Gasoline injection and ignition system (ME-SFI) - Diagnosis - Trouble-shooting · ad0761p5000a · Mercedes-Benz WIS

AD07.61-P-5000A

Gasoline injection and ignition system (ME-SFI) - Diagnosis - Trouble-shooting

25.11.2019

Engine

112.910/920/923/943, 112.911/921/940/941/942 up to 5/31/00

 Danger	Risk of death. Death may occur if body parts are drawn into rotating vehicle parts.	Do not insert your hand into rotating parts. Wear closed and snug-fitting work clothes. Secure area of rotating vehicle components against unauthorized access.	AS00.00-Z-0004-01A
 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
 Danger	Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.	No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only. Wear protective clothing when handling fuel.	AS47.00-Z-0001-01A
Topical note	Notes on avoiding damage to ignition system		AH15.10-P-0002-01D
	Gasoline injection and ignition system (ME-SFI) - Diagnosis - Previous knowledge		AD07.61-P-2000A
	Troubleshooting
Complaint	Possible cause	Notes	Remedy
Engine slow to start and accelerate	Injection valves actuation and injection duration Hot film MAF sensor (B2/5) Coolant temperature sensor (B11/4) Ignition voltage too low Unmetered air	3/11	AD07.61-P-6000-18A
			AD07.61-P-6000-19A

			AD07.61-P-6000-20A

			AD07.61-P-6000-21A

			AD07.61-P-6000-22A

			AD07.61-P-6000-23A

		2/11	AD07.61-P-6000-04A

			AD07.61-P-6000-05A

		4/11	AD07.61-P-6000-08A

		–	AD07.61-P-6001-17A

		–	Eliminate unmetered air

Engine fails to start	Power supply missing Malfunction in drive authorization system (DAS) Fuel pump (FP) No compression pressure as oil pressure too high Ignition voltage too low	–	AD07.61-P-6000-01A
			AD07.61-P-6000-02A

			AD07.61-P-6000-03A

		Drive authorization 1/1	AD07.61-P-6000-34A



		–	AD07.61-P-7001-01B

		–	Check compression pressure and/or oil pressure

			AD07.61-P-6001-17A

		–

Engine has rough idling	Injection valves actuation and injection duration Unmetered air	3/11	AD07.61-P-6000-18A
			AD07.61-P-6000-19A

			AD07.61-P-6000-20A

			AD07.61-P-6000-21A

			AD07.61-P-6000-22A

			AD07.61-P-6000-23A

		–	Eliminate unmetered air

Poor engine output	Catalytic converter has too low flow rate Lambda sensor LH/RH upstream of catalytic converter Coolant temperature sensor (B11/4) Hot film MAF sensor (B2/5) Variable intake manifold inoperative Knock control at control stop	–	Check exhaust gas back pressure, see Diagnosis Manual Volume 1, Index A "Engine output"
			AD07.61-P-6000-10A

			AD07.61-P-6000-11A

			AD07.61-P-6000-12A

			AD07.61-P-6000-13A

		8/11	AD07.61-P-6000-08A

			AD07.61-P-6000-04A



			AD07.61-P-6000-28A

		4/11

		2/11	Knock sensors



		_



		2/11

Engine runs irregularly (shakes)	Injection valves actuation and injection duration Injection valves leaky, spray pattern Lambda sensor LH/RH upstream of catalytic converter Ignition voltage too low Compression pressure of one or more cylinders too low Unmetered air Exhaust gas recirculation valve leaky/jams	3/11	AD07.61-P-6000-18A
			AD07.61-P-6000-19A

			AD07.61-P-6000-20A

			AD07.61-P-6000-21A

			AD07.61-P-6000-22A

			AD07.61-P-6000-23A



		–	AD07.61-P-7002-01A

			AD07.61-P-7002-01B

		8/11	AD07.61-P-6000-10A

			AD07.61-P-6000-11A

			AD07.61-P-6000-12A

			AD07.61-P-6000-13A

		–	AD07.61-P-6001-17A

		–	Check compression pressure

			Eliminate unmetered air

		–	Replace exhaust gas recirculation valve

		–

Engine runs irregularly (misfire)	Ignition voltage too low Hot film MAF sensor (B2/5)	–	AD07.61-P-6001-17A
		2/11	AD07.61-P-6000-04A

Engine surges after cold start	Unmetered air	–	Eliminate unmetered air
Transition fault in warm-up	Coolant temperature sensor (B11/4) Hot film MAF sensor (B2/5) Unmetered air	4/11	AD07.61-P-6000-08A
		2/11	AD07.61-P-6000-04A

		–	Eliminate unmetered air

Transition fault in warm-up or poor fuel economy	Lambda sensor LH/RH upstream of catalytic converter Purge control valve (Y58/1) constantly open (jams)	8/11	AD07.61-P-6000-10A
			AD07.61-P-6000-11A

			AD07.61-P-6000-12A

			AD07.61-P-6000-13A

		4/11	AD07.61-P-6000-29A

			AD07.61-P-6000-30A

Engine jerks	Hot film MAF sensor (B2/5) Ignition voltage too low Lambda sensor LH/RH upstream of catalytic converter	2/11	AD07.61-P-6000-04A
			AD07.61-P-6000-05A

		–	AD07.61-P-6001-17A

		8/11	AD07.61-P-6000-10A

			AD07.61-P-6000-11A

			AD07.61-P-6000-12A

			AD07.61-P-6000-13A

Electronic accelerator is in limp-home function	Set value potentiometer in pedal value sensor Actual value potentiometer in actuator	5/11	AD07.61-P-6002-01A
			AD07.61-P-6002-01B

		5/11	AD07.61-P-6002-03A

Referenced documents

ad0761p2000a Gasoline injection and ignition system (ME-SFI) - Diagnosis - Previous knowledge
ad0761p2000a
ah1510p000201d Notes on avoiding damage to ignition system
as0000z000401a Risk of death. Death may occur if body parts are drawn into rotating vehicle parts.
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)
as4700z000101a Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.