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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:
1.
Blinking of CKNL / Service Lamp: Severe error. Ignition to be switched off. Vehicle to be taken for diagnosis immediately. (Except for high vehicle speed.)
2.
Continuous glowing of CKNL / Service Lamp: Vehicle to be taken for diagnosis as soon as possible.
3.
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.
4.
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.
5.
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.