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Check reference values between ECM terminals and ground under the following conditions: ECM TERMINAL NO. ITEM CONDITION DATA (DC VOLTAGE) 18 Upstream O 2 sensor • Engine is running • Warm-up condition Approximately 0.1 V - 0.9 V (Change 5 - 8 times in 10 seconds periodically) 28 (With EOBD) 4 (Without EOBD) Downstream O 2 sensor heating - - 36 Sensor (GND) • Warm-up condition • Idle Approximately 0 V 48 (With EOBD) 1 (Without EOBD) Upstream O 2 sensor heating - - 55 Downstream O 2 sensor • Engine is running • Warm-up condition Approximately 100 mV On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION POSSIBLE CAUSE P0032 O 2 sensor 1 heater control circuit high Engine is running. • Fuel quality • Oxygen Sensor •Harness or connectors • ECM DTC 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 and select view data stream. • Start engine and warm it up to the normal operating temperature. • Turn ignition switch off and wait at least 10 seconds. • Start engine and keep the engine speed 2000 RPM for at least 1 minute. • Let engine idle for 2 minutes. • If DTC is detected, go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnosis & Testing Diagnostic Help in Sec- tion 03 Electronic Engine Controls). NOTE : DIAGNOSIS & TESTING 03
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