Honda Civic DIYs and Civic Tech ChatHonda Civic DIYs and Civic Tech Chat - for the true gearheads! Bring your wrench, it's time for some Honda Civic DIY projects! Questions about problems with your car do NOT go here.
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The Civic instrument panel contains a speedometer, tachometer (if equipped), fuel gauge, coolant temperature gauge, and warning light displays. Cross-coil type gauges, in which 2 intersecting coils are wound around a permanent magnet, are used. An electronic speedometer is used.
FUEL GAUGE TEST
FYI: In Step 3), turn ignition off before fuel gauge pointer reaches "F" mark. Failure to turn ignition off before pointer reaches "F" mark may damage fuel gauge.
1. Turn ignition switch to OFF position. Check fuse No. 15 (10-amp) in dash fuse box. Remove fuel gauge sending unit access cover in luggage compartment. Disconnect 3-pin connector from sending unit.
2. Connect voltmeter positive lead to Yellow/White wire and negative lead to Black/White wire. Turn ignition on. Voltage should be 5-8 volts. If voltage is incorrect, check for open circuit in Yellow, Yellow/White, Black and Black/White wires. Check for poor ground connection.
3. Turn ignition off. Install jumper wire between Yellow/White wire and Black/White wire. Turn ignition on. Ensure fuel gauge pointer starts to move toward "F" mark on gauge. If fuel gauge pointer does not move, replace fuel gauge. If fuel gauge is okay, check fuel gauge sending unit.
FUEL GAUGE SENDING UNIT TEST
1. Ensure ignition switch is in OFF position. Remove fuel gauge sending unit access cover in luggage compartment. Disconnect connector from fuel gauge sending unit.
2. Remove fuel gauge sending unit. Use an ohmmeter to measure resistance between fuel gauge sending unit terminals with sending unit float held at empty (down), half-full (middle) and full (up) positions and compare readings. If resistance values are incorrect, replace fuel gauge sending unit.
FUEL GAUGE SENDING UNIT RESISTANCE - FLOAT POSITION
FYI: In Step 1), turn ignition off before gauge pointer reaches "H" mark. Failure to turn ignition off before pointer reaches "H" mark may damage gauge.
1. Ensure ignition switch is in OFF position. Disconnect and ground Yellow/Green wire on coolant temperature gauge sender. Turn ignition switch to ON position. Ensure gauge pointer starts to move toward "H" mark.
2. If gauge pointer does not move, check fuse No. 15 (10-amp) in dash fuse box. Check Yellow or Yellow/Green wire for an open circuit. If fuse and wiring are okay, replace temperature gauge. If gauge is okay, test temperature gauge sending unit.
TEMPERATURE GAUGE SENDING UNIT TEST
1. Disconnect Yellow/Green wire from temperature gauge sending unit. Use an ohmmeter to measure resistance of temperature gauge sending unit with engine cold. Start engine and allow coolant temperature to rise.
2. Measure temperature gauge sending unit resistance as coolant temperature rises. If resistance values differ from specifications, replace temperature gauge sending unit.
