DTC Troubleshooting: P1030 (183-1)

DTC P1030: Fuel Heater Circuit Malfunction Turn the ignition switch ON (II). Clear the DTC with the HDS. Do the FUEL HEATER ON/OFF in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1030 indicated?
YES | - | Go to Step 5 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the fuel heater relay and the ECM.■
Turn the ignition switch OFF. Check No. 2 (7.5 A) fuse in the multi fuse/relay box. Is the fuse OK?
YES | - | Go to Step 7 .
NO | - | Replace No. 2 (7.5 A) fuse, then go to Step 15 .
Check No. 11 +B PTC (FUEL HEATER) (30 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 the No. 11 +B PTC (FUEL HEATER) (30 A) fuse and the fuel heater relay. Also replace the No. 11 +B PTC (FUEL HEATER) (30 A) fuse, then go to Step 15 . Repair short in the wire between the fuel heater relay and the No. 2 (7.5 A) fuse in the multi fuse/relay box, then go to Step 15 .
Remove the left front inner fender. Open the relay holder (A), and disconnect the fuel heater relay. Check the fuel heater relay. Is the fuel heater relay OK?
YES | - | Go to Step 10 .
NO | - | Replace the fuel heater relay, then go to Step 14 .

Measure voltage between fuel heater relay 4P connector terminal No. 2 and body ground. Is there battery voltage?
YES | - | Go to Step 11 .
NO | - | Repair open in the wire between the No. 11 +B PTC (FUEL HEATER) (30 A) fuse and the fuel heater relay, then go to Step 14 .
Disconnect the fuel heater 2P connector. Disconnect ECM connector No. 1 (96P). |

Check for continuity between ECM connector No. 1 terminal No. 37 and body ground. Is there continuity?
YES | - | Repair short in the wire between the No. 2 (7.5 A) fuse and ECM connector No. 1 terminal No. 37. Also replace the No. 2 (7.5 A) fuse in the multi fuse/relay box, then go to Step 14 .
NO | - | Go to Step 19 .
Reconnect all connectors. Turn the ignition switch ON (II). Reset the ECM with the HDS. Do the FUEL HEATER ON/OFF in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P1030 is indicated, check for poor connections or loose terminals at the fuel heater relay 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.■
Update the ECM if it does not have the latest software, or substitute a known-good ECM. Do the FUEL HEATER ON/OFF in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P1030 is indicated, check for poor connections or loose terminals at the fuel heater relay 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. ■