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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0300, DTC P0301, DTC P0302, DTC P0303, DTC P0304, DTC P0305, DTC P0306, DTC P0307 Or DTC P0308 >> Diagnosis & Repair (Using Hand-Held Tester)

Diagnosis & Repair (Using Hand-Held Tester)

WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for DTC output besides P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308. Go to relevant DTC test as necessary. If no other DTCs are present, go to next step.
  2. Check connection of wire harness and connector. Check for disconnection of piping or a break in vacuum hose. Repair as necessary. If okay, go to next step.
  3. Check PCV hose connection. If problem exists, repair as necessary. If problem does not exist, go to next step.
  4. Start the engine. Read misfire on hand-held tester. If misfire is on 1-2 cylinders, go to next step. If misfire is on more than 3 cylinders, go to step  15.
  5. Remove the spark plug. Check the spark plug type and electrode gap. Gap should be 0.039-0.043" (1.0-1.1 mm), with a maximum of .051" (1.3 mm). Replace plug as necessary. Check spark by disconnecting injector connector. Install spark plug to ignition coil. Ground the spark plug. If spark jumps across electrode gap while engine is being cranked, go to step  8. If spark does not jump, go to next step.
  6. Remove the spark plug. Change spark plug. Perform a spark test. Disconnect the injector connector. Install the spark plug to ignition coil. Ground the spark plug. Check that spark jumps across electrode gap while the engine is being cranked. Do not crank engine for more than 5-10 seconds. If spark jumps across electrode gap while engine is being cranked, replace spark plug. If spark does not jump, go to next step.
  7. Check the wire harness between ignition coil and ECM (IF terminal) connectors. Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil connector. Disconnect the ECM E4 connector. See Fig 1 and Fig 2 . Check the continuity between the wire harness side connectors. See ECM/IF SIGNAL TERMINAL CONTINUITY CHECK  table. Disconnect the E2 or E4 ECM connector. See Fig 3. Check the continuity between the wire harness side connectors. See ECM/IGT SIGNAL TERMINAL CONTINUITY CHECK  table. If all checks are okay, replace ignition coil assembly. If all checks are not okay, repair or replace harness and connector as necessary.
    Fig 1: Identifying Ignition Coil Connector Terminals
    G00239968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying ECM Connector E4 Terminals
    G00239969Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Identifying ECM E2 & E4 Connector Terminals
    G00239970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECM/IF SIGNAL TERMINAL CONTINUITY CHECK

    Terminals No. Specification
    (I1-2) - IF1L (E4-6) Continuity
    (I2-2) - IF2R (E4-5) Continuity
    (I3-2) - IF2L (E4-4) Continuity
    (I4-2) - IF1R (E4-7) Continuity
    (I5-2) - IF2L (E4-4) Continuity
    (I6-2) - IF1R (E4-7) Continuity
    (I7-2) - IF1L (E4-6) Continuity
    (I8-2) - IF2R (E4-5) Continuity
    (I1-2) Or IF1L (E4-6) - E1 (E3-7) No Continuity
    (I2-2) Or IF2R (E4-5) - E1 (E3-7) No Continuity
    (I3-2) Or IF2L (E4-4) - E1 (E3-7) No Continuity
    (I4-2) Or IF1R (E4-7) - E1 (E3-7) No Continuity
    (I5-2) Or IF2L (E4-4) - E1 (E3-7) No Continuity
    (I6-2) Or IF1R (E4-7) - E1 (E3-7) No Continuity
    (I7-2) Or IF1L (E4-6) - E1 (E3-7) No Continuity
    (I8-2) Or IF2R (E4-5) - E1 (E3-7) No Continuity
    ECM/IGT SIGNAL TERMINAL CONTINUITY CHECK

    Terminals No. Specification
    (I1-3) - IGT1 (E2-17) Continuity
    (I2-3) - IGT2 (E4-13) Continuity
    (I3-3) - IGT3 (E2-16) Continuity
    (I4-3) - IGT4 (E4-12) Continuity
    (15-3) - IGT5 (E2-27) Continuity
    (I6-3) - IGT6 (E4-11) Continuity
    (I7-3) - IGT7 (E2-26) Continuity
    (I8-3) - IGT8 (E4-10) Continuity
    (I1-3) Or IGT1 (E2-17) - E1 (E3-7) No Continuity
    (I2-3) Or IGT2 (E4-13) - E1 (E3-7) No Continuity
    (I3-3) Or IGT3 (E2-16) - E1 (E3-7) No Continuity
    (I4-3) Or IGT4 (E4-12) - E1 (E3-7) No Continuity
    (I5-3) Or IGT5 (E2-27) - E1 (E3-7) No Continuity
    (I6-3) Or IGT6 (E4-11) - E1 (E3-7) No Continuity
    (I7-3) Or IGT7 (E2-26) - E1 (E3-7) No Continuity
    (I8-3) Or IGT8 (E4-10) - E1 (E3-7) No Continuity
  8. Turn the ignition switch ON. Measure the voltage between the terminals of the E2, E3 and E4 connectors. See Fig 4. See ECM E2, E3 & E4 CONNECTOR VOLTAGE CHECK  table. If okay, go to step  10. If not okay, go to next step.
    Fig 4: Identifying ECM Connector E2, E3 & E4 Terminals
    G00239971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECM E2, E3 & E4 CONNECTOR VOLTAGE CHECK

