USING DIAGNOSTIC CHARTS
Use following illustrations to understand diagnostic charts and identify symbols used. (Scheme 92)- (Scheme 94).
Scheme 92
Scheme 93
Scheme 94
TROUBLE SHOOTING
Note. For aid in using diagnostic charts, see USING DIAGNOSTIC CHARTS .
Before diagnosing by symptom, retrieve diagnostic trouble codes. See SELF-DIAGNOSTIC SYSTEM. If no diagnostic trouble codes exist, diagnose by symptom. (Scheme 95)
Scheme 95
SELF-DIAGNOSTIC SYSTEM
Note. Diagnostic trouble codes can be retrieved from many different modules. Codes and testing listed in this article are for codes retrieved from the EA/CC/ISA control module. To retrieve diagnostic trouble codes, see RETRIEVING & CLEARING DIAGNOSTIC TROUBLE CODES (SECTION 11) .
Using Impulse Counter Scan Tool
Note. The DTC memory can only be read with the impulse counter scan tool only on vehicles up to Diagnosis Version 46. On vehicles as of Diagnosis Version 49, DTCs may only be read with the HHT. See USING HAND HELD TESTER .
- Connect Impulse counter scan tool Data Link Connector (X11/4) according to connection diagram. see scheme 10 Connect the Yellow wire of the impulse counter scan tool to the diagnostic output socket of the system to be tested. See «IMPULSE COUNTER DIAGNOSTIC OUTPUT SOCKET IDENTIFICATION»(ref-156448-S04831432482003080700000) table.
- Turn ignition on. Press start button for 2-4 seconds. Read and record Diagnostic Trouble Code (DTC).
- Press start button again for 2-4 seconds to read the next DTC.
- Repeat step 3 until all DTC have been read.
- To clear a DTC, wait 3 seconds after DTC is displayed then press the start button for 6-8 seconds. Each DTC must be cleared individually.
| System To Be Tested | Diagnostic Output Socket No. | |
|---|---|---|
| EA/CC/ISC | ||
| 16-Pin DLC | 14 | |
| 38-Pin DLC | 7 | |
| Model 210 | (1) | |
| Engine Control Module (HFM-SFI) | ||
| 16-Pin DLC | 8 | |
| 38-Pin DLC | 4 | |
| Diagnostic Module | ||
| 16-Pin DLC | 3 | |
| 38-Pin DLC | 19 | |
| Base Module | ||
| 38-Pin (Except 202 & 210 Models) | 8 | |
| Engine RPM Signal | ||
| 38-Pin (Engine Speed (TN) Output, Except 202 & 210 Models) | 13 | |
| 38-Pin (Engine Speed (TN) Output, 202 & 210 Models) | 17 | |
| (1) Diagnostic trouble code cannot be retrieved using the impulse counter scan tool. See USING HAND HELD TESTER . | ||
| (1) | Diagnostic trouble code cannot be retrieved using the impulse counter scan tool. See USING HAND HELD TESTER . |
IMPULSE COUNTER DIAGNOSTIC OUTPUT SOCKET IDENTIFICATION
Scheme 96
DIAGNOSTIC TROUBLE CODE DEFINITIONS
Note. Observe Preparation for Test, see PREPARATION FOR TEST (SECTION 22)
| Generic DTC | Mercedes-Benz DTC | Description | Test step/Remedy |
|---|---|---|---|
| 1 | No fault in system | ||
| 2 | 002 | EA/CC/ISC control module (N4/1) | N4/1 |
| 2 | 006 | Safety contact switch (M16/1s1) | 5.0, 6.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 4.0 & 5.0 , Electronic Acceleration System Tests 6.0 |
| 2 | 006 | Stop lamp switch (S9/1) | 4.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 4.0 & 5.0 |
| 2 | 006 | Safety contact switch (M16/1s1) | 7.0, see Electronic Acceleration System Tests 7.0 |
| 2 | 006 | Cruise control switch (S40) OFF | 1.0, see Cruise Control System Tests 1.0 |
| 2 | 006 | EA/CC/ISC | N4/1 |
| 2 | 007 | Actual value potentiometer (M16/1r2) | 4.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 4.0 & 5.0 |
| 2 | 007 | Starter lock-out/back-up lamp switch (S16/3) (transmission range recognition) | 12.0, see Electronic Acceleration System Tests 12.0 3.0, see Cruise Control System Tests 3.0 |
| 2 | 007 | Closed throttle position switch | 11.0, see Electronic Acceleration System Tests 11.0 |
