I took some pictures of the engine and ID stickers as well as looked at the engine block stamped ID which is J181119422
The PCM behind the glove box has these markings stamped on the back:
33920-69GL - 1
069GL
1.8 E33 MT
8T ( in large letters)
FI-420A A2 1314
Hitachi Ltd Tokyo Japan
The car is a 2001 Suzuki Esteem 5 door wagon. It is a 2001 5 speed manual transmission J18. The used car came with dealer service records, which indicate the engine is original to the car.
The OBD2 scanner I used is an Autel 519 and it reports no current DTCs and no codes pending. CEL is off.
The scanner shows the engine goes into Closed Loop after about 1 minute of idling warm up after cold start.
I think the fast idle device (wax pellet plunger pushing against a small cam) is working but it does seem to take longer than usual (about 3-4 minutes) to fall from about 1400 rpm to 750 rpm. The coolant temperature at closed loop is about 82 degrees F. The car does not settle down to 750 rpm warm idle until the temperature gauge needle is at mid point (about 180 degrees F reported by the OBD scanner)
If I switch the headlights on, the idle does not always speed up, but it generally holds at 750 rpm or slightly higher and then slowly returns to 750 rpm after about 4 seconds..
The TPS part number label reads: HITACHI SERA483-06 (C 12 07)