Test EVP - EGR Valve Position Sensor

Fig 1: Identifying EVP Sensor Circuit (2.5L)

Fig 2: Identifying EVP Connector Terminals (2.5L)

NOTE: Enter this test only when a Code 16 is displayed during self-test procedures (KOEO or KOER) or when directed here from another circuit test. This test is intended to diagnose EVP circuit only.

CIRCUIT PIN IDENTIFICATION

Circuit	Breakout Box Pin No.	PCM Pin	Wire Color
EVP	27	2J	Red/Black
GND	46	3D	Black/Blue
VREF	26	2I	Purple

1) Check System Integrity Visually check all wiring, connectors and components for evidence of damage, shorting or looseness. If a fault is found, repair as necessary. If no fault is found, go to next step.

2) Check EVP Signal To PCM Turn ignition off. Install breakout box. Connect PCM to breakout box. Install vacuum pump to EGR vacuum port. Turn ignition on. Measure voltage between ground and EVP test pin at breakout box. Turn ignition on. Slowly apply vacuum to EGR valve. Compare voltmeter readings to specifications shown in VOLTAGE SPECIFICATIONS (EVP SENSOR) table. If voltage is as specified, EVP circuit is okay. If no other problem or code is found, replace PCM. If voltage is not as specified, go to next step.

VOLTAGE SPECIFICATIONS

Vacuum (In. Hg)

⁽¹⁾ Volts

0.8

5.0

⁽¹⁾	Voltage value is approximate.

3) Check VREF At EVP Sensor Turn ignition off. Disconnect EVP sensor connector. Turn ignition on. Measure voltage at VREF terminal at EVP sensor connector. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, go to TEST VREF.

4) Check Ground At EVP Sensor Ensure ignition is off and EVP sensor is disconnected. Measure resistance between ground and GND terminal at EVP sensor connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair EVP sensor ground wire.

5) Check For Open EVP Wire Ensure ignition is off and EVP sensor is disconnected. With breakout box installed, disconnect PCM connectors. Measure resistance between EVP test pin at breakout box and EVP terminal at EVP sensor connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open EVP wire.

6) Check For Short In EVP Wire Ensure ignition is off and EVP sensor is disconnected. With breakout box installed and PCM disconnected, measure resistance between ground and EVP test pin at breakout box. If resistance is more than 10,000 ohms, replace EVP sensor. If resistance is 10,000 ohms or less, repair short to ground in EVP wire.