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89–95 SIDEKICK & SAMURAI w/TBI FUEL INJECTION
12 All Clear (No Fault Detected)
13 O2 Sensor circuit
14 Coolant Temperature Sensor Circuit
15 Coolant Temperature Sensor Circuit
21 Throttle Position Sensor Circuit
22 Throttle Position Sensor Circuit
23 Intake Air Temperature Sensor Circuit
24 Vehicle Speed Sensor Circuit
25 Intake Air Temperature Sensor Circuit
31 Atmospheric Pressure Sensor Circuit
32 Atmospheric Pressure Sensor Circuit
41 Ignition Signal Circuit
42 Crank Angle Sensor Circuit
44 Idle Switch Sensor Circuit
45 Idle Switch Sensor Circuit
51 EGR System & Recirculated Exhaust Gas Temperature Sensor
53 Ground Circuit
54 Fifth Gear Switch Circuit
71 Test Switch Circuit
ON ECM failure
 

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I did a little searching and from what I read it may be indicative of a problem with your MAP sensor. Someone here will tell you a better and more definitive answer.
 

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Code 31 is Manifold Absolute Pressure Sensor (MAP sensor). The MAP sensor is usually mounted on the bulkhead and has a pipe going to the inlet manifold. Check that the pipe is in good condition and that the inline filter is clean, then check that you have 5V and ground on two of the terminals, the voltage on the other terminal should vary with load.
 

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Like Rhinoman posted, check all the hoses and connectors going to the MAP sensor. The sensor itself rarely goes out. When they do they are one of the more expensive pieces of plastic under the hood. Costs almost as much for a rebuilt throttle body.
 
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