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6E-238 Engine Control System (4HK1) P1271 (Flash Code 24) Circuit Description • 5 volts reference circuit The engine control module (ECM) supplies 5 volts to Condition for Running the DTC • DTCs P1630, P1631 and P1632 are not set. Condition for Setting the DTC • The ECM detects that the APP sensor 1 and sensor 2 are more than 45% out of range of each Action Taken When the DTC Sets • The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. • The ECM blinks the exhaust brake indicator lamp when the diagnostic runs and fails. • The ECM inhibits exhaust brake control. Condition for Clearing the MIL / DTC • The ECM turns OFF the MIL and exhaust brake indicator lamp when the key is cycled after a • A current DTC clears when the diagnostic runs and does not fail at next driving cycle. • A history DTC clears after 20 consecutive driving cycles without a fault. Or clear with the Tech 2 or Diagnostic Aid • If an intermittent condition is suspected, refer to Intermittent Conditions in this section. DTC P1271 (Flash Code 24) Step Action Value(s) Yes No 1 Did you perform the Diagnostic System Check – — Go to Step 2 Go to Diagnostic System Check – Engine Controls 2 1. Install the Tech 2. 2. Turn OFF the ignition for 30 seconds. 3. Start the engine. 4. Monitor the Diagnostic Trouble Code (DTC) Is DTC P1277, P1278, P1282, P1283, P1631 or — Go to Applicable DTC Go to Step 3 3 1. Turn OFF the ignition for 30 seconds. 2. Start the engine. 3. Monitor the DTC Information with the Tech 2. 4. Fully depress and release the accelerator Does the DTC fail this ignition? — Go to Step 4 Go to Diagnostic Aids |