Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HYBRID VEHICLE CONTROL ECU (VOLTAGE CHECK)

Turn the ignition switch to the ON position.

Measure the voltage according to the value(s) in the table below.

Standard voltage

HYBRID VEHICLE CONTROL ECU (VOLTAGE CHECK)

Tester Connection	Specified Condition
AS1G (H32-34) - AS1 (H32-27)	2.3 to 3.1 V

Fig 1: Inspecting Hybrid Vehicle Control ECU (Voltage Check)

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NG: Go to step 4

OK: GO TO NEXT STEP

CLEAR DTC (HV)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CLEAR CODES.
RECONFIRM OUTPUT DTCS (HV)
1. Turn the ignition switch to the ON position.
2. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES.
3. Read output DTCs. (See DTC CHECK / CLEAR )
  Result:
  
  P3137-348 and P3138-349 are output.
NO: CHECK FOR INTERMITTENT PROBLEMS

YES: REPAIR HYBRID VEHICLE CONTROL ECU

INSPECT CIRCUIT BREAKER SENSOR NO. 1

Turn the ignition switch off.
Disconnect the C17 circuit breaker sensor No. 1 connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

CIRCUIT BREAKER SENSOR NO. 1

Tester Connection	Specified Condition
SIF- (C17-1) - SIF+ (C17-2)	0.65k to 1.0 kΩ at 20°C (68°F)

Fig 2: Inspecting Circuit Breaker Sensor No. 1

NG: REPLACE CIRCUIT BREAKER SENSOR NO. 1

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR