Faulty Signal. Permanent Fault
Faulty signal. Permanent fault
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 - Fault-tracing information
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Information
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Fault-tracing information
Fault-tracing information
Fault-tracing information
The fault tracing that follows depends on whether the software in the control module is upgraded. The control module's software version can be read out using VIDA vehicle communication.
- Ignition on.
- Read out the control module's software.
Check, using the identification of the upgraded software Engine control module (ECM)/Electronic throttle module (ETM) that the correct software is in the Electronic throttle module (ETM) and the Engine control module (ECM). Identifying upgraded software ECM/ETM Identifying Upgraded Software ECM/ETM
Select one of the following options:
1. The software is not upgraded.
2. The software is upgraded.
1 -
2 - Fault-tracing information
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Signal missing. Signal too low.
As described in the diagnostic trouble code information, the engine control module (ECM) checks that the actual throttle angle matches the desired angle. If the throttle angle does not match, diagnostic trouble code ECM-903F is stored. The diagnostic trouble code is pretty much always stored as the result of another trouble code in the engine control module (ECM). Check whether the engine control module (ECM) has stored any other diagnostic trouble codes that indicate that the electronic throttle module (ETM) has had trouble fulfilling the desired throttle angle.
If other diagnostic trouble codes have been stored that indicate a communication fault on the CAN network, it indicates that ECM-903F may have been stored due to improper functioning of the CAN network.
If ECM-901A, ECM-902A, ECM-902B, ECM-911A, ECM-912A and/or ECM-E000 are stored, fault trace these diagnostic trouble codes.
If other diagnostic trouble codes have been stored that indicate a problem with the throttle unit or its throttle regulation, it indicates that the throttle unit may have had trouble fulfilling the desired throttle angle. Any diagnostic trouble codes that are stored should be fault traced first. If ECM-914F, ECM-9150, ECM-9160, ECM-9190, ECM-91A7 and/or ECM-91B7 are stored, these diagnostic trouble codes are to be fault traced first.
If other diagnostic trouble codes have been stored that indicate a dirty throttle unit, this indicates that the throttle unit may have had trouble fulfilling the desired throttle angle. Any diagnostic trouble codes that are stored should be fault traced first. If ECM-130A is stored, fault trace this diagnostic trouble code.
If ECM-903F is stored alone without any of the above diagnostic trouble codes, use the trouble code's frozen values plus the counter to determine the operating conditions when the fault was first detected and how often the fault occurred. The values show the problem's current status and how intermittent the problem is. If the diagnostic trouble code (DTC) was stored under operating conditions that means external factors, such as low battery voltage during engine start-up, are suspected to be the cause fault-trace and remedy as necessary.
If the trouble code was stored when battery voltage was low and engine speed was close to 0 rpm when the fault occurred, it could indicate that the fault arose when the vehicle was stationary with the ignition on for a long period, thereby draining the battery, or that the fault arose due to battery voltage becoming low when the customer started the engine. This, in turn, indicates that the battery's charging status is not OK. Check the battery charge status, connections to the battery and chassis and the battery cables for contact resistance and oxidation. Remedy as necessary. Otherwise, continue as follows.
The solution to the problem may be to download the upgraded software. Adjustments that have been made in the upgraded software make the system more tolerant to brief and intermittent disruptions, which previously generated diagnostic trouble code ECM-903F.
Identifying upgraded software ECM/ETM Identifying Upgraded Software ECM/ETM
Erase the diagnostic trouble codes (DTCs). If the problem still can be recreated, despite above actions, try with a new throttle module unit.
Signal too high
Check whether the engine control module (ECM) has stored any other diagnostic trouble codes that indicate a problem with the electronic throttle module performing its work cycles. Fault trace these 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. If the diagnostic trouble code (DTC) was stored under operating conditions that means external factors, such as low battery voltage during engine start-up, are suspected to be the cause fault-trace and remedy as necessary.
If the trouble code was stored when battery voltage was low and engine speed was close to 0 rpm when the fault occurred, it could indicate that the fault arose when the vehicle was stationary with the ignition on for a long period, thereby draining the battery, or that the fault arose due to battery voltage becoming low when the customer started the engine. This, in turn, indicates that the battery's charging status is not OK. Check the battery charge status, connections to the battery and chassis and the battery cables for contact resistance and oxidation. Remedy as necessary.
The solution to the problem may be to download the upgraded software. The detection time in the upgraded software has been increased from 0.4 to 2.6 seconds, which makes it more tolerant to brief, intermittent disruptions.
Remedy as necessary.
Other information
- Identifying upgraded software ECM/ETM Identifying Upgraded Software ECM/ETM
- Information about combined diagnostic trouble codes (DTCs) Information About Combined Diagnostic Trouble Codes (DTCs)
- Checking wiring and terminals Checking Wiring and Terminals
- Fault-tracing and testing the battery Component Tests and General Diagnostics
- Throttle body (electronic throttle module (ETM)), replacing Removal and Replacement
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 - DONE
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Fault-tracing information
Signal missing. Signal too low.
Check whether the engine control module (ECM) has stored any other diagnostic trouble codes that indicate that the electronic throttle module (ETM) has had trouble fulfilling the desired throttle angle. If other diagnostic trouble codes have been stored that indicate a communication fault on the CAN network, it indicates that ECM-903F may have been stored due to improper functioning of the CAN network. If ECM-901A, ECM-902A, and/or ECM-E000 are stored, fault trace these diagnostic trouble codes.
Check whether the engine control module (ECM) has stored any other diagnostic trouble codes that indicate that the electronic throttle module (ETM) has had trouble regulating the throttle and fault trace these trouble codes. If ECM-914F, ECM-9150, ECM-9160, ECM-9190, ECM-91A7 and/or ECM-91B7 are stored, these diagnostic trouble codes are to be fault traced first.
If ECM-903F is stored alone without any of the above diagnostic trouble codes, try replacing the throttle unit.
Signal too high.
Check that Engine control module (ECM) and Electronic throttle module (ETM) are updated with the latest software.
Other information
- Identifying upgraded software ECM/ETM Identifying Upgraded Software ECM/ETM
- Information about combined diagnostic trouble codes (DTCs) Information About Combined Diagnostic Trouble Codes (DTCs)
- Throttle body (electronic throttle module (ETM)), replacing Removal and Replacement
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 deletion of diagnostic trouble codes as well as any reconfiguration, despite the problem being fixed.
Continue - DONE
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DONE - Information
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