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Home >> Volvo >> 2000 >> C70 Convertible L5-2.3L Turbo VIN 53 B5234T3 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> ECM Codes (Engine Control Module) >> ECM-9540 >> Accelerator Pedal (AP) Sensor Power Supply. Signal Too Low. Permanent Fault >> Level Too Low

Level Too Low






Level too low






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
Check, using the diagnostic trouble code (DTC) statuses, if the fault is intermittent or permanent.

Signal too high. Permanent fault
Check the cable between engine control module (ECM) terminal #B9 and accelerator pedal position sensor terminal #6 for short circuit to supply voltage.

Signal too low. Permanent fault
Check the cable between engine control module (ECM) terminal #B9 and accelerator pedal position sensor terminal #6 for short circuit to ground.

Intermittent fault
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. The operating conditions can be, for example, whether the engine was running, what the speed of the vehicle was and what the battery voltage in the system was. This information can facilitate searching for an intermittent fault. If the fault was stored at a battery voltage lower than 10 V with engine speed at 0 rpm, this indicates that the fault may have occurred when the engine was started. This, in turn, indicates that the battery's charging status is not OK.
- Check the battery status.

Hint: Check, using VIDA vehicle communication, that the parameter "Accelerator pedal, PWM (%)" shows the 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.

For markets where the upgraded software, released during 2006 or later, is available, the solution may be to load the upgraded software. As the detection time has increased from 0.1 to 0.4 seconds, the upgraded software becomes more tolerant towards short intermittent interference among other things.
Remedy as necessary.

Other information
- To connect the breakout box, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- To access/replace the accelerator pedal (AP) position sensor, see Replacing the accelerator pedal module Service and Repair.
- For information about signals on 5-cyl, see Signal specification Signal Specifications.
- For information about signals on 6-cyl, see Signal specification Signal Specifications.
- 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. If the electric cooling fan is running, you have to wait another two minutes after the electric cooling fan has stopped, to make sure that Electronic throttle module (ETM) has been 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 - Fault-tracing information
DONE

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Fault-tracing information

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