Engine Test, Adjustment
NOTE:
- With starting or warm up complaints do not condition engine to operating conditions but proceed according to complaint.
- Refer to "Test and Adjustment Data [Specifications]" for measured readings. Test and Adjustment Data [Specifications]
Listing of Test Steps
1 Test equipment
Connect/disconnect according to connection diagram.
2 Engine control module version
Ignition: ON
Read, only possible using hand-held tester (HHT).
3 Engine coolant level
Check, correct.
4 Engine oil level
Check, observe condition of oil.
5 Diagnostic trouble codes (DTC's) in Engine control module (HFM-SFI)
Ignition: ON
Read using HHT or impulse counter scan tool. HFM-SFI (Sequential Multiport Fuel Injection and Ignition)
6 DTC's in electronic accelerator/cruise control/idle speed control (EA/CC/ISC) control module
Ignition: ON
Read using HHT or impulse counter scan tool. EA/CC (Electronic Accelerator/Cruise Control) - With ASR
6.1 DTC's in cruise control/idle speed control (CC/ISC) control module
Ignition: ON
Read using HHT or impulse counter scan tool. CC/ISC (Cruise Control/Idle Speed Control) - Without ASR
6.2 DTC's in ISC control module
Ignition: ON
Read using HHT or impulse counter scan tool. CC/ISC (Cruise Control/Idle Speed Control) - Without ASR
7 Throttle control linkage
Check throttle valve for free movement and condition. Lubricate bearings, gate levers and ball sockets.
7.1 WOT contact *
Check using accelerator pedal, adjust.
7.2 CTP contact *
Check, adjust.
7.3 Control pressure cable of automatic transmission (AT)
Check, adjust.
8 Fuel pressure
Check Fuel System Pressure and Internal Leakage Test
NOTE: Relieve pressure via valve on gauge.
9 Engine rpm (at Idle)
Check, only possible using HHT Test and Adjustment Data [Specifications]
10 Ignition timing -> Engine: at Idle
Check
(Socket 1 on socket box or TNA signal from data link connector X11/4,socket 10).
11 Selector lever position -> Engine: at Idle
Check.**
12 Not applicable for U.S. version vehicles.
13 AIR pump -> Engine: at Idle
Check.**
14 Deceleration shut-off -> Engine: Decelerating
Check.**
15 Injection time -> Engine: at Idle
Check.**
16 Air mass/pressure -> Engine: at Idle
Check.**
17 Self-adaptation -> Engine: at Idle/partial load
Check.**
18 On-off ratio control -> Engine: at Idle
Check.**
19 Throttle valve angle -> Engine: at Idle
Check.**
20 O2S voltage
Check.**
21 Not applicable for U.S. version vehicles.
22 CTP speed under load
Check in TR "D" (with service and parking brake applied) and with all consumers turned ON.
23 Battery voltage
Check.**
24 Ignition fault counter
Check.**
25 Coil fault counter
Check.**
26 Coil spark duration
Check.**
27 Coil spark voltage
Check.**
28 Knock ignition angle
Check.**
* Wide open and closed throttle contact only possible using HHT.
** Only possible using HHT Test and Adjustment Data [Specifications]
Connection Diagram:
A Throttle Linkage
X11/4 Data Link Connector, (DTC readout, 38-pole)
013 Impulse Counter Scan Tool
014 Exhaust Vent Hose
042 Pressure Gauge
075 Impulse Counter Scan Tool Adapter
087 Hand-Held Tester (HHT)
Connection Diagram, Impulse Counter Tool/HHT:
013 Impulse Counter Scan Tool
075 Impulse Counter Scan Tool Adaptor
087 Hand-Held Tester (HHT)
094 Multiplexer
X11/4 Data Link Connector (DTC readout)
DTC Readout
Impulse Counter Scan Tool
Black wire (circuit 31, ground) Socket 1
Red wire (circuit 15, ignition) Socket 16
Yellow wire (diagnostics HFM-SFI) Socket 8
Hand-Held Tester (HHT)
a) on X11/4, 16-pole
Black wire (circuit 31, ground) Socket 1
White wire (circuit 15, ignition) Socket 16
Red wire (circuit 30) Battery + or X11/4
Yellow wire (diagnostics HFM-SFI) Socket 8
b) with multiplexer (094) on X11/4, 38-pole
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.
Repeat steps d) and e) until the first DTC readout reappears.
3. Clearing DTC memory
a) Ignition: ON
b) Press start button for 2-4 seconds (DTC appears).
c) Push start button 6-8 seconds, thereby clearing the previously displayed malfunction (DTC) from memory.
d) Repeat steps b) and c) until DTC "1" (no stored DTC's) appears.
4. Resetting and Reactivating the Engine Control Module DTC Memory
a) Clear DTC's from memory.
b) After DTC "1" reappears, press start button for 6-8 seconds.
c) Turn ignition OFF and wait at least 2 seconds.
d) Turn ignition ON and wait at least 10 seconds. Then start engine.