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ENGINE
DTC
DESCRIPTION
CAUSE
DIAGNOSTIC
LAMP (
MIL
)
DIAGNOSTIC
LAMP (
CEL
)
Gil When
Driven In CNG
PROBABLE TROUBLE AREA
P0420
Catalyst Signal
Compare Failure
Catalyst Aging
/Oscillating Rear
Sensor Voltage
ON
OFF
ON
1) Check Catalyst
2) Check connection of Lambda sensor( Front and Rear)
P0444
Canister Purge
Valve signal error Signal Error
ON
OFF
ON
1) Loose/ Damaged Connections or Intermittent fault.
2) Actuator supply line Short circuit to Battery/ Ground.
3) Actuator control line Short circuit to Battery/ Ground.
4) Check the continuity from Canister Purge connector pin 1 to ECU pin 235 & Canister Purge connector pin 2 to ECU pin 156.
5) Check for back out of pins at both Sensor connector and ECU connector.
6) Canister purge valve stuck/closed.
7) Faulty EPCV.
8) Faulty ECU
P0445
Canister Purge
Valve control
circuit short circuit
Short circuit
ON
OFF
ON
P0480
Radiator Fan relay
control circuit
signal error
Signal Error
OFF
ON
Blinking
ON
1) Loose/ Damaged Connections.
2) Relay supply line Short circuit to Battery/ Ground.
3) Relay Control line Short circuit to Battery/ Ground.
4) Check the continuity from Radiator Fan Relay connector pin to the ECU pin 141 / Check the continuity from Condenser Fan Relay
connector pin to the ECU pin 140.
5) Check for back out of pins at ECU connector.
6) Faulty/Damaged Relay
P0482
Condenser Fan
Relay Control
Circuit signal error
Signal Error
OFF
OFF
ON
P0501
Vehicle Speed
Sensor signal
error
Signal Error
OFF
ON
ON
1) Loose/ Damaged Connections.
2) Sensor supply line Short circuit to Battery/ Ground.
3) Sensor Signal line Short circuit to Battery/ Ground.
4) Check the continuity from instrument cluster vehicle speed pin to the ECU pin no 232.
5) Check for back out of pins at ECU connector.
6) INSTRUMENT CLUSTER
7) Faulty VSS.
8) Faulty ECU.
P0506
Low intake air flow Stuck/blocked
stepper motor.
OFF
ON
ON
1. Blocked/Stuck stepper motor
2.Intake air leakage/ blockage of air path
3. Check for connections to intake manifold like canister hose, break booster hose, Pressure sensor mounting and mounting bolts of intake
manifold to engine.
P0507
High intake air
flow
Intake air
leakage/stuck
stepper motor
OFF
ON
ON