STEP 1. Resistance measurement at heater controller assembly (A/C-ECU) connector.
(1) Remove the heater controller assembly (A/C-ECU) connector, and measure at the wiring harness side.
(2) Resistance between heater controller assembly (A/C-ECU) connector terminal RRAT and SENG.OK: 11.0 - 11.7 Ω
Is the check result normal?
Go to Step 6. Go to Step 2.
STEP 2. Resistance measurement at main drive lithium-ion battery connector.
(1) Remove the main drive lithium-ion battery connector, and measure at the main drive lithium-ion battery side.
(2) Resistance between main drive lithium-ion battery connector terminal RRAT line and SENG line.OK: 11.0 - 11.7 Ω
Is the check result normal?
Go to Step 3. Go to Step 5.
STEP 3. Check of open and short circuit in RRAT - line between the main drive lithium-ion battery fin thermo sensor (in the evaporator) and the heater controller assembly (A/C-ECU) connector.
STEP 4. Check of open and short circuit in SENG line between the main drive lithium-ion battery fin thermo sensor (in the evaporator) and the heater controller assembly (A/C-ECU) connector.
STEP 5. Resistance measurement at main drive lithium-ion battery fin thermo sensor (in the evaporator) connector.
STEP 6. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn the electric motor switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-IIISE). |
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE)
".
(2) Turn the electric motor switch from OFF position to ON position.
(3) Check the DTC.
(4) Turn the electric motor switch to the OFF position.
Is the DTC set?
Replace the heater controller assembly (A/C-ECU) (Refer to ). Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions ).