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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: 621 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.
P0016-62: Crankshaft position – Camshaft position correlation – Offset between camshaft and crankshaft (signal
compare failure)
Overview:
DTC Description (User Friendly)
Offset between camshaft and crankshaft (signal compare
failure)
ECU Pin Number
A037, A052, A051; A020, A021
Customer Symptom
Possible no start condition. Engine noise.
Fault Effects (On Vehicle)
DPF regeneration Off, Reduced Torque Mode activated.
Lamp Status (If Any)
MIL OFF, CEL OFF, DPF lamp ON
Fault Detection Condition (Root cause)
Distortion detection is active when the engine is in cranking or
running.
Camshaft offset angle exceeded.
Normal Operating Condition
No Fault
Probable Trouble Area
Erratic camshaft position sensor signal
Erratic crankshaft position sensor signal
Misaligned timing chain
Damaged crankshaft timing teeth
Damaged camshaft timing sprocket
Camshaft position sensor
Crankshaft position sensor
EMS ECU faulty
Healing Condition
Rectify the error
Clear through diagnostic tool
Ignition OFF & ON
Component Details:
Camshaft Position Sensor:
A typical Hall Effect Sensor has three wires or terminals: one for ground, one for supply or reference voltage and one for
the output signal. To produce an output signal, a Hall Effect Sensor must be supplied with a reference voltage. When a
Metal/wheel passes through the air gap between the magnetic field (Magnet) and silicon chip (CAM sensor), it blocks the
Magnetic field and causes the chip’s output voltage to suddenly drop to zero else the chip's output voltage is 4.7 Volts.
Crankshaft Position Sensor:
This is fitted on the crankcase and faces the phonic wheel on the flywheel. It is inductive type, i.e. its operation is
determined by magnetic field changes generated by the teeth passing in front of the phonic wheel. The changeover from
full to empty determined by the presence or absence of a gap brings about a magnetic flux change sufficient to generate
an induced alternating voltage proportional to the number of teeth on the ring (or phonic wheel). The frequency and
amplitude of the voltage send to the electronic control unit provides the latter with an indication of the engine angular
speed. The sensor output signal approximates a sine wave whose frequency is proportional to engine speed and
amplitude is approximately proportional to engine speed. Active edge is generated from zero crossing point positive to
negative transition.
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.