2.3L HSC/CFI

Use this test procedure ONLY when directed to do so by results of QUICK TEST  or steps in CIRCUIT TESTS  . Follow test procedure carefully.

1. When engine runs rough, misfires, stalls, lacks power, or idles roughly, perform the following checks:
   • Perform SYSTEM CHECK, MAP Check. Use TEST QQ - SYSTEM CHECK  , step 2).
   • Check MAP sensor, using TEST H - MAP/BP SENSOR  , step 12).
   • Check EGR valve for correct function.
   • Check for, and repair, any bad ground or power connections.
   • Check ignition components (cap, rotor, wires, coil, and plugs).
   • Check basic engine components (valves, cam timing, compression, etc.).
2. If engine idle speed is low with A/C on, go to TEST O - NEUTRAL A/C SWITCH  , step 9).
3. If engine stumbles after hot restart, check HEGO. Use TEST W  , step 18).
4. If shift indicator light is always on or off, go to TEST FF - SHIFT INDICATOR LIGHT  , step 1).
5. If engine stalls while parking vehicle, go to TEST R - PSPS  , step 3).
6. If engine idle speed is high in Drive (Auto. Trans. only), place transmission in "D" with engine off. Test Neutral/Drive Switch (NDS) circuit (test pin No. 30 on breakout box) for short to ground. Circuit should NOT have continuity to ground in Drive. If necessary, repair wiring.
7. If fuel pump always runs, go to TEST Y - INERTIA SWITCH  , step 12).
8. If A/C does not cut off under wide open throttle (WOT) conditions or if A/C is inoperative, go to TEST GG - A/C CUT-OUT (WAC)  , step 1).