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XL-7 2.7L

  1. Disconnect MAF sensor connector. Turn ignition on. Using a DVOM, measure voltage between MAF sensor connector Blue/Black wire and ground. If battery voltage is indicated, go to next step. If battery voltage is not indicated, repair open or short circuit in Blue/Black wire between MAF sensor and main relay.
  2. Turn ignition off and remove ECM/PCM cover. Reconnect MAF sensor. Turn ignition on and measure voltage (backprobe) between ECM/PCM connector C51-3 terminals No. 5 (Grey/Yellow wire) and No. 10 (Purple/White wire). Voltage reading should be .5-1.0 volt. Start engine. At idle, voltage should read between 1.5-1.8 volts. Voltage should stay below 5 volts but increase as engine speed is increased. If test results are not as specified, go to DTC P0101: MASS AIR FLOW SENSOR - PERFORMANCE PROBLEM under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - XL-7 article.
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