Toyota Yaris: Stop And Start System / Failure to Restart from IG-ON Engine Stall
DESCRIPTION
- This is the troubleshooting procedure for situations where the engine does not restart when attempting to restart it after either a failed engine start occurred under stop and start system control, or a mis-operation during vehicle takeoff resulted in an engine stall.
-
For information on stop and start control, refer to the system description.
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CAUTION / NOTICE / HINT
PRECAUTIONS WHEN THE ENGINE STOP AND START ECU AND THE STARTER ASSEMBLY ARE REPLACED
NOTICE:
-
When the engine stop and start ECU is replaced, it is necessary to read the number of starter operations before replacement and store this number in the new engine stop and start ECU after replacement, and to perform external backup boost converter (eco run vehicle converter assembly) existence learning. Moreover, initialization/learning of the air conditioning information and initialization/learning of the deceleration sensor zero point are also required.
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-
When the engine stop and start ECU or electromagnetic oil pump (oil pump assembly w/ solenoid) has been replaced, it is necessary to check the operation of the electromagnetic oil pump (oil pump assembly w/ solenoid).
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-
When the starter assembly is replaced, the number of starter operations stored in the engine stop and start ECU must be reset.
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- When the starter assembly is replaced, "ST NO. 1 relay" must be also replaced.
- Inspect the fuses for circuits related to this system before performing the following procedure.
PRECAUTIONS FOR FOUR-WHEEL TOWING
Do not tow the vehicle with all 4 wheels on the ground.
NOTICE:
- Towing the vehicle with all 4 wheels on the ground may have a detrimental effect on the stop and start system, and could lead to damage.
HINT:
If it is absolutely necessary to tow the vehicle with all 4 wheels on the ground, before towing first turn the ignition switch off. Then, turn the ignition switch to ON without starting the engine, and tow the vehicle.
PRECAUTIONS WHEN REPLACING ECM
NOTICE:
When the ECM is replaced on a vehicle with a non-specified battery, it is necessary to perform battery type switching.
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PROCEDURE
| 1. | CHECK VEHICLE CONTROL HISTORY (Failure to Restart from IG-ON Engine Stall) |
| Tester Display |
|---|
| Vehicle Control History (RoB) |
(a) Check vehicle control history.
HINT:
- Checking the freeze frame data allows the vehicle conditions at the time of detection to be confirmed.
- As Vehicle Control History may be overwritten whenever the trigger conditions are met, make sure to save the Vehicle Control History data before performing any inspections.
| Result | Proceed to |
|---|---|
| Vehicle control history [X0874: Stop & Start Restart Failure (Engine Restart after Engine Stall)] is output | A |
| Vehicle control history [X0874: Stop & Start Restart Failure (Engine Restart after Engine Stall)] is not output | B |
| B |
 | GO TO SFI SYSTEM (RoB CHART) |
|
| 2. | CHECK VEHICLE CONDITION (DRIVER OPERATION ITEMS) |
| Tester Display |
|---|
| Vehicle Control History (RoB) |
(a) Select the vehicle control history item [X0874: Stop&Start Restart Failure (Engine Restart after Engine Stall)] to display the data from the time of control.
(b) Check the output data, and check whether operations were performed that could result in an MT engine stall.
| Result | Proceed to |
|---|---|
| When failure to restart from Stop and Start occurred, check whether the vehicle was put into "Shift Position" and "Clutch Lower Switch" was released (= incorrect operation). Or, for all recorded points, "Neutral Switch" is "OFF" (= driving range) | A |
| None of the above conditions are met | B |
| A |
 | ENGINE STALL DUE TO DRIVER OPERATION |
|
| 3. | CHECK VEHICLE CONTROL HISTORY (STOP&START RESTART FAILURE (ENGINE RESTART AFTER ENGINE STALL) |
| Tester Display |
|---|
| Vehicle Control History (RoB) |
(a) Select the vehicle control history item [X0874: Stop&Start Restart Failure (Engine Restart after Engine Stall)] to display the data from the time of control.
(b) Check the output data.
| Result | Proceed to |
|---|---|
| All recorded sections "Starter"*1 = OFF, and all recorded sections "Engine Speed" = 0 rpm HINT: It is possible that the starter drive command is not being sent from the engine stop and start ECU. | A |
| "Starter"*1 = ON for any sections, and all recorded sections "Engine Speed" = 0 rpm HINT: It is possible that the drive command is being sent from the engine stop and start ECU but the starter itself is not moving. | B |
| "Engine Speed" > 0 rpm for any sections HINT: It is possible that cranking was achieved but the engine stopped. | C |
- *1: Starter Motor Status in the case of tandem starter.
| A |
 | REPLACE ENGINE STOP AND START ECU |
| C |
 | GO TO STEP 8 |
|
| 4. | CHECK VEHICLE CONTROL HISTORY (CRANKING TIME) |
| Tester Display |
|---|
| Vehicle Control History (RoB) |
(a) Check the vehicle control history item "Cranking Time".
| Result | Proceed to |
|---|---|
| "Cranking Time" is 1.5 seconds or more HINT: It is possible that there is an external malfunction outside of the stop and start ECU (drive circuit). | A |
| "Cranking Time" is less than 1.5 seconds HINT: It is possible that there is a malfunction in the stop and start ECU (drive circuit). | B |
| B |
 | REPLACE ENGINE STOP AND START ECU |
|
| 5. | CHECK ENGINE STOP AND START ECU (+B VOLTAGE) |
(a) Disconnect the A67 engine stop and start ECU connector.
