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Home >> Mazda >> 1994 >> Navajo DX, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Ignition System >> Pinpoint Tests >> Pinpoint Test C (Lack Of Power Or Poor Fuel Economy Code 213)
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Pinpoint Test C (Lack Of Power Or Poor Fuel Economy Code 213)

  1. With ignition off, install ICM diagnostic cable to BOB and ICM module. DO NOT connect VR sensor tee or coil tee. Use ICM 6 overlay. Connect negative and positive leads of ICM diagnostic cable to battery. Set ICM diagnostic cable box switch to 4/6 CYLINDER position. Connect timing light (must be ICM compatible). Start engine, and warm it to normal operating temperature. Push and hold down ICM diagnostic cable SAW detector button. If timing is 8-12 degrees BTDC, go to next step. If timing is not 8-12 degrees BTDC, go to step 8).
  2. Release ICM diagnostic cable SAW detector button. Go to next step if timing is not 15 degrees BTDC. If timing is more than 15 degrees BTDC, ICM 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 ICM 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 ICM module is okay and no spark advance is present. Replace ICM module. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in appropriate G - TESTS W/ CODES articles in the ENGINE PERFORMANCE section below.
  4. With ignition off and SAW circuit disconnected, set DVOM on 20-volt AC scale. Push and hold down SAW detector button at ICM diagnostic cable connector to BOB. Start engine, and measure voltage between SAW DETECTOR (21) of ICM 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 ICM module. Replace ICM module. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in appropriate G - TESTS W/ CODES articles in the ENGINE PERFORMANCE section below.
  5. With ignition off and ICM module and PCM disconnected, disconnect ICM module from ICM module tee, leaving ICM diagnostic cable connected to vehicle harness connector. Set DVOM on 20-k/ohm scale. Disconnect ICM 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 G - TESTS W/ CODES articles in the ENGINE PERFORMANCE section below.
  6. With ignition off and ICM module and PCM 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 appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section below.
  7. With ignition off and ICM module and PCM disconnected, set DVOM on 200-ohm scale. Connect PCM Breakout Box (BOB) to PCM harness connector. Measure resistance between SAW E (45) at BOB and terminal No. 36 at PCM 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 appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section. 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 appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section below.
  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 appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section below. If VR sensor or trigger wheel is not loose, misaligned or damaged, ICM module has incorrect output. Remove test equipment, and reconnect all components. Clear continuous memory codes, and rerun QUICK TEST. See QUICK TEST in appropriate G - TESTS W/ CODES articles in the ENGINE PERFORMANCE section below.
CAUTION: Unless directed otherwise, DO NOT connect PCM to PCM Breakout Box (BOB) when performing ICM diagnostics.
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