DTC P0AE2-773: Hybrid Battery Precharge Contactor Circuit Stuck Closed: Procedure

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair service information because this may cause a malfunction.

2. Disconnect connector z26, z27 and z28 from the hybrid battery junction block assembly.
   Fig 1: Identifying z26, z27 & z28 Hybrid Battery Junction Block Assembly Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying z26 & z28 Hybrid Battery Junction Block Assembly Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   z28-1 (INR) (Precharge +) (Negative probe) - z26-1 (CED) (High voltage -) (Positive probe)	Power switch off	10 kΩ or higher

   HINT: 

   • The polarities of the tester probes may differ depending on the tester. Use the current output probe of the tester as the positive probe for this measurement. To determine the polarity, use another voltmeter to confirm the current output probe of the tester. When measuring the output of the tester, the voltmeter positive probe indicates the tester current output probe.
   • If the resistance is between 28.5 and 31.5 Ω, it can be determined that the SMRP is stuck closed.

NG → See step   4 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK → See step   4