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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (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 RX 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for spark at misfiring cylinder. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article. If spark is present, go to next step. If spark is not present, go to step  4.
  2. Check for open or short in IGF and IGT circuits between ECM E9 connector and suspect ignition coil/ignitor. See WIRING DIAGRAMS article. Repair as necessary. If circuits are okay, go to next step.
  3. Disconnect Black 4-pin connector at suspect ignition coil/ignitor. Turn ignition on. Backprobing connector, measure voltage between ground and terminal No. 25 (Black wire) at ECM E9 connector. See Figure. If voltage is 4.5-5.5 volts, replace suspect ignition coil/ignitor. If voltage is not 4.5-5.5 volts, replace ECM and retest.
  4. Check for open or short in suspect IGT circuit between ECM E9 connector and suspect ignition coil/ignitor. See WIRING DIAGRAMS article. Repair as necessary. If circuit is okay, go to next step.
  5. Backprobing connector, measure voltage between ground and suspect IGT circuit terminal at ECM E9 connector while cranking engine. See IDENTIFYING IGT CIRCUIT ECM E9 CONNECTOR TERMINALS  table. If voltage is .1-4.5 volts, go to next step. If voltage is not .1-4.5 volts, replace ECM and retest.
    IDENTIFYING IGT CIRCUIT ECM E9 CONNECTOR TERMINALS

    Ignition Coil/Ignitor No. Circuit (Terminal No.) Wire Color
    1 IGT1 (11) Black/Yellow
    2 IGT2 (12) Blue/Red
    3 IGT3 (13) Yellow/Green
    4 IGT4 (14) Blue/Yellow
    5 IGT5 (15) Yellow
    6 IGT6 (16) Green/Black
  6. Disconnect all ignition coil/ignitor connectors. Backprobing connector, measure voltage between ground and each IGT circuit terminal of ECM E9 connector while cranking engine. See IDENTIFYING IGT CIRCUIT ECM E9 CONNECTOR TERMINALS  table. If voltage is .1-4.5 volts, go to next step. If voltage is not .1-4.5 volts, replace ECM and retest.
  7. Ensure suspect ignition coil/ignitor connector is disconnected. Measure voltage between ground and suspect coil/ignitor harness connector terminal No. 1 (White/Red wire). Turn ignition switch to ON, then to START position. If voltage is not 9-14 volts, go to next step. If voltage is 9-14 volts, check for open circuit in White/Black wire between suspect ignition coil/ignitor connector terminal No. 4 and ground. Repair as necessary.
  8. Check for open or short in wire harness and connector between ignition switch and suspect ignition coil/ignitor. See WIRING DIAGRAMS article. Repair as necessary. If circuit is okay, go to next step.
  9. Check EFI main relay. See SYSTEM & COMPONENT TESTING - ES300 & RX300 article. EFI main relay is located in underhood engine compartment at left side of engine. Replace as necessary. If EFI main relay is okay, replace suspect ignition coil/ignitor.
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