DTC Troubleshooting: P0699 (181)
DTC P0699:
 Sensor Reference Voltage C Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0699 indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FRP sensor, the MAF sensor/IAT sensor 1, the MAP sensor/IAT sensor 2, and the ECM.■
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connectors No. 1 (96P).
  1. Turn the ignition switch ON (II).
  1. Measure voltage between body ground and ECM connector No. 1 terminals No. 6, No. 7, No. 30 and ECM connector No. 2 terminal No. 14 individually.
Is there battery voltage?
YES -
Repair short to power in the wire between the ECM connector terminals and these sensors, then go to Step 16 .
  • FRP sensor and ECM connector No. 1 terminal No. 7
  • MAF sensor/IAT sensor 1 and ECM connector No. 1 terminal No. 30
  • MAP sensor/IAT sensor 2 and ECM connector No. 1 terminal No. 6
NO -
Go to Step 8 .
  1. Turn the ignition switch OFF.
  1. Disconnect the connectors from these sensors:
    • FRP sensor
    • MAF sensor/IAT sensor 1
    • MAP sensor/IAT sensor 2
  1. Connect FRP sensor 3P connector terminal No. 1 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 2 terminal No. 1 and body ground.
Is there continuity?
YES -
Repair short in the wire between the FRP sensor and ECM connector No. 2 terminals No. 1, No. 3 or No. 5, then go to Step 16 .
NO -
Go to Step 12 .
  1. Connect MAF sensor/IAT sensor 1 5P connector terminal No. 2 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 2 terminal No. 1 and body ground.
Is there continuity?
YES -
Repair short in the wire between the MAF sensor/IAT sensor 1 and ECM connector No. 2 terminals No. 1, No. 3 or No. 5, then go to Step 16 .
NO -
Go to Step 14 .
  1. Connect MAP sensor/IAT sensor 2 4P connector terminal No. 2 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 2 terminal No. 1 and body ground.
Is there continuity?
YES -
Repair short in the wire between the MAP sensor/IAT sensor 2 and ECM connector No. 2 terminals No. 1, No. 3 or No. 5, then go to Step 16 .
NO -
Go to Step 20 .
  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 P0699 indicated?
YES -
Check for poor connections or loose terminals at the FRP sensor, the MAF sensor/IAT sensor 1, the MAP sensor/IAT sensor 2, 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 P0699 indicated?
YES -
Check for poor connections or loose terminals at the FRP sensor, the MAF sensor/IAT sensor 1, the MAP sensor/IAT sensor 2, and the ECM. If the ECM was updated, substitute a known-good ECM, then recheck. If the ECM was substituted, 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.■