Diagnostic Manual, Chassis and Drivetrain,
Volume 1
| LOCATION: |
1.1 Base Module > 11 Diagnosis - Diagnostic Trouble Code (DTC) Memory |
Diagnosis - Diagnostic Trouble Code (DTC) Memory
 CAUTION!
On vehicles with ME-SFI (for identication see: control module box),
the base module (BM) (N16/1) is not equipped with DTC memory.
DTC's can only be retrieved by performing the Electrical Test Program
 23.
Test Preparation for DTC Readout
1. Connect impulse counter scan tool and adapter or HHT to data link connector (X11/4) as shown in section 0.
Note:
Connect yellow wire from impulse counter scan tool as follows:
Base module (BM) (N16/1) socket 8
ABS or ASR control module (N30 or N30/1) or
ASR/SPS control module (N47-1) or ESP/SPS control
module (N47-5) socket 6
SPS control module (N49/1) socket 12
ADS control module (N51) socket 11
EDS control module (N39), LH-SFI or Right LH-SFI control module (N3/1 or N3/3),ME-SFI (Engine 119) or ME-SFI (Engine 120)
right engine control module (N3/10, N3/12) socket 4
Left LH-SFI control module (N3/2) or
ME-SFI (Engine 120) left engine control
module (N3/11) socket 5
2. Ignition: ON
3. Read DTC memory (as applicable) for appropriately connected:
BM, ABS or ASR, ASR/SPS, ESP/SPS, ME-SFI, ADS, LH-SFI control modules. |
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Equipment
| Description |
|
| Hand-Held Tester (HHT) 1) |
see applicable Service Information in groups 58
and 99 |
| 1) Available through the MBUSA Standard Equipment Program. |
DTC
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Possible cause |
Test step/Remedy 1) |
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No fault in system. |
In case of complaint: 23 (entire test) |
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|
Maximum allowable temperature in module box (F23) exceeded 2). |
23 19.0 |
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|
A/C electromagnetic clutch (A9k1) jammed or poly-V-belt broken. |
23 15.0, visually inspect compressor and poly-V-belt |
 |
|
Poly-V-belt slips. |
23 15.0, check poly-V-belt tension |
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|
Engine 120: Left LH-SFI control module (N3/2) voltage supply, open circuit. |
23 4.0 |
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|
Engine 104, 119: LH-SFI control module (N3/1) voltage supply, open circuit.
Engine 120: Right LH-SFI control module (N3/3) voltage supply, open circuit. |
23 3.0 |
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|
Base module (N16/1) voltage supply output fuse F2, open circuit. |
23 6.0, 8.0 |
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Base module (N16/1) voltage supply output fuse F3, open circuit. |
23 11.0 |
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Base module (N16/1) voltage supply output fuse F1, open circuit. |
23 10.0 |
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|
Base module (N16/1) voltage supply output fuse F4, open circuit. |
23 5.0, 7.0 |
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Kickdown switch (transmission mode) (S16/7), short circuit. |
23 20.0 |
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A/C electromagnetic clutch (A9k1), short circuit. |
23 15.0 |
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Module box blower motor (M2/2), short circuit 2). |
23 19.0 |
1) Observe Preparation for Test, see 22.
2) Module box blower motor was phased out of production on model 140 starting M.Y. 1994. |
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