DTC P0615-12: Starter Relay Circuit Short to Battery [08/2020 - 08/2021]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

   Powertrain > Engine > Data List 

   Tester Display
   Starter SW

5. According to the display on the Techstream, read the Data List.

   Standard

   Condition	Starter SW
   Engine switch on (IG)	OFF

6. 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.
   WARNING:

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

   Standard

   Condition	Starter SW
   Driving at 20 km/h (12.43 mph) or more (engine speed 1000 rpm or more)	OFF

   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.

   Result

   Proceed to
   OK
   NG

   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".

Result: 

OK 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2020 - ] 

Result: 

NG 

See step  2

1. Enter the following menus: Powertrain / Engine / Data List / Starter SW.

   Powertrain > Engine > Data List 

   Tester Display
   Starter SW

2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
3. According to the display on the Techstream, read the Data List.

   Result

   Result	Proceed to
   The Data List item "Starter SW" does not change from ON	A
   The Data List item "Starter SW" changes from ON to OFF	B

   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.

Result: 

B 

REPLACE ST RELAY 

Result: 

A 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT: 

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

1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
2. Turn the engine switch on (IG).
3. 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.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the park/neutral position switch assembly connector.
2. Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.

   Result

   Result	Proceed to
   The voltage between ST relay terminal 2 and body ground does not change when the connector is disconnected.	A
   The voltage between ST relay terminal 2 and body ground changes when the connector is disconnected.	B

   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.

Result: 

B 

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

A 

See step  5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the ECM connector.
2. Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.

   Result

   Result	Proceed to
   The voltage between ST relay terminal 2 and body ground does not change when the connector is disconnected.	A
   The voltage between ST relay terminal 2 and body ground changes when the connector is disconnected.	B

   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.

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

A 

See step  6

1. Disconnect the ECM connector.
2. Disconnect the park/neutral position switch assembly connector.
3. Disconnect the certification ECU (smart key ECU assembly) connector.
4. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A28-30 (STA), C31-9 (L), A15-20 (STA) or 2 (ST relay) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (CHECK FOR STA TERMINAL VOLTAGE OF SMART KEY ECU ASSEMBLY). Refer to  TERMINALS OF ECU [08/2020 - 09/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR