If it has spark, it suggests the RPM sensor is okay.
#4 would be radio suppression relay, over near the coolant tank in NA, or over near the power steering fluid reservoir in a turbo.
Tried the DTM3 trick?
Diagnostic Test Mode 3: Injection System Component Activation Test
- Turn the ignition ON to KPII and install the cable into socket 2 for fuel-injection-related tests.
- Press the button three times for one second each time (waiting between >1 and < 3 seconds before pressing again)
- The diagnostic unit then sequentially tests the following components: engine coolant fan (if equipped), fuel injectors, idle air control solenoid valve, carbon filter solenoid valve (if equipped), cold start valve, radio suppression relay and fuel pump. No code is produced: you have to listen or feel each in turn to make sure it is operating.
- Exit by switching off the ignition.
Wiring route for injectors depends if turbo or NA, the turbo has the ballast resistors located in the general area of the battery.