Mercedes-Benz Mercedes Benz OEM Parts Mercedes Benz OE Replacement Parts
0237
The request for fan output is implausible.
Possible cause:
- Heat management
Affected functions:
- Engine cooling
-------------------------------------------------
Test 1: Check component M4/7 (Engine and AC electric suction fan with integrated control).
1. Check component M4/7 (Engine and AC electric suction fan with integrated control).
Test 1.1: Check component M4/7 (Engine and AC electric suction fan with integrated control) by means of actuation.
Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963) Diagnostic Trouble Codes Page 261
Test 1.2: Test PWM signal for operating the suction fan.
1.1. Check component M4/7 (Engine and AC electric suction fan with integrated control) by means of actuation.
Check component M4/7 (Engine and AC electric suction fan with integrated control) by means of actuation.
Test prerequisite
- Coolant temperature< 80° C
- Charger connected(The battery voltage must be higher than 12.5 V.)
- Ignition ON
- Engine not running
- Vehicle stationary
- Fuse F32f71 (Fuse 71) is OK.
Actual value:
- Coolant temperature:Warning! Communication with ECU required.
Specified value
- Coolant temperature< 80° C
Proceed to 'Actuation' with F2
1.2. Test PWM signal for operating the suction fan.
Check power supply of component M4/7 (Engine and AC electric suction fan with integrated control).
Test prerequisite
- The ignition must be switched on.
Test sequence
- Check power supply at connector of component M4/7 (Engine and AC electric suction fan with integrated control) (pin 2) against ground.
Specified value
- Voltage[11.0...15.0] V
Continue with button F2
Test PWM signal for operating the suction fan.
Figure legend
- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Test sequence
- Switch off ignition.
- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Switch on ignition.
Warning!
- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2
Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963) Diagnostic Trouble Codes Page 262
Test prerequisite
- Coolant temperature< 80° C
- Charger connected(The battery voltage must be higher than 12.5 V.)
- Ignition ON
- Engine not running
- Vehicle stationary
- There is no fault code present for component B11/4 (Coolant temperature sensor).
- The fuses of component M4/7 (Engine and AC electric suction fan with integrated control) are OK.
Actual values:
- Coolant temperature:Warning! Communication with ECU required.
Continue with button F2
0237
The request for fan output is implausible.
Possible cause:
- Heat management
Affected functions:
- Engine cooling
-------------------------------------------------
Test 1: Check component M4/7 (Engine and AC electric suction fan with integrated control).
1. Check component M4/7 (Engine and AC electric suction fan with integrated control).
Test 1.1: Check component M4/7 (Engine and AC electric suction fan with integrated control) by means of actuation.
Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963) Diagnostic Trouble Codes Page 261
Test 1.2: Test PWM signal for operating the suction fan.
1.1. Check component M4/7 (Engine and AC electric suction fan with integrated control) by means of actuation.
Check component M4/7 (Engine and AC electric suction fan with integrated control) by means of actuation.
Test prerequisite
- Coolant temperature< 80° C
- Charger connected(The battery voltage must be higher than 12.5 V.)
- Ignition ON
- Engine not running
- Vehicle stationary
- Fuse F32f71 (Fuse 71) is OK.
Actual value:
- Coolant temperature:Warning! Communication with ECU required.
Specified value
- Coolant temperature< 80° C
Proceed to 'Actuation' with F2
1.2. Test PWM signal for operating the suction fan.
Check power supply of component M4/7 (Engine and AC electric suction fan with integrated control).
Test prerequisite
- The ignition must be switched on.
Test sequence
- Check power supply at connector of component M4/7 (Engine and AC electric suction fan with integrated control) (pin 2) against ground.
Specified value
- Voltage[11.0...15.0] V
Continue with button F2
Test PWM signal for operating the suction fan.
Figure legend
- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Test sequence
- Switch off ignition.
- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Switch on ignition.
Warning!
- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2
Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963) Diagnostic Trouble Codes Page 262
Test prerequisite
- Coolant temperature< 80° C
- Charger connected(The battery voltage must be higher than 12.5 V.)
- Ignition ON
- Engine not running
- Vehicle stationary
- There is no fault code present for component B11/4 (Coolant temperature sensor).
- The fuses of component M4/7 (Engine and AC electric suction fan with integrated control) are OK.
Actual values:
- Coolant temperature:Warning! Communication with ECU required.
Continue with button F2
