Idle speed control (ISC) actuator/Idle air control valve (IAC) valve. Idle Speed Control (ISC) System - Malfunction Malfunction Indicator Lamp (MIL) Triggered on first occurrence. Oxygen Sensor (O2S) 1, Bank 1 - Circuit Malfunction Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information). * Unplug and reconnect the MAF wiring harness a few times to clear the contacts. * Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires. Then start with the cheapest, easiest repair procedures: Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back. * The MAF may be disconnected, or a wiring connection may be bad. You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.Ī code P0100 may mean one or more of the following:

If the fuel pressure is within the specification, replace the fuel filter and retest at the high pressure pump to verify the system function.Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit. If the fuel pressure is below specification, move the gauge to the fuel filter input line and retest.Ħ.If the fuel pressure is still below specification, replace the fuel pump. If no problem is found with the fuel system replace the low pressure fuel pump.Ģ.Connect a fuel gauge to the low pressure fuel supply to the high pressure pumpĤ.Turn the ignition to the on position and observe the fuel gauge reading.ĥ.The fuel pressure should be 4.0 to 4.5 bar (58-65 psi).

If the pressure reading is below specification, look for damaged or leaking fuel lines or a restricted fuel filter. The low pressure pump draws fuel out of the fuel tank module and pushes the fuel towards the fuel filter. When the ignition switch is turned to the on position the fuel pump will begin to run for 20-30 seconds and then it stops. Capture any fuel spillage and store in appropriately marked containers. Assure that the fuel pump fuse or relay is not open. Assure fuel tank quantity and proper fuel gauge operation.

STANDARD PROCEDURE - LOW PRESSURE FUEL PUMP TEST

Sprinter mass air flow sensor problems