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Specification data are reference values and are measured between each terminal and ground. TERMINAL NO. ITEM CONDITION DATA (DC VOLTAGE) 13 ECM ground Ignition switch: ON Approximately 0 V 26 ECM ground Ignition switch: ON Approximately 0 V Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Turn ignition switch off. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Start the engine and warm it to normal operating temperature. • With the scan tool, select view data stream. • If the data stream is not detected, the condition is current. Go to Diagnostic Procedure Step 1. • If the data stream is detected, the condition is intermittent (See Diagnosis & Testing Diagnostic Help in Section 03 Electronic Engine Controls). NOTE : Diagnostic Procedure 1. INSPECTION START • Start engine. Is engine running? Yes >> Go to step 8. No >> Go to step 2. 2. CHECK ECM POWER SUPPLY CIRCUIT - (1) • Turn ignition switch OFF and then ON position. • Check voltage between ECM terminal 66 and ground. • Battery voltage should exist. Is the check result normal? Yes >> Go to step 5. No >> Go to step 3. DIAGNOSIS & TESTING LTSMD030074 03
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