Tachometer
Condition:Tachometer (RPM):
- No diagnostic trouble codes (DTCs) stored for the engine speed (RPM) signal in the fuel/ignition system or combined instrument panel.
Possible Source:
- Defective tachometer.
- The combined instrument panel is programmed for a different scale than the tachometer.
Start fault-tracing with step 1, "Checking Tachometer", below.
1) Checking Tachometer:
- Connect Volvo Scan Tool (ST) to data link connector (DLC).
Engine Running:
- Start engine
- Go into scrolling values.
- Read off engine speed (RPM) at different engine speeds and compare with tachometer.
- Do engine speed (RPM) and tachometer agree?
Yes: No fault found.
No: Proceed to step 2, below.
2) Checking Programmed Engine Speed (RPM) for Tachometer:
- Read off and note maximum tachometer engine speed (RPM).
Ignition On:
- Ignition on.
- Volvo Scan Tool (ST) connected to data link connector (DLC).
- Go into "read combi" under "program combi".
VDO W/Turbo:
- Read off maximum tachometer engine speed (RPM).
- Does programmed engine speed (RPM) agree with maximum engine speed (RPM)?
Yes: Go to step 3, below.
No: Go to step 4, below.
3) Replacing Component:
- Try a new instrument panel.
- Then continue with step 5, below.
4) Programming Combined Instrument Panel:
- Program maximum tachometer engine speed (RPM) in the combined instrument panel. Diagnostic Functions
- Then continue with step 5, below.
5) Verification:
Note: After carrying out the repair check that the fault has been remedied.
- Ignition off.
Connect Connector:
- Reconnect connectors, reinstall components.
Engine Running:
- Start engine
- Go into scrolling values.
- Read off engine speed (RPM) at different engine speeds and compare with tachometer.
- Do engine speed (RPM) and tachometer agree?
Yes: Fault is corrected
No: The verification result shows that the fault persists. Do you want to quit fault-tracing?
Yes: Fault not corrected
No: Start over at step 1, above.