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You have a Code 6, a fault with the Engine coolant Temperature ( TW) sensor. This circuit is NOT related to the cooling fans or radiator. The sensor is exclusively for sending the cooant temperature readings to the ECU.
The wrong signals are being sent to the ECU which is in turn keeping the injectors opened for longer periods than required and thus flooding the cylinders.
Here are the diagnostics.
Coolant Temperature (TW) Sensor
The TW sensor uses a temperature sensitive resistor (thermistor) to measure coolant temperature. Resistance of thermistor decreases with a rise in coolant temperature.
CODE 6: COOLANT (TW) SENSOR
1. Turn off ignition. Remove hazard fuse in main fuse box for 10 seconds to reset ECU. Start engine and observe Check Engine light. If light is off, problem is intermittent. Test drive and check again.
2. IF light is on, warm engine to normal operating temperature (cooling fan on). Disconnect C101 (1.5L and standard) or C151 (HF and Si) connector from C210 connector. See Fig. 6. Measure resistance between Red/White wire terminal and Green/White wire terminal of C101 or C151 connector, on sensor side of harness. If resistance value is not 200-400 ohms, inspect for short or open in Red/White or Green/White wire between connector and coolant sensor. If wires are okay, replace coolant sensor.
3. If resistance values are within specification, reconnect connectors. Disconnect 2-wire connector directly from coolant sensor. Measure voltage between ground and Red/White wire on sensor harness. If voltage is not about 5 volts, go to step 5). If voltage reads about 5 volts, measure voltage between Red/White (pos.) and Green/white (neg.) wires. If about 5 volts is not present, repair open in Green/-White wire between ECU and coolant sensor.
4. If voltage reading from Green/White wire to Red/White wire of coolant sensor harness was about 5 volts, substitute a known good ECU. If about 5 volts is now read, replace original ECU.
5. If voltage reading from ground to Red/White wire of coolant sensor harness was not about 5 volts in step 3), turn ignition off. Connect system checker harness between ECU and ECU connector. Turn ignition on. Measure voltage between terminals C6 (pos.) and C12 (neg.). If about 5 volts is present, repair open in Red/White wire between ECU terminal C6 and coolant sensor.
6. If voltage reading is not about 5 volts, disconnect "C" connector from main wiring harness only, not at ECU. Measure voltage between terminals C6 (pos.) and C12 (neg.). If about 5 volts is now indicated, repair short in Red/White wire between ECU terminal C6 and sensor.
7. If about 5 volts is not indicated, substitute a known good ECU. If condition is rectified, replace original ECU.
Saturday, June 26th, 2010 AT 8:38 AM