Toyota Yaris: Stop And Start System / ECU Internal Error (P164400)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / ECU Internal Error (P164400)

DESCRIPTION

If a malfunction is detected in the starter circuit, the engine stop and start ECU stores DTC P164400 and blinks the stop and start cancel indicator.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

Note

P164400

ECU Internal Error

Both of the following conditions are met for 0.2 seconds or more (1 trip detection logic):

  • Ignition switch ON.
  • Malfunction in starter circuit (STA).
  • Wire harness or connector
  • ST NO. 1 relay
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P1644

CONFIRMATION DRIVING PATTERN

HINT:

  • If the cable is disconnected from the auxiliary battery terminal, stop and start control is prohibited until refresh charge is completed.

    In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Auxiliary Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the auxiliary battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

  • If the GTS is not available and the Data List item Status of Auxiliary Battery Charge Control cannot be checked, charge the auxiliary battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

    If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

  • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.
  • Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.

CONFIRMATION AFTER TROUBLESHOOTING

(a) Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs

(b) Start the engine and warm it up.

(c) Drive the vehicle at 7 km/h (4 mph) or more.

CAUTION:

When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

(d) Stop the vehicle, move the shift lever to neutral and release the clutch pedal.

(e) Keep the engine stopped by stop and start control for 1 second or more.

(f) Depress the clutch pedal and start the engine.

(g) Check that DTCs are not output.

Powertrain > Stop and Start > Trouble Codes

STOP AND START SYSTEM OPERATION CHECK

Click here

WIRING DIAGRAM

Refer to DTC P061519.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).

    Click here

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

  • Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

    Click here

  • If DTCs P060B1C (Analog to Digital Converter Circuit Voltage Out of Range), P060B49 (Analog to Digital Converter Internal Electronic Failure) or P060B71 (Analog to Digital Converter Actuator Stuck) and P164400 (ECU Internal Error) are output simultaneously,, perform troubleshooting for DTC P060B1C, P060B49 or P060B71 first as it may have caused DTC P164400 to be stored.

    Click here

  • If DTCs P061519 (Starter Relay Circuit Current Above Threshold) and P164400 (ECU Internal Error) are output simultaneously, perform troubleshooting for DTC P061519 first as it may have caused DTC P164400 to be stored.

    Click here

  • For wire harness and connector inspection procedures and precautions, refer to " "
  • DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

    Click here

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P164400)

(a) Read the DTCs.

Powertrain > Stop and Start > Trouble Codes

Result

Proceed to

DTC P164400 is output

A

DTCs P060B1C, P060B49 or P060B71 and P164400 are output

B

DTCs P061519 and P164400 are output

C

B

GO TO DTC P060B1C, P060B49 OR P060B71

C

GO TO DTC P061519

A

2.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST NO. 1 RELAY)

(a) Disconnect the H45 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A64 clutch switch assembly connector.

(c) Disconnect the A67 engine stop and start ECU connector.

(d) Remove the ST NO. 1 relay from the No. 1 engine room relay block.

(e) Measure the resistance according to the value(s) in the table below.

Click here

Standard Resistance:

Tester Connection

Condition

Specified Condition

A67-21 (STA) - 2 (ST NO. 1 relay holder)

Always

Below 1 Ω

A67-21 (STA) - Body ground and other terminals

Always

10 kΩ or higher

2 (ST NO. 1 relay holder) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - CLUTCH SWITCH ASSEMBLY)

(a) Disconnect the A67 engine stop and start ECU connector.

(b) Disconnect the A64 clutch switch assembly connector.

(c) Disconnect the H45 certification ECU (smart key ECU assembly) connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A67-21 (STA) - A64-1 (L)

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT RELAY (ST NO. 1 RELAY)

(a) Inspect the ST NO. 1 relay.

Click here

NG

REPLACE RELAY (ST NO. 1 RELAY)

OK

5.

CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - BODY GROUND)

(a) Remove the ST NO. 1 relay from the No. 1 engine room relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (ST NO. 1 relay holder) - Body ground

Always

Below 1 Ω

OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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