DTC Troubleshooting: P0045 (172-5)

DTC P0045: Turbocharger Boost Control Solenoid Circuit Open

1. Turn the ignition switch ON (II).

1. Clear the DTC with the HDS.

1. Start the engine, and hold the engine speed at 2,000 rpm (min −1 ) without load.

1. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0045 indicated?

YES | - | Go to Step 5 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the turbocharger boost control solenoid valve and the ECM.■

1. Check for Temporary DTCs or DTCs with the HDS.

Are DTC P0045, P0403 and P2008 indicated at same time?

YES | - | Go to Step 6 .
NO | - | Go to Step 11 .

1. Turn the ignition switch OFF.

1. Check No. 10 IGP2 (20 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES | - | Go to Step 8 .
NO | - |

- Repair short in the wire between No. 10 IGP2 (20 A) fuse and PGM-FI main relay 2, then go to Step 22 .
- Repair short in the wire between PGM-FI main relay 2 and the EGR valve, the IMRC solenoid valve, turbocharger boost control solenoid valve, then go to Step 22 .

1. Check PGM-FI main relay 2.

Is PGM-FI main relay 2 OK?

YES | - | Go to Step 9 .
NO | - | Replace fuel heater relay 2, then go to Step 21 .

1. Disconnect PGM-FI main relay 2.

1. Measure voltage between PGM-FI main relay 2 4P connector terminal No. 1 and body ground.

Is there battery voltage?

YES | - | Repair open in the wire between PGM-FI main relay 2 and the EGR valve, the IMRC solenoid valve, turbocharger boost control solenoid valve, then go to Step 22 .
NO | - | Repair open in the wire between No. 10 IGP2 (20 A) fuse in the under-hood fuse/relay box and PGM-FI main relay 2, then go to Step 22 .

1. Turn the ignition switch OFF.

1. Disconnect the turbocharger boost control solenoid valve 2P connector.

1. Turn the ignition switch ON (II).

1. Measure voltage between turbocharger boost control solenoid valve 2P connector terminal No. 1 and body ground.

Is there battery voltage?

YES | - | Go to Step 15 .
NO | - | Repair open in the wire between PGM-FI main relay 2 and the turbocharger boost control solenoid valve, then go to Step 22 .

1. At solenoid side, measure resistance between turbocharger boost control solenoid valve 2P connector terminals No. 1 and No. 2.

Is there about 10−14 Ω at 20 °C (68 °F)?

YES | - | Go to Step 16 .
NO | - | Go to Step 20 .

1. Turn the ignition switch OFF, and wait 30 seconds.

1. Connect turbocharger boost control solenoid valve 2P connector terminal No. 2 to body ground with a jumper wire.

1. Disconnect ECM connector No. 1 (96P).

1. Check for continuity between ECM connector No. 1 terminal No. 78 and body ground.

Is there continuity?

YES | - | Go to Step 27 .
NO | - | Repair open in the wire between the turbocharger boost control solenoid valve and ECM connector No. 1 terminal No. 78, then go to Step 22 .

1. Turn the ignition switch OFF.

1. Replace the turbocharger boost control solenoid valve.

1. Reconnect all connectors.

1. Turn the ignition switch ON (II).

1. Reset the ECM with the HDS.

1. Start the engine, and hold the engine speed at 2,000 rpm (min −1 ) without load.

1. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P0045 is indicated, check for poor connections or loose terminals at the turbocharger boost control solenoid valve and the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Troubleshooting is complete.■

1. Update the ECM if it does not have the latest software, or substitute a known-good ECM.

1. Start the engine, and hold the engine speed at 2,000 rpm (min −1 ) without load.

1. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P0045 is indicated, check for poor connections or loose terminals at the turbocharger boost control solenoid valve and the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. ■