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Check the under hood fuse and relay center for a 30 amp fuse marked RDI-1 also the cooling fan relay right next to the fuse. Did you check for current at the motor? If there is current there with the switch on change the coolant temperature sensor. If no current and the fuse is good suspect the relay and swap it with one with the same number. I hope this helps. Take care.
When a code P0688 is stored, it means that the powertrain control module (PCM), has detected an abnormality in the relay which supplies it with voltage. In this case the relay sensor circuit is open. Open could be translated as disconnected.
Symptoms of a P0688 trouble code include:
- Delayed or no start
- Electrical accessories may be inoperative
- Engine drivability issues
A diagnostic scanner and a digital volt/ohmmeter (DVOM) will be required to diagnose a code P0688.
Test all system fuses and relays to make sure the PCM power supply relay is being supplied with battery voltage. If constant (or switched) voltage is not present at the power relay connector, trace the appropriate circuit back to the fuse or relay from which it originates. Repair or replace defective fuses or fusible links as required.
If the manual fails to include or mention certain items for a problem, it would be best to go to the fuse boxes. Normally a blown fuse is caused by a short after the main fuse. So this means you may will have to check the fuses individually. The fuses are normally located under the dash on the driver side. The cover would have its own labels for you to identify which fuse are found inside the box.
check under the hood in the fuse box pull the fuse and see if the wire in it is burned or broken if not then its good also if it good which im guessing it is. Im putting my money on the relay which is in the fuse box in the hood also and i will include a pic of the right relay to check i would swap the relays around and see if they turn on. Relays run aprx $35 heres a pic for you hope this helped you thanks
After seeing a broken cam the dealer should have recommended a RDI of the engine(remove, disassemble and inspect). Cams don't break on their own. Low oil pressure is usually the cause and will damage other internal parts such as rod and main bearings.After the RDI a complete list of the damage would have been had and you could have made a decision from there. It was rather irresponcible of the dealer to just replace ther head and cam without the RDI.
The Normal Temperature Range to the Fan Start is: A/C ON 181 F.
A/C OFF 199 F. When the Engine Reach this Temperature the Fan should start.
OK. Do this simple test.
1---- Start the engine, Desconnect the ECT Switch located on the Radiator,
See if the Fan come ON. If yes, if not go to step #2
Connect the ECT SWITCH and leave the car Running and with a Temperature gage.
See the temperature, if the Temperature go more than 199 F.
Turn the Engine OFF.
Disconnect the ECT sensor and check for Ground at the WHITE/BLACK wire.
If ground exist, Replace the ECT switch.
But if not. Check the wire for any damaged, and the ground at the Front Left Fender.
Repair as need.
2---- check the Fuse link RDI FAN . 30 amp.
Check the Fuse link CDS FAN 30 amp.
Replace if need.
And Return to step # 1.
Check the Radiator fan Relay, Rad fan relay 2 and 3. Replace if need.
Ok. I hope this help on your question.
I can give to you the WIRING DIAGRAM of the Fans, But I need a E-MAIL adress to do that.
You should check the 30 amp "RDI" fuse and the 7.5 ECU-IG fuse. Both fuses are critical to the operation of the fan system. The RDI fuse sends power to the fan #1 relay. The A/C amplifier turns on power to the fan #1 relay, this is why your fan works on A/C.
Now, with no cooling fan under "normal conditions" (A/C off), you need to have a good fan #2 relay, and a good water temp switch. This switch is on the engine, near the thermostat housing (I think); with a single plug, with a white with a blue trace wire going to it. Remove this wire from the sender, and jump it to ground (anywhere on the metal of the engine) with the key on (engine OFF). If the fan starts, you need a new water temp sending unit. If not, then consider a new fan #2 relay. This system is pretty simple.
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