Gas injection and ignition system (PMS) Diagnosis fault memory · ad0754d4000a · Mercedes-Benz WIS

AD07.54-D-4000A

Gas injection and ignition system (PMS) Diagnosis fault memory

25.11.2019

Engine	111.979 in model 902.0, 903.0, 904.0
	with code MS7 (NGT (Natural-Gas Technology) Sprinter)

 Danger	Risk of explosion due to escaping combustible gas or overheating of gas cylinders.Risk of injury caused by burns to skin and eyes. Risk of frostbite to body parts caused by escaping gas and by touching components near the valves when emptying gas cylinders. Risk of poisoning or suffocation caused by inhaling gas.	Remove any sources of ignition. Protective clothing, safety gloves and safety glasses must always be worn. Ensure that the work area is adequately ventilated. When working on vehicles at ambient temperatures over 60 °C, all gas cylinders must be removed.	AS00.00-Z-0018-01A
 Danger	Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)	Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.	AS00.00-Z-0035-01A
	Diagnosis of gas injection and ignition system, prerequisites		AD07.54-D-2000A
	Fault memory
Fault code	Fault text	Possible cause/note	Remedy
           	Coolant temperature sensor   –//– IMPLAUSIBLE Loose contact	Lines, coolant temperature sensor, control unit	AD07.54-D-6000-01A
        	Intake air temperature sensor   –//– Loose contact	Lines, intake air temperature sensor, control unit	AD07.54-D-6000-02A
     	Intake manifold pressure control unit IMPLAUSIBLE Missing	Vacuum line, control unit	AD07.54-D-6000-03A
        	Idle speed contact Implausibly closed Loose contact Implausibly open	Lines, idle speed contact switch, throttle valve actuator motor	AD07.54-D-6000-28A
        	Throttle valve actual value potentiometer Implausibly high Implausibly low Loose contact	Lines, throttle valve actuator motor, control unit	AD07.54-D-6000-05A
        	Throttle valve drive actual value potentiometer Implausibly high Implausibly low Loose contact	Lines, throttle valve actuator motor, control unit	AD07.54-D-6000-06A
        	Idle speed control At lower control stop At upper control stop In limp-home mode	Unmetered air, throttle valve jammed (possibly only occasionally), idle speed control in limp-home mode	AD07.54-D-6000-07A
		Reset control unit memory and reactivate

        	Lambdasensor Sensor voltage too high Sensor cold –//– Sensor signal implausible	Lines, lambdasensor, control unit	AD07.54-D-6000-08A
        	Lambdasensor heating current Too low too large  	Lines, lambdasensor, control unit	AD07.54-D-6000-09A
     	Lambda control rich stop/mixture Too lean Too rich	Unmetered air, gas injection valves,	AD07.54-D-6000-10A
		Engine wear

     	Gas injection valve (cylinders 1 and 4)   +, thermal shutoff –//–,   –	Lines, gas injection valve	AD07.54-D-6000-11A
     	Gas injection valve (cylinders 2 and 3)   +, thermal shutoff –//–,   –	Lines, gas injection valve	AD07.54-D-6000-12A
     	Idle self-adjustment Too rich Too lean	Unmetered air, gas injection valves,	AD07.54-D-6000-13A
		Engine wear

     	Partial load self-adjustment Too rich Too lean	Unmetered air, gas injection valves,	AD07.54-D-6000-14A
		Engine wear

        	Ignition output stage 1 (cylinders 1 and 4)   + Stops working Current value not achieved	Lines, spark plugs, ignition coil	AD07.54-D-6000-15A
        	Ignition output stage 2 (cylinders 2 and 3)   + Stops working Current value not achieved	Lines, spark plugs, ignition coil	AD07.54-D-6000-16A
        	Crankshaft position sensor Not detected/implausible Magnet missing Rotational speed implausibly high	Lines, position sensor, magnet on flywheel segment	AD07.54-D-6000-17A
     	Rpm signal TN output   –   +	Line, control unit	AD07.54-D-6000-19A
     	Vehicle speed signal NOT RECOGNIZED Implausibly high	Line, control unit	AD07.54-D-6000-20A
     	Fuel pump relay –//–,   +   –, thermal shutoff	Lines, relay	AD07.54-D-6000-21A
  	Short-term self-adjustment Idle/partial load exceeded	Short-term malfunction in mixture formation	AD07.54-D-6000-23A
  	Control unit Undervoltage	Lines, battery	AD07.54-D-6000-24A
           	Immobilizer FBS –//–,   + FBS   – FBS blocked FBS implausible	Line, immobilizer (with transponder) control unit	AD07.54-D-6000-25A
     	Exhaust flap   + –//–,   –	Line, switchover valve	AD07.54-D-6000-26A
     	K factor Has been changed Signal implausible	Instrument cluster, K factor not correct
		Check instrument cluster

        	Gas pressure sensor –//–,   –, system defect   +, system defect Loose contact	Line, gas pressure sensor, control unit	AD07.54-D-6000-04A
        	Gas temperature sensor –//–,   –   + Loose contact	Line, gas temperature sensor, control unit	AD07.54-D-6000-22A

Referenced documents

ad0754d2000a Diagnosis of gas injection and ignition system, prerequisites
ad0754d2000a
as0000z001801a Risk of explosion due to escaping combustible gas or overheating of gas cylinders.Risk of injury caused by burns to skin and eyes. Risk of frostbite to body parts caused by escaping gas and by touching components near the valves
as0000z003501a Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)