connector and measure voltage between ground and terminals No. 11 (Gray wire), No. 12 (Brown/Yellow wire) and No. 13 (Light Green/Black wire) at ECM harness connector E12 while cranking engine. If all readings are .1-4.5 volts, go to next step. If any reading is not .1-4.5 volts, replace ECM.
  7. Turn ignition on. Measure voltage between ground and terminal No. 9 (Black/Red wire) at ignitor harness connector. See Fig 1. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, check and repair ignitor power source circuit. See WIRING DIAGRAMS article.
  8. Check for open or short in wiring between ignition switch and ignition coil, and between ignition coil and ignitor. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  9. Check ignition coil. See IGNITION SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article. If problem exists, replace ignition coil. If problem does not exist, go to next step.
  10. Check EFI main relay. See MOTORS & RELAYS in SYSTEM & COMPONENT TESTING - V6 & V8 article. If problem exists, replace EFI main relay. If problem does not exist, go to next step.
  11. Check ignition ground circuit. If problem exists, repair as necessary. If problem does not exist, replace ignitor.
Fig 1: Identifying Ignitor Harness Connector Terminals
G95C31387Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals