Toyota Yaris: Stop And Start System / Starter Inrush Current Reduction Relay Circuit
DESCRIPTION
The starter inrush current reduction relay prevents the auxiliary battery voltage from becoming dropping excessively while the starter assembly is operating. If the auxiliary battery voltage drops below the threshold, stop and start control will be prohibited. In order to prevent this, the engine stop and start ECU operates the starter inrush current reduction relay for approximately 0.1 seconds after the ST NO. 1 relay is activated. By allowing current to flow to the starter inrush current reduction relay, the current that flows to the starter motor is reduced, preventing the auxiliary battery voltage from dropping excessively.
CAUTION / NOTICE / HINT
HINT:
-
Starter inrush current reduction relay stuck on:
When the engine is started by stop and start control, a large amount of current will flow to the starter assembly, the auxiliary battery voltage will drop excessively and stop and start control will be canceled.
-
Starter inrush current reduction relay stuck off:
Operating current will always flow through the starter inrush current reduction relay and the cranking speed will be low.
-
For wire harness and connector inspection procedures and precautions, refer to "
"
PROCEDURE
| 1. | CHECK WAVEFORM (STARTER INRUSH CURRENT REDUCTION RELAY) |
(a) Connect the positive (+) lead of an oscilloscope to the positive (+) auxiliary battery terminal and the negative (-) lead to the negative (-) auxiliary battery terminal.
(b) While cranking the engine, count the number of times the waveform drops.
Standard:
Waveform drops 2 times
| OK |
 | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG |
 | REPLACE STARTER INRUSH CURRENT REDUCTION RELAY |
After Engine Stops due to Stop and Start System, Engine does not Restart
DESCRIPTION
This is the troubleshooting procedure for situations where the engine does not restart after having been stopped by the 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...
Other information:
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed...
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Fuel Gauge
The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full.
