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That code indicates a TCC PWM Solenoid Circuit Failure (torque converter
clutch pulse width modulation (TCC PWM) solenoid valve controls the
acting on the converter clutch valve): http://www.troublecodes.net/isuzu/iszuobd2.shtml is where I found that information. I hope that will help.
CHECK FOR VACUUM LEAKS. MOST OF THE TIME YOU WILL HEAR A WHISTLING NOISE OR A SUCKING SOUND. YOU CAN GET A CAN OF SPRAY CARB CLEANER AND SPRAY AROUND ENGINE,IF ENGINE CHANGES RPM'S THAT AREA IS OF CONCERN. POSSIBLE AIC VALVE STICKING OR SLOW TO RESPOND.
SWITCH ASM; POWER,IGN COIL
Go to myisuzuparts.com and find this part number. This part is under the intake manifold. No crank sensor as is has a distributor.
05-1990 to 08-1994
alot of the 4clys had ajustable tappets that might need adjusting
V6 have tappets adjusted also but are shims on top of bucket over valve spring, this is hard to do as you may need to change shims to get correct valve clearances suggest dealer to do.
if the noise comes in and out while maintaining 1500-2000rpm when stationary it is possibly worn valve guides which is common on high km vehicle.(head repairs)
it's on the bottom of the motor, towards the back on the passenger side. It has a small clip of wires and one screw holding it on. You may want to pull it up on ramps- if it'll run- otherwise, get under the Rodeo, it's up a little higher than the oil pan, and to the passenger side. (it's right on top of the two lines that run to the bottom of the radiator.) You will need a 10mm socket to remove it. I have added a few pics showing the location (i just completed this task myself)