490-491 / 654
ENGINE
DTC
DESCRIPTION
CAUSE
DIAGNOSTIC
LAMP (
MIL
)
DIAGNOSTIC
LAMP (
CEL
)
Gil When
Driven In CNG
PROBABLE TROUBLE AREA
P0508
Stepper motor
short to ground
Short Circuit to
Ground
ON
OFF
ON
1) Loose/ Damaged Connections.
2) Check the continuity from Stepper Motor connector pins to the ECU pins. (ECU pin 151-Stepper motor A; ECU pin 150/241- Stepper
Motor B; ECU pin 149/113-Stepper Motor C; ECU pin 152-Stepper Motor D).
3) Check for back out of pins at both Stepper Motor connector and ECU connector.
4) Check for damage of pins at both sensor connector and ECU connector.
5) Faulty ISCV.
6) Faulty ECU.
P0509
Stepper motor
short to battery
Short Circuit to
Battery
ON
OFF
ON
P0511
Stepper motor
signal error
Signal Error
ON
OFF
ON
P0532
A/C Pressure
sensor short to
Battery error
Short Circuit to
Battery
OFF
OFF
ON
1) Loose /Damaged connector.
2) A/C pressure sensor signal line Short to Battery/ Ground.
3) Check the continuity from A/C pressure sensor connector (Pin1 to ECU pin 137; Pin2 to ECU pin 110 & Pin3 to ECU pin 104).
4) Check for back out of pins at both A/C pressure sensor connector and ECU connector.
5) Faulty sensor.
6) Check refrigerant level.
7) Faulty ECU.
P0533
A/C Pressure
sensor short to
ground or signal
error
Short Circuit to
Ground/No signal
detected
OFF
OFF
ON