2019 BP Shop Manual

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CHECK ENGINE LIGHT ILLUMINATES [SKYACTIV-G]

CHECK ENGINE LIGHT ILLUMINATES [SKYACTIV-G]

SM2334603

id0103s4888900

Troubleshooting item	Check engine light illuminates
Description	• Check engine light illuminates incorrectly. Note • If there is a malfunction in the engine system, the PCM stores a DTC and illuminates the check engine light.
Possible cause	• Emission system malfunction (DTC is stored in PCM) • Short or open circuit in PCM CAN communication line • Short or open circuit in instrument cluster CAN communication line • Short or open circuit in climate control unit CAN communication line • Instrument cluster malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY PCM DTC • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G (US))].)
1		No	Go to the next step.
2	INSPECT PCM CAN COMMUNICATION LINE FOR SHORT AND OPEN CIRCUIT • Inspect the applicable circuit for short and open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT INSTRUMENT CLUSTER CAN COMMUNICATION LINE FOR SHORT AND OPEN CIRCUIT • Inspect the applicable circuit for short and open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT CLIMATE CONTROL UNIT CAN COMMUNICATION LINE FOR SHORT AND OPEN CIRCUIT • Inspect the applicable circuit for short and open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT INSTRUMENT CLUSTER FOR MALFUNCTION • Inspect the applicable part. (See INSTRUMENT CLUSTER INSPECTION [(US)].) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification 1		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)].) • If the CAN communication is normal, perform the diagnosis from Step 1. ― If the malfunction recurs, go to the next step.
Repair completion verification 2	VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING • Verify repair information and verify that there is a new calibration in the PCM. • Is there a new calibration in the PCM?	Yes	Perform the PCM reprogramming and verify if the malfunction symptom was corrected. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
Repair completion verification 2		No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)