Toyota Corolla Cross: Hybrid/EV Battery Control System Circuit Voltage Below Threshold (P300016)

DESCRIPTION

The battery ECU assembly alerts the driver and performs fail-safe control based on malfunction signals.

If the HV battery is discharged excessively or the hybrid battery system is malfunctioning, this DTC will be stored.

HINT:

If the HV battery voltage has dropped due to a malfunction in other components, such as the inverter with converter assembly or the hybrid vehicle transaxle assembly, recharging the HV battery will be able to restore the voltage. If the HV battery voltage has dropped excessively after the vehicle was left for a long time, the HV battery will need to be replaced.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	Note
P300016	Hybrid/EV Battery Control System Circuit Voltage Below Threshold	Either of the following conditions is met: A malfunction signal is received from the battery ECU assembly. The voltage of any HV battery cell has decreased excessively. (1 trip detection logic)	SFI system Engine Hybrid vehicle transaxle assembly HV battery state of charge	Does not come on	Master Warning: Comes on	SAE Code: P3000

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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1. Connect the GTS to the DLC3.
2. Turn the ignition switch to ON and turn the GTS on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for 2 minutes or more.
5. Turn the ignition switch to ON (READY) with the shift lever in P.
6. Wait until the engine starts and then stops.
7. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
8. Check the DTC judgment result.

   HINT:

   • If the judgment result shows NORMAL, the system is normal.
   • If the judgment result shows ABNORMAL, the system has a malfunction.
   • If the judgment result shows INCOMPLETE, perform driving pattern again.

CAUTION / NOTICE / HINT

HINT:

• Thoroughly interview the customer as DTC P300016 may be stored if the SOC drops due to the vehicle being left with the shift lever in N for a long time or running out of fuel.
• When the engine cannot be started, DTC P300016 may be stored because the HV battery cannot be charged.
• If differences among SOCs of HV battery exceed the specifications, the master warning may illuminate when "Battery Diagnosis" is complete. In this case, check for hybrid system related DTCs. If DTC P300016 is output, leave the vehicle with the ignition switch ON (READY) for 10 minutes or more allowing the vehicle to charge the HV battery. Then clear the DTCs.

PROCEDURE

1.	CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)

(a) Check for DTCs.

Powertrain > HV Battery > Trouble Codes Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
"P300000 or P300016" only is output.	A
DTCs except "P300000 or P300016" of hybrid battery system are output.	B
DTCs except "P300000 or P300016" of hybrid control system are output.	C

(b) Turn the ignition switch off.

B

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

C

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

A

2.	CHECK DTC OUTPUT (ENGINE)

(a) Check for DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
No DTCs are output.	A
DTCs are output.	B

(b) Turn the ignition switch off.

B

GO TO DTC CHART (SFI SYSTEM)

A

3.	CHECK ENGINE START

(a) Turn the ignition switch to ON (READY).

(b) Check if the engine starts.

NOTICE:

Do not turn the ignition switch to ON (READY) repeatedly after duplicating the problem symptom indicated by DTC P300016 and clearing the DTCs. This may cause another problem to occur.

HINT:

Depressing the accelerator pedal with the shift lever in P will cause the engine to start.

Result	Proceed to
The engine does not start.	A
The engine starts.	B

(c) Turn the ignition switch off.

B

LEAVE VEHICLE WITH THE SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS

A

4.	CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)

(a) Make sure that the shift lever is in P position.

(b) Lift up the vehicle.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:

Do not turn the ignition switch to ON (READY) while performing this inspection. Be sure to turn the ignition switch off before performing this inspection, to prevent the engine from starting.

NOTICE:

Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

Result	Proceed to
The crankshaft rotates smoothly.	A
The crankshaft does not rotate smoothly.	B

(d) Lower the vehicle.

A

CHARGE HV BATTERY HINT: As the HV battery is not malfunctioning, it is necessary to charge the HV battery with the THS charger.

B

5.	CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)

(a) Lift up the vehicle.

(b) Move the shift lever to N.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:

Do not turn the ignition switch to ON (READY) while performing this inspection. Be sure to turn the ignition switch off before performing this inspection, to prevent the engine from starting.

NOTICE:

Engine compression causes resistance when turning the crankshaft pulley. Check if the crankshaft rotates smoothly (or if it is locked) by manually applying sufficient torque to turn the crankshaft pulley. The torque required to turn the crankshaft pulley should be the same as for a known good vehicle of the same type.

Result	Proceed to
The crankshaft does not rotate smoothly.	A
The crankshaft rotates smoothly.	B

(d) Move the shift lever to P.

(e) Lower the vehicle.

B

GO TO STEP 8

A

6.	REPAIR OR REPLACE ENGINE

NEXT

7.	CHECK ENGINE START

(a) Turn the ignition switch to ON (READY).

(b) Check if the engine starts.

NOTICE:

Do not turn the ignition switch to ON (READY) repeatedly after duplicating the problem symptom indicated by DTC P300016 and clearing the DTCs. This may cause another problem to occur.

HINT:

Depressing the accelerator pedal with the shift lever in P will cause the engine to start.

Result	Proceed to
The engine does not start.	A
The engine starts.	B

(c) Turn the ignition switch off.

A

CHARGE HV BATTERY HINT: As the HV battery is not malfunctioning, it is necessary to charge the HV battery with the THS charger.

B

LEAVE VEHICLE WITH THE SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS

8.	REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

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NEXT

9.	CHECK ENGINE START

(a) Turn the ignition switch to ON (READY).

(b) Check if the engine starts.

NOTICE:

Do not turn the ignition switch to ON (READY) repeatedly after duplicating the problem symptom indicated by DTC P300016 and clearing the DTCs. This may cause another problem to occur.

HINT:

Depressing the accelerator pedal with the shift lever in P will cause the engine to start.

Result	Proceed to
The engine does not start.	A
The engine starts.	B

(c) Turn the ignition switch off.

A

CHARGE HV BATTERY HINT: As the HV battery is not malfunctioning, it is necessary to charge the HV battery with the THS charger.

B

LEAVE VEHICLE WITH THE SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS

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