Checking components
Model year 1999-2001.
Check, using the diagnostic trouble code (DTC) statuses, if the fault is intermittent or permanent.
Signal too high/signal too low. Permanent fault
Depending on the type of fault the detected diagnostic trouble code indicates, check the signal cable between engine control module (ECM) terminal #B16 and brake pedal position sensor terminal #1 for open circuit, short circuit to supply voltage or short circuit to ground. Check the ground cable between engine control module (ECM) terminal #B4 and brake pedal position sensor terminal #2 for open circuit, short circuit to supply voltage or short circuit to ground.
Check resistance between the connections for brake pedal position sensor terminals #1 and #2. Fault trace and remedy as necessary.
Signal too high/signal too low. 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. This information can facilitate searching for an intermittent fault. If for example the trouble code was stored when battery voltage was low and engine speed was equal to 0 rpm, 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 when the customer was attempting to start the vehicle.
Faulty signal. Permanent or intermittent fault.
For markets where the upgraded software, released during 2006 or later, is available, the solution may be to load the upgraded software. It is no longer necessary to store a diagnostic trouble code for this type of fault. Thus, this fault type has been disabled in the upgraded software.
For other markets, check the brake pedal position sensor's attachment, cables and connectors for contact resistance and oxidation. Check that the brake pedal position sensor has the right resistance.
HINT: Using VIDA vehicle communication, check that the parameters "Brake pedal position (%)" and "Brake pedal position sensor (V)" 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.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. Since detection time has been increased from 0.32 to 10 seconds, the upgraded software will be more tolerant to short, intermittent disruptions.
Model year 2002.
ECM-9400 is only stored if the engine control module (ECM) does not receive brake pedal position information from the brake control module (BCM) via the CAN network or the brake control module (BCM) has detected a fault in the brake pedal position sensor. Check whether the brake control module (BCM) has stored any diagnostic trouble codes that indicate a fault in the brake pedal position sensor. Any diagnostic trouble codes that are stored should be fault traced first.
If the brake control module (BCM) does not contain any diagnostic trouble codes indicating a faulty brake pedal position sensor, the trouble code was generated because there was a time period when the engine control module (ECM) did not receive any brake pedal position information from the brake control module (BCM). It is most likely due to some type of disturbance on the CAN network. The engine control module (ECM) has probably stored diagnostic trouble codes that indicate CAN communication problems. Fault trace these diagnostic trouble codes.
For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. If the brake control module (BCM) has detected a fault, it will not help to download new software to the engine control module (ECM). If the diagnostic trouble code was caused by a CAN problem, the upgraded software will be much more tolerant to short, intermittent disruptions since the detection time has been increased from 0.5 to 10 seconds.
Remedy as necessary.
Other information:
- For information about signals, see Signal specification .
- With the ignition on and the brake pedal sensor connector disconnected, the voltage between clutch pedal position sensor #2 and ground should be approximately 5 V.
- With the brake pedal sensor connector disconnected, brake pedal sensor #4 (engine control module side) should be connected to ground.
- For the resistance values, see below.
- See Identifying upgraded software ECM/ETM
- See 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.
Refer to Information