AA3 - Check For VREF At Throttle Position Sensor
- Key "OFF".
- Disconnect Throttle Position (TP) sensor.
- Key "ON", engine "OFF".
Throttle Position Harness Connector:
- Measure voltage between VREF circuit and SIG RTN circuit at the TP sensor vehicle harness connector.
- Is voltage between 4.0 and 6.0 volts?
Yes -- Reconnect TP sensor. Go to AA4. AA4 - Check For Spark At Plugs
No -- Go to pinpoint test step C1. C1 - Check Vehicle Battery Power Circuit