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Vitara 2.0L

  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) at ECM/PCM connector terminal C51-3 terminal No.10 (Violet/White wire). Voltage reading should be 1.0-1.6 volts. Start engine. At idle, voltage should read between 1.7-2.0 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 (MAF) SENSOR CIRCUIT PERFORMANCE PROBLEM under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - VITARA 2.0L article.
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