Testing the exhaust back pressure (USA) - ra14006020150x(0150)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Engines 602.96, 603.96/97 TURBO (Model 463.3: for deviations see introductory notes)

Preceding work:

Operation no. of operation texts and work units or standard texts and flat rates:

Fig 1: Testing Exhaust Backpressure

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Digital tester (001) and TDC pulse generator (021)	connect, disconnect.
Screw plug (171)	remove, install.
Tester (020) with connection pipe	connect to exhaust manifold.
Engine	raise to operating temperature (coolant temperature 60-80°C).
Selector lever	move to position "P".
Engine	run up to 4000 rpm. Take test reading.
	Specification: < 2.0 bar. Actual value > 2.5 bar. Perform regeneration of trap oxidizer as follows: with selector lever in position "2", run car on dynamometer or on road for a total of 2 minutes at full load. Test exhaust backpressure at 4000 rpm in position "P". Specification: > 1.5 bar. Repeat regeneration (max. once) if specified value is not reached, renew trap oxidizer and perform EDS brief test.

NOTE: If the customer returns after a relatively short time with the same complaint, determine whether there are any special driving conditions (e.g. frequent short journeys, particularly in colder climatic conditions or with prolonged idling).

Check the following before renewing the trap oxidizer:

EDS brief test (07.1-1120)
Full throttle stop on injection pump (30-1010)
Air cleaner element
Charge pressure (09-5911)
Delivery of fuel pump (07.1-5701)
Fuel filter and pre-filter (07.1-5563)
Start of delivery (07.1-8240 or 8244)

NOTE: Under normal driving conditions the test reading of the exhaust backpressure is approx. 2.0 bar.

TEST DATA

Selector lever in position "P"

Coolant temperature 60-80°C

At 4000 rpm approx. 2.0 bar

Special tools

Fig 2: Identifying Special Tool (903 589 01 90 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Special Tool (603 589 03 21 00 09)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 4: Identifying Special Tool (603 589 00 21 00 07)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

COMMERCIALLY AVAILABLE TESTER

Designation	e. g. make, order no.
Digital tester	Sun, EMT-1019/Master 3, Sun, MCM-2110. All-Test 3610-MB