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Q501 4 Cylinder MT Application
DTC Troubleshooting Data
Version: 0.1
Date: 21-Sep-2018
Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta
Checked By: Yogesh Jadhav
Approved By: Satish Kumar P
Page: 965 of 1052
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.
P2148-19: Fuel Injector Group “A” Supply Voltage Circuit High – Power stage high side (bank 0 error, circuit
current above threshold)
Overview:
DTC Description (User Friendly)
Power stage high side (bank 0 error, circuit current above
threshold)
ECU Pin Number
A064, A066.
Customer Symptom
Torque Limited, Cruise Control Off, MIL ON, Abnormal engine
noise and engine may not start.
Fault Effects (On Vehicle)
Reduced torque mode activated, Cruise control off, Abnormal
engine noise and engine may not start.
Lamp Status (If Any)
MIL ON
Fault Detection Condition (Root cause)
- Short Circuit to Battery supply of EMS ECU pin A64
or A66.
- Injector high side driver chip bank 1 burnt
Normal Operating Condition
No Fault
Probable Trouble Area
Wiring Harness connections between EMS ECU and Injector
cylinder 1 or injector cylinder 4
Injector Cylinder 1 or Injector cylinder 4
EMS ECU
Healing Condition
Rectify the error
Clear through diagnostic tool
Ignition OFF & ON
Component Details:
Injector is used for, Metering and spray preparation of the diesel fuel, which is needed by the engine
according to the engine map. Realisation of pilot and main injection, also post injection, if needed.
Controlling of injected quantity and injection timing, determined by system pressure and energizing time, actuated by the
ECU (Electronic Control Unit).
Preliminary Checks:
1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above
Table. If yes, go ahead with next steps. If not, check for other DTC’s presence.
2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with
respect to earlier issue closure.\
3. Check the wiring harness connections between EMS ECU and Cylinder 1 or 4 Injectors as per the circuit
Schematic.
4. Loose/ Damaged Connections between Cylinder 1 or 4 Injectors and EMS ECU.
5. Check for damage of pins at EMS ECU connector and Injector cylinder 1 or 4 connectors.
Trouble Shooting:
Step Checks
IF YES
IF NO
1
Check for any mechanical damage in Cylinder 1/4 injector
Call Hotline
Go to next step
2
Is there wiring harness electrical continuity between ECU
pin A64 & Cylinder 1 Injector connector pin 1, ECU
pin A66 & Cylinder 4 Injector connector pin 1.
Go to next step
Rectify the wiring
harness
connections as per
the circuit