SAAB WIS ONLINE

P0646

Read the instructions below then start the fault diagnostic procedure.

Symptom: A/C compressor runs continuously.

P0646


A/C Relay Circuit, Short to Ground

Fault symptoms


• A/C compressor runs continuously.


On-Board Diagnostics

Type of diagnosis:


- Continuous.


Enable criteria:


- Engine running.

- Output NOT activated.


Fault criteria:


- Output shorted to ground for more than 0.6 s.


OK report:


- Fault criteria NOT fulfilled for 0.6 s.


Check the wiring

A fault in the control module's female connector can generate a DTC. Check the contact for oxidation, dislodge pins and pin clamping force.

Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this. Check switches, connectors and crimp connections for oxidation, dislodged pins and pin clamping force.

Diagnostic help

Diagnostic tool functions related to this fault are:


• Activate:

• AC Relay


For more information, see also:

- "Read Values" menu for a description of read values.

- "Activate" menu for a description of applications.