Lexus NX: Hybrid Battery Voltage / DC/DC Converter Voltage Correlation (P1C2D-587)

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU detects a VB sensor or VL sensor malfunction.

The cause of this malfunction may be one of the following:

Inspection Overview

Inspection Content	Reason (Narrow Down in Order Using Inspection Procedures Below)	Inspection Step
Check for DTCs (HV)	Output DTCs	1
Check for DTCs (check voltage sensor malfunction locations) Check for DTCs (drive test)	Put vehicle in ready ON (vehicle stopped or being driven) and then check whether DTCs are output again.	3, 4
Read value using Techstream	Data List value	5
Check freeze frame data (HV)	FREEZE FRAME DATA	6, 7
Read value using Techstream	Accelerator and brake pedal simultaneously depressed Data List value	8

DESCRIPTION

For a description of the boost converter.

Click here

The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before it is boosted. The ECU also uses the battery voltage sensor to detect HV battery voltage (VB).

HINT:

Using the Techstream, check the Data List values of "Power Resource VB" and "Batt Pack Current Val". If these values are not within the range below, there is a malfunction in the battery voltage sensor circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P1C2D-587	Hybrid Battery Voltage / DC/DC Converter Voltage Correlation	Voltages from HV battery voltage (VB) sensor and boost converter voltage (VL) sensor deviate: Difference between "VL-Voltage before Boosting" and "Power Resource VB" is large when the boosting request is given. (1 trip detection logic)	Inverter with converter assembly Battery voltage sensor	Comes on	Master Warning Light: Comes on

Related Data List

DTC No.	Data List
P1C2D-587	Power Resource VB VL-Voltage before Boosting VH-Voltage after Boosting Boost Ratio

MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors signals of HV battery voltage (VB) and boost converter voltage (VL) sensors. When a large difference occurs between the voltages from the VB and VL sensors, the hybrid vehicle control ECU interprets this as a failure of either of the sensors. The hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P1C2D (INF 587): Voltage (VB or VL) sensor deviation
Required sensors/components	Boost converter
Frequency of operation	-
Duration	TMC's intellectual property
MIL operation	1 driving cycle
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P1C2D (INF 587) is not detected

CONFIRMATION DRIVING PATTERN

CAUTION / NOTICE / HINT

HINT:

When the accelerator pedal is not depressed with the power switch on (READY) and the shift lever in P, if "VL-Voltage before Boosting" and the "Power Resource VB" is approximately same after repair, the condition is judged as normal.

PROCEDURE

1.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
One of the following applies: Only P1C2D-587 is output. DTCs other than "P0CA3-442 and DTCs in Chart Below" are output at the same time.	A
P1C2D and P0CA3-442 (voltage execution value malfunction) are output at the same time.	B
DTC indicated in Chart 1 is output at the same time.	C
DTC indicated in Chart 2 is output at the same time.	D

Table 1:

Malfunction Content	Relevant DTC
Microcomputer malfunction	P0A1A-151, 658	Generator Control Module
	P0A1B-786	Drive Motor "A" Control Module
	P0A1D-148	Hybrid Powertrain Control Module
	P1C2A-155	Generator A/D Converter Circuit
	P1CA6-156	Generator Control Module Malfunction
	P1CA7-193	Drive Motor Control Module Malfunction
	P2511-149	HV CPU Power Relay Sense Circuit Intermittent No Continuity
	P3133-659	Communication Error from Generator to Drive Motor "A"
	P3134-661	Communication Error from Drive Motor "A" to Generator
	P324E-788	MG-ECU Power Relay Intermittent Circuit
Power source circuit malfunction	P06E6-164	Sensor Power Supply "C" Circuit / Open
	P1C73-512	Sensor Standard Voltage "F" Circuit / Open
Communication system malfunction	U0110 (all INF codes)*1	Lost Communication with Drive Motor Control Module "A"
Sensor and actuator circuit malfunction	P0B23-129	Hybrid Battery "A" Voltage
System malfunction	P0D2F-266	Drive Motor "A" Inverter Voltage Sensor Circuit Low
	P0D30-267	Drive Motor "A" Inverter Voltage Sensor Circuit High
	P0E32-585	DC/DC Converter Voltage Sensor "A" Range / Performance
	P0E33-589	DC/DC Converter Voltage Sensor "A" Low
	P0E34-590	DC/DC Converter Voltage Sensor "A" High
	P3004-132	High Voltage Power Resource

Table 2:

