NANO VOLUME 1 & 2

ENGINE 273 MPFI

286

P Code Description as per ISO/SAE

Fault cause MIL /

Blink Diag Detection / Customer Effect

Probable Trouble area

Check Code Tool

for

BS-III-IV

P0622

Alternator PWM Signal Error

Signal out

OFF 54 YES 1. Idle could be affected

1) Loose /Damaged connector.

ofrange

2)Alternator signal line Short to Battery/ Ground.

3)Check for back out of pins at bothAlternator signal line

P0625

Alternator Circuit Low

Short Circuit

OFF 54 YES 1. Idle could be affected

connector and ECU connector

toGround

4) FaultyAlternator

P0626

Alternator Circuit High

Short Circuit

OFF 54 YES 1. Idle could be affected

to Battery

P0686

ECM/PCM Power Relay Control Circuit Low Sticky main

ON 62 YES

1.In

long term ECU and can be damaged.

1. Check relay control pin short to ground

relay

2. Check Main relay

P1301

Max error (SCB) in IGBT Channel with faulty

Short Circuit

ON 31 YES 1. Engine shuts off and can be only started after Ignition switch 1) Loose /Damaged connector.

system voltage

to Battery

resetting or coil has cooled down.

2) IGN Coil supply line short to Battery/Ground

2. Misfires may happen

3) IGN Coil Control line Short to Battery/ Ground.

4) Check the continuity from Ignition Coil connector pins

to the ECU pins ( ECU pin 55-Ignition Coil pin 2).12 volts

should come at ignition ON.

5) Check for back out of pins at both Ignition Coil

connector and ECU connector.

6) Faulty Ignition Coil/ HT Leads/ Spark Plugs.

7) Faulty ECU

Important Notes:

Blinking of CKNL / Service Lamp: Severe error. Ignition to be switched off. Vehicle to be taken for diagnosis immediately. (Except for high vehicle speed.)

Continuous glowing of CKNL / Service Lamp: Vehicle to be taken for diagnosis as soon as possible.

When misfire is detected, the CKNL / Service Lamp as well as the high water temperature lamp will start blinking and the buzzer will ON to warn the driver. The vehicle will go in limp mode. In this case the vehicle to be taken for

diagnosis immediately.

The top speed forTata Nano is 105 Km/Hr.Attempt of exceeding the speed beyond 105 Km/Hr will blink the CKNL / Service Lamp, High water temperature lamp and the buzzer ON.The vehicle speed will be limited to 105 Km/Hr.

It is recommended not to drive the vehicle at top speed.

If the Engine CoolantTemperature goes above 114 Degree C, the High water temperature lamp will start blinking & buzzer will turn ON. In this case the vehicle to be taken for diagnosis immediately.

DRIVING CYCLE FLC-A DRIVING CYCLE consists of engine start up Driving mode where malfunction is detcted if present and engine shut off.

WARM UP CYCLE- A WARM UP CYCLE means sufficient vehicle opearation such that the coolant temperature as risen by atleast 22 deg. Of engine starting and reach at least a temperature of 70 deg.

HEALING CYCLE- A HEALING CYCLE consists of engine start up Driving mode where malfunction is tested ok and engine shut off.