1997 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE

EGR Position Sensor Testing

NOTE: EGR position sensor may also be referred to as EGR valve position sensor.
  1. Disconnect electrical connector from EGR position sensor. EGR position sensor is located on top of EGR valve. See Fig 1.
  2. Using ohmmeter, check resistance between terminals E2 and VC on EGR position sensor. See Fig 1. Resistance should be 1500-4300 ohms. If resistance is within specification, reinstall electrical connector on EGR position sensor and go to next step. If resistance is not within specification, replace EGR position sensor.
  3. To test EGR position sensor output voltage, disconnect vacuum hose from EGR valve. Remove glove box for access to Engine Control Module (ECM).
  4. Turn ignition on. Using voltmeter, check voltage between terminals No. 1 and 22 on ECM. Perform STEP 1. See Fig 2. See ECM TERMINAL APPLICATION  table. Voltage should be 4.5-5.5 volts. Remove voltmeter.
  5. Connect voltmeter between terminals No. 15 and 22 on ECM. Perform STEP 2. See Fig 2. See ECM TERMINAL APPLICATION  table.
  6. Using vacuum pump, apply 5.1 in. Hg of vacuum to EGR valve and note voltage. Voltage should be 3.2-5.1 volts with vacuum applied on EGR valve. Release vacuum from EGR valve and note voltage. Voltage should be .4-1.6 volts with vacuum released from EGR valve. Replace EGR position sensor if voltage is not within specification. Remove vacuum pump and reinstall vacuum hose on EGR valve.
ECM TERMINAL APPLICATION

Application & Terminal No. Wire Color
1 Blue/Red
15 Black/Orange
22 Brown
Fig 1: Locating EGR Position Sensor & Checking EGR Position Sensor Resistance
G97F06491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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