P1194
PPowertrainPump Speed Signal Fault
What does this code mean?
Severity : MediumP1194 reports a pump speed signal fault. On many vehicles it relates to the speed sensor of the injection pump or fuel pump, which the control module needs to meter fuel. This is a manufacturer-specific code: the exact meaning depends on the manufacturer.
Symptoms
- Check engine light on.
- Hard start or no start.
- Loss of power or limp mode.
- Possible engine stalling.
Possible causes
- Faulty pump speed sensor.
- Damaged wiring or connector.
- Failing pump, depending on the system involved.
- Electrical interference or poor ground.
- Faulty control module, less often.
Diagnosis and repair
- Check the manufacturer documentation to identify the pump and sensor involved.
- Inspect the sensor wiring and connector.
- Read pump speed in live data and check it tracks engine speed.
- Test the sensor with a multimeter or oscilloscope, then replace the faulty part.
- Clear the code and road test.
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Code
P1194
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012