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Home/Mazda/MX-5/Mazda MX-5 NC (2005-2008)/Repair manual/Testing & Diagnostics/Engine Control System: Removal & Installation
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Engine Control System: Removal & Installation Mazda MX-5 NC

Testing & Diagnostics 3 illustrations ~550 words

Removal

  1. Remove the battery and battery tray. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-244448-S25513985422006092400000) .)
  2. Remove the air cleaner. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF]»(ref-244455-S24513161252006092400000) .)
  3. Remove the drive belt. (See «DRIVE BELT REPLACEMENT [LF]»(ref-244453-S32071317942006092400000) .)
  4. Remove the under cover. (See «TRANSVERSE MEMBER REMOVAL/INSTALLATION»(ref-244475-S19815374922006092400000) .)
  5. Disconnect the CKP sensor connector.
  6. Remove the installation bolts to remove the CKP sensor.

Installation

CAUTIONWhen foreign material, such as an iron chips, gets on the CKP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect engine control. Be sure there is no foreign material on the CKP sensor when replacing.

Scheme 61

Scheme 61
Scheme 61

Scheme 62

Scheme 62
Scheme 62

Scheme 63

Scheme 63
Scheme 63
  1. Perform the following procedure so that piston No.1 is at the top dead center. Move the ATF hose slightly out of the way. (AT) Remove the cylinder block lower blind plug and install the SST. Turn the crankshaft pulley to the clockwise until it stops.
  2. Using a straight edge, draw a straight line directly in the center of the 5th tooth of the crankshaft pulley pulse wheel (counting counterclockwise from the empty space). CAUTION: If the line is not accurately drawn, ignition timing, fuel injection and other engine control systems will be adversely effected. Draw the straight line carefully using a straight edge.
  3. Align the center line of the CKP sensor and the line drawn in Step 2 , then install the CKP sensor.
  4. Install the CKP sensor fitting bolts. Tightening torque 5.5-7.5 N.m {56-76 kgf.cm, 49-66 in.lbf}
  5. Remove the SST then install the cylinder block lower blind plug. Tightening torque 18-22 N.m {1.9-2.2 kgf.m, 14-16 ft.lbf}
  6. Install in the reverse order of removal.

CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [LF]

  1. Remove the battery cover.
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-244448-S25513985422006092400000) .) CAUTION: When replacing the camshaft position sensor, make sure there are no metal shavings adhering as they can cause the sensor output signal to malfunction from fluctuation in magnetic flux resulting in a deterioration in engine control. Cover a removed CMP sensor in plastic to protect it from foreign material adhering to it.
  3. Disconnect the CMP sensor connector.
  4. Remove the CMP sensor installation bolt.
  5. Remove the CMP sensor from the cylinder head cover.
  6. Install in the reverse order of removal. CMP sensor tightening torque 5.5-7.5 N.m {56-76 kgf.cm, 49-66 in.lbf}

MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [LF]

  1. Remove the battery cover.
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-244448-S25513985422006092400000) .)
  3. Disconnect MAF/IAT sensor connector.
  4. Remove the MAF/IAT sensor.
  5. Install in the reverse order of removal. MAF/IAT sensor tightening torque 0.55-0.82 N.m {5.7-8.3 kgf.cm, 4.9-7.2 in.lbf}

REAR HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [LF]

  1. Remove the battery cover.
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-244448-S25513985422006092400000) .)
  3. Install the SST to the rear HO2S.
  4. Remove the rear HO2S.
  5. Install in the reverse order of removal. Rear HO2S tightening torque 29-49 N.m {3.0-4.9 kg.fm, 22-35 ft.lbf}

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REMOVAL/INSTALLATION [LF]

  1. Remove the battery cover.
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-244448-S25513985422006092400000) .)
  3. Remove the dynamic chamber. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF]»(ref-244455-S24513161252006092400000) .)
  4. Remove the MAP sensor.
  5. Install in the reverse order of removal. MAP sensor tightening torque 2.7-3.7 N.m {28-37 kgf.cm, 24-32 in.lbf}

KNOCK SENSOR (KS) REMOVAL/INSTALLATION [LF]

  1. Remove the battery cover.
  2. Remove the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-244448-S25513985422006092400000) .)
  3. Remove the dynamic chamber. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF]»(ref-244455-S24513161252006092400000) .)
  4. Disconnect the KS connector.
  5. Remove the KS installation bolt, then remove the KS.
  6. Install in the reverse order of removal. KS tightening torque 16-24 N.m {1.7-2.4 kgf.m, 12-17 ft.lbf}

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