Your Daihatsu U4 engine control system detects a problem, the computer stores the diagnostic trouble
code P1771 in its memory.
To figure out what is wrong with your vehicle you must first extract the P1771 DTC For Daihatsu U4.
To solve P1771 Daihatsu U4 problem, you'll have to remove the muffler, crankcase and other components blocking the valve chamber. Then, remove the cylinder head bolts (label for easy re-installation) Adjust the jaws of the valve spring compressor until they touch the top and bottom of the valve chamber Push the tool in to compress the spring and tighten the jaws Remove the retainers and lift out the valves , compressors and springs
P1771 Daihatsu U4 DTC Meaning
Powertrain Code - Problem is related engine, transmission and emissions systems.
MFG - Manufacturer Specific
Ignition System Or Misfire
Exhaust Gas Recirculation System Valve 1
PCM Stack Overrun
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P1771 Daihatsu U4 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.