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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1300, DTC P1305, DTC P1310, DTC P1315, DTC P1320 &/Or DTC P1325 >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Procedure below is for No. 1 cylinder. If a malfunction is found on other cylinders, check circuit for that particular cylinder.
  1. Check spark plugs. If spark plugs are okay, go to next step. If spark plugs are not okay, replace spark plugs and go to step  4.
  2. Disconnect ignition coil connector. Disconnect ECM E10 connector. Check for open circuit between ECM connector E10 terminal No. 23 (White/Red wire) and White/Red wire at ignition coil connector terminal No. 2. See Figure. Check for short circuit between ECM connector E10 terminal No. 23 (White/Red wire) and terminal No. 28 (Brown wire). See Figure. Repair wiring as necessary. If wiring is okay, go to next step.
  3. Reconnect ECM E10 connector. Disconnect ignition coil connector. Turn ignition on. Measure voltage (backprobe) between ECM E10 connector terminal No. 23 (White/Red wire) and No. 28 (Brown wire). See Figure. If voltage is 4.5-5.5 volts, replace igniter. If voltage is not 4.5-5.5 volts, check for open or short in White/Red wire between terminal No. 25 at ECM harness connector E11 and ignitor. Ignitor is located near left shock tower. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  4. Disconnect Black, 4-pin ignition coil harness connector. Access ECM behind glove box. Disconnect ECM E10 connector. Using DVOM, backprobe at ECM E10 harness connector terminals No. 8 (Red/White wire) and ignition coil connector. See Figure. Resistance should be one ohm or less. Check for short circuit between ECM connector E10 terminals No. 8 (Red/White wire) and No. 28 (Brown wire). Resistance should be one megohm or less. If resistances are to specification, go to next step. If resistances are not to specification, repair or replace harness and connector.
  5. Access ECM behind glove box. Using DVOM, backprobe between ECM harness connector E10 terminal No. 28 (Brown wire) and terminals No. 8 (Red/White wire), No. 9 (Pink wire), No. 10 (Light Green/Black wire), No. 11 (Blue/Yellow wire), No. 12 (Green/Red wire) and No. 13 (Blue wire) while cranking engine. See Figure. If any readings are not .1-4.5 volts, replace ECM. If all readings are .1-4.5 volts, go to next step.
  6. Disconnect Black 4-pin ignition coil harness connector. Turn ignition on. Measure voltage between terminals No. 1 and 4 at ignition coil connector. 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.
  7. Check for open or short in wiring between ignition switch and ignition coils, and between ignition coil and ignitor. If problem exists, repair wiring as necessary. If problem does not exist, replace ignition coil assembly.
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