PCM did not detect any spark reference pulses within 240 fuel control reference pulses (80 crank revolutions) while engine was running below 1200 RPM. System High Voltage If the voltage is above 17.1 volts for more than 2 seconds, the Service Engine Soon light will illuminate. See above, then check wiring connections at the ECMĬharging system voltage was either below 9 volts or above 17 volts for 10 seconds. Replace the Coolant temperature sensor.Ĭoolant Sensor Circuit (low temperature) Coolant temperature sensor signal indicates a temperature colder than -36° F for at least 4 seconds after the engine had been running for 2 seconds. Check all wiring and connectors associated with the coolant temperature sensor. The engine had been running for at least 40 seconds with an engine temperature above 110° F.Ĭoolant temperature sensor signal indicates a temperature of over 284° F for 4 seconds after the engine had been running for at least 10 secondsCoolant Sensor Circuit (high temperature) If the engine is experiencing overheating problems, have those fixed before continuing. Oxygen sensor voltage stays between 0.35 and 0.55 volts for 30 seconds when the TPS signal was above 0.55 volts. Below is a list of diagnostic codes to tell you what the codes mean.ĭiagnostic: This Code will flash whenever the diagnostic terminal is grounded with the ignition switch turned on and the engine is not running. ![]() So any flash sequence you get after the initial 12 (flash once, pause, flash twice) you need write those down. Its the flash sequences after that that will give you the code if any are stored.įor instance if it flashes twice, then pauses, then flashes four times, thats code 24. That flash sequence indicates 12, which just means the system is operating. It will initially start by flashing once, then a pause and then flash twice and it will repeat this three times. You will then see the check engine light flash. Then put the key in the ignition and turn it to the on position but DO NOT start the engine. The above link is to a diagram of your ALDL connector, all you need is a paper clip, straighten out the paper clip and insert one end into the diagnostic test pin and one in the system ground pin (terminals A & B). SOURCE: how do i get the trouble codes off a 1989 mazda mpv?
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