1448-1449 / 1904
ENGINE
DTC
DESCRIPTION
CAUSE
DIAGNOSTIC
LAMP (
MIL
)
DIAGNOSTIC
LAMP (
CEL
)
Gil When
Driven In CNG
PROBABLE TROUBLE AREA
P1108
Rail pressure
sensor Open/
Short circuit
Short Circuit"
ON
OFF
ON
1) Loose/ Damaged Connections or Intermittent fault.
2) Sensor supply line Short circuit to Battery/ Ground.
3) Sensor Signal line Short circuit to Battery/ Sensor Supply/Ground.
4) Check the continuity from sensor connector pins to the ECU pins. (CNG rail pressure sensor ECU pin 225)
5) Check for back out of pins at both Sensor connector and ECU connector.
6) Check for damage of pins at both sensor connector and ECU connector.
7) Faulty Rail Pressure sensor.
8) Faulty ECU.
P1171
Less fuel quantity
than required –
CNG Mode
----
OFF
ON
OFF
1. Blocked fuel line
2.Bad fuel regulator
3. Blocked/leaking injectors
4.Injector delay time not correct
5.Air leakage through intake
P1172
Higher fuel
quantity than
required – CNG
Mode
----
OFF
ON
OFF
P1187
More air quantity
or less fuel
quantity at idle –
CNG
OFF
ON
ON
1. Blocked fuel line
2. Bad Pressure Regulator.
3. Blocked/leaking injectors
4.Injector delay time not correct
5.Air leakage through intake
P1188
Less air quantity
or more fuel
quantity at idle -
CNG
OFF
ON
ON
P1200
Engine
overheating,
Coolant
temperature over
110 deg C
Engine overheat
OFF
ON
(Blinking)
ON
1. Check cooling FAN.
2.Check radiator coolant level
3. Check engine OIL level.
4. Check for leakages in Coolant hoses.
P1201
Engine shutoff
due to
overheating,
Coolant temp over
120 deg C
Engine overheat
OFF
ON
(Blinking)
ON
P1202
CNG Cylinder 1
Injector Open /
Short circuit to
battery
Open Circuit Short
to battery
ON
OFF
OFF
1) Loose/ Damaged Connections or Intermittent fault.
2) INJ supply line Short circuit to Battery/ Ground.
3) INJ control line Short circuit to Battery/ Ground.
4) Check the continuity from injector connector pins to the ECU pins.(ECU pin 224-Injector 1 Pin; ECU pin 212- Injector 2 pin). 12 volts
should come at the remaining individual pins of the injectors.
5) Check for back out of pins at both Sensor connector and ECU connector.
6) Check for damage of pins at both sensor connector and ECU connector.
7) Faulty INJ.
8) Faulty ECU
P1203
CNG Cylinder 1
Injector short to
ground
Short Circuit to
Ground
ON
OFF
OFF