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ECK-376 < DTC/CIRCUIT DIAGNOSIS > [K9K] P2688 FUEL HEATER Is the inspection result normal? YES >> GO TO 3. NO >> Perform the trouble diagnosis for power supply circuit. 3. CHECK FUEL HEATER RELAY CIRCUIT-1 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check the continuity between fuel heater relay harness connector and ECM harness connector. 4. Also check harness for short to ground and to power. Is the inspection result normal? YES >> GO TO 4. NO >> Repair or replace error-detected parts. 4. CHECK FUEL HEATER RELAY CIRCUIT-2 1. Disconnect fuel heater and water level sensor harness connector. 2. Check the continuity between fuel heater and water level sensor harness connector and fuel heater relay 3. Also check harness for short to ground and to power. Is the inspection result normal? YES >> GO TO 5. NO >> Repair or replace error-detected parts. 5. CHECK FUEL HEATER RELAY Check the fuel heater relay. Refer to ECK-377, "Component Inspection (Fuel Heater Relay)" Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-41, "Intermittent Incident" . NO >> Replace error-detected parts. Component Inspection (Fuel Heater Relay) INFOID:0000000010290053 1. CHECK FUEL HEATER RELAY 1. Turn ignition switch OFF. 2. Remove fuel heater relay. 3. Check continuity between fuel heater relay terminals as per the + − Continuity Fuel heater relay ECM Connector Terminal Connector Terminal F164 2 F80 95 Existed + − Continuity Fuel heater and water level sensor Fuel heater relay Connector Terminal Connector Terminal F191 5 F164 5 Existed Fuel heater relay Condition Continuity + − Terminal 3 5 12 V direct current supply Existed No current supply Not existed JSBIA0671ZZ |