Toyota Yaris: Sfi System / Crankshaft Position Sensor "A" Circuit Short to Ground (P033511,P033515)

• Reference: Inspection using an oscilloscope.

  HINT:

  The correct waveform is as shown.

  ECM Terminal Name	Between NE+ and NE-
  Tester Range	2 V/DIV., 20 ms./DIV.
  Condition	Idling with warm engine

1. Connect the GTS to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the GTS on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch to ON.
7. Turn the GTS on.
8. Start the engine.
9. Idle the engine for 20 seconds or more.
10. Enter the following menus: Powertrain / Engine / Trouble Codes.
11. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P033511 or P033515.
14. Check the DTC judgment result.

    GTS Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.

HINT:

• The engine speed can be checked by using the GTS. To perform the check, follow the procedures below:
  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS on.
  4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
  5. Start the engine.
  • The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.
• Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

HINT:

• To check the engine speed change, display the graph on the GTS.
• If the engine does not start, check the engine speed while cranking.
• If the engine speed indicated on the GTS remains at zero (0), there may be an open or short in the crankshaft position sensor circuit.

Crankshaft Position Sensor "A" No Signal (sub) (P033500)

DESCRIPTION Refer to DTC P033511. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note P033500 Crankshaft Position Sensor "A" No Signal (sub) No crankshaft position sensor signal to the sub ECM while engine running ECM Comes on SAE: P0335 MONITOR DESCRIPTION While the engine is running, when the NE signal is not input to the sub CPU even though the NE signal is input to the main CPU, the ECM judges that a malfunction has occurred in an internal ECM circuit, and illuminates the MIL and stores a DTC...

Crankshaft Position Sensor "A" Circuit Intermittent (P03351F,P03352A,P033531)

DESCRIPTION Refer to DTC P033511. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note P03351F Crankshaft Position Sensor "A" Circuit Intermittent Under conditions (a), (b) and (c), no crankshaft position sensor signal to ECM for 0...

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