Toyota Corolla Cross: Starter Relay Circuit Short to Battery or Open (P061515)

DESCRIPTION

When the STA signal detected by the ECM and by the engine stop and start ECU do not match, the engine stop and start ECU stores DTC P061515.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	Note
P061515	Starter Relay Circuit Short to Battery or Open	Both of the following conditions are met for 2 seconds or more (1 trip detection logic): Normal communication with the ECM. The STA signal detected by the ECM and STA signal detected by the engine stop and start ECU do not match.	Wire harness or connector ST NO. 1 relay Engine stop and start ECU ECM	Comes on (For Mexico Models: Does not come on)	Does not come on (For Mexico Models: Blinks)	SAE Code: P0617

MONITOR STRATEGY

Related DTCs	P0617: Starter relay range check (high voltage)
Required Sensors/Components (Main)	Engine stop and start ECU
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	3 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All of the following conditions are met	-
Battery voltage	8 V or higher
Write Inhibit	permit
Time after Write status forbiddance to permit	0.5 seconds or more
Ignition switch	ON
Time after ignition switch is off to ON	0.5 seconds or more
Either of the following conditions (a) or (b) is met	-
(a) Engine stop and start ECU internal starter relay circuit check	Canceled
(b) Engine stop and start ECU internal starter relay circuit check	Completed
Engine stop and start ECU internal high side switch for starter relay	OFF
Engine stop and start ECU internal low side switch for starter relay	ON
Engine stop and start ECU internal limit switch for starter relay	ON
A/D converter fail (P060B)	Not detected
Engine stop and start ECU internal starter relay circuit fail (P1644)	Not detected
Starter relay circuit low fail (P0616)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

All of the following conditions are met	-
Engine stop and start ECU starter relay voltage	Higher than [Battery voltage x 0.44] V
Engine stop and start ECU starter relay voltage	Less than [Battery voltage x 0.88] V
Engine stop and start ECU starter relay terminal voltage level	High

CONFIRMATION DRIVING PATTERN

HINT:

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.

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 Battery Charge Control" changes from "Refresh Charge Mode". (Usually, by 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 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.
• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure (except Mexico Models).

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

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) Depress the brake pedal and stop the vehicle.

(e) Keep the engine stopped by stop and start control. (Keep the shift lever in D.)

(f) Release the brake pedal with the shift lever in D to start the engine.

(g) Check that no DTCs are output.

Powertrain > Stop and Start > Trouble Codes

STOP AND START SYSTEM OPERATION CHECK

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WIRING DIAGRAM

Refer to DTC P061511.

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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.

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• 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.

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• When the ECM is replaced on a vehicle with a non-specified battery, it is necessary to perform battery type switching.

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

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• Inspect the fuses for circuits related to this system before performing the following procedure.
• When the engine stop and start ECU or oil pump with motor assembly is replaced, check the oil pump with motor assembly.

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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.

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PROCEDURE

1.	READ VALUE USING GTS (ENGINE STARTER SIGNAL)

(a) Enter the following menus: Powertrain / Stop and Start / Data List / Engine Starter Signal.

Powertrain > Stop and Start > Data List

Tester Display
Engine Starter Signal

(b) Read the values displayed on the GTS when the ignition switch is ON and START.

OK:

Tester Display	Condition	Normal Condition
Engine Starter Signal	Ignition switch ON	OFF
	Ignition switch START	ON

NG

GO TO STEP 4

OK

2.	READ VALUE USING GTS (STARTER SW)

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

Powertrain > Engine > Data List

Tester Display
Starter SW

(b) Read the values displayed on the GTS when the ignition switch is ON and START.

OK:

Tester Display	Condition	Normal Condition
Starter SW	Ignition switch ON	OFF
	Ignition switch START	ON

OK

USE SIMULATION METHOD TO CHECK

NG

3.	CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)

(a) Disconnect the A169 engine stop and start ECU connector.

(b) Disconnect the A47 ECM connector.

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

(d) Disconnect the I223 certification ECU (smart key ECU assembly) connector. (w/ Smart Key System)

(e) Disconnect the C62 park/neutral position switch assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A47-30 (STA) - ST relay terminal 2	Always	Below 1 Ω
A47-30 (STA) - Body ground	Always	10 kΩ or higher
ST relay terminal 2 - Body ground	Always	10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST RELAY)

(a) Disconnect the A169 engine stop and start ECU connector.

(b) Disconnect the A47 ECM connector.

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

(d) Disconnect the I223 certification ECU (smart key ECU assembly) connector. (w/ Smart Key System)

(e) Disconnect the C62 park/neutral position switch assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
*: w/ Smart Key System
C62-5 (L) - ST relay terminal 2	Always	Below 1 Ω
I223-3 (STA) - ST relay terminal 2*	Always	Below 1 Ω
A169-21 (STA) - A19-16 (STA)	Always	Below 1 Ω
C62-5 (L) - Body ground	Always	10 kΩ or higher
I223-3 (STA) - Body ground*	Always	10 kΩ or higher
A169-21 (STA) - Body ground	Always	10 kΩ or higher
ST relay terminal 2 - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	INSPECT RELAY (ST RELAY)

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NG

REPLACE RELAY (ST RELAY)

OK

6.	CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

(a) Remove the ST 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
ST relay terminal 1 - Body ground	Always	Below 1 Ω

OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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