Fault-Tracing information
Fault-tracing information
Frozen values and counter for diagnostic trouble codes.
Use the diagnostic trouble codes' frozen values as well as the counters, to determine the driving conditions when the problem was detected the first time and how often the problem has occurred. The values show the problem's current status and how intermittent the problem is. Driving conditions may be, e.g., if the engine was running, what speed the vehicle had, or how long the driving distance was.
Counter
The counters are used to determine the problem's status. For general information about the counters, see: Counters, description Counters, Description
Counter 1 indicates the number of drive cycles without fault since the fault was last validated.
If counter 1 is the same as 0, this means that the fault has been detected in this operating cycle (permanent fault). If no troubleshooting or repair has been performed in the vehicle in this driving cycle, the problem is probably in the vehicle.
If counter 1 is over 0, this indicates that the problem has not been detected in this driving cycle (intermittent problem). The problem has existed earlier but is not active right now.
Then check counter 4. Counter 4 indicates number of driving cycles with problem since the problem was validated for the first time.
If the number of driving cycles with problems is high, this indicates an intermittent recurring problem, which means greater possibility of regenerating the problem in the workshop.
If the number of driving cycles with problems is low, this indicates an intermittent temporary problem, which means small possibility of regenerating the problem.
Hint: Counter 3 indicates number of driving cycles since first time that the problem occurred. If the value for counter 3 is divided by the value for counter 4 , the intensity of the problem is obtained. The higher the value, the higher the problem intensity. A high problem intensity indicates that the malfunction recurs often.
Counter 5 can be used for more exact determination of when the problem occurred. To compare counter 5 for diagnostic trouble codes indicates in which order the diagnostic trouble codes were stored.
5-cyl. non-turbo engines
For model year 1999, only counter 1 and 2 are available.
Frozen values
The frozen values show the driving conditions when the control module detected the problem the first time. Check using the frozen values that the diagnostic trouble code has not been caused accidentally during troubleshooting of the vehicle. If the driving distance is 0 km/miles, this indicates that the problem has occurred at the control modules' start-up of the CAN-net, when reception of a relevant value has not been possible. This also applies to other values that come via the CAN-network. In these cases, counter 5 can be used to determine when the problem was generated.
If the diagnostic trouble code has been caused during this troubleshooting, it may be due to, e.g., disconnected component, too low or high battery voltage, or that some control module has been disconnected.
If the diagnostic trouble code has been stored since before, there has likely been a problem or interference, which has resulted in the control module detecting a problem.
For general information about frozen value, see: Information Information
For information about frozen values.
- Turbo engines and 6-cyl. non-turbo engines: Description of frozen values Me7 Description of Frozen Values ME7
- 5-cyl. non-turbo engines: Frozen values DENSO, description Description of Frozen Values DENSO
Read off the diagnostic trouble code's counter and frozen values by clicking on the symbol for VCT2000. Choose diagnostic trouble code in question.
Continue - DONE
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DONE - Checking components
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Checking components
Signal missing. Permanent or intermittent fault.
Using VIDA vehicle communication, check the function of the brake light switch by reading off the parameters "Brake light switch" and "Brake pedal position". When the brake pedal is depressed, the parameter "Brake light switch" should indicate that the switch is activated when the parameter "Brake pedal position" is greater than 32.8% (1.6 V).
Diagnostic trouble code ECM-9400 will be stored in the engine control module (ECM) if the brake light switch has not closed when the brake pedal is depressed and brake pedal position is less than 32.8% (1.6 V) for longer than 0.16 seconds.
If the brake light switch and brake pedal position sensor appear to be working properly, but the the brake light switch closes at the wrong time, check the attachment of the brake light switch and the brake pedal position sensor and check that the pedal assembly seems OK.
If the brake light switch does not close when the brake pedal is depressed, check the brake light switch's cables, connectors and voltage supply (battery voltage) to brake light switch terminal #4.
When the brake pedal is depressed (switch closed), brake light switch terminal #3 and engine control module (ECM) terminal #B26 should have battery voltage.
If diagnostic trouble code ECM-9400, No signal, Intermittent fault, is stored but no fault is found, the solution could be to download the upgraded software (only for markets where upgraded software (released 2006 or later) is available). Since detection time has been increased from 0.16 to 2 seconds and the fault must be repeated during 30 consecutive brakings, the upgraded software will be much more tolerant to short, intermittent disruptions.
Note! The upgraded software has adjusted limits for the fault type No signal. The diagnostic trouble code is stored if the brake light switch is not closed when the brake pedal is depressed, brake pedal position is less than 55.9% (2.8 V) for longer than 2 seconds and this is repeated for 30 consecutive brakings.
The diagnostic trouble code can also be stored if the brake light switch is closed when the brake pedal is released. For this test an adapted brake pedal position sensor value is used, that is, the control module adapts the signal so that it always shows 0 % (0 V) at released pedal, which is different from other tests where the direct signal from the sensor is used. This parameter is not accessible in VIDA. By checking what the parameter "Brake pedal position" indicates when the pedal is released and then subtracting the value from the value indicated when the brake light switch is closed, one can estimate the size of the adapted value.
For example, if "Brake pedal position, volts" is 3.10 V when the pedal is released and 2.91 V when the brake light switch closes, the adapted value is 0.19 V (3.10-2.91) when the brake light switch closes. The diagnostic trouble code will be stored if the brake light switch is closed when the adapted value is less than 2.7% (0.14 V) for longer than 2 seconds and this is repeated for 30 consecutive brakings.
Hint: Using VIDA vehicle communication, check that the parameters "Brake pedal position, volts" and "Brake light switch" indicate correct values. To aid fault tracing, use Component specifications when measuring and checking relevant components and use Wiring diagram , Signal description and Breakout box to measure and control signals to and front the control module or its components.
Remedy as necessary
Other information:
- To connect the breakout box and access the control module, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box
- For information about signals, see Signal specification Signal Specifications
- For the resistance values, see below.
Brake pedal sensor [1][2]Braking Sensor/Switch
- Checking wiring and terminals Checking Wiring and Terminals
Caution! In order for Electronic throttle module (ETM) to reset any reconfigurations as well as delete internally stored problems, the following must be performed:
- Ignition off, wait three minutes so that the main relay / system relay releases the voltage feed to, among other, Electronic throttle module (ETM).
- Then turn on the ignition and turn it off again.
- Wait another three minutes, but if the electric cooling fan is running you have to wait another two minutes after the cooling fan has stopped, to ensure that Electronic throttle module (ETM) is shut off correctly.
If this is not done correctly, diagnostic trouble codes may remain even after deleting diagnostic trouble codes and any reconfiguration may remain, despite the problem being fixed.
Continue - Verification
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Verification
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