    Terminals No. Specification
    No. 1 (E2-15) - E1 (E3-7) 9-14 Volts
    No. 2 (E4-17) - E1 (E3-7) 9-14 Volts
    No. 3 (E2-14) - E1 (E3-7) 9-14 Volts
    No. 4 (E4-16) - E1 (E3-7) 9-14 Volts
    No. 5 (E2-13) - E1 (E3-7) 9-14 Volts
    No. 6 (E4-15) - E1 (E3-7) 9-14 Volts
    No. 7 (E2-12) - E1 (E3-7) 9-14 Volts
    No. 8 (E4-14) - E1 (E3-7) 9-14 Volts
  9. Check fuel injectors. Injector volume should be 3.7-4.5 cu. in. per 15 seconds. Difference between each injector should be .6 cu. in. or less. If problem exists, repair as necessary. If problem does not exist, go to next step.
  10. Disconnect the injector connectors. Disconnect the E2 and E4 ECM connectors. See Fig 5 and Fig 6 . Check the wire harness between the I9, I10, I11, I12, I13, I14, I15 and I16 injector connectors and ECM connectors. Check the continuity between the wire harness side connectors. Check the wire harness between the I9, I10, I11, I12, I13, I14, I15 and I16 injector connectors and IG2 relay. See INJECTOR/ECM CONTINUITY CHECK  table. Remove the INJ fuse from the engine room No. 2 relay block. Check continuity of EFI No. 2 fuse. Disconnect the injector connectors. Remove the IG2 relay from the engine room No. 1 relay block. Check continuity between the wire harness side connectors. See INJECTOR/IG2 RELAY CONTINUITY CHECK  table.
    Fig 5: Identifying Injector Connector
    G00239972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Identifying ECM E2 & E4 Connector Terminals
    G00239973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    INJECTOR/ECM CONTINUITY CHECK

    Terminals No. Specification
    (I9-2) - No. 1 (E2-15) Continuity
    (I10-2) - No. 2 (E4-17) Continuity
    (I11-2) - No. 3 (E2-14) Continuity
    (I12-2) - No. 4 (E4-16) Continuity
    (I13-2) - No. 5 (E2-13) Continuity
    (I14-2) - No. 6 (E4-15) Continuity
    (I15-2) - No. 7 (E2-12) Continuity
    (I16-2) - No. 8 (E4-14) Continuity
    (I9-2) Or No. 1 (E2-15) - E1 (E3-7) No Continuity
    (I10-2) Or No. 2 (E4-17) - E1 (E3-7) No Continuity
    (I11-2) Or No. 3 (E2-14) - E1 (E3-7) No Continuity
    (I12-2) Or No. 4 (E4-16) - E1 (E3-7) No Continuity
    (I13-2) Or No. 5 (E2-13) - E1 (E3-7) No Continuity
    (I14-2) Or No. 6 (E4-15) - E1 (E3-7) No Continuity
    (I15-2) Or No. 7 (E2-12) - E1 (E3-7) No Continuity
    (I16-2) Or No. 8 (E4-14) - E1 (E3-7) No Continuity
    INJECTOR/IG2 RELAY CONTINUITY CHECK

    Terminals No. Specification
    (I9-1 ) - (IG2 Relay Terminal No. 3) Continuity
    (I10-1) - (IG2 Relay Terminal No. 3) Continuity
    (I11-1) - (IG2 Relay Terminal No. 3) Continuity
    (I12-1) - (IG2 Relay Terminal No. 3) Continuity
    (I13-1) - (IG2 Relay Terminal No. 3) Continuity
    (I14-1 ) - (IG2 Relay Terminal No. 3) Continuity
    (I15-1 ) - (IG2 Relay Terminal No. 3) Continuity
    (I16-1 ) - (IG2 Relay Terminal No. 3) Continuity
  11. If using hand-held tester, select the active test mode, and operate fuel pump. If not using hand-held tester, connect positive and negative leads from battery to fuel pump connector. Connect wire to the injector and battery for 15 seconds. See Figure. Measure the injection volume with a graduated cylinder. Test each injector 2-3 times. Injection volume should be 3.7-4.5 cu in. per 15 seconds. Difference between each injector should be 0.6 cu in. or less. If not to specification, repair or replace as necessary. If to specification, go to next step.
  12. Check engine compression. See BASIC DIAGNOSTIC PROCEDURES article. If engine compression is okay, go to next step.
  13. Check valve clearance. See ON-VEHICLE ADJUSTMENTS article. If valve clearance is okay, go to next step.
  14. Read value of hand-held tester. Switch step by number of misfiring cylinder. If high misfire rate is in 1-2 cylinders, go to next step. If high misfire rate is in more than 3 cylinders, check for intermittent problems.
  15. Check valve timing. Check for loose or jumping teeth of timing belt. Repair as necessary. If okay, go to next step.
  16. Check fuel pressure. See FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. Repair as necessary. If okay, go to next step.
  17. Disconnect the mass airflow sensor connector. Measure the resistance between terminals of mass airflow sensor. See AIRFLOW SENSOR RESISTANCE CHECK  table. Reconnect the mass airflow sensor connector. Turn the ignition switch ON. Measure the voltage between terminals No. 2 and 3 of mass airflow sensor when blowing air into the airflow sensor. Figure and Figure . Voltage should fluctuate. If okay, go to next step. If not okay, replace mass airflow sensor.
    AIRFLOW SENSOR RESISTANCE CHECK

    Resistance Temperature
    Terminals No. 4 & 5
    13.6-18.4 k/ohms -4°F (-20°C)
    2.21 -2.69 k/ohms 68°F (20°C)
    0.49- 0.67 k/ohms 140°F (60°C)
  18. Measure the resistance between the terminals of the coolant temperature sensor. See Figure. Replace coolant temperature sensor as necessary. If okay, go to next step.
  19. Read value of hand-held tester. Switch step by number of misfiring cylinder. If high misfire rate is in 1-2 cylinders, check for intermittent problems. If high misfire rate is in more than 3 cylinders, check spark plugs. See step  5.
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