1422-1423 / 1904
ENGINE
DTC
DESCRIPTION
CAUSE
DIAGNOSTIC
LAMP (
MIL
)
DIAGNOSTIC
LAMP (
CEL
)
Gil When
Driven In CNG
PROBABLE TROUBLE AREA
P0053
Upstream Oxygen
Sensor Heater
Resistance too
high.
Resistance too high
OFF
ON
.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/ Ground.
4) Check for back out of pins at both Sensor connector and ECU connector.
5) Check for damage of pins at both sensor connector and ECU connector.
6) Check the continuity from sensor connector pins to the ECU pins. ( ECU pin 155- Sensor Pin 1; ECU pin 246- Sensor Pin 2; ECU Pin
204- Sensor Pin 3; ECU pin 230- Sensor pin 4)
7) Faulty HO2S Sensor.
8) Faulty ECU
P0054
Downstream
Oxygen Sensor
Heater Resistance
too high.
Resistance too high
OFF
ON
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/ Ground.
4) Check for back out of pins at both Sensor connector and ECU connector.
5) Check for damage of pins at both sensor connector and ECU connector.
6) Check the continuity from sensor connector pins to the ECU pins. (ECU pin 155- Sensor Pin 1; ECU pin 239- Sensor Pin 2; ECU Pin
206-Sensor Pin 3; ECU pin 202- Sensor pin 4)
7) Faulty HO2S Sensor.
8) Faulty ECU
P0087
Rail pressure low
(Minimum
Threshold)
System Pressure
Too Low
OFF
ON
OFF
1) Check defective or Faulty Pressure Regulator.
2) Check hose connection from Pressure regulator to Rail.
3) Due to Internal leakage of PR Valve
P0088
Rail pressure
Exceeds
(Maximum
Threshold
System Pressure
Too High
OFF
ON
OFF
P0106
Manifold Pressure
sensor signal Non
Plausible
NPL / Non
Plausible Error
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.(ECU pin 103-Sensor pin 1; ECU pin 227-Sensor Pin 2; ECU pin 125-
Sensor pin 3 ECU pin 112- Sensor Pin 4).
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 TMAP Sensor.
8) Faulty ECU
P0107
Manifold Pressure
sensor short to
ground or signal
error
Short Circuit to
Ground/No signal
detected
ON
OFF
ON
P0108
Manifold Pressure
sensor short to
battery/ Sensor
Supply.
Short Circuit to
Battery/Sensor
Supply
ON
OFF
ON