P1243

Y : P1243. SENSOR GROUND CIRCUITS.

Y1 : CHECK THE GROUND CIRCUIT TO THE ECT SENSOR

1. Measure the resistance between ECT sensor electrical connector EN18 pin 1 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y2

No
REPAIR the circuit between the ECT sensor electrical connector EN18 pin 1 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y2 : CHECK THE GROUND CIRCUIT TO THE EOT SENSOR

1. Measure the resistance between EOT sensor electrical connector EN25 pin 2 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y3

No
REPAIR the circuit between the EOT sensor electrical connector EN25 pin 2 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y3 : CHECK THE GROUND CIRCUIT TO THE IP SENSOR

1. Measure the resistance between IP sensor electrical connector IJ7 pin 2 (WG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y4

No
REPAIR the circuit between the IP sensor electrical connector IJ7 pin 2 (WG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y4 : CHECK THE GROUND CIRCUIT TO THE EFT SENSOR

1. Measure the resistance between EFT sensor electrical connector IJ8 pin 1 (NU) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y5

No
REPAIR the circuit between the EFT sensor electrical connector IJ8 pin 1 (NU) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y5 : CHECK THE GROUND CIRCUIT TO THE MAP SENSOR

1. Measure the resistance between MAP sensor electrical connector EN8 pin 4 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y6

No
REPAIR the circuit between the MAP sensor electrical connector EN8 pin 4 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y6 : CHECK THE GROUND CIRCUIT TO THE FTP SENSOR

NOTE: Access to the FTP sensor involves the removal of the fuel tank. To reduce the amount of work necessary, a slave harness could be used. This can be connected at the access port beneath the rear seat. Tests can then be carried out via the slave harness and sensor. If system operation is normal with the slave harness and sensor, the fault lies in the vehicle's harness or sensor.

1. Measure the resistance between FTP sensor electrical connector FT1 pin 3 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y7

No
REPAIR the circuit between the FTP Sensor electrical connector FT1 pin 3 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y7 : CHECK THE GROUND CIRCUIT TO THE APP SENSOR (Track 1)

1. Measure the resistance between APP sensor electrical connector PA1 pin 3 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y8

No
REPAIR the circuit between the APP sensor electrical connector PA1 pin 3 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y8 : CHECK THE GROUND CIRCUIT TO THE TP SENSOR

1. Measure the resistance between TP sensor electrical connector EN13 pin 1 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y9

No
REPAIR the circuit between the TP sensor electrical connector EN13 pin 1 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y9 : CHECK THE GROUND CIRCUIT TO THE APP SENSOR (Track 3)

1. Measure the resistance between APP sensor electrical connector PA1 pin 6 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
Goto Y10

No
REPAIR the circuit between the APP sensor electrical connector PA1 pin 6 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams

Y10 : CHECK THE GROUND CIRCUIT TO THE AIR CONDITIONING PRESSURE SENSOR

1. Measure the resistance between ACP sensor electrical connector JB106 pin 1 (BG) and GROUND.

Is the resistance less than 5 ohms?
Yes
No electrical fault in ground circuit. Recheck DTCs.

No
REPAIR the circuit between the ACP sensor electrical connector JB106 pin 1 (BG) and GROUND. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the PCM. For additional information, refer to wiring diagrams