Lexus ES: High Voltage Power Resource Circuit Consumption Circuit Short (P1C8149,P1C8249)
DTC SUMMARY
MALFUNCTION DESCRIPTION
The hybrid vehicle control ECU monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects a short circuit malfunction or high-voltage system operation malfunction.
The cause of this malfunction may be one of the following:
- Battery current sensor (IB) malfunction
- Motor generator control ECU (MG ECU) malfunction
- Communication (wire harness) malfunction
- HV battery malfunction
- HV battery junction block assembly malfunction
- Inverter with converter assembly malfunction
- Air conditioner system malfunction
- High-voltage wire harness malfunction
- High-voltage connector or connection malfunction
- Hybrid vehicle control ECU malfunction
- Low voltage wire harness malfunction
- Low voltage connector malfunction
INSPECTION DESCRIPTION
| System Diagram Location | Inspection Content | Reason | Inspection Step |
|---|---|---|---|
| *a | Check high-voltage wiring connection condition of the air conditioner compressor with motor assembly | Check for short circuit | 2, 4 |
| *b | Check the high voltage cables between the HV battery junction block assembly and inverter with converter assembly. | Check for short circuit | 3, 5 |
DESCRIPTION
Refer to the description for DTC P0AE411.
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P1C8149 | High Voltage Power Resource Circuit Consumption Circuit Short | High-voltage circuit malfunctions between the HV battery and inverter with converter assembly. Excessive overcurrent equal to a short occurs during precharge (time from when SMRP turns on until SMRG turns on). (1 trip detection logic) |
| Does not come on | Master Warning Light: Comes on |
| P1C8249 | High Voltage Power Resource Circuit Over Loading | High-voltage circuit malfunctions between the HV battery and inverter with converter assembly. Small battery overcurrent occurs during precharge (time from when SMRP turns on until SMRG turns on) and current continues to flow after precharge. (1 trip detection logic) |
| Does not come on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P1C8149 |
|
| P1C8249 |
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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- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (READY) and wait for 30 seconds or more.
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
-
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 or N/A, perform driving pattern again.
WIRING DIAGRAM
Refer to the wiring diagram for DTC P0AA649.
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CAUTION / NOTICE / HINT
CAUTION:
-
Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
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- Inspecting the high-voltage system
- Disconnecting the low voltage connector of the inverter with converter assembly
- Disconnecting the low voltage connector of the HV battery
-
To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
-
After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
-
After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
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HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
*a
Without waiting for 10 minutes
- If this DTC is output, do not turn the power switch on (READY) until the repair has been completed. This DTC means an excessive amperage flow through the system main resistor. The system main resistor may overheat and be damaged if the power switch is turned on (READY) repeatedly before repair.
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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PROCEDURE
| 1. | CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control and Motor Generator / Trouble Codes.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes Powertrain > Motor Generator > Trouble Codes| Result | Proceed to |
|---|---|
| P1C8149 or P1C8249 only is output, or DTCs except the ones in the tables below are also output. | A |
| DTCs of hybrid control system in the tables below are output. | B |
| DTCs of motor generator control system in the tables below are output. | C |
| Malfunction Content | System | Relevant DTC | |
|---|---|---|---|
| Microcomputer malfunction | Hybrid control system | P060647 | Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure |
| P0AFC96 | Hybrid/EV Battery Sensor Module Component Internal Failure | ||
| P0AFC00 | Hybrid/EV Battery Sensor Module | ||
| Power source circuit malfunction | Hybrid control system | P0AFC16 | Hybrid/EV Battery Sensor Module Circuit Voltage Below Threshold |
| Communication system malfunction | Hybrid control system | U029A87 | Lost Communication with Hybrid/EV Battery Sensor Module Missing Message |
| Sensor and actuator circuit malfunction | Hybrid control system | P0ABF11 | Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground |
