DTC Troubleshooting: P1059 (179-7)

DTC P1059: Fuel Rail Pressure Control Valve Circuit Open

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 P1059 indicated?

YES | - | Go to Step 4 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the fuel pressure control valve and the ECM.■

1. Turn the ignition switch OFF.

1. Disconnect the fuel pressure control valve 2P connector.

1. Turn the ignition switch ON (II).

1. Measure voltage between fuel pressure control valve 2P connector terminal No. 2 and body ground.

Is there battery voltage?

YES | - | Go to Step 8 .
NO | - | Repair open in the wire between PGM-FI main relay 1 and the fuel pressure control valve, then go to Step 15 .

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

Is there about 3.5 Ω at room temperature?

YES | - | Go to Step 9 .
NO | - | Go to Step 13 .

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

1. Reconnect the fuel pressure control valve 2P connector.

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

1. Measure voltage between ECM connector No. 1 terminal No. 79 and body ground.

Is there battery voltage?

YES | - | Go to Step 19 .
NO | - | Repair open in the wire between the fuel pressure control valve and ECM connector No. 1 terminal No. 79, then go to Step 15 .

1. Turn the ignition switch OFF.

1. Replace the fuel supply pump assembly.

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.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P1059 is indicated, check for poor connections or loose terminals at the fuel pressure control 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. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P1059 is indicated, check for poor connections or loose terminals at the fuel pressure control 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. ■