P202B
Idle speed control implausible (P0507)
Test 1: Check component B37 (Accelerator pedal sensor).
Test 2: Check component M16/6 (Throttle valve actuator).
1. Check component B37 (Accelerator pedal sensor).
Test 1.1: Check component B37 (Accelerator pedal sensor) using actual value.
Test 1.2: Check power supply of component B37 (Accelerator pedal sensor).
1.1. Check component B37 (Accelerator pedal sensor) using actual value.
Warning!Communication with ECU required.
1.2. Check power supply of component B37 (Accelerator pedal sensor).
Test prerequisite
- The actual value is not o.k.
- The power supply of component N3/10 (ME-SFI [ME] control unit) is OK.
Test sequence
- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct voltage with multimeter between sockets (4.16) 101 and (4.04) 89 of the 126-pole socket box tester.
- Measure direct voltage with multimeter between sockets (4.17) 102 and (4.04) 89 of the 126-pole socket box tester.
- Switch on ignition.
Specified value
- Voltage[4.75...5.25] V
Question
- Are the measurement values OK?
YES
The measurement values are OK.Further possible causes of fault
- Signal lines
- B37 (Accelerator pedal sensor)
End of test
NO
The measurement values are not OK.Possible cause and remedy
- Cable for voltage supply
- N3/10 (ME-SFI [ME] control unit)
End of test
2. Check component M16/6 (Throttle valve actuator).
Test 2.1: Check component M16/6 (Throttle valve actuator) using actual value.
Test 2.2: Actuate component M16/6m1 (Actuator motor).
Test 2.3: Check internal resistance of component M16/6m1 (Actuator motor).
Test 2.4: Test series resistance of actual value potentiometers of component M16/6m1 (Actuator motor).
Test 2.5: Test voltage supply of the potentiometers of component M16/6 (Throttle valve actuator).
2.1. Check component M16/6 (Throttle valve actuator) using actual value.
Test prerequisite
- The engine is running.
Status of the relevant actual values:
- M16/6 (Throttle valve actuator) Signal 1:Warning! Communication with ECU required.
- M16/6 (Throttle valve actuator) Signal 2:Warning! Communication with ECU required.
Specified values
- M16/6 (Throttle valve actuator)Signal 1(Idle speed): [0.30...0.90] V
- M16/6 (Throttle valve actuator)Signal 2(Idle speed): [4.00...4.60] V
- M16/6 (Throttle valve actuator)Signal 1(Full load):[4.00...4.60] V
- M16/6 (Throttle valve actuator)Signal 2(Full load):[0.30...0.90] V
Question
- Are the actual values o.k.?
YES
The actual values are okay.End of test
NO
At least one of the relevant actual values is not okay.Possible cause and remedy
- Test series resistance of actual value potentiometers of component M16/6m1 (Actuator motor).
- Check power supply of component M16/6 (Throttle valve actuator).
2.2. Actuate component M16/6m1 (Actuator motor).
Warning!Communication with ECU required.
2.3. Check internal resistance of component M16/6m1 (Actuator motor).
Test prerequisite
- The actual values are not okay.
Test sequence
- Switch off ignition.
- Disconnect coupling 1 at component N3/10 (ME-SFI [ME] control unit).
- (N3/10) 1.Measure resistance with multimeter between sockets 6 and 1.3 (N3/10)
Specified value
- Resistor[1...10]ohms
Question
- Is the measurement value OK?
YES
The measurement value is OK.End of test
NO
The measurement value is not OK.Possible cause and remedy
- Lines between N3/10 (ME-SFI [ME] control unit) and M16/6m1 (Actuator motor)
- M16/6m1 (Actuator motor)
2.4. Test series resistance of actual value potentiometers of component M16/6m1 (Actuator motor).
Test prerequisites
- At least one of the relevant actual values is not okay.
Test sequence
- Switch off ignition.
- Disconnect coupling 2 at component N3/10 (ME-SFI [ME] control unit).
- (N3/10) 2.Measure resistance with multimeter between sockets 2 and 2.3 (N3/10)
Specified value
- Resistor[1800...2000]ohms
Question
- Is the measurement value OK?
YES
The measurement value is OK.Test prerequisites
- At least one of the relevant actual values is not okay.
- The throttle flap of component M16/6 (Throttle valve actuator) should operate freely and must not stick or rub.
Test sequence
- Switch off ignition.
- Remove component B2/5 (Hot film mass air flow sensor).
- Disconnect coupling 2 at component N3/10 (ME-SFI [ME] control unit).
M16/6r1 (Throttle valve actual value potentiometer)
- (N3/10) 2.Measure resistance with multimeter between sockets 9 and 2.3 (N3/10)
- Slowly operate throttle flap by hand up to full load.
Specified values
- Idle speed[ca. 650]ohms
- Full load[ca. 1490]ohms
M16/6r2 (Drive actual value potentiometer)
- (N3/10) 2.Measure resistance with multimeter between sockets 9 and 2.2 (N3/10)
- Slowly operate throttle flap by hand up to full load.
Specified values
- Idle speed[ca. 1380]ohms
- Full load[ca. 480]ohms
Question
- Are the measurement values OK?
YES
The measurement values are OK.Further possible causes of fault
- Test voltage supply of the potentiometers of component M16/6 (Throttle valve actuator).
NO
The measurement values are not OK.Possible cause and remedy
- Lines to component M16/6 (Throttle valve actuator)
- M16/6 (Throttle valve actuator)
NO
The measurement value is not OK.Possible cause and remedy
- Lines to component M16/6 (Throttle valve actuator)
- M16/6 (Throttle valve actuator)
2.5. Test voltage supply of the potentiometers of component M16/6 (Throttle valve actuator).
Test prerequisite
- At least one of the relevant actual values is not okay.
- The power supply of component N3/10 (ME-SFI [ME] control unit) is OK.
Test sequence
- Switch off ignition.
- Detach coupling at component M16/6 (Throttle valve actuator).
- Measure direct voltage with multimeter between pins (M16/6) 2 and (M16/6) 3
- Switch on ignition.
Specified value
- Voltage[4.75...5.25] V
Question
- Is the measurement value OK?
YES
The measurement value is OK.Further possible causes of fault
- M16/6 (Throttle valve actuator)
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Lines to component M16/6 (Throttle valve actuator)
- N3/10 (ME-SFI [ME] control unit)
End of test