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Home >> Mazda >> 1997 >> 626 DX L4-2.0L DOHC >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Exhaust Gas Recirculation >> EGR Valve Position Sensor >> Testing and Inspection >> With Automatic Transaxle
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With Automatic Transaxle

Using the Special Service Tool (104 Pin Breakout Box)




1. Connect the SST to the Powertrain Control Module (PCM) as shown and connect a vacuum pump to the EGR valve.
2. Turn the ignition switch to ON.




3. Measure the voltage at the terminals as shown in the table.
4. If not correct at 65 terminal, check the wiring harness and 90 terminal of the PCM.

Using the SST (NGS)




1. Connect the SSTs New Generation Star (NGS) tester to the data link connector 2.







2. Select the "PID/DATA MONITOR AND RECORD" function of NGS and connect a vacuum pump.
3. Select "EGR VP" on the NGS. The NGS measures and shown in the specification.




4. If the EGR valve position signal voltage is not correct, check the wiring harness and 90 terminal of the PCM.

Inspection of resistance
1. Disconnect the EGR valve position sensor connector, and connect an ohmmeter.
2. Disconnect the vacuum hose from the EGR valve, and connect a vacuum pump.




3. Measure the resistance between the terminals as shown while vacuum is applied.
4. If not as specified, replace the EGR valve.

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