NANO

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. of range 2)Alternator signal line Short to Battery/ Ground. 3)Check for back out of pins at both Alternator signal line P0625 Alternator Circuit Low Short Circuit OFF 54 YES 1. Idle could be affected connector and ECU connector to Ground 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 for Tata 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 Coolant Temperature 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.