Engine speed
Output signal to main instrument display panel
Symptom of fault
Tachometer does not work.
Diagnostic procedure
1. Check the wiring
|
-
|
Check the wiring between pin 58 of
the Trionic control module and pin 6 of the main instrument display panel for continuity.
|
|
-
|
Check the lead for open circuit and
shorting.
|
Is the lead OK?
Continue with point 2.
Rectify the fault.
2. Check the output signal
|
-
|
Plug in the Trionic control module.
|
|
-
|
Unplug the main instrument display
panel's connector.
|
|
-
|
Start the engine and run it at idling
speed.
|
|
-
|
Take a frequency reading across
pin 6 of the connector and a good ground.
|
At idling speed, about 900 rpm, the frequency should be about 30 Hz.
Are the readings OK?
Continue fault diagnosis as described in Service Manual 3:5 "Electrical
system, main instrument display panel".
Proceed to
.
