SAAB WIS ONLINE

Car fails to start

Read the instructions below then start the fault diagnostic procedure.

Symptom: Car fails to start.

Car fails to start



Fault symptoms

Car fails to start.

Conditions

The following conditions apply for the current fault symptom:


• No diagnostic trouble codes in the car with the current symptom description.

• Petrol in the tank.

• Starter motor in order.


Diagnostic help

Most functions that can stop the engine from starting are monitored by self-diagnosis and therefore generate diagnostic trouble codes if they malfunction. This fault diagnosis therefore applies to faults that are not monitored but can prevent the engine from starting.

The operation and pressure delivered by the fuel pump is checked first. Then, the crankshaft position sensor, ignition discharge module and spark plugs are checked.

Functions in the diagnostic tool related to the fault:


• Activate fuel pump relay.

• Activating ignition triggers.


See also the description of activations, , for more information.

Checking the wiring

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.