Measure voltage between the ECM connector terminals B93 and B95. Wire side of female terminals MAP sensor 3P connector JUMPER WIRE Is there about 5 V? YES – Repair the wire between ECM and the MAP sensor. NO – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM. NOTICE The battery power supply short circuit to 5 V power supply damages the ECM.

DTC P0238: Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage Check the ''On Board Diagnostic (OBD) System Check''. Was the ''OBD System Check'' performed? YES – Go to step 2. NO – Go to OBD System Check. Check the DTC. Are there other DTCs P1628, P1618 (beside DTC P0238) being output? YES – Go to DTC P1628, P1618 chart (5 V reference #2 circuit failure). NO – Go to step 3. Turn the ignition switch ON (II). Check the MAP with the scan tool. Is about atmospheric pressure indicated? YES – Go to step 5. NO – Go to step 7. Start the engine and allow it to idle. Check the MAP with the scan tool. Is about 20 – 30 kPa (150 – 225 mmHg, 5.9 – 8.9 in. Hg) indicated? YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the MAP sensor and at the ECM. NO – Go to step 7. Turn the ignition switch OFF. Disconnect the MAP sensor 3P connector. aaa