DTC Troubleshooting

DTC TROUBLESHOOTING PROCEDURES

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2	DTC check Is there DTC(s) other than P0116?	Go to applicable DTC diag. flow.	Go to Step 3.
3	Engine coolant temperature check With ignition switch OFF, connect scan tool to DLC. With ignition switch ON, check engine coolant temperature displayed on scan tool. (ECT 1) Warm up engine to normal operating temperature. Check engine coolant temperature displayed on scan tool. (ECT 2) Is difference between ECT 1 and ECT 2 less than 2 °C?	Go to Step 5.	Go to Step 4.
4	Thermostat check Check thermostat referring to THERMOSTAT INSPECTION . Is thermostat in good condition?	Go to Step 5.	Replace thermostat.
5	ECT sensor circuit check With ignition switch OFF, connect scan tool to DLC and disconnect ECT sensor connector (1). With ignition switch ON, check engine coolant temperature displayed on scan tool. ECT sensor temperature specifications Signal wire terminal (2) and ground wire terminal (3) in ECT sensor connector are shorted by service wire (4): 130 °C (266 °F) Signal wire terminal (2) and ground wire terminal (3) in ECT sensor connector are opened: -40 °C (-40 °F) Courtesy of SUZUKI OF AMERICA CORP. Is check result as specified?	Go to Step 6.	Check ECT sensor signal and ground circuits referring to Step 2 of DTC P0117 / P0118: ENGINE COOLANT TEMPERATURE CIRCUIT LOW / HIGH .
6	ECT sensor performance check Check ECT sensor referring to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION . Is check result as specified?	Substitute a known-good ECM and recheck.	Replace ECT sensor.