STOP AND START SYSTEM, Diagnostic DTC:P1545

DTC Code	DTC Name
P1545	Starter Maintenance

DESCRIPTION

If the number of starter operations exceeds a specified limit, Stop and Start system control will be prohibited. This DTC will be stored and the stop and start cancel indicator light will start blinking to inform the driver that control has been prohibited.

The STA signal (starter signal) is directly detected by the engine stop and start ECU and also detected by the ECM and sent to the engine stop and start ECU.

If above two signals do not match, this DTC will be stored.

DTC No.	DTC Detection Condition	Trouble Area
P1545	The following condition is met (1 trip detection logic): The number of starter operations exceeds the specified limit. Ignition switch ON	Starter assembly
P1545	Both of the following conditions continue for 2 seconds or more (1 trip detection logic): Normal communication with the ECM. STA signals detected by the ECM and the engine stop and start ECU do not match.	Harness or connector Engine stop and start ECU ST relay ECM

DTC No.

DTC Detection Condition

Trouble Area

P1545

The following condition is met (1 trip detection logic):

The number of starter operations exceeds the specified limit.
Ignition switch ON

Starter assembly

P1545

Both of the following conditions continue for 2 seconds or more (1 trip detection logic):

Normal communication with the ECM.
STA signals detected by the ECM and the engine stop and start ECU do not match.

Harness or connector
Engine stop and start ECU
ST relay
ECM

Tech Tips

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.

After troubleshooting, perform the following steps to recheck for DTCs and check if the Stop and Start system operates normally.
Tech Tips
- If the battery terminal has been disconnected, the stop and start will be prohibited. In this case, drive the vehicle for 15 to 40 minutes to permit the stop and start operation.
- Allow the engine to idle for 3 minutes after the engine warms up and check that the engine speed is within 50 rpm of the target idle speed.
1. for Manual transaxle
  1. Connect the intelligent tester to the DLC3.
  2. Clear the DTCs Click here.
  3. Start the engine and warm it up.
  4. Drive the vehicle at 20 km/h (12.4 mph) or more.
  5. Stop the vehicle, allow the engine to stop due to Stop and Start system control and wait for 3 seconds or more.
  6. Depress the clutch pedal to allow the engine to restart.
    
    Tech Tips
    
    If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.
  7. Check that no DTCs are output Click here.
2. for CVT
  1. Connect the intelligent tester to the DLC3.
  2. Clear the DTCs Click here.
  3. Start the engine and warm it up.
  4. Drive the vehicle at 20 km/h (12.4 mph) or more.
  5. Stop the vehicle, allow the engine to stop due to Stop and Start system control and wait for 3 seconds or more.
  6. Release the brake pedal to allow the engine to restart. (with the shift lever in D)
    
    Tech Tips
    
    If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.
  7. Check that no DTCs are output Click here.
Check if the Stop and Start system operates normally.

Tech Tips

If the battery terminal has been disconnected, the stop and start will be prohibited. In this case, drive the vehicle for 15 to 40 minutes to permit the stop and start operation.
1. for Manual transaxle
  1. Warm up the engine.
  2. Turn the air conditioning system off.
  3. Drive the vehicle at 7 km/h (4.3 mph) or more.
  4. Stop the vehicle. Move the shift lever to neutral and release the clutch pedal.
  5. Check that the engine stops.
  6. Depress the clutch pedal and check that the engine restarts.
2. for CVT
  1. Warm up the engine.
  2. Turn the air conditioning system off.
  3. Drive the vehicle at 7 km/h (4.3 mph) or more.
  4. Stop the vehicle with the shift lever in D and depressed the brake pedal.
  5. Check that the engine stops.
  6. Release the brake pedal and check that the engine restarts.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note

If the engine stop and start ECU is being replaced, register the previously recorded number of starter operations into the new engine stop and start ECU Click here.
After the starter assembly is replaced, be sure to clear the number of starter operations stored in the engine stop and start ECU Click here.
After the engine stop and start ECU is replaced or after an air conditioner kit is installed, clear the A/C information stored in the engine stop and start ECU Click here.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
After the engine stop and start ECU or airbag sensor assembly (yaw rate sensor) is replaced, initialize and calibrate 0 point of deceleration sensor Click here.

PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STARTER OPERATION NUMBER)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Stop and Start / Data List / Starter Operation #.

Read the Starter Operation # value displayed on the intelligent tester.

Result
Result	Proceed to
368000 or more	A
Below 368000	B

READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL FOR SFI SYSTEM) Click here

REPLACE STARTER ASSEMBLY
1. Replace the starter assembly Click here.
2. Reset the starter operation number Click here.
NEXT
END

READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL FOR SFI SYSTEM)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Starter.
Depress the clutch pedal fully. (for Manual transaxle)

Read the value displayed on the intelligent tester when the ignition switch is turned to the ON and START positions.

Note

The value may not be displayed correctly on the intelligent tester. because of the battery's condition (a minimum battery voltage when to start the engine: 8.5V or higher)

Ignition Switch Position	Starter
ON	OFF
START	ON

Result
Result	Proceed to
OK	A
NG (w/o Entry and Start System)	B
NG (w/ Entry and Start System)	C

REPAIR OR REPLACE STARTER SIGNAL CIRCUIT (STARTER SIGNAL CIRCUIT FOR SFI SYSTEM) Click here

REPAIR OR REPLACE STARTER SIGNAL CIRCUIT (CRANKING HOLDING FUNCTION CIRCUIT FOR SFI SYSTEM) Click here

INSPECT ENGINE STOP AND START ECU (STA TERMINAL VOLTAGE)

Turn the ignition switch to ON.

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

Tech Tips

If battery voltage drops below 8 V when cranking, CAN communication may be interrupted.

Text In Illustration
*a	Component with harness connected: (Engine Stop and Start ECU)	-	-

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
A53-4 (STA) - Body ground	Ignition switch ON	0 to 1.5 V
A53-4 (STA) - Body ground	Cranking	6 to 14 V

USE SIMULATION METHOD TO CHECK Click here

INSPECT ST RELAY

Remove the ST relay from the engine room main relay block.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage not applied	10 kΩ or higher
3 - 5	Battery voltage applied to terminals 1 and 2	Below 1 Ω

REPLACE ST RELAY

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ENGINE ROOM RELAY BLOCK)

Disconnect A53 engine stop and start ECU connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A53-4 (STA) - ST relay terminal 2	Always	Below 1 Ω
A53-4 (STA) - Body ground	Always	10 kΩ or higher
ST relay terminal 2- Body ground	Always	10 kΩ or higher

Reinstall the ST relay to the engine room main relay block.

Result
Result	Proceed to
OK (for manual transaxle)	A
OK (for CVT)	B
NG	C

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - PARK/NEUTRAL POSITION SWITCH) Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the A39 clutch start switch (lower) connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A53-4 (STA) - A39-1	Always	Below 1 Ω
A53-4 (STA) - Body ground	Always	10 kΩ or higher
A39-1 - Body ground	Always	10 kΩ or higher

Reconnect the A39 clutch start switch (lower) connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM)

Disconnect A58 ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A53-4 (STA) - A58-22 (STA)	Always	Below 1 Ω
A53-4 (STA) - Body ground	Always	10 kΩ or higher
A58-22 (STA) - Body ground	Always	10 kΩ or higher

Reconnect A53 engine stop and start ECU connector.
Reconnect A58 ECM connector.

REPLACE ENGINE STOP AND START ECU Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - PARK/NEUTRAL POSITION SWITCH)

Disconnect the B69 Park/neutral position switch connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A53-4 (STA) - B69-9 (L)	Always	Below 1 Ω
A53-4 (STA) - Body ground	Always	10 kΩ or higher
B69-9 (L) - Body ground	Always	10 kΩ or higher

Reconnect the B69 Park/neutral position switch connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM)

Disconnect A58 ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A53-4 (STA) - A58-22 (STA)	Always	Below 1 Ω
A53-4 (STA) - Body ground	Always	10 kΩ or higher
A58-22 (STA) - Body ground	Always	10 kΩ or higher

Reconnect A53 engine stop and start ECU connector.
Reconnect A58 ECM connector.

REPLACE ENGINE STOP AND START ECU Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR