DTC Troubleshooting: 44

DTC 44: Cal FL Brake Fluid Pressure Sensor Circuit Open/Short Turn the ignition switch ON (II). Clear the DTCs with the HDS. Watch the adaptive cruise control (ACC) indicator. Does the adaptive cruise control (ACC) indicator stay off?
YES | - | Intermittent failure. The system is OK at this time. Check for loose or poor connections.■
NO | - | Go to Step 4 .
Check for DTCs with the HDS. Is DTC 44 indicated?
YES | - | Go to Step 5 .
NO | - | Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.■
Check the left front brake fluid pressure voltage (VPRFL) with the HDS. Is there about 0.5 V?
YES | - | Go to Step 6 .
NO | - | Go to Step 9 .
Do the brake booster test. Press the brake pedal with about 314 N (32 kgf, 70.6 lbf) pressure. Check the left front brake fluid pressure voltage (VPRFL) with the HDS. Is there about 2.5 V?
YES | - | The left front brake fluid pressure signal is OK, check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit. ■
NO | - | Go to Step 9 .
Turn the ignition switch OFF. Disconnect the 20P connector from the adaptive cruise control (ACC) unit. Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 5 terminal and body ground. Is there continuity?
YES | - | Repair a short to ground in the wire between the adaptive cruise control (ACC) unit and the left front pressure sensor.■
NO | - | Go to Step 12 .
Disconnect the 3P connector from the left front pressure sensor. |

Connect the left front pressure sensor 3P connector No. 2 terminal to body ground with a jumper wire. |

Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 5 terminal and body ground. Is there continuity?
YES | - | Go to Step 15 .
NO | - | Repair an open in the wire between the adaptive cruise control (ACC) unit and the left front pressure sensor.■
Remove the jumper wire from the left front pressure sensor. Reconnect all connectors. Turn the ignition switch ON (II). |

Check for voltage between the adaptive cruise control (ACC) unit 20P connector No. 3 and No. 5 terminals. Is there about 5V?
YES | - | Go to Step 19 .
NO | - | Check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit. ■
Turn the ignition switch OFF. Disconnect the 20P connector from the adaptive cruise control (ACC) unit. |

Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 14 terminal and body ground. Is there continuity?
YES | - | Repair a short to ground in the wire between the adaptive cruise control (ACC) unit and the left front pressure sensor.■
NO | - | Go to Step 22 .
Disconnect the 3P connector from the left front pressure sensor. |

Connect the left front pressure sensor 3P connector No. 3 terminal to body ground with a jumper wire. |

Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 14 terminal and body ground. Is there continuity?
YES | - | Go to Step 25 .
NO | - | Repair an open in the wire between the adaptive cruise control (ACC) unit and the left front pressure sensor.■

Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 5 terminal and body ground. Is there continuity?
YES | - | Repair a short in the wire between the PRESS FL line and VCC line.■
NO | - | Go to Step 26 .

Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 3 terminal and body ground. Is there continuity?
YES | - | Go to Step 27 .
NO | - | Repair an open in the wire between the adaptive cruise control (ACC) unit and the left front pressure sensor.■
Remove the jumper wire from the left front pressure sensor. Reconnect all connectors. Turn the ignition switch ON (II). |

Check for voltage between the adaptive cruise control (ACC) unit 20P connector No. 3 and No. 14 terminals. Is there about 0.5V?
YES | - | Go to Step 31 .
NO | - | Replace the left front pressure sensor.■
Clear the DTCs with the HDS. Watch the adaptive cruise control (ACC) indicator. Does the adaptive cruise control (ACC) indicator stay off?
YES | - | Intermittent failure. The system is OK at this time. Check for loose or poor connections.■
NO | - | Go to Step 33 .
Check for DTCs with the HDS. Is DTC 44 indicated?
YES | - | Check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit. ■
NO | - | Troubleshoot the indicated DTC(s). If there are no DTCs, the system is OK at this time.■