1062 / 1904
ELECTRICALS
131
Sr.
No.
Displayed
DTC Code
DTC Description
Fault
cause
Probable trouble Area
77 P0138 - 12
Downstream oxygen
sensor circuit short to
battery
Circuit short
to battery
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 the continuity from sensor connector
pins to the ECU pins.
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 downstream HO2S2 sensor.
8) Faulty ECU.
78 P0137 - 11
Downstream oxygen
sensor short circuit to
ground
Circuit short
to ground
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 the continuity from sensor connector
pins to the ECU pins.
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 downstream HO2S2 sensor.
8) Faulty ECU.
79 P0140 - 64
Downstream oxygen
sensor circuit signal
non plausible
Signal
plausibility
failure
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 the continuity from sensor connector
pins to the ECU pins.
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 downstream HO2S2 sensor.
8) Faulty ECU.