DA21 - Check VREF Circuit Voltage At Throttle Position Sensor

- Refer to schematic in Pinpoint Test DH.

- Key "OFF".

- Suspect temperature sensor disconnected.

- Disconnect Throttle Position (TP) sensor.

- Key "ON", engine "OFF".

- Measure voltage between VREF circuit and SIG RTN circuit at the TP sensor vehicle harness connector.

- Is voltage between 4.0 volts and 6.0 volts?

Yes -- Reconnect TP sensor, go to DA22. DA22 - Check Temperature Sensor Circuit For Short to Ground

No -- Go to pinpoint test step C1. C1 - Check Vehicle Battery Power Circuit