Mazda MX-3 silhouetteMX-3

NEUTRAL SWITCH / EGR VALVE POSITION SENSOR

F2-158prose procedure

Neutral switch applies to A/T transaxle.

CONTROL SYSTEM

NEUTRAL SWITCH

Inspection

Neutral Switch Inspection

  1. 1
    Disconnect the neutral switch connector shown in the figure.
    Neutral switch on the transaxle with an ohmmeter connected to the switch connector. The drive shaft is labeled for reference.
  2. 2
    Connect an ohmmeter to the switch.
  3. 3
    Check continuity of the switch.
  4. 4
    If not as specified, replace the neutral switch.

Neutral Switch Continuity

Neutral
ContinuityYes
Other ranges
ContinuityNo

Replacement

Neutral Switch Replacement

  1. 1
    Disconnect the neutral switch connector.
  2. 2
    Remove the bracket.
    Neutral switch location on the transaxle with the bracket, illustrating the replacement procedure. Drive shaft labeled.
  3. 3
    Remove the neutral switch.
  4. 4
    Install in the reverse order of removal.
neutral switch
20 - 29N·m

EGR VALVE POSITION SENSOR

Inspection of Output Voltage

EGR Valve Position Sensor Inspection of Output Voltage

  1. 1
    Disconnect the ECM connector.
  2. 2
    Connect the SSTs (Engine Signal Monitor and Adapter) to the ECM as shown and connect a vacuum pump.
    SST setup for EGR valve position sensor output voltage measurement: Engine Signal Monitor and Adapter connected to the ECM, with tool boxes labeled by part number. ECM shown at lower left.
  3. 3
    Turn the ignition switch to ON.
  4. 4
    Measure voltage at the terminals as shown in the table.
  5. 5
    If not correct at terminals A and B, check the wiring harness and terminals 2I and 3D of the ECM.
  6. 6
    If not correct at terminal C, measure the sensor resistance, then the wiring harness and terminal 2F of the ECM.

EGR Valve Position Sensor Output Voltage

C
ECM2I
Vacuum 0 mmHg {0 inHg}4.5-5.5V
Vacuum 150 mmHg {5.9 inHg}4.5-5.5V
B
ECM3D
Vacuum 0 mmHg {0 inHg}Below 1.5V
Vacuum 150 mmHg {5.9 inHg}Below 1.5V
A
ECM2J
Vacuum 0 mmHg {0 inHg}Approx. 0.7V
Vacuum 150 mmHg {5.9 inHg}Approx. 4.7V

Inspection of Resistance

EGR Valve Position Sensor Inspection of Resistance

  1. 1
    Disconnect the EGR valve position sensor connector, and connect an ohmmeter.
    EGR valve position sensor connector (terminals C, B, A) with a vacuum pump/gauge connected to the EGR valve for the resistance inspection.
  2. 2
    Disconnect the vacuum hose from the EGR valve, and connect a vacuum pump.
  3. 3
    Measure the resistance between terminals as shown in the table.

EGR Valve Position Sensor Resistance

C-B
ECM2I-3D
Vacuum 0 mmHg {0 inHg}4.6 KΩ
Vacuum 150 mmHg {5.9 inHg}4.6 KΩ
A-B
ECM2J-3D
Vacuum 0 mmHg {0 inHg}Approx. 2.3 KΩ
Vacuum 150 mmHg {5.9 inHg}Approx. 5.8 KΩ
A-C
ECM2J-2I
Vacuum 0 mmHg {0 inHg}Approx. 5.3 KΩ
Vacuum 150 mmHg {5.9 inHg}Approx. 1.2 KΩ
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