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EC-174 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0102, P0103 MAF SENSOR 4. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 7. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 7. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Check the continuity between MAF sensor harness connector and ECM harness connector. 2. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 8. NO >> Repair open circuit, short to ground or short to power in harness or connectors. 8. CHECK MASS AIR FLOW SENSOR EC-174, "Component Inspection" Is the inspection result normal? YES >> GO TO 9. NO >> Replace mass air flow sensor. Refer to . 9. CHECK INTERMITTENT INCIDENT GI-44, "Intermittent Incident" >> INSPECTION END Component Inspection INFOID:0000000009719911 1. CHECK MASS AIR FLOW SENSOR-I With CONSULT 1. Reconnect all harness connectors disconnected. 2. Start engine and warm it up to normal operating temperature. 3. Connect CONSULT and select “DATA MONITOR” mode. 4. Select “MAS A/F SE-B1” and check indication under the following conditions. *: Check for linear voltage rise in response to engine being increased to approximately 4,000 rpm. Without CONSULT 1. Reconnect all harness connectors disconnected. 2. Start engine and warm it up to normal operating temperature. 3. Check the voltage between ECM harness connector terminals under the following conditions. MAF sensor ECM Continuity Connector Terminal Connector Terminal F4 4 F8 56 Existed MAF sensor ECM Continuity Connector Terminal Connector Terminal F4 3 F8 58 Existed Monitor item Condition MAS A/F SE-B1 (V) MAS A/F SE-B1 Ignition switch ON (Engine stopped.) Approx. 0.4 Idle (Engine is warmed-up to normal operating temperature.) 0.9 - 1.2 2,500 rpm (Engine is warmed-up to normal operating temperature.) 1.6 - 1.9 Idle to approximately 4,000 rpm 0.9 - 1.2 to Approx. 2.4* |