Test Procedure

DT1 CHECK FOR DTCS

Is DTC P0471, P0472 or P0473 present?

Yes	No
GO to DT2.	RETURN to SYMPTOM CHARTS for further direction.

DT2 CHECK FOR VOLTAGE AT THE SENSOR

Measure the voltage between:

(+) EP Sensor Connector, Harness Side	(-) EP Sensor Connector, Harness Side
VREF - Pin 1	SIGRTN - Pin 2

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to DT3.	GO to PINPOINT TEST C .

DT3 CHECK FOR AN OPEN

Measure the resistance between:

(+) EP Sensor Connector, Harness Side	(-) PCM Connector, Harness Side
EP - Pin 3	EP

Is the resistance less than 5 ohms?

Yes	No
GO to DT4.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

DT4 CHECK FOR A SHORT BETWEEN CIRCUITS

Measure the resistance between:

(+) EP Sensor Connector, Harness Side	(-)
EP - Pin 3	Ground

Measure the resistance between:

(+) EP Sensor Connector, Harness Side	(-) EP Sensor Connector, Harness Side
EP - Pin 3	VREF - Pin 1
EP - Pin 3	SIGRTN - Pin 2

Are the resistances greater than 10K ohms?

Yes	No
GO to DT5.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

DT5 CHECK FOR A SHORT TO VOLTAGE

Measure the voltage between:

(+) EP Sensor Connector, Harness Side	(-)
EP - Pin 3	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to DT6.

DT6 INTERMITTENT CHECK

EP Sensor connector connected.
PCM connector connected.
Ignition ON, engine OFF.
Access the PCM and monitor the EBP_V (VOLT) PID.
While observing the PID, carry out the following:
- Wiggle the harness connector to simulate road shock.
- Wiggle the EP sensor connector.
- Look for sudden changes in the voltage when the harness and connector are wiggled or when the EP sensor is tapped.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	Check the EP sensor and tube for restrictions. REPAIR as necessary. If no concern is present, INSTALL a new EP sensor. REFER to the Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test.