Trouble Code Table
| Trouble Codes | Information Sensor | Cause of Fault |
|---|---|---|
| 13 | Oxygen sensor | No voltage change |
| 14 | Coolant temperature sensor | Voltage low |
| 15 | Coolant temperature sensor | Voltage high |
| 16 | Knock sensor | |
| 18 | Knock control system | |
| 19 | Inductive pulse pick-up | Incorrect engine speed signal |
| 21 | Throttle valve potentiometer | Voltage high |
| 22 | Throttle valve potentiometer | Voltage low |
| 24 | Odometer frequency sensor | No speed signal |
| 25 | Injection valve | Voltage low |
| 29 | Fuel pump relay | Voltage low |
| 32 | Fuel pump relay | Voltage high |
| 33 | Intake manifold absolute pressure sensor | Voltage high |
| 34 | Intake manifold absolute pressure sensor | Voltage low |
| 35 | Idle speed stepper motor | Incorrect engine speed |
| 41 | EST B lead (2/3) | Voltage high |
| 42 | EST A lead (1/4) | Voltage high |
| 43 | L-EGR system |
Trouble Code Table (continued)
| Trouble Codes | Information Sensor | Cause of Fault |
|---|---|---|
| 44 | Oxygen sensor | Exhaust gas lean |
| 45 | Oxygen sensor | Exhaust gas rich |
| 47 | L-EGR valve position | |
| 49 | Battery | Voltage high |
| 51 | Program memory | Program memory defective |
| 55 | EEPROM or control unit | |
| 62 | Evaporation control system | |
| 63 | EST B lead (2/3) | Voltage low |
| 64 | EST A lead (1/4) | Voltage low |
| 69 | Intake air temperature sensor | Voltage low |
| 71 | Intake air temperature sensor | Voltage high |
| 81 | Injection valve | Voltage high |
| 93 | Quad driver module | Carry out quad driver actuator test |
Note:
The terms information sensor and cause of fault in the trouble code table provide only one indication to the cause of the fault, i.e. when a trouble code is indicated, the component indicated in the trouble code table must not necessarily be defective. Connecting leads, plug connections and the voltage supply must also be included in the trouble-shooting.
Blink Code Readout for Trouble Codes without TECH
It is also possible to read out trouble codes from the control unit data stream using Diagnostic Switch KM-640.
For this, the diagnostic switch is turned to position "B" and connected to the diagnostic plug.
When the ignition is switched on, the trouble codes will be flashed out via the engine telltale.
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|---|---|---|---|
| .P. D1460.tif | 9 | 7,5 | tiff;; |
Engine Telltale
If TECH 1 is connected to the diagnostic plug, the engine telltale is activated to indicate that the system is in the diagnostic mode. If, however, Diagnostic Switch KM-640 is used, the engine telltale is the determining factor for blink code readout.
If the engine telltale is activated while travelling, a fault has been recognized and stored. The system's emergency program guarantees that the vehicle, if driven carefully, will reach the next Service workshop.
Diagnosis with TECH 1
If communication between the Multec control unit and TECH 1 via the diagnostic plug has been enabled, a series of diagnosis and trouble-shooting options for trouble code readout and data list parameter comparison are available. In addition, various system components can be activated with the Actuator Test and checked for correct functioning:
- Quad driver
- DIS module
- Injection valve
- Idle speed stepper motor
- Controlled canister purge valve
- Fuel pump relay
| System Components | Procedure and Test Condition |
|---|---|
| Quad driver | The three outputs are checked separately |
| DIS module | EST A and EST B are checked individually. |
The checking spark plugs are actuated at 2 Hz for approx. 30 s.
| Injection valve | The injection valve is actuated at 10 Hz for approx. 30 s |
|---|---|
| Idle speed stepper motor | The idle speed stepper motor is activated and transports the valve taper in and out by 160 steps in each case. |
| Controlled canister purge valve | The controlled canister purge valve is actuated at 1 Hz for approx. 30 s. |
| Fuel pump relay | The fuel pump relay is switched on and off by the control unit via TECH 1 once per second. |
Snapshot
To be able to find the cause of temporarily occurring faults, the snapshot mode is available on TECH 1.
The data determined can be entered in the table on the next page for simplified snapshot evaluation.
The following procedure should be followed:
- The TECH 1 setting (setup) for recording snapshots must be fulfilled.
- The vehicle is tested at idle speed or during a test drive.
- Start data recording, either automatically when a fault code occurs or manually by pressing key "F9" when the fault occurs.
- Continue until the end of snapshot recording.
- Then identify the "0 position", or time at which the fault starts.
- Enter the values around the selected time in the table.
- This easy-to-understand form allows simplified interpretation f the data.
This makes clear the relationship between cause and effect.
Snapshot Table
| No. | Data List Parameter | SNAPSHOT DATA | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| - | -8 | -7 | -6 | -5 | -4 | -3 | -2 | -1 | 0 | +1 | +2 | +3 | - | ||
| 01 | BATTERY VOLTAGE | ||||||||||||||
| 02 | RON CODING | ||||||||||||||
| 03 | COOLANT TEMP | ||||||||||||||
| 04 | INTAKE AIR TEMP. | ||||||||||||||
| 05 | MAP SENSOR | ||||||||||||||
| 06 | TPS SIGNAL | ||||||||||||||
| 07 | DIAG. REQUEST | ||||||||||||||
| 08 | FUEL PUMP RELAY | ||||||||||||||
| 09 | PARK/NEUTRAL SW. | ||||||||||||||
| 10 | TORQUE CONTROL | ||||||||||||||
| 11 | VEHICLE SP.PULSE | ||||||||||||||
| 12 | VEHICLE SPEED | ||||||||||||||
| 13 | DESIRED IDLE | ||||||||||||||
| 14 | ENGINE SPEED | ||||||||||||||
| 15 | IDLE AIR CONTROL | ||||||||||||||
| 16 | SPARK ADVANCE | ||||||||||||||
| 17 | O2 SENSOR LOOP | ||||||||||||||
| 18 | O2 SENSOR | ||||||||||||||
| 19 | O2 INTEGRATOR | ||||||||||||||
| 20 | O2 BLM ENABLE | ||||||||||||||
| 21 | O2 BLM CELL NO. | ||||||||||||||
| 22 | O2 BLM CELL CONT | ||||||||||||||
| 23 | AIR/FUEL RATIO | ||||||||||||||
| 24 | INJECTION PULSE | ||||||||||||||
| 25 | CLEAR FLOOD MODE | ||||||||||||||
| 26 | DEC. FUEL CUTOFF | ||||||||||||||
| 27 | POWER ENRICHMENT | ||||||||||||||
| 28 | LEGR ACTUAL VALUE | ||||||||||||||
| 29 | LEGR NOMINAL VALUE | ||||||||||||||
| 30 | KNOCK VOLTAGE | ||||||||||||||
| 31 | KNOCK CONTROL | ||||||||||||||
| 32 | KNOCK SIGNAL RECEIVED |
Alteration of Idle Speed using TECH 1
Adjustment of the idle speed using TECH 1 for the X 12 SZ engine, like increasing the control engine speed in NZ engines, can be carried out in mode F7. Simply pressing the key adapts the engine speed in small steps within the limits permitted by the ABE (General Operating Permit). This value remains stored after TECH 1 has been disconnected.
Quad Driver Test
Memory capacity means that only limited amounts of information are available for the snapshot block. This means that an isolated fault can be displayed, but that several faults must always be indicated by trouble code 93. In this case, the mechanic must check all quad outputs individually to identify the faulty circuit.
Thus, for trouble code 93 "quad driver", four components may be defective:
1. Linear exhaust gas recirculation valve (L-EGR) 3. Engine telltale
2. Controlled canister purge valve (CCP) 4. Torque control
(X 16 SZ only)
Quad driver fault
1. Linear exhaust gas recirculation valve, short circuit to ground or lead interrupted
1. Linear exhaust gas recirculation valve, short circuit to battery voltage
2. Controlled canister purge valve, short circuit to ground or lead interrupted
2. Controlled canister purge valve, short circuit to battery voltage
3. Engine telltale, short circuit to ground or lead interrupted
3. Engine telltale, short circuit to battery voltage
For further trouble-shooting, a TECH 1 Actuator Test "Quad Driver Module" can be selected.
After completion of this test, TECH 1 displays the detected faults.
Important:
These trouble codes do not appear in TECH 1 mode F2!