Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Read value using intelligent tester (starter signal)

  5. Inspect park/neutral position switch or clutch start switch

  6. Replace park/neutral position switch or clutch start switch

  7. Read value using intelligent tester (starter signal)

  8. Inspect ignition or starter switch assembly

  9. Replace ignition or starter switch assembly

  10. Read value using intelligent tester (starter signal)

  11. Repair or replace harness or connector (pnp switch or clutch start switch - sta terminal of ecm)

  12. Check whether dtc output recurs (dtc p0617)

DTC P0617 Starter Relay Circuit High


​

DESCRIPTION

The cranking holding control system provides a current to the starter when the ECM detects the ignition switch's start signal (STSW). When the ECM judges that the engine has started, the system cuts the current to the starter. When the ECM receives the STSW signal, it turns on the ACC (Accessory) relay, which prevents flickering of the combination meter, clock and audio system. Also, the ECM sends a signal to the ECM's STAR terminal. Then the STAR output signal travels through the Park/Neutral Position (PNP) switch to the ST relay, causing the starter to activate. When the engine is cranking, the starter operation signal is sent to the ECM's STA terminal.

(a) Vehicle speed more than 20 km/h (12.4 mph) Yaris

While the engine is being cranked, the positive battery voltage is applied to terminal STA of the ECM.
If the ECM detects the Starter Control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The ECM then illuminates the MIL and sets the DTC.
This monitor runs when the vehicle is driven at 20 km/h (12.4 mph) for over 20 seconds.

DTC No.
DTC Detection Conditions
Trouble Areas
P0617
When conditions (a), (b) and (c) met for 20 seconds (1 trip detection logic):
  1. (a) Vehicle speed more than 20 km/h (12.4 mph)
  2. (b) Engine speed more than 1,000 rpm
  3. (c) STA signal ON
  1. Park/Neutral Position (PNP) switch (A/T*)
  2. Clutch start switch (M/T*)
  3. Starter relay circuit
  4. Ignition switch
  5. ECM
*: A/T denotes Automatic Transaxle models and M/T denotes Manual Transaxle models.

WIRING DIAGRAM


The following troubleshooting flowchart is based on the premise that the engine is cranked normally.If the engine will not crank, proceed to the problem symptoms table (Click here). Yaris


INSPECTION PROCEDURE

HINT:
  1. The following troubleshooting flowchart is based on the premise that the engine is cranked normally.
    If the engine will not crank, proceed to the problem symptoms table (Click here).
  2. Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. 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.
1.READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Read the value displayed on the tester when the ignition switch is turned to ON and the engine starts.

    OK:
    Conditions
    		Starter Signal
    Ignition switch to ON
    		OFF
    Engine start
    		ON


OKnext
CHECK FOR INTERMITTENT PROBLEMS (Click here)
NG
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2.INSPECT PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH
  1. Inspect the Park/Neutral Position (PNP) switch (for A/T models).Disconnect the C27 PNP switch connector.Check the resistance when the transmission gear selector lever is moved to each position.Standard resistance:Gear SelectorLever PositionsTester ConnectionsSpecified ConditionsP2 - 6, 4 - 5Below 1 ΩR1 - 2 N2 - 9, 4 - 5 D2 - 7 22 - 3 L2 - 8 Reconnect the PNP switch connector. Yaris

  2. Inspect the Park/Neutral Position (PNP) switch (for A/T models).

    1. Disconnect the C27 PNP switch connector.

    2. Check the resistance when the transmission gear selector lever is moved to each position.

      Standard resistance:
      Gear Selector
      Lever Positions
      		Tester Connections
      		Specified Conditions
      P
      		2 - 6, 4 - 5
      		Below 1 Ω
      R
      		1 - 2
      N
      		2 - 9, 4 - 5
      D
      		2 - 7
      2
      		2 - 3
      L
      		2 - 8

    3. Reconnect the PNP switch connector.

  1. Inspect the clutch start switch (for M/T models).Disconnect the A16 clutch start switch connector.Check the resistance when the clutch start switch is ON and OFF.Standard resistance:Switch PositionsTester ConnectionsSpecified ConditionsON (pushed)1 - 2Below 1 ΩOFF (free)1 - 210 kΩ or higherReconnect the clutch start switch connector. Yaris

  2. Inspect the clutch start switch (for M/T models).

    1. Disconnect the A16 clutch start switch connector.

    2. Check the resistance when the clutch start switch is ON and OFF.

      Standard resistance:
      Switch Positions
      		Tester Connections
      		Specified Conditions
      ON (pushed)
      		1 - 2
      		Below 1 Ω
      OFF (free)
      		1 - 2
      		10 kΩ or higher

    3. Reconnect the clutch start switch connector.



OKnext
Go to step 5
NG
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3.REPLACE PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH

NEXT
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4.READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Read the value displayed on the tester when the ignition switch is turned to ON and the engine starts.

    OK:
    Conditions
    		Starter Signal
    Ignition switch to ON
    		OFF
    Engine start
    		ON


OKnext
SYSTEM OK
NG
next down

5.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY
  1. Disconnect the D8 ignition switch connector. Yaris

  2. Disconnect the D8 ignition switch connector.

  1. Check the resistance.

    Standard resistance:
    Ignition Switch Positions
    		Tester Connections
    		Specified Conditions
    LOCK
    		All Terminals
    		10 kΩ or higher
    ACC
    		2 - 4
    		Below 1 Ω
    ON
    		1 - 2, 1 - 4, 2 - 4, 5 - 6
    START
    		1 - 3, 1 - 4, 3 - 4, 5 - 6, 5 - 7, 6 - 7

  1. Reconnect the ignition switch connector.



OKnext
Go to step 7
NG
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6.REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

NEXT
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7.READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Read the value displayed on the tester when the ignition switch is turned to ON and the engine starts.

    OK:
    Conditions
    		Starter Signal
    Ignition switch to ON
    		OFF
    Engine start
    		ON


OKnext
SYSTEM OK
NG
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8.REPAIR OR REPLACE HARNESS OR CONNECTOR (PNP SWITCH OR CLUTCH START SWITCH - STA TERMINAL OF ECM)

NEXT
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9.CHECK WHETHER DTC OUTPUT RECURS (DTC P0617)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear DTCs (Click here).

  1. Drive the vehicle at more than 20 km/h (12.4 mph) for over 20 seconds.

  1. Select the following menu items: Powertrain / Engine and ECT/ DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed To
    P0617
    		A
    No DTC
    		B


Bnext
SYSTEM OK
A
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REPLACE ECM (Click here)