Malfunction Content	Relevant DTC
Microcomputer malfunction	P0AFC-123	Hybrid Battery Pack Sensor Module
Sensor and actuator circuit malfunction	P0B3D-123	Hybrid Battery Voltage Sensor "A" Circuit Low
	P0B42-123	Hybrid Battery Voltage Sensor "B" Circuit Low
	P0B47-123	Hybrid Battery Voltage Sensor "C" Circuit Low
	P0B4C-123	Hybrid Battery Voltage Sensor "D" Circuit Low
	P0B51-123	Hybrid Battery Voltage Sensor "E" Circuit Low
	P0B56-123	Hybrid Battery Voltage Sensor "F" Circuit Low
	P0B5B-123	Hybrid Battery Voltage Sensor "G" Circuit Low
	P0B60-123	Hybrid Battery Voltage Sensor "H" Circuit Low
	P0B65-123	Hybrid Battery Voltage Sensor "I" Circuit Low
	P0B6A-123	Hybrid Battery Voltage Sensor "J" Circuit Low
	P0B6F-123	Hybrid Battery Voltage Sensor "K" Circuit Low
	P0B74-123	Hybrid Battery Voltage Sensor "L" Circuit Low
	P0B79-123	Hybrid Battery Voltage Sensor "M" Circuit Low
	P0B7E-123	Hybrid Battery Voltage Sensor "N" Circuit Low
	P0B83-123	Hybrid Battery Voltage Sensor "O" Circuit Low
	P0B88-123	Hybrid Battery Voltage Sensor "P" Circuit Low
	P0B8D-123	Hybrid Battery Voltage Sensor "Q" Circuit Low
	P0B92-123	Hybrid Battery Voltage Sensor "R" Circuit Low
	P308A-123	Hybrid Battery Voltage Sensor All Circuits Low

(e) Turn the power switch off.

B

REPLACE INVERTER WITH CONVERTER ASSEMBLY

C

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

D

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

A

2.

CLEAR DTC

Click here

NEXT

3.	CHECK DTC OUTPUT (CHECK FAILURE PART)

(a) Apply the parking brake and secure the wheels using chocks.

(b) Connect the Techstream to the DLC3. *1

(c) Turn the power switch on (READY). *2

(d) Enter the following menus: Powertrain / Hybrid Control / Data List. *3

Powertrain > Hybrid Control > Data List

Tester Display
Power Resource VB
VL-Voltage before Boosting
Batt Pack Current Val

(e) If both "Power Resource VB" and "VL-Voltage before Boosting" are less than 280 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise both values to 280 V or more. *4

(f) Move the shift lever to P. *5

(g) Set the air conditioning to MAX COOL and turn the headlights on. *6

(h) Confirm that "Batt Pack Current Val" is more than 3 A. *7

(i) With the engine stopped and the conditions of steps *5, *6 and *7 satisfied, leave the vehicle for 15 seconds. *8

(j) Enter the following menus: Powertrain / Hybrid Control / Trouble codes. *9

(k) Check for DTCs. *10

Powertrain > Hybrid Control > Trouble Codes

NOTICE:

If the low HV battery information comes on, move the shift lever to P and start the engine to charge the HV battery. After the engine stops, perform steps *1 through *10 again.

Result	Proceed to
No DTCs are output, or DTCs except the following are output.	A
P0B23-129 (Hybrid Battery "A" Voltage) is output.	B
P0E32-585 (DC/DC Converter Voltage Sensor "A" Range / Performance) is output.	C
P3000-388 (Battery Control System) is output.	D
P3004-132 (High Voltage Power Resource) is output.	E

(l) Turn the power switch off.

B

REPLACE BATTERY VOLTAGE SENSOR

C

REPLACE INVERTER WITH CONVERTER ASSEMBLY

D

LEAVE VEHICLE WITH THE SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS *1 THROUGH *10)

E

REPLACE BATTERY VOLTAGE SENSOR

A

4.	CHECK DTC OUTPUT (ROAD TEST)

(a) Turn the power switch on (READY). *11

(b) Perform a road test that repeats full acceleration to 60 km/h (37 mph) and then braking to a complete stop three times. *12

CAUTION:

Perform this road test only in an appropriate safe location, in accordance with all local laws.

(c) Connect the Techstream to the DLC3. *13

(d) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. *14

(e) Check for DTCs. *15

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
No DTCs are output, or DTCs except the following are output.	A
P0B23-129 (Hybrid Battery "A" Voltage) is output.	B
P0E32-585 (DC/DC Converter Voltage Sensor "A" Range / Performance) is output.	C
P3000-388 (Battery Control System) is output.	D
P3004-132 (High Voltage Power Resource) is output.	E

(f) Turn the power switch off.

