Node palette
Step
Decision
Measurement
Safety Gate
Outcome
Drag a node onto the canvas, then drag between handles to connect.
Step
Job card
HV isolation warning light, intermittent reduced power. Generic EV SUV, 350V pack, 18,412 km.
Safety Gate
HV safety gate
Five blocking checks: gloves, MSD removed, discharge wait, instruments verified, signage placed.
Step
DTC readout
P0AA6 Confirmed, P1E08 Confirmed, U0111 History. Select the fault to pursue first.
Decision
Next action
Isolation fault is confirmed. What is your next action.
Outcome
Consequence: pack replaced
Warranty claim rejected. Unnecessary parts spend Rs 5,50,000.
Outcome
Consequence: codes cleared
Unsafe. Clearing an active isolation fault returns a compromised HV barrier to the customer.
Step
Isolate compressor branch
Disconnect the AC compressor HV branch at the junction box.
Measurement
Insulation resistance test
Measure insulation resistance between compressor HV positive and chassis at 500V.
Step
Retest after reseat
Dry the connector, reseat the terminal and repeat the 500V test.
Step
Test another branch
This circuit reads healthy. Move to the next HV branch and retest.
Step
Root cause identified
Chafed compressor HV cable at the mounting bracket.
Decision
Repair decision
Select the repair that matches the service procedure.
Step
Verification
Reinstall MSD, final isolation retest, clear DTCs, road test to confirm.
Outcome
Scenario complete
Retest 14.2 MOhm PASS. Score and debrief presented to the technician.
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