Troubleshooting

DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT

CIRCUIT DESCRIPTION

DTC Detection Condition:

The mass air flow meter uses a platinum hot wire. The hot wire mass air flow meter consists of a platinum hot wire, a thermistor and a control circuit installed in a plastic housing. The hot wire mass air flow meter works on the principle that the hot wire and thermistor located in the intake air bypass of the housing detect any changes in the intake air temperature.

The hot wire is maintained at the set temperature by controlling the current flow through the hot wire. This current flow is then measured as the output voltage of the mass air flow meter.

The circuit is constructed so that the platinum hot wire and thermistor provide a bridge circuit, with the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.







HINT: After confirming DTC P0100, P0102, P0103 use the hand-held tester or the OBD II scan tool to confirm the mass air flow ratio from the CURRENT DATA.

Wiring Diagram:

Step 1:

Step 2 - 3:

Step 4 - 5:

Step 6:

INSPECTION PROCEDURE

HINT: Read freeze frame data using hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.