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02 S4 Fogarty Monster, Suddenly No Starter Motor Functionality

1.9K views 9 replies 3 participants last post by  foggy200  
#1 ·
28500 miles

Turning key on, initailization looks normal
Gauges Cycle Up/Down
Fuel System Pressurizes
Looks like All Systems Go, But No Starter Motor Engagement and Engine Turnover.

Any help or ideas?

All fuses buzz out as NOT OPENED.

I tried my spare BLACK key and the RED key just to see if it might be an
immobilizer issue, also with no success.

Cheers,

-Foggy200
 
#3 ·
More Info

  • All fuses are good.
  • Removed Starter Wire and went direct to battery:
    • Engine turns but no start (I suspect no spark, since it always starts easily) .
  • With Key Switched to ON Position:
    • Get fuel pump pressurization noises as expected with key to ON position.
    • Get Servo/Relay Noise from Instrument Cluster with key to ON position.
    • Get Gauge Pointers Sweeping the Dials with key to ON position.
  • Tapped on Relays in hopes of dislodging a stuck connection, no change.
Everything appears to happen normally when key is switched to the ON Position, except NO Starter Motor action/noise when the Starter Button is Depressed.

More suggested troubleshooting welcome.
 
#8 ·
Motor

If you put it in gear on a stand can you turn the motor with the rear tire?

If not I would be looking at the starter locked up.

Test for voltage going to the starter when you hit the start button.

Look for the fried wire etc from the alternator to the wiring harness and back to the starter.