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Home >> Mercedes Benz >> 2001 >> ML430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0507: Idle Speed Control Implausible >> Testing Procedure
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Testing Procedure

  1. Pedal Value Sensor, Signal 1 -  Connect DVOM between ME-SFI control module connector "C" terminals No. 23 and 24 (socket box terminals No. 15 and 16). Turn ignition on. With throttle closed, voltage should be 0.2-0.5 volts. With throttle at Wide Open Throttle (WOT), voltage should be 4.3-4.8 volts. If voltage is within specification, go to next step. If voltage is not within specification, possible causes are voltage supply problem to pedal value sensor (B37), wiring harness failure or pedal value sensor (B37) defective. Repair as necessary. To check voltage supply to pedal value sensor, go to next step.
  2. Pedal Value Sensor, Voltage Supply -  Connect DVOM between ME-SFI control module connector "C" terminals No. 23 and 22 (socket box terminals No. 15 and 14). Turn ignition on. Voltage should be 4.75-5.25 volts. If voltage is okay, go to next step. If voltage is not okay, possible causes are wiring harness failure or ME-SFI control module (N3/10) defective. Repair as necessary.
  3. Pedal Value Sensor, Signal 2 -  Connect DVOM between ME-SFI control module connector "C" terminals No. 26 and 25 (socket box terminals No. 18 and 17). Turn ignition on. With throttle closed, voltage should be 0.1-0.4 volts. With throttle at Wide Open Throttle (WOT), voltage should be 2.1-2.5 volts. If voltage is within specification, go to next step. If voltage is not within specification, possible causes are voltage supply problem to pedal value sensor (B37), wiring harness failure or pedal value sensor (B37) defective. Repair as necessary.
  4. Actual Value Potentiometer 1 Signal Check -  Connect DVOM between ME-SFI control module connector "E" terminals No. 32 and 31 (socket box terminals No. 88 and 87). Turn ignition on. With throttle closed, voltage should be 4-4.6 volts. With throttle fully open, voltage should be less than closed throttle position value. If voltage is within specification, go to next step. If voltage is not within specification, possible causes are voltage supply problem, wiring or throttle valve actuator (M16/6). To check voltage supply, go to step  6 .
  5. Actual Value Potentiometer 2 Signal Check -  Connect DVOM between ME-SFI control module connector "E" terminals No. 32 and 34 (socket box terminals No. 88 and 90). Turn ignition on. With throttle closed, voltage should be 0.3-0.9 volts. With throttle fully open, voltage should be greater than closed throttle position value. If voltage is within specification, go to next step. If voltage is not within specification, possible causes are voltage supply problem, wiring or throttle valve actuator (M16/6). To check voltage supply, go to next step. Repair as necessary.
  6. Actual Value Potentiometers 1 & 2 Voltage Supply Check -  Connect DVOM between ME-SFI control module connector "E" terminals No. 32 and 33 (socket box terminals No. 88 and 89). Turn ignition on. Voltage should be 4.75-5.25 volts. If voltage is within specification, test is complete. If voltage is not within specification, possible causes are wiring harness failure or ME-SFI control module (N3/10) defective. Repair as necessary.
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