| 2 | 007 | Engine speed (TNA) signal | 14.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 13.0 & 14.0 |
| 2 | 008 | Vehicle speed signal (VSS) | 15.0, 16.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 15.0 & 16.0 , Electronic Acceleration System Tests 16.0 - 18.0 |
| 2 | 008 | Safety relay within EA/CC/ISC control module (N4/1) | N4/1 |
| 2 | 009 | EA/CC/ISC controlmodule (N4/1) | N4/1 |
| 2 | 025 | Engine Harness | Check harness wire insulation. |
| 037 | Conditions for activation of EA/CC/ISC actuator (M16/1) not fulfilled. | Conditions: Engine: OFF Transmission range: P/N | |
| 3 | 048 | Reference potentiometer (M16/3r1) | 3.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 2.0 & 3.0 |
| 3 | 049 | Actual value potentiometer (M16/3r2) | 4.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 4.0 & 5.0 |
| 3 | 050 | Safety contact switch (M16/3s1) | 7.0, 8.0, see Electronic Acceleration System Tests 7.0 , Electronic Acceleration System Tests 8.0 |
| 3 | 051 | Closed throttle position switch (M16/1s2) | 6.0, 8.0, see Electronic Acceleration System Tests 6.0 , Electronic Acceleration System Tests 8.0 |
| 3 | 052 | Actuator motor (M16/1m1) | 9.0, see Electronic Acceleration System Tests 9.0 |
| 3 | 053 | Magnetic clutch (M16/1k1) | 10.0, see Electronic Acceleration System Tests 10.0 |
| 3 | 054 & 056 | EA/CC/ISC actuator (M16/1) | 2.0-10.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 2.0 & 3.0 - Electronic Acceleration System Tests 10.0 |
| 3 | 055 | Reset not accompmlished (actuator adaptation) | Erase DTC: Ignition: OFF Ignition: ON (for at least 90 seconds). If DTC reappears: EA/CC/ISC actuator (M16/1) |
| 3 | 57 | Reference potntionmeter (m16/1r1) (voltage supply) | 2.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 2.0 & 3.0 |
| 4 | 064 | CC switch (S40) | 1.0, see Cruise Control System Tests 1.0 |
| 5 | 080 | Stop lamp switch (S9/1) | 2.0, see Cruise Control System Tests 2.0 |
| 6 | 096 | Starter lock-out/backup lamp switch (S16/1) | 12.0, see Electronic Acceleration System Tests 12.0 3.0 Cruise Control System Tests 3.0 |
| 6 | 097 | Not applicable to U.S. version vehicles | |
| 7 | 112, 115 & 117 | CAN databus: Message from EA/CC/ISC control module (N4/1) faulty Reception from engine control module (N3/4) faulty | 20.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 19.0 & 20.0 N4/1 |
| 8 | 128-130 | Left front axle VSS (L6/1) from ASR control module (N30/1) | 15.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 15.0 & 16.0 |
| 9 | 144 | Models 129, 140, 202, 210: Left rear axle VSS (L6/3) from ASR control module (N30/1) | 16.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 15.0 & 16.0 |
| 9 | 144 | Model 124: Hall-effect speed sensor (B6) | 17.0, see Electronic Acceleration System Tests 16.0 - 18.0 |
| 10 | 160 | Engine speed signal (TN) from engine control module (N3/4) | 14.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 13.0 & 14.0 |
| 11 | 176-178 & 182 | Fuel safety shut-off signal to engine control module (N3/4) | 18.0, see Electronic Acceleration System Tests 16.0 - 18.0 |
| 11 | 180 | Closed throttle recognition signal to engine control module (N3/4) | 19.0, see ELECTRONIC ACCELERATION SYSTEM TESTS 19.0 & 20.0 |
| 14 | 007 & 224 | CTP switch (S29/3) | 11.0, see Electronic Acceleration System Tests 11.0 |
| 15 | 240 | CAN databus: data exchange with ASR control module (N30/1) implausible | ASR control (N30/1) |
ELECTRONIC ACCELERATION DIAGNOSTIC TROUBLE CODE REFERENCE CHART
Scheme 97
Scheme 98
Scheme 99
Scheme 100
Scheme 101
Scheme 102
PREPARATION FOR TEST (SECTION 22)
| CAUTION | To avoid damaging control modules all electrical testing should be done with a DVOM. DO NOT use an analog meter or test light to check control module circuits. |
