DTC B1498/98: Communication Malfunction (A/C Inverter Local): Procedure

1. Using the Techstream, check if the CAN communication system is functioning normally.

   Result

   Result	Proceed to
   CAN DTC is not output	A
   CAN DTC is output (w/ Smart Key System)	B
   CAN DTC is output (w/o Smart Key System)	C

B → See step   11 

C → See step   16 

A: Go to next step 

1. Using the Techstream, check if the hybrid control system is functioning normally.

   Result

   Result	Proceed to
   DTC is not output	A
   Only DTC P3108-536 is output	A
   DTCs other than P3108-536 are output	B

B → See step   12 

A: Go to next step 

1. Remove the A/C NO. 2 fuse from the instrument panel junction block.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Item	Condition	Specified Condition
   A/C NO. 2 fuse	Always	Below 1 Ω

NG → REPLACE FUSE (A/C NO. 2) 

OK: Go to next step 

Fig 1: Identifying Harness And Connector (Compressor With Motor Assembly - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the B48 compressor connector.
   WARNING:

   Do not disconnect the connector on the high-voltage side.

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B48-5 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the ignition switch to ON.
   Fig 2: Identifying Harness And Connector (IG1 - GND)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   B48-6 (IG1) - B48-5 (GND)	Ignition switch ON	11 to 14 V
   B48-6 (IG1) - B48-5 (GND)	Ignition switch off	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A65 hybrid vehicle control ECU connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying Harness And Connector (Hybrid Vehicle Control ECU - Compressor With Motor Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B48-1 (CLK) - A65-19 (CLK)	Always	Below 1 Ω
   B48-2 (DIN) - A65-31 (ITE)	Always	Below 1 Ω
   B48-3 (DOUT) - A65-30 (ETI)	Always	Below 1 Ω
   B48-1 (CLK) - Body ground	Always	10 kΩ or higher
   B48-2 (DIN) - Body ground	Always	10 kΩ or higher
   B48-3 (DOUT) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the ignition switch off.
2. Remove the service plug grip. Refer to REMOVAL .
   WARNING:

   • Be sure to wear insulated gloves.
   • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.
   NOTE:

   After removing the service plug grip, turning the ignition switch to ON (READY) may cause a malfunction. Do not turn the ignition switch to ON (READY) unless instructed by the repair information.

3. Remove the inverter cover assembly. Refer to REMOVAL .
   WARNING:

   • Be sure to wear insulated gloves.
   • Verify that the voltage of the inverter with converter assembly is 0 V before working inside the inverter with converter assembly.
   Fig 4: Measuring Voltage Of Converter Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   Be sure to prevent foreign objects or liquid from entering the inverter with converter assembly.

4. Check that bolts A and B are tightened securely.
   Fig 5: Identifying A And B Bolts

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Item (Tester Connection)	Condition	Specified Condition
   ELECTRIC VEHICLE fuse (A - B)	Always	Below 1 Ω

NG → REPLACE ELECTRIC VEHICLE FUSE 

OK: Go to next step 

1. Remove the inverter with converter assembly. Refer to REMOVAL .
   Fig 6: Measuring Resistance Of Inverter With Converter Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   i3-2 (ACPE) - j8-1 (CEI)	Always	Below 1 Ω
   i3-1 (ACPB) - j8-2 (CBI)	Always	Below 1 Ω

NG → See step   13 

OK: Go to next step 

1. Disconnect the i1 compressor connector.
   Fig 7: Identifying Harness And Connector (Compressor With Motor Assembly - Inverter With Converter Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   WARNING:

   Be sure to wear insulated gloves.

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   i1-1 (PE) - i3-2 (ACPE)	Always	Below 1 Ω
   i1-2 (PB) - i3-1 (ACPB)	Always	Below 1 Ω
   i1-1 (PE) - Body ground	Always	10 kΩ or higher
   i1-2 (PB) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the B48 compressor connector.
   Fig 8: Inspecting Compressor With Motor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Using an oscilloscope, check the waveform according to the following tables.
   Fig 9: Identifying Waveform 1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Contents
   Tester Connection	CH1: A65-19 (CLK) - Body ground CH2: A65-31 (ITE) - Body ground
   Tool Setting	10 V/DIV., 100 ms./DIV.
   Vehicle Condition	Ignition switch ON (READY), with air conditioning system operating

   HINT: 

   Waveform cycle varies with the communication contents.

NG → See step   14 

OK → See step   15