Preparation for DTC Readout Note

Connect impulse counter scan tool and/or HHT to data link connector (X11/4) according to connection diagram. Yellow wire to socket 7 The Test Program is divided into two sections: Electronic accelerator with ISC Cruise control According to the diagnosis made, troubleshoot by performing only the related test steps in the particular group.

Equipment

Hand-Held Tester (HHT)

see current MBUSA service information in groups 58 and 99

Diagnostic trouble code (DTC)		Possible cause	Test step/Remedy 1)
		No fault in system	-
		EA/CC/ISC control module (N4/1) Safety contact switch (M16/1s1) Stop lamp switch (S9/1) Safety contact switch (M16/1s1) Criuse control switch (S40) OFF EA/CC/ISC control module (N4/1) Actual value potentiometer (M16/1r2) Starter lock-out/back-up lamp switch (S16/3) (transmission range recognition) Closed throttle position switch (S29/3) Engine speed (TNA) signal Vehicle speed signal (VSS) Safety relay within EA/CC/ISC control module (N4/1) EA/CC/ISC control module (N4/1) Engine harness	N4/1 23 5.0 , 6.0 24 2.0 , 3.0 23 5.0 , 7.0 24 1.0 N4/1 23 2.0 , 4.0 23 12.0 23 11.0 23 15.0 23 16.0 N4/1 N4/1 Check harness wire insulation.
		Conditions for activation of EA/CC/ISC actuator (M16/1) not fulfilled.	Conditions: Engine: OFF Transmission range: P/N
		EA/CC/ISC actuator (M16/1) Reference potentiometer (M16/1r1) Actual value potentiometer (M16/1r2) Safety contact switch (M16/1s1) Closed throttle position switch (M16/1s2)	23 2.0 -10.0 23 2.0 , 3.0 23 2.0 , 4.0 23 5.0 , 7.0 23 5.0 , 6.0
		Actuator motor (M16/1m1)	23 9.0
		Magnetic clutch (M16/1k1)	23 10.0
		Reset not accomplished (actuator adaptation)	Erase DTCs: Ignition: OFF Ignition: ON (for at least 90 seconds). If DTC appears: EA/CC/ISC actuator (M16/1)
		Cruise control switch (S40)	24 1.0
		Stop lamp switch (S9/1)	24 2.0 , 3.0
		Starter lock-out/backup lamp switch (S16/1)	23 12.0
		Not valid for U.S.A. vehicles
		CAN databus: Message from EA/CC/ISC control module (N4/1) faulty Message from ABS/ASR control module (N30/1) faulty Message from LH-SFI control module (N3/1) faulty	N4/1, 23 20.0 23 20.0
		Left front axle vehicle speed signal (L6/1) from ABS/ASR control module (N30/1)	23 16.0
		Left rear axle vehicle speed signal (L6/3) from ABS/ASR control module (N30/1)	23 17.0
		Engine speed signal (TNA) from base module (N16/1)	23 15.0
		Fuel safety shut-off signal to LH-SFI control module (N3/1)	23 18.0
		Closed throttle recognition signal to LH-SFI control module (N3/1)	23 19.0
		Voltage supply, circuit 87	23 1.0
		Closed throttle position switch (S29/3)	23 11.0
		Data exchange with ABS/ASR control module (N30/1) implausible	N30/1

1) Observe Preparation for Test, see 22 .