Component Location
General Description
Brake switch monitors malfunction of accel pedal sensor(APS).
Drivers depress brake pedal when 1).the voltage higher than driver’s intension is detected due to APS malfunction(signal circuit short to high voltage) 2).engine power generates excessively due to fault signal.
Like previous example, if driver’s intension to decelerate is transmitted to ECM(brake pedal depressed) when APS signal is high, ECM consider APS to be fault and Limp Home mode is activated.
When Limp Home mode is activated, engine speed is fixed at 1200RPM and driving performance is limited, later, if correct APS signal is detected, Limp Home mode is deactivated immediately.
DTC Description
P2299 is set when brake signal is inputted to ECM for more than 0.5 sec. while APS is depressed more than 5% at below 770RPM and 4Km/h. And Limp Home mode is activated with the DTC code occurence. Later, if correct APS signal is detected, Limp Home mode is deactivated immediately. This code is set when APS signal is a bit higher than the voltage at accelerator released position and driver’s pedal manipulation, therefore careful inspection of APS and checking driver’s pedal depressing habit is required.
DTC Detecting Condition
Item | Detecting Condition | Possible Cause |
DTC Strategy | ? Voltage monitoring | ? APS 1 Circuit ? APS 2 Circuit ? APS component |
Enable Conditions | ? Engine running ( engine speed below 770RPM, vehicle speed below 4Km/h) |
Threshold Value | ? Brake pedal singal inputted at APS output voltage above 5%(Error disappears when brake pedal released or accelerator pedal depressed 200% per sec.) |
Diagnostic Time | ? 0.5 sec. |
Fail Safe | Fuel Cut | NO | ? APS standard value is 0%. ? Limp home idle is fixed at (1200RPM) ? A/C operation stops according to Vehicle/Engine speed ? Cruise control deactivated (for Cruise control option applied vehicle) |
EGR Off | NO |
Fuel Limit | YES |
Check Lamp | NO |
Specification
| Pedal released | Pedal depressed | Sensor Type |
APS 1 | 0.7V~0.8V | 3.8V~4.4V | Variable resistance type(Potentiometer) |
APS 2 | 0.275V~0.475V | 1.75V~2.35V |
Schematic Diagram
Signal Waveform
APS 2 Ground checking signal is for ECM to monitor APS 2. This signal drops APS 2 output voltage to below 200.39mV per 200msec. If APS 2 output voltage does not drop to below 200.39mV, ECM sets DTC as recognizing ground circuit error of APS 2 .
? The waveform below 200.39mV is not detectable in Ground checking signal waveform of APS 2 signal. Instead, the waveform which drops a little is detected. If APS 2 data of "SERVICE DATA" on the Scantool varies from 350mV to 0mV periodically, it means it works well.