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DTC P0102/P0103 - Mass Airflow (MAF) Sensor Circuit Input

NOTE: This test is associated with DTC P0102 - MAF Sensor Circuit Low Input and P0103 - MAF Sensor Circuit High Input.
  1. Install scan tool. Start engine and check if DTC P0102 or P0103 is present. If DTC is present, go to next step. If DTC is not present, problem is intermittent. See INTERMITTENTS in TESTS W/O CODES article. Check for disconnected air duct or clogged air filter.
  2. Turn ignition off. Disconnect MAF sensor harness connector. Turn ignition on. Check voltage between sensor harness connector terminal No. 2 and ground. If battery voltage is present, go to next step. If battery voltage is not present, check circuit between harness connector terminal No. 2 and SFI relay. See appropriate wiring diagram in WIRING DIAGRAMS article.
  3. Turn ignition off. Disconnect ECM harness connector. Connect DVOM between ground and MAF sensor harness connector terminal No. 1. Jumper ECM harness connector terminal No. 41 and ground. Continuity should be present. If continuity is not present, check for open in circuit. Remove ground from ECM harness connector terminal No. 41. Continuity should not be present. If continuity is present, check for short in circuit. If circuit is okay, go to next step.
  4. Reconnect ECM harness connector. Check for continuity between MAF harness connector terminal No. 3 and ground. If continuity is present, go to next step. If continuity is not present, check for open in circuit between MAF sensor harness connector and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article.
  5. Check for continuity between MAF harness connector terminal No. 4 and ground. If continuity is present, go to next step. If continuity is not present, check for open in circuit between MAF sensor and ground.
  6. Reconnect MAF sensor harness connector. Using a DVOM connected to ground, backprobe ECM harness connector terminal No. 41. Start engine. With engine at 800 RPM, voltage reading should be 0.7-1.1 volts. With engine at 3000 RPM, voltage reading should be 1.3-2.0 volts. If voltage readings are as specified, go to next step. If voltage readings are not as specified, replace MAF sensor.
  7. Clear DTC. See CLEARING CODES under Self Diagnostic System section. Retest system. If DTC resets, replace ECM.
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