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DTC No. P0A0A-00: Poor joint detector diagnosis
 
 
 
 
DTC SET CONDITION
Check Condition
  • During the BMU operation
Judgment Criterion
  • The malfunction of the engagement detection circuit is detected.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness and connectors
  • Malfunction of the service plug box
  • Malfunction of the drive battery front cable
  • Malfunction of the drive battery high voltage connector (front)
  • Malfunction of the drive battery rear cable (junction box)
  • Malfunction of the drive battery high voltage connector (rear)
  • Malfunction of the BMU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
1.Check of continuity at drive battery connector (control wiring harness connector)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the following for continuity.
  • Continuity between the drive battery connector (control wiring harness connector) (terminal No. 24) and body ground
  • Continuity between the drive battery connector (control wiring harness connector) (terminal No. 19) and body ground
OK: No continuity
Is the check result normal?
Repair the connector(s) or wiring harness between the drive battery and interlock connector.
 
2.Check of continuity at drive battery connector (control wiring harness connector)
(1) Disconnect the connector, and measure at the equipment side.
(2) Check the following for continuity.
  • Continuity between the drive battery connector (control wiring harness connector) (terminal No. 24) and body ground
  • Continuity between the drive battery connector (control wiring harness connector) (terminal No. 19) and body ground
OK: No continuity
Is the check result normal?
 
3.Check of drive battery front cable interlock circuit
(1) Disconnect the drive battery front cable from the drive battery, and measure at the cable side.
(2) Check the following for continuity.
  • Continuity between the drive battery front cable connector (interlock terminal) and body ground
OK: No continuity
Is the check result normal?
Replace the drive battery front cable (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION).
 
4.Check of drive battery rear cable (junction box) interlock circuit
(1) Disconnect the drive battery rear cable (junction box) from the drive battery, and measure at the cable side.
(2) Check the following for continuity.
  • Continuity between the drive battery rear cable (junction box) connector (interlock terminal) and body ground
OK: No continuity
Is the check result normal?
Replace the drive battery rear cable (junction box) (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION).
 
5.Check of drive battery engagement detection circuit
Check the drive battery engagement detection circuit (Refer to ENGAGEMENT DETECTION CIRCUIT CHECK (INSIDE OF DRIVE BATTERY)).
Is the check result normal?
Disassemble the drive battery (Refer to SERVICE PROCEDURE). After the disassembly, repair the connector(s) or wiring harness.
 
6.Check whether the DTC is set again.
(1) Erase the DTC set in the BMU2.
(2) Erase the DTC set in the BMU.
(3) Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
(4) Wait for 10 seconds or more.
(5) Check whether the DTC is set again.
Is the DTC set?
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).
 
7.Drive battery control wiring harness check (Engagement detection line)
(1) Disassemble the drive battery (Refer to SERVICE PROCEDURE).
(2) Disconnect the BMU connector, and measure at the control wiring harness side.
(3) Check the continuity for the following wiring harnesses.
  • Between the BMU connector (terminal No. 8) and body ground
  • Between the BMU connector (terminal No. 6) and body ground
OK: No continuity
Is the check result normal?
Replace the BMU (Refer to BATTERY MANAGEMENT UNIT (BMU) REMOVAL AND INSTALLATION).
Repair the connector(s) or wiring harness.
 
8.Check whether the DTC is set again.
(1) Erase the DTC set in the BMU2.
(2) Erase the DTC set in the BMU.
(3) Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
(4) Wait for 10 seconds or more.
(5) Check whether the DTC is set again.
Is the DTC set?
Replace the BMU (Refer to BATTERY MANAGEMENT UNIT (BMU) REMOVAL AND INSTALLATION).
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions Intermittent Incident)