1289 / 1428
ENGINE
DTC
DESCRIPTION
CAUSE
DIAGNOSTIC
LAMP (
MIL
)
DIAGNOSTIC
LAMP (
CEL
)
Gil When
Driven In CNG
PROBABLE TROUBLE AREA
P0627
Fuel Pump
Control signal
error
Signal Error
OFF
OFF
ON
1) Loose/ Damaged Connections.
2) Check the continuity from Fuel pump Relay connector pin to the ECU pin142.
3) Check for back out of pins at ECU connector.
4) Faulty Fuel Pump.
5) Faulty ECU
P0628
Fuel Pump short
to ground
Short Circuit to
Ground
OFF
OFF
ON
P0629
Fuel Pump short
to battery
Short Circuit to
Battery
OFF
OFF
ON
P0642
Sensor 1 (TPS)
Reference voltage
supply short to
ground
Short Circuit to
Ground
ON
OFF
ON
1) Loose/ Damaged Connections.
2) Faulty Sensor.
3) Faulty ECU.
P0643
Sensor 1 (TPS)
Reference voltage
supply short to
battery
Short Circuit to
Battery
ON
OFF
ON
P0645
A/C Clutch Relay
signal error
Signal Error
OFF
OFF
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 AC clutch Relay connector pin to the ECU pin 131.
5) Check if 12 Volts is coming to ECU pin 28 when A/C request is switched ON.
6) Check for back out of pins at ECU connector.
7) Faulty A/C Clutch Relay.
8) Faulty ECU
P0646
A/C Clutch Relay
short to ground
Short Circuit to
Ground
OFF
OFF
ON
P0647
A/C Clutch Relay
short to battery
Short Circuit to
Battery
OFF
OFF
ON