B

REPLACE BATTERY VOLTAGE SENSOR

C

REPLACE INVERTER WITH CONVERTER ASSEMBLY

D

LEAVE VEHICLE WITH THE SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS *11 THROUGH *15)

E

REPLACE BATTERY VOLTAGE SENSOR

A

5.	READ VALUE USING TECHSTREAM (DATA LIST)

(a) Apply the parking brake and secure the wheels using chocks.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (READY).

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Power Resource VB, VL-Voltage before Boosting, VH-Voltage after Boosting.

Powertrain > Hybrid Control > Data List

Tester Display
Power Resource VB
VL-Voltage before Boosting
VH-Voltage after Boosting

(e) If both "Power Resource VB" and "VL-Voltage before Boosting" are less than 280 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise both values to 280 V or more.

(f) Turn the engine off, move the shift lever to P, and read the Data List with the vehicle stationary.

Result	Proceed to
Both of the following are not satisfied.	A
Both of the following are satisfied: Difference between "Power Resource VB" and "VH-Voltage after Boosting" is less than 5 V. Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is more than 30 V.	B
Both of the following are satisfied: Difference between "VH-Voltage after Boosting" and "VL-Voltage before Boosting" is less than 5 V. Difference between "Power Resource VB" and "VH-Voltage after Boosting" is more than 15 V.	C

(g) Turn the power switch off.

B

REPLACE INVERTER WITH CONVERTER ASSEMBLY

C

REPLACE BATTERY VOLTAGE SENSOR

A

6.	CHECK FREEZE FRAME DATA (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Read the freeze frame data of DTC P1C2D-587.

Result	Proceed to
Both of the following are satisfied or both of the following are not satisfied.	A
"Power Resource VB" is less than 204 V or more than 340 V.	B
"VL-Voltage before Boosting" is less than 204 V or more than 340 V.	C

(e) Turn the power switch off.

B

REPLACE BATTERY VOLTAGE SENSOR

C

REPLACE INVERTER WITH CONVERTER ASSEMBLY

A

7.	CHECK FREEZE FRAME DATA (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Read the freeze frame data of DTC P1C2D-587.

HINT:

In the freeze frame data, read the item "Power Resource VB" and all of the "Battery Block Vol".

Result	Proceed to
Freeze frame data is not stored.	A
Both of the following are satisfied: Sum of all "Battery Block Vol" is more than ("Power Resource VB" -45 V) Sum of all "Battery Block Vol" is less than ("Power Resource VB" +30 V)	B
Neither A nor B is satisfied.	C

(e) Turn the power switch off.

B

REPLACE INVERTER WITH CONVERTER ASSEMBLY

C

REPLACE BATTERY VOLTAGE SENSOR

A

8.	READ VALUE USING TECHSTREAM (DATA LIST)

(a) Apply the parking brake and secure the wheels using chocks.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (READY).

(d) Enter the following menus: Powertrain / Hybrid Control / Data List.

(e) If both "Power Resource VB" and "VL-Voltage before Boosting" are less than 280 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise both values to 280 V or more.

Powertrain > Hybrid Control > Data List

Tester Display
Power Resource VB
VL-Voltage before Boosting

(f) Turn the engine off, move the shift lever to P, and read the "Power Resource VB" and all of the "Battery Block Vol", with the vehicle is stationary.

Powertrain > Hybrid Control > Data List

Tester Display
Power Resource VB
Battery Block Vol -V01
Battery Block Vol -V02
Battery Block Vol -V03
Battery Block Vol -V04
Battery Block Vol -V05
Battery Block Vol -V06
Battery Block Vol -V07
Battery Block Vol -V08
Battery Block Vol -V09
Battery Block Vol -V10
Battery Block Vol -V11
Battery Block Vol -V12
Battery Block Vol -V13
Battery Block Vol -V14
Battery Block Vol -V15
Battery Block Vol -V16
Battery Block Vol -V17

Result	Proceed to
Both of the following are satisfied: Sum of all "Battery Block Vol" is more than ("Power Resource VB" -45 V) Sum of all "Battery Block Vol" is less than ("Power Resource VB" +30 V)	A
The preceding condition is not satisfied.	B

(g) Turn the power switch off.

A

REPLACE INVERTER WITH CONVERTER ASSEMBLY

B

REPLACE BATTERY VOLTAGE SENSOR

READ NEXT: