NEXON DIAGNOSTIC MANUAL

OSPREY- Application

DTC Troubleshooting Data

Version: 4.0

Date: 10-02-2017

Prepared by: Mithipati Prasad

Checked by: G S Raju / Senthilnathan S

Page: 252 of 654

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.

P0500: Vehicle speed signal - Plausibility fault.

Overview:

DTC Description as per ISO standard

Vehicle Speed Sensor “A” Range/Performance

ECU Pin Number

Customer Symptom

No Speedo Display, No Current gear display, No gear shift indication, Loss

of Power.

Fault Effects (On Vehicle)

Possibly No Speedo Display.

EGR is disabled

Current Gear display feature will not work.

GSI feature will not work

Injector learning strategy is deactivated,

MDP, Speed Pilot Control Updation is deactivated

Reduced torque mode [Restricted performance]

Lamp Status (If Any)

CE lamp is on

Fault Detection Condition

This DTC will get logged if EMS ECU gets implausible speed signal from

IPC

Normal Operating Condition

No Faults related to vehicle speed signal

Probable Trouble Area

Vehicle speed sensor (non ABS vehicle), Instrument Cluster (Non-ABS

Vehicle), ABS ECU (ABS vehicle), Wheel Speed Sensors (ABS vehicle),

EMS ECU. Relevant Wiring harness connections.

Healing Condition

Clear the errors, Ignition OFF to ON, engine idle, fly-up and specially

vehicle running in different speed condition

Component Details:

Vehicle speed sensor detects vehicle speed based on rotation. 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

, it blocks the magnetic field and causes the chip’s output voltage to suddenly drop

to zero else the chip's output voltage is 12 Volts. So, it produces a near square wave/ pulses, which will be counted and

vehicle speed is calculated.

Preliminary Checks

Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If

yes, go ahead with next steps. If not, check for other DTC’s presence.

Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to

earlier issue closure. Check for pin back out at EMS ecu connector or EGR valve connector.

Perform the preliminary checks mentioned in the vehicle speed failure logged by Instrument Cluster ecu.