Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Starter Relay Circuit Short to Battery (P061512)

MONITOR DESCRIPTION

While the engine is being cranked, 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 stores the DTC.

This monitor runs when the vehicle is driven at 20 km/h (12.43 mph) or more for 20 seconds or more.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

HINT:

• After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

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• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

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1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the engine switch off and wait for at least 30 seconds.
6. Turn the engine switch on (IG) [A].
7. Turn the Techstream on.
8. Start the engine.
9. Idle the engine for 5 seconds or more [B].
10. Drive the vehicle at a speed of 24 km/h (15 mph) or more for 20 seconds or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

11. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
12. 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.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Input the DTC: P061512.
15. Check the DTC judgment result.

    Techstream 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.
    • [A] to [D]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. Freeze frame data records 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.

PROCEDURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Starter SW.

(e) According to the display on the Techstream, read the Data List.

Standard:

(f) According to the display on the Techstream, read the Data List while the vehicle is being driven with an engine speed of 1000 rpm or more at a vehicle speed of 20 km/h (12.43 mph) or more.

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Standard:

HINT:

If the result of either of the above is not as specified, proceed to the next step with the engine switch on (IG), Techstream connected and Data List item "Starter SW" selected.

HINT:

If the starter assembly operates continuously when the engine switch is turned on (IG), proceed to the next step without reading the Data List item "Starter SW".

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

(a) Enter the following menus: Powertrain / Engine / Data List / Starter SW.

(b) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(c) According to the display on the Techstream, read the Data List.

HINT:

• When the result of the above inspection is "The Data List item "Starter SW" does not change from ON", the ST relay is normal.
• DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream.

B

REPLACE ST RELAY

A

HINT:

The purpose of this step is to check for ST relay terminal voltage under abnormal conditions.

(a) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Turn the engine switch on (IG).

(c) Measure the voltage between ST relay terminal 2 and body ground.

HINT:

• Make a note of the measured voltage as it will be necessary for the inspecting the change in voltage in the next step. As the next step should be conducted under the same conditions, keep the engine switch on (IG) and do not install the ST relay.
• DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream.
• If any voltage was measured with the engine switch on (IG), one of the following malfunctions is suspected:
  • Short to +B in the circuit of a connected ECU or the switch.
  • Short to +B in the wire harness.

NEXT

(a) Disconnect the park/neutral position switch assembly connector.

(b) Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.

HINT:

• If the voltage is the same before and after disconnecting the connector, the park/neutral position switch assembly is normal.
• DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream.

B

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY

A

(a) Disconnect the ECM connector.

(b) Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.

HINT:

• If the voltage is the same before and after disconnecting the connector, the ECM is normal.
• DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream.

B

REPLACE ECM

A

(a) Disconnect the ECM connector.

(b) Disconnect the park/neutral position switch assembly connector.

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

(d) Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

OK

CHECK SMART KEY SYSTEM (CHECK FOR STA TERMINAL VOLTAGE OF SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR