If the difference between real and target throttle position is abnormal, the PCM sets DTC P0638.
Item | Detecting Condition | Possible cause | |
Case 1 | DTC Strategy |
•
Return Spring Check | 1. Throttle stuck 2. Open in motor circuit 3. Faulty motor 4. Faulty PCM |
Enable Conditions |
•
During TPS adaptation | ||
Threshold Value |
•
Throttle position greater than Limp-home pos.+3 % | ||
Diagnostic Time |
•
0.56 sec. | ||
MIL ON Condition |
•
1 driving cycle | ||
Item | Detecting Condition | Possible cause | |
Case 2 | DTC Strategy |
•
Abnormal value of TPS re-adaptation | 1. Throttle stuck 2. Open in motor circuit 3. Faulty motor 4. Faulty PCM |
Enable Conditions |
•
During TPS adaptation (throttle is made to approach the lower mech. throttle limit stop via ramp) Learned value already saved | ||
Threshold Value |
•
Voltage throttle poti 1 at the lower limit stop less than 0.21 V or Voltage throttle poti 2 at the lower limit stop greater than 4.84 V or Volt. sum throttle poti1 and 2 = 5V | ||
Diagnostic Time |
•
0.3 sec. | ||
MIL ON Condition |
•
1 driving cycle | ||
Case 3 | DTC Strategy |
•
Abnormal value of TPS re-adaptation | |
Enable Conditions |
•
Delta Limphome(last dcy adaptation - current dcy adaptation) or ETC replaced or ECU reset | ||
Threshold Value |
•
Voltage throttle poti 1 at the lower limit stop + offset greater than 0.695 V
•
Voltage throttle poti 2 at the lower limit stop - offset(0.025 V) less than 4.305 V | ||
Diagnostic Time |
•
0.3 sec. | ||
MIL ON Condition |
•
1 driving cycle | ||
Item | Detecting Condition | Possible cause | |
Case 4 | DTC Strategy |
•
TPS re-adapation was failed due to violated input conditions | 1. Throttle stuck 2. Open in motor circuit 3. Faulty motor 4. Faulty PCM |
Enable Conditions |
•
During TPS adaptation | ||
Threshold Value |
•
Engine speed greater than 250 rpm
•
Vehicle speed greater than 0 mph
•
Accel. pedal greater than 14.9 %
•
ECT less than 5.3 ℃(41.54 °F)
•
ECT greater than 100.5 ℃(212.9 °F)
•
IAT less than 5.3 ℃(41.54 °F) | ||
Diagnostic Time |
•
Immediate | ||
MIL ON Condition |
•
2 driving cycles | ||
Case 5 | DTC Strategy |
•
TPS re-adapation was failed due to violated input conditions | |
Enable Conditions |
•
During TPS adaptation | ||
Threshold Value |
•
Engine speed greater than 250 rpm
•
Vehicle speed greater than 0 mph
•
Accel. pedal greater than 14.9 %
•
ECT less than 5.3 ℃(41.54 °F)
•
ECT greater than 100.5 ℃(212.9 °F)
•
IAT less than 5.3 ℃(41.54 °F) | ||
Diagnostic Time |
•
Immediate | ||
MIL ON Condition |
•
1 driving cycle | ||
Item | Detecting Condition | Possible cause | |
Case 6 | DTC Strategy |
•
TPS adaptation fault or abnormal value during the first initialization | 1. Throttle stuck 2. Open in motor circuit 3. Faulty motor 4. Faulty PCM |
Enable Conditions |
•
First initialization
•
IG ON | ||
Threshold Value |
•
Learning stop due to violated input condition and UMA learning error | ||
Diagnostic Time |
•
Immediate | ||
MIL ON Condition |
•
1 driving cycle | ||
Case 7 | DTC Strategy |
•
Limp-home check | |
Enable Conditions |
•
IG ON | ||
Threshold Value |
•
Learning stop due to violated input condition and UMA learning error | ||
Diagnostic Time |
•
Immediate | ||
MIL ON Condition |
•
2 driving cycle | ||
