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Test D - Airflow Meter Test

NOTE: Outside temperature must be at least 50°F (10°C) to perform this test.
  1. Code 24. Turn ignition off and wait 10 seconds. Disconnect harness from airflow meter. Inspect for damaged pins, corrosion and loose wires. Repair as required. Turn ignition on. With DVOM on 20 volt scale, measure voltage at airflow meter harness from airflow temperature sensor signal circuit to signal return circuit. If reading is greater than 6 volts, perform Test C. If reading is between 4-6 volts, go to step 4). If reading is less than 4 volts, go to next step.
  2. Turn ignition off and wait 10 seconds. With harness disconnected at airflow meter, disconnect 60-pin connector at ECA. Check for damaged pins, loose wires and corrosion. Install breakout box and leave ECA disconnected. With DVOM on 200 ohm scale, measure resistance at airflow meter harness from temperature sensor circuit to box pin 25. Measure resistance at airflow meter harness from temperature sensor signal return circuit to box pin 46. If both readings are less than 5 ohms, go to step 3). If either reading is 5 ohms or more, repair open circuit, then remove breakout box, reconnect ECA and airflow meter and repeat Quick Test.
  3. Turn ignition off. Airflow meter and ECA disconnected and breakout box installed. With DVOM on 200,000 ohm scale, measure resistance from box pin 25 to box pins 40, 46 and 60 in turn. If any reading is less than 10,000 ohms, repair short circuit. Remove breakout box, reconnect airflow meter and ECA and repeat Quick Test. If all readings are 10,000 ohms or more, go to next step.
  4. Turn ignition off and wait 10 seconds. Reconnect harness at ECA and remove breakout box; airflow meter connector still disconnected. With DVOM on 200,000 ohm scale, measure resistance at airflow meter connector from airflow temperature terminal to signal return terminal. If resistance is not correct for temperature reading as in figure, replace airflow meter and repeat Quick Test. If resistance is correct for temperature reading, replace ECA. Reconnect airflow meter harness and repeat Quick Test.
  5. Code 54. Turn ignition off and wait 10 seconds. Disconnect harness from airflow meter. Check for damaged pins, corrosion or loose wires. Repair as required. Insert a jumper wire in airflow meter harness between airflow temperature signal and signal return. Perform Key On-Engine Off Test. If code 64 is present, replace airflow meter. Remove jumper wire, reconnect airflow meter harness and repeat Quick Test. If no code 64, remove jumper wire and go to next step.
  6. Turn ignition off and wait 10 seconds. With harness disconnected at airflow meter, remove jumper wire. Disconnect 60-pin connector at ECA and check for damaged pins, corrosion or loose wires. Service as required. Install breakout box and leave ECA disconnected. With DVOM on 200 ohm scale, measure resistance at airflow meter harness from airflow temperature signal to box pin 25. Measure resistance at airflow meter harness from signal return to box pin 46. If both readings are less than 5 ohms, replace ECA. If either reading is 5 ohms or more, repair open circuit. After replacing ECA or repairing open circuit, remove breakout box, reconnect airflow meter and ECA and repeat Quick Test.
  7. Turn ignition off and wait 10 seconds. Disconnect harness at airflow meter and check for damaged pins, corrosion or loose wires. Service as required. Perform Key On-Engine Off Test. If no code 54, go to next step. If code 54, replace airflow meter. Reconnect airflow meter and repeat Quick Test.
  8. Turn ignition off and wait 10 seconds. Disconnect harness at airflow meter. Disconnect 60-pin connector at ECA and check for damaged pins, corrosion or loose wires. Repair as required. Install breakout box and leave ECA disconnected. With DVOM on 200,000 ohm scale, measure resistance from box pin 25 to box pins 40, 46 and 60 in turn. If any reading is less than 10,000 ohms, repair short. Remove breakout box, reconnect ECA and airflow meter and repeat Quick Test. If all readings are 10,000 ohms or greater, replace ECA. Remove breakout box, reconnect ECA and repeat Quick Test.
  9. Continuous Monitor Codes 54 & 64. Using Continuous Monitor mode, observe volt/ohmmeter for fault indication while lightly tapping on airflow temperature sensor and then wiggling sensor harness. If fault is indicated, disconnect and inspect harness and connector. If okay, replace airflow temperature sensor and repeat Quick Test. If no fault indicated, go to next step.
  10. Observe volt/ohmmeter while doing the following: Beginning at airflow temperature sensor, wiggle, shake or bend small sections of harness while working way to dash panel. Then repeating process from panel to ECA. If fault is indicated, isolate and repair problem and repeat Quick Test. If no fault indicated, go to next step.
  11. Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and check for damage at ECA pins and connector terminals. Repair as required and repeat Quick Test. If connectors and terminals are okay, fault cannot be duplicated at this time. Continuous Code 54 testing is complete.
Fig 1: Airflow Meter Circuits
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