SAAB WIS ONLINE

PSG16 / U0121 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)

  U0121 00


TCS/ESP Missing on Bus

Fault symptom

Fault indicator lamp (for further information see WIS Fault diagnosis, general)

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.
The following diagnostic trouble codes may not be generated:
P0602 46
U0002
U0073

Fault criteria:

No communication with TCS/ESP for 1 s.

OK report:

Fault criteria NOT fulfilled.

Checking the wiring harness

Faults in the control module female connector can be the cause of the DTC. Check the connector with respect to oxidation, depressed pins and pin clamping force.
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:


Functions in the diagnostic tool related to the fault:

Test value:
Bus Off Counter, P-Bus
(See also description of readings/activations in diagnostic tool)