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DTC C1800 Accele./Decele. monitor
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
OPERATION
The ASC-ECU receives target acceleration/deceleration signal via CAN bus lines from the ACC-ECU.
 
 
 
DTC SET CONDITIONS
The ASC-ECU compares an actual acceleration/deceleration signal with the target acceleration/deceleration signal, which is transmitted from the ACC-ECU. The ASC-ECU will store this DTC when these signals are significantly different.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of ACC-ECU
  • Malfunction of ASC-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) DTC of other system
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check that the DTC is set in the ACC-ECU.
Is the DTC set?
Troubleshoot for the relevant DTC. Refer to GROUP 17 - Adaptive Cruise Control System (ACC) .
Go to Step 2.
 
STEP 2. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Is DTC No.C1800 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 3.
This diagnosis is complete.
 
STEP 3. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Is DTC No.C1800 set?
Return to Step 1.
This diagnosis is complete.