Checking components
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 depending on the type of fault detected.
Check the brake pedal sensor resistance between #1 and #2, for resistance values see COMPONENT SPECIFICATIONS .
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.
For markets where the upgraded software, released during 2006 or later, is available, the solution may be to load the upgraded software. Since detection time has been increased from 0.16 to 2 seconds, the upgraded software will be more tolerant to short, intermittent disruptions.
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, see Connecting the breakout box .
- To access/replace the mass air flow (MAF) sensor see PEDAL SENSOR POWER BRAKE BOOSTER, REPLACING .
- With the ignition on and brake pedal sensor connector disconnected, the voltage between clutch pedal position sensor #1 and ground should be approximately 5 V.
- When the clutch pedal position sensor connector is disconnected, the brake pedal sensor #4 should be connected to ground.
- For information about signals, see ELECTRICAL SYSTEM
- 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, 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
Refer to Information