DTC P1031: 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 P1031 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 18 .
Disconnect the fuel heater relay. Check the fuel heater relay. Is the fuel heater relay OK?
YES | - | Go to Step 9 .
NO | - | Replace the fuel heater relay, then go to Step 18 .
Disconnect ECM connector No. 1 (96P). Disconnect the fuel heater 2P connector. Turn the ignition switch ON (II). Measure voltage between ECM connector No. 1 terminal No. 37 and body ground. Is there battery voltage?
YES | - | Repair short to power in the wire between the fuel heater relay and ECM connector No. 1 terminal No. 37, then go to Step 17 .
NO | - | Go to Step 13 .