Lexus NX: Hybrid Battery Voltage Isolation Sensor Circuit (P0AA7-727)
DESCRIPTION
The hybrid vehicle control ECU monitors the insulation monitoring circuit located in the battery voltage sensor and detects malfunctions.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P0AA7-727 | Hybrid Battery Voltage Isolation Sensor Circuit | Malfunction in the insulation monitoring circuit in the battery voltage sensor (1 trip detection logic) | Battery voltage sensor | Does not come on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P0AA7-727 | Short Wave Highest Val |
CAUTION / NOTICE / HINT
HINT:
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
- Turn the power switch on (IG) and wait for 70 seconds or more.
PROCEDURE
| 1. | CLEAR DTC |
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| 2. | SIMULATION TEST |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) and wait for 1 minute or more.
NOTICE:
Do not turn the power switch off until step 3 is complete.
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
Powertrain > Hybrid Control > Trouble Codes| P0AA7-727 is output. | .gif) | REPLACE BATTERY VOLTAGE SENSOR |
|
| 3. | SIMULATION TEST |
NOTICE:
Do not turn the power switch off while performing this inspection.
(a) With the vehicle and engine stopped, turn the power switch on (READY) with the shift lever in P and wait for 1 second or more. (If the engine starts, wait until the engine stops.)
(b) While depressing the brake pedal without depressing the accelerator pedal, move the shift lever to D and wait for 1 minute. (Step A)
(c) Drive the vehicle 0.5 m (1.6 ft.) forward and perform step A.
(d) Drive the vehicle another 0.5 m (1.6 ft.) forward and perform step A. Repeat this procedure 5 times (minimum total driving distance: 2 m (6.6 ft.)).
(e) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(f) Check if DTCs are output.
Powertrain > Hybrid Control > Trouble Codes| P0AA6 is not output. | | REPLACE BATTERY VOLTAGE SENSOR |
| P0AA6 is output. | | GO TO DTC CHART (P0AA6) |
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