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Honda Fit/Jazz - DTC Troubleshooting: P0118 (6-2) (L15A 5MT)
Online Honda Fit/Jazz 2002-2005 Workshop repair manual used by professionals.
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Snip from the Manual
DTC Troubleshooting: P0118 (6-2)
DTC P0118 (6-2): ECT Sensor Circuit High Voltage
1.Turn the ignition switch ON (II).
2.Check the ECT with the scan tool.
Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated?
YES - Go to 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the ECT sensor and at the ECM/PCM.n
3.Turn the ignition switch OFF.
4.Disconnect the ECT sensor 2P connector.
5.Connect the ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
IMAGE REPLACED HERE
6.Turn the ignition switch ON (II).
7.Check the ECT with the scan tool.
Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated?
YES - Go to 8.
NO - Replace the ECT sensor.n
8.Turn the ignition switch OFF.
9.Remove the jumper wire.
10.Connect ECM/PCM connector terminals A10 and B8 with a jumper wire.
IMAGE REPLACED HERE
11.Turn the ignition switch ON (II).
12.Check the ECT with the scan tool.
Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n
NO - Repair open in the wire between the ECM/PCM (A10, B8) and the ECT sensor.n
ON (II).