(b) Turn the ignition switch to ON.
(c) Turn off any electrical loads.
(d) Measure the resistance according to the value(s) in the table below.
OK:
11 V or higher
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| A67-1 (+B) - Body ground | Ignition switch ON | 11 V or higher |
| NG |
 | GO TO STEP 7 |
|
| 6. | CHECK VEHICLE CONTROL HISTORY (BATTERY VOLTAGE) |
| Tester Display |
|---|
| Vehicle Control History (RoB) |
(a) Check the voltage of the auxiliary battery.
HINT:
- Depending on RoB detection timing, the minimum voltage from the previous startup will be stored for the Minimum Voltage (Cranking) and the Minimum Voltage (Starter Solenoid Engagement). For the battery condition at the start of the current driving cycle, see Battery Voltage.
- When the value is 20, the value is being calculated.
| Result | Proceed to |
|---|---|
| Auxiliary battery voltage is 8.92 V or more | A |
| Auxiliary battery voltage is less than 8.92 V | B |
| A |
 | INSPECT STARTER SYSTEM |
| B |
 | GO TO STEP 7 |
| 7. | INSPECT AUXILIARY BATTERY |
(a) Measure the voltage of the auxiliary battery.
Standard Voltage:
11 to 14 V
| OK |
 | INSPECT STARTER SYSTEM |
| NG |
 | REPLACE AUXILIARY BATTERY |
| 8. | CHECK VEHICLE CONTROL HISTORY (CRANKING TIME) |
| Tester Display |
|---|
| Vehicle Control History (RoB) |
(a) Select a vehicle control history item to display the "Cranking Time" and "Starter OFF Permission History (ECM)" data from the time of control.
(b) Check the output data.
| Result | Proceed to | |
|---|---|---|
| "Cranking Time" is less than 1.5 seconds | "Starter OFF Permission History (ECM)" is ON HINT: It is possible that the ECM made a judgment of complete combustion and the ECM then stopped the starter. | A |
| "Starter OFF Permission History (ECM)" is OFF HINT: It is possible that the engine stop and start ECU made a judgment of complete combustion and the engine stop and start ECU then stopped the starter. | B | |
| "Cranking Time" is 1.5 seconds or more. | HINT: It is possible that the stop and start ECU did not stop the starter. | C |
| A |
 | SFI SYSTEM (Poor Startability) |
| C |
 | GO TO STEP 13 |
|
| 9. | READ VALUE USING GTS (Engine Speed) |
| Tester Display |
|---|
| Engine Speed |
(a) Using the Data List, check the current engine speed value of the stop and start ECU.
OK:
Stop and Start ECU "Engine Speed" > "Engine Speed (ENG)" + 300 rpm
| NG |
 | GO TO STEP 12 |
|
| 10. | CHECK DATA POINTS (Engine Speed) |
(a) Check the RoB data points.
OK:
For each and all of the data points, "Engine Speed" > "Engine Speed (ECM)" + 300 rpm
| OK |
 | READ VALUE USING GTS (Engine Speed) |
|
| 11. | CHECK ENGINE STOP AND START ECU (STA SIGNAL) |
| *a | Component without harness connected (Engine Stop and Start ECU) | - | - |
| Tester Display |
|---|
| Starter Motor Drive Magnet Switch(Hood Close) |
(a) Measure the voltage according to the value(s) in the table below.
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Standard Voltage:
Tandem Starter| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A67-21 (STA) - A67-6 (DGND) | Performing Active Test, while cranking. | 6 to 14 V |
| (b) Using an oscilloscope, measure the waveform immediately after starting.
OK: Voltage and waveform both normal |
|
| OK |
 | INSPECT ENGINE (Pre-ignition, SFI System, Poor Startability) |
| NG |
 | REPLACE ENGINE STOP AND START ECU |
| 12. | CHECK ENGINE STOP AND START ECU (STA SIGNAL) |
| *a | Component without harness connected (Engine Stop and Start ECU) | - | - |
| Tester Display |
|---|
| Starter Motor Drive Magnet Switch(Hood Close) |
(a) Measure the voltage according to the value(s) in the table below.
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Standard Voltage:
Tandem Starter| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A67-21 (STA) - A67-6 (DGND) | Performing Active Test, while cranking. | 6 to 14 V |
| (b) Using an oscilloscope, measure the waveform immediately after starting.
OK: Voltage and waveform both normal |
|
| OK |
 | INSPECT ENGINE (Pre-ignition, SFI System, Poor Startability) |
| NG |
 | REPLACE ENGINE STOP AND START ECU |
| 13. | CHECK DATA POINTS (Engine Speed) |
(a) Check the RoB data points.
OK:
When "Starter Status"*1 is ON, there is even 1 point at which "Engine Speed" < 300 rpm
* "Starter Status" in the case of other than tandem starter, "Starter Motor Status" in the case of tandem starter.
| OK |
 | INSPECT STARTER SYSTEM |
|
| 14. | CHECK OPERATION |
(a) Check how long it took the engine to stall after turning the starter off.
| Result | Proceed to |
|---|---|
| After starter turned off, engine immediately stalls. HINT: Engine stalls within 2 seconds. | A |
| After starter turned off, engine stalls after a time. | B |
| A |
 | SFI SYSTEM (Poor Startability) |
| B |
 | SFI SYSTEM (Engine stalls) |
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Break-In Period
No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.
Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.