DTC Troubleshooting: P0301 (71), P0302 (72), P0303 (73), P0304 (74)
  1. At the injector side, measure the resistance between injector 2P connector terminals No. 1 and No. 2.
Is there 10−13 Ω?
YES -
Go to Step 50 .
NO -
Replace the injector, then go to Step 40 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect all connectors, and install the parts in the reverse order of removal.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM with the HDS.
  1. Clear the CKP pattern with the HDS.
  1. Do the ECM idle learn procedure.
  1. Do the CKP pattern learn procedure.
  1. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0301, P0302, P0303, or P0304 indicated?
YES -
Check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM, then go to the troubleshooting DTC P0300, P0301, P0302, P0303, or P0304.
NO -
Go to Step 49 .
  1. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 48 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM, then go to Step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to Step 47 .
  1. Reconnect all connectors.
  1. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
  1. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • REL TP SENSOR
    • CLV (calculated load value)
    • APP SENSOR
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0301, P0302, P0303, or P0304 indicated?
YES -
Check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM. If the ECM was updated, substitute a known-good ECM, then go to Step 52 . If the ECM was substituted, go to Step 1 .
NO -
Go to Step 54 .
  1. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs were indicated in Step 53 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM. If the ECM was updated, substitute a known-good ECM, then go to Step 52 . If the ECM was substituted, go to Step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to Step 52 .