DTC Troubleshooting: P1157 (48)
  1. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 2 and ECM connector terminal C30.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between the ECM (C30) and the A/F sensor (Sensor 1), then go to Step 12 .
  1. Replace the A/F sensor (Sensor 1).
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM with the HDS.
  1. Do the ECM idle learn procedure.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1157 indicated?
YES -
Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM, then go to Step 1 . If the connector and terminal fits are OK, go to Step 18 .
NO -
Go to Step 17 .
  1. Monitor the OBD STATUS for DTC P1157 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 16 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 15 .
  1. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
  1. Start the engine, and let it idle.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1157 indicated?
YES -
If the ECM was updated, substitute a known-good ECM, then go to Step 19 . If the ECM was substituted, go to Step 1 .
NO -
Go to Step 21 .
  1. Monitor the OBD STATUS for DTC P1157 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 20 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, go to Step 1 . If the ECM was updated, substitute a known-good ECM, then go to Step 19 . If the ECM was substituted, go to Step 1 . If the screen indicates NOT COMPLETED, let the until a result comes on.