1454-1455 / 1904
ENGINE
DTC
DESCRIPTION
CAUSE
DIAGNOSTIC
LAMP (
MIL
)
DIAGNOSTIC
LAMP (
CEL
)
Gil When
Driven In CNG
PROBABLE TROUBLE AREA
P1640
CNG Tank Valve
1 Open / Short
circuit to battery
Open Circuit Short
to battery
OFF
ON
ON
valves to ECU pin 156)
5) Check for back out of pins at both Actuator connector and ECU connector.
6) Check for damage of pins at both Actuator connector and ECU connector.
7) Faulty CNG Tank Valves.
8) Faulty ECU
P1641
CNG Tank Valve
2 Short circuit to
Ground
Short to Ground
OFF
ON
ON
P1642
CNG Tank Valve
2 Open / Short
circuit to battery
Open Circuit Short
to battery
OFF
ON
ON
P1643
CNG Pressure
Regulator Shut
Off Valve Open /
Short circuit to
battery
Open Circuit Short
to battery
OFF
ON
OFF
1) Loose/ Damaged Connections or Intermittent fault.
2) Actuator supply line Short circuit to Battery/ Ground.
3) Actuator Signal line Short circuit to Battery/ Actuator Supply/Ground.
4) Check the continuity from Actuator connector pins to the ECU pins.(CNG pressure regulator pin 2 to ECU pin 240 & regulator pin 1 to
ECU pin 156)
5) Check for back out of pins at both Actuator connector and ECU connector.
6) Check for damage of pins at both Actuator connector and ECU connector.
7) Faulty High Pressure regulator.
8) Faulty ECU
P1644
CNG Pressure
Regulator Shut off
Valve short to
Ground error
Short to Ground
OFF
ON
OFF
P2187
More air quantity
or less fuel
quantity at idle –
Gasoline Mode
Injector delay time
incorrect /Air intake
leakage/MAP
sensor offset
incorrect.
OFF
ON
ON
1. Blocked fuel line
2.Bad fuel regulator
3. Blocked/leaking injectors
4.Injector delay time not correct
5.Air leakage through intake
P2188
Less air quantity
or more fuel
quantity at idle –
Gasoline Mode
----
OFF
ON
ON
P2279
Intake air leakage
Crack in the
manifold, canister
purge hose
removed
OFF
ON
ON
1. Damaged inlet manifold
2. Canister purge hose removed/damaged