Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 419 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent P0576-00: Cruise Control Input Circuit Low– Cruise Control Input Short To Ground Overview: ISO Code P0576 Customer Symptom(s) Cruise not working Fault Effect(s) (On Vehicle) Deactivates the cruise control system, Cruise is available again if fault disappears Lamp Status MI Lamp OFF & CE Lamp OFF Fault Detection Condition(s) This DTC gets logged if EMS ECU detects Cruise Switch Short To Ground for a too long time. Normal Operating Condition(s) Cruise control function working normal with No DTCs Probable Trouble Area(s) Cruise control switches, Wiring harness & EMS ECU Healing Condition(s) Rectify the DTCs, Clear the DTCs using diagnostic tool, Ignition ON/OFF Component Details: Cruise control allows the vehicle to be driven at a constant speed. It controls the vehicle speed to the speed selected by the driver without him/her needing to press the accelerator pedal. The injected fuel quantity is either increased or decreased until the desired (set) speed is reached. The driver can set the required speed by pressing cruise control buttons on the steering wheel. If the driver presses the clutch or brake pedal while cruise control is activated, control is terminated. The cruise control switches on the steering control provide the user information requested to EMS ECU. Preliminary Checks: 1. Verify the customer concern on the vehicle 2. Save the failure record (DTCs, Freeze frame data etc.) using the diagnostic tool 3. Look for any loose or corroded connections, damaged pins, terminal back out, mouth open, broken connectors, blown fuses, faulty relays, unusual noises, vibrations, smells etc. in the probable trouble area(s) 4. Check the vehicle service history if there is any work done in the past related to the customer concern 5. Follow the steps as per the trouble shooting procedure Trouble Shooting: Step Checks If Yes If No 1 Check if there cruise switch on steering wheel is mechanically stuck or damaged? Replace cruise switch on steering wheel Go to Step 2 2 Check if the wiring harness connector is properly connected to the cruise switch & no damage or pin back out? Go to Step 3 Do the necessary repair 3 Check if there is any oxidation, rust, mud, dirt, foreign particle accumulation on the connector? Do the necessary repair Go to Step 4 4 Check if the wiring harness connector is properly connected to the EMS ECU, & no damage or pin back out? Go to Step 5 Do the necessary repair 5 Check if the electrical continuity between the EMS ECU pins A61, A18 and the cruise switch is ok? Go to Step 6 Do the necessary repair 6 Check if the EMS ECU pin A61 is short circuit to ground? Do the necessary repair Go to Step 7
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