Any of these may be required to diagnose a vehicle when diagnostic trouble codes (DTCs) have NOT been set EXCEPT:ĭ) an analog ohmmeter. On-board diagnostics II (OBDII) data are retrieved by connecting a scan tool to the:ĭ) power train control module (PCM). The technician was able to resuscitate the Nissan and shared his solution with others, using Mitchell 1's SureTrack.TERMS IN THIS SET (10) data link connector (DLC). The "check engine" light did not illuminate and no fault codes returned. The tech replaced the mass airflow sensor, cleared codes, test drove the vehicle and completed the code set enable criteria. He then determined there were no circuit faults and the MAF was defective. The measured voltage should have been 1.0V to 1.7V.
With the engine at operating temperature, he used the multimeter to measure voltage at terminal 54 of the PCM, and found 0.4V.
The tech used the multimeter to check for continuity between the MAF sensor connector, and the powertrain control module (PCM) connector, and found continuity was present between the PCM and MAF sensor connectors. He then measured the voltage at the MAF sensor connector with the multimeter, and found battery voltage was present at the connector. With a multimeter, he performed a voltage drop test on the MAF sensor ground wire, and found a 0.1V drop across the ground wire. The MAF sensor should have read 3.3 grams per second at idle. He then monitored live data with the scan tool, and found the MAF sensor read 2.2 grams per second. He then performed an inspection of the mass airflow (MAF) sensor and related wiring harness, but found no obvious faults.
The technician connected a scan tool and found code P0102 – Mass or Volume Air Flow "A" Circuit Low (Hesitates Upon Acceleration, Replaced Mass Airflow Sensor). SureTrack's exclusive Common Replaced Parts feature steered the technician in the direction of the Airflow Sensor.
Real Fixes are documented issues and solutions from actual shop repair orders.Ī customer with a 2002 Nissan Xterra SE (3.3L) comes into the shop, saying the "check engine" light is on and the engine hesitates upon acceleration. The "Real Fix" below from Mitchell 1's SureTrack expert information resource covers a 3.3L Nissan engine that is gasping for 3.3 grams of air per second. Here is a fun technical fact: the size of an engine in liters is usually equivalent to how many grams of air per second it can intake at idle.
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