DTC Troubleshooting: P2127 (37)
DTC P2127:
 APP Sensor B Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Check APP SENSOR B in the DATA LIST with the HDS.
Is there about 0.097 V or less?
YES -
Go to Step 3 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor B and the ECM.■
  1. Turn the ignition switch OFF.
  1. Disconnect the APP sensor 6P connector.
  1. Turn the ignition switch ON (II).
  1. Measure voltage between APP sensor 6P connector terminals No. 5 and No. 6.
Is there about 5 V?
YES -
Go to Step 7 .
NO -
Go to Step 15 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 2 (58P).
  1. Check for continuity between APP sensor 6P connector terminal No. 4 and body ground.
Is there continuity?
YES -
Repair short in the wire between APP sensor B and ECM connector No. 2 terminal No. 22, then go to Step 20 .■
NO -
Go to Step 10 .■
  1. Check for continuity between ECM connector No. 2 terminal No. 9 and APP sensor 6P connector terminal No. 4.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between APP sensor B and ECM connector No. 2 terminal No. 9, then go to Step 20 .
  1. Reconnect ECM connector No. 2 (58P).
  1. Connect APP sensor 6P connector terminals No. 4 and No. 6 with a jumper wire.
  1. Turn the ignition switch ON (II).
  1. Check APP SENSOR B in the DATA LIST with the HDS.
Is there about 0.097 V or less?
YES -
Go to Step 24 .
NO -
Go to Step 18 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 2 (58P).
  1. Check for continuity between ECM connector No. 2 terminal No. 15 and APP sensor 6P connector terminal No. 6.
Is there continuity?
YES -
Go to Step 24 .
NO -
Repair open in the wire between APP sensor B and ECM connector No. 2 terminal No. 15, then go to Step 20 .
  1. Turn the ignition switch OFF.
  1. Reconnect all connectors.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2127 indicated?
YES -
Check for poor connections or loose terminals at APP sensor B and the ECM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2127 indicated?
YES -
Check for poor connections or loose terminals at APP sensor B and the ECM, then go to Step 1 .
NO -
If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■