DTC P0615-12: Starter Relay Circuit Short to Battery [12/2019 - 10/2022]: Procedure

1. Read the Data List according to the display on the GTS.

   Powertrain > Transmission > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Starter SW	Starter signal	OFF or ON	ON: Starter operating OFF: Starter not operating	-

   Powertrain > Transmission > Data List 

   Tester Display
   Starter SW

   OK

   Condition	Starter SW
   Ignition switch ON	OFF

2. Read the Data List according to the display on the GTS while the vehicle is being driven with an engine speed of 1000 rpm or more at a vehicle speed of 20 km/h (12 mph) or more.

   OK

   Condition	Starter SW
   Driving at 20 km/h (12 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 ignition switch ON, the GTS connected and Data List item "Starter SW" selected.

   Result

   Proceed to
   OK
   NG

   HINT: 

   If the starter assembly operates continuously when the ignition switch is turned to ON, proceed to the next step without reading the Data List item "Starter SW".

Result: 

OK 

SYMPTOMS SIMULATION AND DTC CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

See step  2

1. Read the Data List according to the display on the GTS.

   Powertrain > Transmission > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Starter SW	Starter signal	OFF or ON	ON: Starter operating OFF: Starter not operating	-

   Powertrain > Transmission > 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. Read the Data List according to the display on the GTS again.

   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 GTS.

Result: 

B 

REPLACE ST RELAY 

Result: 

A 

See step  3

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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
   *2	ST Relay Holder

2. Turn the ignition switch to ON.
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 inspecting the change in voltage in the next step. As the next step should be conducted under the same conditions, keep the ignition switch ON and do not install the ST relay.
   • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.
   • If any voltage was measured with the ignition switch ON, one of the following malfunctions is suspected:
     • Short to +B in the circuit of a connected ECU or park/neutral position switch assembly.
     • Short to +B in the wire harness.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Disconnect the C52 park/neutral position switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
   *2	ST Relay Holder

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 GTS.

Result: 

B 

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to  COMPONENTS [12/2019 - 10/2022] 

Result: 

A 

See step  5

1. Disconnect the A34 engine stop and start ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
   *2	ST Relay Holder

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 engine stop and start ECU is normal.
   • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

Result: 

B 

REPLACE ENGINE STOP AND START ECU. Refer to  COMPONENTS [12/2019 - ] 

Result: 

A 

See step  6

1. Disconnect the A28 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
   *2	ST Relay Holder

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 GTS.

Result: 

B 

See step  8

Result: 

A 

See step  7

1. Disconnect the A28 ECM connector.
2. Disconnect the C52 park/neutral position switch assembly connector.
3. Disconnect the A19 certification ECU (smart key ECU assembly) connector.
4. Disconnect the A34 engine stop and start ECU connector.
5. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A28-43 (STA), C52-9 (L), A19-20 (STA), A34-21 (STA) or 2 (ST relay) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

CHECK SMART KEY SYSTEM (CHECK FOR STA TERMINAL VOLTAGE OF SMART KEY ECU ASSEMBLY). Refer to  TERMINALS OF ECU [12/2019 - 10/2021]  , or refer to  TERMINALS OF ECU [10/2021 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Replace the ECM.

   Refer to COMPONENTS [12/2019 - 10/2022]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM REGISTRATION. Refer to  REGISTRATION [12/2019 - 10/2022]