Honda Civic. Manual — part 704

4. Check for DTCs with the HDS.

Is DTC B1175 indicated ?

YES - Go to step 5.

NO - Intermittent failure, the fuel level sensor circuit is OK at this time. Check
for loose or poor connections.

5. Turn the ignition switch OFF.
6. Disconnect the fuel tank unit 5P connector and the gauge control module (tach)

36P connector.

7. Connect the fuel tank unit 4P connector No. 1 and No. 3 terminals and body

ground with jumper wires.

Fig. 16: Connecting Fuel Tank Unit 4P Connector No. 1 And No. 3
Terminals And Body Ground With Jumper Wires

8. Check for continuity between gauge control module (tach) 36P connector No.

32 and No. 33 terminals and body ground individually.

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Gauges - Civic (All Except Hybrid)

Fig. 17: Checking Continuity Between Gauge Control Module (Tach) 36P
Connector No. 32 And No. 33 Terminals And Body Ground

Is there continuity?

YES - Go to step 9.

NO - Repair an open in the wire between the gauge control module (tach) and
the fuel tank unit.

9. Do the fuel gauge sending unit test (see FUEL GAUGE SENDING UNIT

TEST for R18A1 engine or FUEL GAUGE SENDING UNIT TEST for
R20Z3 engine ) .

Is the fuel gauge sending unit OK?

YES - Replace the gauge control module (tach).

NO - Replace the fuel tank unit.

DTC B1176: FUEL LEVEL SENSOR (FUEL GAUGE SENDING UNIT) CIRCUIT SHORT

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Wait for 30 seconds.
4. Check for DTCs with the HDS.

Is DTC B1176 indicated?

YES - Go to step 5.

NO - Intermittent failure, the fuel level sensor circuit is OK at this time. Check
for loose or poor connections.

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow
the instructions in B-CAN System Diagnosis Test Mode A
(see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS
TEST MODE A ).

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Gauges - Civic (All Except Hybrid)

5. Turn the ignition switch OFF.
6. Disconnect the fuel tank unit 4P connector.
7. Clear the DTCs with the HDS.
8. Turn the ignition switch OFF, and then back ON (II).
9. Wait for 30 seconds.

10. Check for DTCs with the HDS.

Is DTC B1176 indicated?

YES - Go to step 11.

NO - Replace the fuel gauge sending unit (see FUEL PUMP/FUEL GAUGE
SENDING UNIT REPLACEMENT for R18A1 engine or FUEL
PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT for R20Z3
engine ).

11. Disconnect the gauge control module (tach) 36P connector.
12. Check for continuity between the gauge control module (tach) 36P connector

No. 32 terminal and body ground.

Fig. 18: Checking Continuity Between Gauge Control Module (Tach) 36P
Connector No. 32 Terminal And Body Ground

Are there continuity?

YES - Repair a short in the wire between the gauge control module (tach) and
the fuel tank unit.

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Gauges - Civic (All Except Hybrid)

NO - Replace the gauge control module (tach).

DTC B1177: BATTERY VOLTAGE ABNORMAL

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Check for DTCs with the HDS.

Is DTC B1177 indicated?

YES - Go to step 8.

NO - Go to step 4.

4. Clear the DTCs with the HDS.
5. Turn the ignition switch OFF, and then back ON (II).
6. Crank the engine.
7. Check for DTCs with the HDS.

Is DTC B1177 indicated?

YES - Go to step 8.

NO - Intermittent failure. The gauge control module (tach) and power supply
voltage (IG1) that is supplied to the gauge control module (tach) are OK at this
time. The battery may have been discharged, and recovered.

8. Check the battery (see BATTERY TEST ) and the charging system.

Is the battery condition normal and the charging system OK?

YES - Go to step 9.

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow
the instructions in B-CAN System Diagnosis Test Mode A
(see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS
TEST MODE A ).

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Gauges - Civic (All Except Hybrid)