Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Procedures
1996 Isuzu Trooper S, AutomaticSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 1996 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
- Perform On-Board Diagnostic (OBD) System Check. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
- Turn ignition on, engine off. Using scan tool, read MAP value. If value is less than 65 kPa, go to next step. If value is 65 kPa or more, go to step 6).
- Disconnect MAP sensor harness connector. Connect a test light between MAP sensor harness connector 5-volt reference and signal circuits. Using scan tool, read MAP value. If value is less than 65 kPa, go to step 5). If value is 65 kPa or more, go to next step.
- Check MAP sensor signal circuit for open or short between PCM and MAP sensor. If problem is found, repair as necessary and go to step 13). If no problem is found, go to step 12).
- Replace MAP sensor and go to step 13).
- Observe scan tool TP ANGLE value while moving throttle from closed to wide open. If value increases steadily and evenly from closed to open throttle, go to DIAGNOSTIC AIDS . If value does not change as specified, go to next step.
- Disconnect TP sensor harness connector. If value is zero, go to next step. If value is more than 0%, go to step 9).
- Connect a test light between TP sensor harness connector 5-volt reference circuit and signal circuit. Using scan tool, read TP sensor voltage. If scan tool voltage is 5 volts, go to step 11). If voltage is not about 5 volts, go to step 10).
- Check TP sensor signal circuit for short to ground, and ground circuit for high resistance and poor connection. If a problem is found, repair as necessary and go to step 13). If no problem is found, go to step 12).
- Check TP sensor 5-volt reference circuit for poor connection or high resistance between PCM and TP sensor. If a problem is found, repair as necessary and go to step 13). If no problem is found, go to step 12).
- Replace TP sensor and go to step 13).
- Replace PCM. Program replacement PCM using required equipment. Go to next step.
- Turn ignition on, engine off. Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P0117. If scan tool displays DTC P0117 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P0117 FAILED THIS IGN, repair is complete.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.