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Inspection procedure 3: The malfunction indicator lamp (SERVICE ENGINE SOON or check engine lamp) remains illuminated and never goes out
 
 
 
 
COMMENT
  • In cases such as the above, the cause is probably that the ECM is detecting a problem in a sensor or actuator, or that one of the malfunctions listed below has probably occurred.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this case:)
  • Combination meter failed.

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), read the diagnostic trouble code (DTC).
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Turn on the power supply mode of the electric motor switch.
(3) Read the DTC.
(4) Turn off the power supply mode of the electric motor switch.
Is any DTC set?
Refer to Diagnostic Trouble Code Chart .
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), read the diagnostic trouble code (DTC).
(1) Turn on the power supply mode of the electric motor switch.
(2) Read the PHEV-DTC.
(3) Turn off the power supply mode of the electric motor switch.
Is the PHEV-DTC set?
Refer to GROUP 54Da, Diagnostic Trouble Code Chart .
Go to Step 3.
 
STEP 3. Check the trouble symptoms.
(1) Turn on the power supply mode of the electric motor switch.
  • The malfunction indicator lamp (SERVICE ENGINE SOON or Check Engine Lamp) should go out after the engine was started.
(2) Turn off the power supply mode of the electric motor switch.
Does the malfunction indicator lamp (SERVICE ENGINE SOON or Check Engine Lamp) go out?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Check the combination meter system. Refer to GROUP 54A, Combination Meter - Trouble Symptom Chart .