DTC Troubleshooting: P1157 (48)
  1. Check for continuity between ECM connector terminal C29 and body ground.
Is there continuity?
YES -
Repair open in the wire between the ECM (C30) and the A/F sensor (Sensor 1), then go to Step 15 .
NO -
Repair open in the wire between the ECM (C30) and the A/F sensor (Sensor 1), then go to Step 15 .
  1. Replace the A/F sensor (Sensor 1).
  1. Reconnect all connectors and the battery.
  1. Turn the ignition switch 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 21 .
NO -
Go to Step 20 .
  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 19 , 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 18 .
  1. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
  1. Start the engine.
  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 22 . If the ECM was substituted, go to Step 1 .
NO -
Go to Step 24 .
  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 23 , 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 22 . If the ECM was substituted, go to Step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.