P1402 Buick Code – Exhaust Gas Recirculation Supply Circuit

Possible Causes

Faulty Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation Valve harness is open or shorted
Exhaust Gas Recirculation Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

الأسباب المحتملة

إعادة تدوير غاز العادم الخاطئ (EGR) صمام إعادة تدوير الغازات في ValveExhauct مفتوح أو مختصر لإعادة تدوير الغاز الدائرة الكهربائية الفقيرة.

Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

الأعراض المحتملة

ضوء المحرك (أو خدمة محرك قريبا ضوء تحذير) ضوء)

Description

Code P1402 Buick Description
The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. The EGR position sensor provides a signal voltage that changes relative to the EGR position. The EGR position sensor information is transmitted between the EGR valve and the ECM on the signal circuit. The Mass Air Flow (MAF) sensor signal is used by the ECM to detect the proper amount of EGR flow. The ECM will close the EGR valve, then open the EGR valve to 100%. The ECM will then calculate the MAF difference and determine if the proper EGR flow has been detected. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a low voltage on the EGR motor supply for greater than 2.5 s.
P1402 Buick Code – Exhaust Gas Recirculation Supply Circuit

الشرح

الرمز ٪ 20p1402 ٪ 20buick ٪ 20descriptionThe ٪ 20Engine ٪ 20Control ٪ 20module ٪ 20 (ECM) ٪ 20Supplies ٪ 20The ٪ 20exhaust ٪ 20gas ٪ 20 Recirculation ٪ 20 ٪ 20low ٪ 20 من 20 درجة المئوية 20circuit ، ٪ 20an ٪ 20h 20h-bridge ٪ 20motor ٪ 20 Directional ٪ 20control ٪ 20circuit ، ٪ 20 و 20a ٪ 20a 20signal ٪ 20circuit. ٪ 20The ٪ 20egors ٪ 20position ٪ 20sensor ٪ 20a ٪ 20a ٪ 20signal ٪ 20voltage ٪ 20. 20Changes ٪ 20 Relational ٪ 20to ٪ 20Teal 20 the ٪ 20eg ٪ 20position. ٪ 20The ٪ 20egr ٪ 20position ٪ 20Sensor ٪ 20Information ٪ 20is ٪ 20TRANSTEDS ٪ 20BETWENE 20 ٪ 20mass ٪ 20air ٪ 20flow ٪ 20 (MAF) ٪ 20sensor ٪ 20signal ٪ 20is ٪ 20uses ٪ 20by ٪ 20Teal 20eCm ٪ 20to ٪ 20detect ٪ 20The ٪ 20proper ٪ 20amount ٪ 20eg ٪ 20eg 20fflow. ٪ 20The ٪ 20 -smlen ٪ 20will ٪ 20Close ٪ 20The ٪ 20EGR ٪ 20Valve ، ٪ 20th ٪ 20open ٪ 20THER 20 ESTER ٪ 20EGR ٪ 20FLOW ٪ 20HAS ٪ 20been ٪ 20DETICED. ٪ 20THS ٪ 20DIAGENOSTIC ٪ 20TroUBLE ٪ 20Code ٪ 20 (DTC) ٪ 20will ٪ 20be ٪ 20 حدد ٪ 20when ٪ 20 the ٪ 20ecm ٪ 20 detects ٪ 20a ٪ 20low ٪ 20voltage ٪ 20on ٪ 20Te ٪ 20Supply ٪ 20Circuit

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