TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

TATA BSVI Gasoline Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.2 Date: 18-12-2019 Prepared By: Sunita Mandlik Checked By: Yeshwant Jadhav Approved By: Satish Kumar Document Part No: 2921 02 xxx xxxx Page: 1146 of 1498 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. P1559-2A: Cruise control button stuck -SET-Cruise SW have been failed as SET button is held longer than the respective threshold time period-Circuit short to battery or open Overview: ISO Code P1559 – 2A Customer Symptom 1.Vehicle will come out of Cruise control. 2. Cruise Control Function will not work. Fault Effects (On Vehicle) 1.Vehicle will come out of Cruise control. 2. Cruise Control Function will not work. Lamp Status (If Any) CE lamp ON after 3 drive cycle Fault Detection Condition This fault gets logged either when the SET switch is stuck closed or EMS ECU SET switch control pin is SC to GND. Normal Operating Condition SET switch functions as per the design intention. Probable Trouble Area SET switch button, Wiring Harness Connections, EMS ECU Healing Condition After 1 Drive cycles and ignition ON Fault permanent deletion 1. Scan tool Service 14 2. Stack Over Flow. 3. 40 warm up cycles. 4. ECU flashing 5. ECU power fail Component Details: Cruise control switches are open non latchable switches. Whose electrical contacts will be closed when the switches is pressed. Cruise control (sometimes known as Speed Control or Autocruise) is a system that automatically controls th e speed o f a motor vehicle . The system is a servomechanism t hat takes over th e throttle o f the car to maintain a steady speed as set by the driver. 1. Check whether the SET switch is stuck in pressed condition. 2. Check for any damage of pins at EMS ECU connector / SET switch connector. 3. Check whether the EMS ECU connector / SET switch connector is damaged . Trouble Shooting:- Step Checks IF YES IF NO 1. Check whether the SET switch is stuck in pressed condition. Rectify/Replace the switch Go to step 2 2 Check whether the SET switch is sticky. Clean or replace the switch Go to step 3 3 Check the continuity between the EMS ecu pin 123 and Cruise control switches pin1. Also check the continuity between the Cruise control switches pin 2 and Ground. Is Continuity proper? Go to step 4 Establish continuity as per the circuit schematic. 4. Check whether the EMS ecu pin 123 is short circuited to Ground. Rectify the wiring harness connections as per the schematic Go to step 5 5. Fault still persists? Replace SET switch. IF fault still persists then replace EMS ecu Confirm the above procedure for fault Rectification. DTC’s confirmation:- 4. After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing over to customer. 5.