| P0ABF15 | Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open | ||
| P0B3B14 | Hybrid/EV Battery Voltage Sensor "A" Circuit Short to Ground or Open | ||
| P0B4014 | Hybrid/EV Battery Voltage Sensor "B" Circuit Short to Ground or Open | ||
| P0B4514 | Hybrid/EV Battery Voltage Sensor "C" Circuit Short to Ground or Open | ||
| P0B4A14 | Hybrid/EV Battery Voltage Sensor "D" Circuit Short to Ground or Open | ||
| P0B4F14 | Hybrid/EV Battery Voltage Sensor "E" Circuit Short to Ground or Open | ||
| P0B5414 | Hybrid/EV Battery Voltage Sensor "F" Circuit Short to Ground or Open | ||
| P0B5914 | Hybrid/EV Battery Voltage Sensor "G" Circuit Short to Ground or Open | ||
| P0B5E14 | Hybrid/EV Battery Voltage Sensor "H" Circuit Short to Ground or Open | ||
| P0B6314 | Hybrid/EV Battery Voltage Sensor "I" Circuit Short to Ground or Open | ||
| P0B6814 | Hybrid/EV Battery Voltage Sensor "J" Circuit Short to Ground or Open | ||
| P0B6D14 | Hybrid/EV Battery Voltage Sensor "K" Circuit Short to Ground or Open | ||
| P0B7214 | Hybrid/EV Battery Voltage Sensor "L" Circuit Short to Ground or Open | ||
| P308A13 | Hybrid/EV Battery Voltage Sensor All Circuit Open | ||
| P0AFC62 | Hybrid/EV Battery Sensor Module Signal Compare Failure | ||
| P0B231C | Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range | ||
| P308A12 | Hybrid/EV Battery Voltage Sensor All Circuit Short to Auxiliary Battery | ||
| P0ABF00 | Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance | ||
| P0ABF28 | Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure | ||
| P0ABF2A | Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range | ||
| Motor generator control system | P0A1114 | DC/DC Converter Enable Circuit Short to Ground or Open | |
| P0A1112 | DC/DC Converter Enable Circuit Short to Battery | ||
| P1CCC96 | DC/DC Converter Enable Component Internal Failure | ||
| System malfunction | Motor generator control system | P0D3319 | DC/DC Converter Circuit Current Above Threshold |
HINT:
-
P1C8149 or P1C8249 may be output as a result of the malfunction indicated by the DTCs above.
- The chart above is listed in inspection order of priority.
- Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)
(e) Turn the power switch off.
| B | .gif) | GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
| C | | GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM) |
|
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| 2. | CHECK COMPRESSOR WITH MOTOR ASSEMBLY |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
| (b) Disconnect the air conditioning wire connector from the inverter with converter assembly. |
|
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
NOTICE:
|
|
(d) Reconnect the air conditioning wire connector.
| NG | | GO TO STEP 4 |
|
| 3. | CHECK FLOOR UNDER WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
| (b) Disconnect the HV floor under wire connector from the inverter with converter assembly. |
|
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
NOTICE: Be sure not to damage or deform the terminal being inspected. |
|
(d) Reconnect the HV floor under wire connector.
| OK | | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
| NG | | GO TO STEP 5 |
| 4. | CHECK HV AIR CONDITIONING WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
| (b) Disconnect the HV air conditioning wire connector from the inverter with converter assembly. |
|
| (c) Disconnect the HV air conditioning wire from the compressor with motor assembly. Click here |
|
| (d) Measure the resistance according to the value(s) in the table below. Standard Resistance:
NOTICE: Be sure to inspect with connecting the tester probes to the tips of the terminal. |
|
(e) Reconnect the HV air conditioning wire connector to the inverter with converter assembly.
(f) Reconnect the HV air conditioning wire to the compressor with motor assembly.
| OK | | REPLACE COMPRESSOR WITH MOTOR ASSEMBLY |
| NG | | REPLACE HV AIR CONDITIONING WIRE |
| 5. | CHECK FLOOR UNDER WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Remove the No. 1 HV battery cover panel RH.
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| (c) Disconnect the HV floor under wire connectors from the HV battery junction block assembly. |
|
| (d) Disconnect the HV floor under wire connector from the inverter with converter assembly. |
|
| (e) Measure the resistance according to the value(s) in the table below. Standard Resistance:
NOTICE: Be sure not to damage or deform the terminal being inspected. |
|
(f) Reconnect the HV floor under wire connector to the inverter with converter assembly.
(g) Reconnect the HV floor under wire connectors to the HV battery junction block assembly.
(h) Install the No. 1 HV battery cover panel RH.
| OK | | REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY |
| NG | | REPLACE FLOOR UNDER WIRE |
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