With starting or warm up complaints do not condition engine to operating conditions but proceed according to complaint.

Listing of Test Steps

1	Test equipment	connect/disconnect according to Connection Diagram.
2	Base module DTC readout Ignition: ON	perform.
3	LH-SFI control module DTC readout Ignition: ON	perform.
4	DI control module DTC readout Ignition: ON	perform.
5.0	EA/CC/ISC control module DTC readout Ignition: ON	perform.
5.1	CC/ISC control module DTC readout Ignition: ON	perform.
6	Air filter	remove and install.
7.0	Throttle control linkage	check throttle valve for free movement and condition. Lubricate all bearings, gate levers and ball sockets.
7.1	WOT contact	check, adjust.
7.2	CTP contact	check using accelerator pedal, adjust.
8	Control pressure cable of AT	check, adjust.
9	Fuel pressure	check. (Engine must be at closed throttle to test)
10	Engine coolant level	check, correct.
11	Engine oil level	check, observe condition of oil.
12	Ignition system, primary, secondary Engine: at Idle	check (see Test and Adjustment Data, Section A).
13	Ignition timing and vacuum advance Engine: at Idle	check (see Test and Adjustment Data, Section A).
14	Oscilloscope pattern brief acceleration to 3000 rpm Engine: at Idle	evaluate (see Test and Adjustment Data section C).
15	Engine oil temperature	approximately 80 °C.
16	CTP RPM	check.
17	On-off ratio control system	check(readout oscillates).
18	Not applicable for U.S. version vehicles	-
19	CTP speed under load	check in TR "D" (service and parking brake applied) and with all accessories turned on.

Connection chart for test equipment without diagnostic adapter for two circuit ignition systems

Test equipment version	Cylinder no. setting on test equipment	Type of measurement	Circuit on Diagnostic socket			Trigger clamp on ignition cable	kV-Clamp on ignition cable ignition circuit
			X11 Engine 119	X11/2 Engine 120 L.	X11/3 Engine 120 R.
Bear DACE (Model 40-960) Sun MEA-1500MB	Engine 119: 4 Engine 120: 6	RPM/ dwell angle of Ignition circuit	T1/1		T1/1
		RPM/ dwell angle of Ignition circuit		T1/2
		Timing of Ignition circuit	T1/1		T1/1	Cylinder 1	Engine 119 : T1/1 Engine 120 : T1/1
		Timing of Ignition circuit	T1/2	T1/2		Engine 119 : cyl. 2 1) Engine 120 : cyl. 12	Engine 119 : T1/2 Engine 120 : T1/2
		Oscilloscope primary/secondary and voltage at terminal 15/1 of Ignition coil	T1/1		T1/1	Engine 119 : cyl. 1 Firing order 1-4-6-7 Engine 120 : cyl. 1 Firing order 1-5-3-6-2-4	Engine 119 : T1/1 Firing order 1-4-6-7 Engine 120 : T1/1 Firing order 1-5-3-6-2-4
		Oscilloscope primary/secondary and voltage at terminal 15/1 of Ignition coil		T1/2		Engine 119 : cyl. 5 Firing order 5-8-3-2 Engine 120 : cyl. 12 Firing order 12-8-10-7-11-9	Engine 119 : T1/2 Firing order 5-8-3-2 Engine 120 : T1/2 Firing order 12-8-10-7-11-9

1) On engine 119 subtract 90 °CKA from measured value. Example: measured: 107 °CKA, 107-90= 17 °ignition timing

Notes regarding on/off ratio check using on/off ratio tester The operation of the on-off ratio control can be tested by checking the on-off ratio. In addition, any malfunctions that exist momentarily can be recognized. The tests distinguish between malfunctions that occur with the ignition ON or with the engine at idle . The on-off ratio can be checked using the on-off ratio tester or engine analyzer. An on-off ratio of 50% indicates that all input signals are OK, but on-off ratio control is not functioning. A varying on-off ratio indicates that the on-off ratio control is functioning correctly. On-off ratios from 10% to 95% are each assigned a specific malfunction (see DTC memory, DM Engines, Volume 2, Section 2). After testing the on-off ratio, a diagnostic trouble code (DTC) readout using the impulse counter scan tool must always be performed. Notes regarding diagnostic trouble code (DTC) readout using the Impulse counter scan tool When diagnosing engine running complaints, or when the CHECK-ENGINE lamp is illuminated, the DTC memory should be read out and the DTC's noted before any repairs are attempted. This will ensure that the technician can differentiate between actual malfunctions and "simulated malfunctions," since testing done on a running engine will cause malfunctions to be stored that were caused by a simulation or a disconnected circuit. When testing is completed, the DTC memory of the LH-SFI control module, base module, DI control module and the EA/CC/ISC control module or CC/ISC control module must be cleared.

Notes regarding DTC readout using Impulse counter scan tool 1. Connect impulse counter scan tool according to diagram. The LED "U-Batt" should come on. If not, check the following: a) Voltage supply. b) Impulse counter scan tool fuse. 2. DTC memory readout a) Ignition: ON. b) Push start button for 2-4 seconds. c) Read and record DTC readout. d) Push start button again. e) Read and record DTC readout. Repeats steps d) and e) until the first DTC readout reappears. 3. Clearing DTC memory Note: The clearing process must occur within 20 seconds after the DTC readout. a) Ignition: ON b) Push start button 2-4 seconds (Impulse display appears). c) After a waiting period of 3 seconds, push the start button for 6-8 seconds which will erase the previously displayed DTC. d) Erase each DTC separately. e) Turn off ignition for at least 30 seconds.

