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Diagnosis Item 13: Communication with no ECUs is possible (EV-CAN).
 
 
cautionWhen servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.
 
 
TROUBLESHOOTING HINTS
  • Malfunction in EV-CAN (short to ground or power supply, wire short to one another)
  • Malfunction in the ECUs which are interconnected via EV-CAN (internal error)
  • Malfunction (open circuit) of wiring harness, connector (s) between the PHEV-ECU and joint connector(s)
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check the EV-CAN for short to power supply. Voltage measurement at PHEV-ECU connector by backprobing.
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Connect the negative 12V starter battery terminal, and turn on the power supply mode of the electric motor switch.
(2) Voltage between PHEV-ECU connector terminal No.53 (CAN_H) and body ground by backprobing
OK: Less than 4.0 V
(3) Voltage between PHEV-ECU connector terminal No.52 (CAN_L) and body ground by backprobing
OK: Less than 4.0 V
(4) Disconnect the negative 12V starter battery terminal.
Is the check result normal?
Go to Step 2.
Perform diagnosis item 14 "Diagnose shorts in the power supply to EV-CAN". Refer to .
 
STEP 2. Check the EV-CAN for short to ground. Resistance measurement at PHEV-ECU connector by backprobing.
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Turn off the power supply mode of the electric motor switch.
(2)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(3) Resistance between PHEV-ECU connector terminal No.53 (CAN_H) and body ground by backprobing
OK: 1 kΩ or more
(4) Resistance between PHEV-ECU connector terminal No.52 (CAN_L) and body ground by backprobing
OK: 1 kΩ or more
Is the check result normal?
Go to Step 3.
Perform diagnosis item 15 "Diagnose shorts in the ground to EV-CAN". Refer to .
 
STEP 3. Check the EV-CAN for short to each other. Resistance measurement at PHEV-ECU connector by backprobing.
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Turn off the power supply mode of the electric motor switch.
(2)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(3) Resistance between PHEV-ECU connector terminal Nos.53 and 52 by backprobing
OK: 60 ± 10 Ω
Is the check result normal?
: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
: Perform diagnosis Item 16 "Diagnose shorts between CAN_H and L lines (EV-CAN)". Refer to .
: Check the wires between PHEV-ECU connector and joint connector (CAN2) for open circuit, and check the terminal resistors in the PHEV-ECU and the BMU for open circuit. Then repair or replace if necessary.