Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mazda >> 1992 >> 323 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - EFI >> Ignition System >> Pinpoint Tests (NAVAJO) >> Pinpoint Test C (Lack Of Power Or Poor Fuel Economy Code 213)

Pinpoint Test C (Lack Of Power Or Poor Fuel Economy Code 213)

  1. With ignition off, install EDIS diagnostic cable to BOB and EDIS module. DO NOT connect VR sensor tee or coil tee. Use EDIS "6" overlay. Connect negative and positive leads of EDIS diagnostic cable to battery. Set EDIS diagnostic cable box switch to 4/6 CYLINDER position. Connect timing light (must be EDIS compatible). Start engine, and warm it to normal operating temperature. Push and hold down EDIS diagnostic cable SAW detector button. If timing is 8-12 degrees Before Top Dead Center (BTDC), go to next step. If timing is not 8-12 degrees Before Top Dead Center (BTDC), go to step 8).
  2. Release EDIS diagnostic cable SAW detector button. Go to next step if timing is not 15 degrees BTDC. If timing is more than 15 degrees BTDC, EDIS is okay. Check for other causes of driveability symptoms.
  3. With ignition off, set DVOM on 20-volt AC scale. Start engine and measure voltage between SAW DETECTOR (21) of EDIS diagnostic cable and BAT- (7) at BOB. If AC voltage is 5 volts or more, go to next step. If AC voltage is less than 5 volts, SAW input to EDIS module is okay and no spark advance is present. Replace EDIS module. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
  4. With ignition off and SAW circuit disconnected, set DVOM on 20-volt AC scale. Push and hold down SAW detector button at EDIS diagnostic cable connector to BOB. Start engine, and measure voltage between SAW DETECTOR (21) of EDIS diagnostic cable and BAT- (7) at BOB. If AC voltage is less than 5 volts, go to next step. If AC voltage is 5 volts or more, SAW is shorted in EDIS module. Replace EDIS module. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
  5. With ignition off and EDIS module and ECA disconnected, disconnect EDIS module from EDIS module tee, leaving EDIS diagnostic cable connected to vehicle harness connector. Set DVOM on 20-k/ohm scale. Disconnect EDIS diagnostic cable positive lead to battery. Measure resistance between SAW E (45) and BAT- (7) at BOB. If resistance is 10 k/ohms or more, go to next step. If resistance is less than 10 k/ohms, SAW is shorted low. Check connections and/or repair open circuit or replace harness. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
  6. With ignition off and EDIS module and ECA disconnected, set DVOM on 20-volt DC scale. With Key On, Engine Off (KOEO), measure voltage between SAW E (45) and BAT- (7) at BOB. If DC voltage is less than .5 volt, go to next step. If DC voltage is .5 volt or more, SAW is shorted high. Check connections and/or repair open circuit or replace harness. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
  7. With ignition off and EDIS module and ECA disconnected, set DVOM on 200-ohm scale. Connect ECA Breakout Box (BOB) to ECA harness connector. Measure resistance between SAW E (45) at BOB and terminal No. 36 at ECA BOB. If resistance is less than 5 ohms, SAW is open. Check connections and/or repair open circuit or replace harness. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article. If resistance is 5 ohms or more, SAW is not being transmitted by ECU. Replace ECU. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
  8. If VR sensor or trigger wheel is loose, misaligned or damaged, repair or replace as necessary. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article. If VR sensor or trigger wheel is not loose, misaligned or damaged, EDIS module has incorrect output. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in TESTS W/CODES - NAVAJO article.
CAUTION: Unless directed otherwise, DO NOT connect ECA to ECA Breakout Box (BOB) when performing EDIS diagnostics.
scientia non olet · About Mike's Workshop Manuals