Equipment

Engine analyzer 1)	Bear DACE (Model 40-960) Sun MEA-1500MB
Digital multimeter 1)	Fluke models 23, 83, 85, 87

1) Available through the MBUSA Standard Equipment Program.

Note: The on-off ratio control system test should not be performed on a very hot engine, for example, after a fast drive or after an output test on a dynamometer.

Test step/Test sequence	Test condition	Nominal value	Possible cause/Remedy 1)
1 Connect test equipment according to diagram	Ignition: OFF	-	-
2 Base module DTC readout	Connect impulse counter scan tool: Yellow wire to socket 8 of data link connector (X11/4) Ignition: ON	DTC readout	See DM Engines, Vol. 2 - 3.1 or 3.2
3 LH-SFI control module DTC readout	Connect impulse counter scan tool: Yellow wire to data link connector (X11/4). Engine 104, 119 Socket 4 Engine 120 Socket 5, left LH-SFI control module (cyl. 7 - 12) Socket 4, right LH-SFI control module (cyl. 1 - 6) Ignition: ON	DTC readout	See DM Engines, Vol. 2 - 3.1 or 3.2
4 DI control module DTC readout	Connect impulse counter scan tool: yellow wire to data link connector (X11/4) Engine 104, 119 Socket 17 Engine 120 Socket 18, left DI control module (cyl. 7 - 12) Socket 17, right DI control module (cyl. 1 - 6) Ignition: ON	DTC readout	See DM Engines, Vol. 2 - 5.2 or 5.3
5.0 EA/CC/ISC control module (N4/1) DTC readout	Connect impulse counter scan tool: yellow wire to socket 7 of data link connector X11/4 Ignition: ON	DTC readout	See DM Engines, Vol. 2 - 6.2 or 6.3
5.1 CC/ISC control module (N4/3) DTC readout	Connect impulse counter scan tool: yellow wire to socket 7 of data link connector X11/4 Ignition: ON	DTC readout	See DM Engines, Vol. 2 - 7.1
5.2 Not applicable for U.S. version vehicles	-	-	-
6 Remove and install air cleaner	Ignition: OFF	-	-
7 Check condition and free movement of throttle linkage and throttle valve	Ignition: OFF Actuate throttle linkage	Smooth operation, no binding should be evident.	Lubricate all bearings and ball sockets.
7.1 Check WOT position	Ignition: OFF Accelerator pedal at WOT position (do not actuate kickdown switch).	Throttle valve lever must rest against wide open throttle stop (audible contact).	Adjust WOT stop (SMS, Job No. 30 - 1010).
7.2 Check CTP	Ignition: OFF Accelerator pedal at CTP.	Throttle valve lever must rest against closed throttle stop (audible contact).	Adjust CTP stop on engine (SMS, Job No. 30 - 1010).
8 Check automatic transmission control pressure cable	Ignition: OFF Accelerator pedal at CTP.	Arrows must align.	Adjust control pressure cable (SMS, Job No. 30 - 1010).
9 Check fuel pressure	Connect/disconnect pressure gauge Engine: at Idle	3.2 to 3.6 bar	Check fuel pumps and FP relay module (DM Engines, Vol. 2 - 3.1 or 3.2).
10 Engine coolant level	Ignition: OFF	Marking: min - max	Correct engine coolant level
11 Engine oil level	Ignition: OFF	Marking: min - max	Correct engine oil level
12 Check primary and secondary ignition circuits	Ignition: at Idle	See Test and Adjustment Data (Section A)	Check ignition system (DM Engines, Vol. 2 - 5.2 or 5.3)
13 Check ignition timing with and without vacuum	Engine: at Idle Transmission range "P" Climate control system: OFF	See Test and Adjustment Data (Section A)	Check ignition system (DM Engines, Vol. 2 - 5.2 or 5.3)
14 Evaluate oscilloscope patterns	Engine: at Idle Briefly accelerate to 3000 rpm	Voltage difference between cylinders 3kV. Voltage increase with engine accelerated should be no more than 6 kV over idle value.	Check ignition system (DM Engines, Vol. 2 - 5.2 or 5.3)
15 Warm engine oil to operating temperature	Engine rpm: Maintain at approx. 3000 rpm	Engine oil temperature approx. 80 °C	-
16 Check closed throttle (idle) rpm	Engine: at Idle Selector lever in "P", climate control system "OFF".	See Test and adjustment data (section A)	Test program: Check EA/CC/ISC system (DM Engines, Vol. 3 - 6.2 or 6.3), Check CC/ISC system (DM Engines, Vol. 3 - 7.1)
17 Check on-off ratio control system	Selector lever in "P", Climate control system OFF. Disconnect and plug purge line (A or B) at switchover valve (Figure 1, 3 and 4). Reconnect line after measurment. Engine: at Idle	See Test and adjustment data (section A)	Check electonic components with socket box tester (DM Engines, Vol. 2 - 3.1 or 3.2)
18 Not applicable for U.S. version vehicles	-	-	-
19 Check CTP speed under load	Engine: at Idle TR "D" (service and parking brake applied), Switch on all electrical consumers, Turn steering wheel to full lock.	Engine must continue to idle within specified range.	Test program: Check EA/CC/ISC system (DM Engines, Vol. 3 - 6.2 or 6.3), Check CC/ISC system (DM Engines, Vol. 3 - 7.1)

1) Observe Preparation for Test, see 22 .