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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-230 TROUBLESHOOTING HINTS (The most • Cylinder 1, 4 heated oxygen sensor (front) deteri- orated. • Harness damage in cylinder 1, 4 heated oxygen sensor (front) output line. • Cylinder 1, 4 heated oxygen sensor (rear) deteri- orated. If the cylinder 1, 4 heated oxygen sensor (rear) • Open circuit in cylinder 1, 4 injector. • Harness damage in cylinder 1, 4 injector circuit. • Connector damage. • PCM failed. • Exhaust leak. • Air drawn in from gaps in gasket, seals, etc. • Incorrect fuel pressure. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A • MB991316: Test Harness STEP 1. Using scan tool MB991958, check data list item 69: CAUTION To prevent damage to scan tool MB991958, always turn the 69, Cylinder 1, 4 Heated Oxygen Sensor (rear). • Warming up the engine. When the engine is revved, the output voltage should repeat 0 volt and 0.6 to 1.0 volt (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 2. − Cylinder 1, 4 Heated Oxygen Sensor Circuit (sensor 2) , DTC P0137 − Cylinder 1, 4 Heated Oxygen Sensor Circuit Low , DTC P0138 − Cylinder 1, 4 Heated Oxygen Sensor Circuit High Voltage , DTC P0139 − Cylinder 1, 4 Heated Oxygen Sensor Circuit Slow Response AK303804AB MB991910 DATA LINK MB991824 MB991827 |