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DTC C2020: Vacuum sensor power VOLT. (VP)
 
 
cautionWhenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets DTC C2020 when the power supply voltage to the brake booster vacuum sensor is abnormal.
 
 
 
PROBABLE CAUSES
  • Malfunction of the brake booster vacuum sensor.
  • Damaged harness or connector.
  • Malfunction of the PHEV-ECU.
 
 

 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Voltage measurement at PHEV-ECU connector (terminal VCSP).
(1) Measure the PHEV-ECU connector side by backprobing.
(2) Measure the voltage between the PHEV-ECU connector (terminal VCSP) and body ground.
OK: 4.9 - 5.1 volts (Power supply voltage)
Is the check result normal?
Replace the brake booster vacuum sensor (Refer to GROUP 35A - Master Cylinder Assembly and Brake Booster Assembly ).
Go to Step 2.
 
STEP 2. Check the signal line for open circuit and short to ground (Brake booster vacuum sensor and PHEV-ECU).
Check the harness between brake booster vacuum sensor connector (terminal No.3) and PHEV-ECU connector (terminal VCSP).
Is the check result normal?
Go to Step 3.
Repair the connector or wiring harness.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).