P0699

P0699-SENSOR REFERENCE VOLTAGE 3 CIRCUIT HIGH

For complete wiring diagrams refer to Diagrams/Electrical.


Theory of Operation

The throttle pedal produces two voltage signals proportional to the pedal movement. The voltages are created by electronic circuitry within the pedal assembly. The primary signal varies between 0 and 5 volts and the secondary signal varies between 0 and 2.5 volts. The Engine Control Module uses the two signals to validate throttle pedal position to control engine fueling. The ECM illuminates the MIL lamp immediately after the diagnostic runs and fails. The ETC lamp will also flash. During this time the customer will be in a limp home mode. The ECM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.

- When Monitored:

While engine is running.

- Set Condition:

High voltage detected at the APPS supply circuit.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.


1. (F855) 5-VOLT SUPPLY OPEN





Turn the ignition off.

Disconnect the APPS harness connector.


NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.

Measure the voltage between the (F855) APPS #1 5-volt supply circuit at the sensor connector and battery negative.

Is the voltage between 4.5 and 5.5 volts?

Yes

- Replace the APPS.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 2

2. (F855) 5-VOLT SUPPLY SHORT TO VOLTAGE





Turn the ignition off.

Disconnect the ECM harness connector(s).


NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.

Measure the voltage between the (F855) APPS #1 5-volt supply circuit in the sensor harness connector and battery negative.

Is the voltage less than 1 volt?

Yes

- Go To 3

No

- Repair or replace the wiring harness.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

3. ECM





Turn the ignition off.

Reconnect the ECM harness connector(s).

Ignition on, engine not running.

Measure the voltage between the (F855) APPS #1 5-volt supply circuit at the sensor harness connector and battery negative.

Is the voltage greater than 6 volts?

Yes

- Replace and program the ECM.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition