What relay control cruise control on a 94 sundance

I would not think a fuse would be the problem. A fuse either blows or it is good. The relay might be at fault, but I would think it is the pump going bad.

the temperature sending unit is faulty,

try replacement of the brake light switch

11 Timing belt skipped 1 tooth or more from initial learned value, Intermittent loss of either camshaft or crankshaft position sensor, No crank reference signal detected during engine cranking
12 Direct battery input to PCM/ECM was disconnected within the last 50 key-on cycles (normal)
13 No change in MAP from start to run
14 MAP sensor voltage too low
15 No vehicle speed sensor signal
17 Closed loop temp not reached or engine cold too long
21 02s sensor problem (oxygen sensor), upstream or down stream
22 Engine coolant temp sensor out of range
23 Intake air temp sensor out of range
24 Throttle Position sensor out of range
25 Idle air control motor circuits, target idle not reached (+/- 200),vacuum leak found
27 Injector control circuit
31 Evap purge flow monitor failure or evap solenoid circuit
32 EGR system failure
33 A/C clutch relay circuit
34 Speed control Solenoid circuits
35 Rad Fan control relay circuit
37 Torque converter clutch solenoid CKT or park/neutral switch failure
41 Generator field not switching properly
42 Fuel pump relay control ckt, Auto shutdown relay control ckt, No ASD relay output voltage at PCM, Fuel level sending unit volts out of range, Fuel level unit No change over miles
43 Multiple/ single cylinder misfire
44 Battery temp sensor volts out of range
46 Charging system voltage too low
51 Fuel system lean
52 Fuel system rich
53 Internal control failure
54 No Cam signal at PCM
55 End of error messages (If you get this only, no errors were found)
62 PCM failure SRI mile not stored
63 PCM Failure EEPROM write denied
64 Catalytic Converter Efficiency Failure
65 Power steering switch failur

Quite often you'll find resistor on firewall, of passenger side under hood. 1-1/2"x3" block attached to firewall. In area of where heater hoses enter.

there is a control box for the cruise control behind the glove box . You can remove the cover by pushing in from both sides of the glove box door . the control box will be just inside the glove box to the top. it simply unplugs. any junk yard with an aerostar or ranger or explorer will have one of these control boxes fairly cheap. these control boxes are commonly known to just quit workingand are a very easy fix.

Try inspecting the cruise control actuating switches for broken wires and loose connections. If that isn't it check the cruise control fuse on the fuse box. Hope this is helpful

you know the relay works, you checked it, make sure you have power going to the relay and power at the pump