AC2 - Check For VREF At Throttle Position Sensor

- Key "OFF".

- Disconnect Throttle Position (TP) sensor.

- Key "ON", engine "OFF".

Throttle Position Sensor Harness Connector:

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

- Is voltage between 4.0 and 6.0 volts?

Yes -- Reconnect TP sensor. Go to AC3. AC3 - Check For Spark At Plugs

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