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Check reference values between ECM terminals and ground under the following conditions: ECM TERMINAL NO. ITEM CONDITION DATA (DC VOLTAGE) 3 ECM ground (IGN) Ignition switch: ON Approximately 0 V 51 ECM ground (Signal) Ignition switch: ON Approximately 0 V 53 ECM ground (Signal) Ignition switch: ON Approximately 0 V 61 ECM ground (Power) Ignition switch: ON Approximately 0 V 80 ECM ground (Power) 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. • Turn ignition switch on. • Start engine then select view data stream. • If the data stream is detected, the condition is intermittent (See Diagnosis & Testing Diagnostic Help in Section 03 Electronic Engine Controls). • If data stream is not detected, go to Diagnostic Procedure - Step 1. 1. INSPECTION START • Start engine. Is engine running? Yes >> Go to step 7. No >> Go to step 2. 2. CHECK ECM POWER SUPPLY CIRCUIT - (1) • Turn ignition switch off and then on. • Check voltage between ECM terminal 13 and ground. • Battery voltage should exist. Is the check result normal? Yes >> Go to step 4. No >> Go to step 3. DIAGNOSIS & TESTING LTSMD030061 03
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