Toyota CH-R Service Manual: How To Proceed With Troubleshooting

HINT:

• When troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
• Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

• The following 5 items are important points for problem analysis:

  What	Vehicle model, system name
  When	Date, time, occurrence frequency
  Where	Road conditions
  Under what conditions?	Driving conditions, weather conditions
  How did it happen?	Problem symptoms

• The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU memory whenever a malfunction in the signal circuits to the ECU occurs. In a DTC check, DTCs stored by a previous malfunction can be checked by a technician during troubleshooting.

• Another function is the Input Signal Check, which checks if the signals from various switches are sent to the ECU correctly.

  By using these functions, the problem areas can be narrowed down and troubleshooting can be more effective. Diagnostic functions are incorporated in the following systems of this vehicle.

  System	Symptom Confirmation and Diagnostic Trouble Code
  	DTC Check (Normal Mode)	DTC Check (Check Mode)	Sensor Check/Test Mode (Input Signal Check)	Data List	Active Test
  SFI System	○	○	-	○	○
  Ignition System	-	-	-	-	-
  Fuel System	-	-	-	-	-
  Emission Control System	-	-	-	-	-
  Intake System	-	-	-	-	-
  Cooling Fan System	-	-	-	-	-
  Cruise Control System	○	-	-	○	○
  Dynamic Radar Cruise Control System	○	-	-	○	○
  Forward Recognition Camera System	○	-	-	○	○
  Lane Departure Alert System (w/ Steering Control)	○	-	-	○	○
  Continuously Variable Transaxle System	○	○	-	○	○
  Tire Pressure Warning System	○	-	○	○	○
  Vehicle Stability Control System	○	-	○	○	○
  Electric Parking Brake System	○	-	-	○	○
  Steering Lock System	○	-	-	○	○
  Power Steering System	○	-	-	○	-
  Audio and Visual System (for Radio Receiver Type)	-	-	-	-	-
  Audio and Visual System (for Radio and Display Type)	○	-	-	○	-
  Navigation System	○	-	-	○	-
  Blind Spot Monitor System	○	-	-	○	-
  Rear View Monitor System	-	-	-	-	-
  Safety Connect System	○	-	-	○	-
  Toyota Entune System	○	-	-	-	-
  Charging System	○	-	-	○	○
  LIN Communication System	○	-	-	○	-
  CAN Communication System	○	-	-	○	-
  Power Door Lock Control System	-	-	-	○	○
  Wireless Door Lock Control System (w/ Smart Key System)	○	-	-	○	○
  Wireless Door Lock Control System (w/o Smart Key System)	-	-	-	○	○
  Key Reminder Warning System	-	-	-	○	-
  Smart Key System (for Entry Function)	○	-	-	○	○
  Smart Key System (for Start Function)	○	-	-	○	○
  Immobiliser System (w/ Smart Key System)	○	-	-	○	○
  Immobiliser System (w/o Smart Key System)	○	-	-	○	○
  Theft Deterrent System	-	-	-	○	○
  Lighting System (INT)	-	-	-	○	○
  Window Defogger System	-	-	-	-	○
  Windshield Deicer System	-	-	-	-	○
  Meter / Gauge System	○	-	-	○	○
  Clock System	-	-	-	-	-
  Airbag System	○	○	-	○	-
  Pre-collision System	○	-	-	○	○
  Front Power Seat Control System	-	-	-	-	-
  Seat Heater System	-	-	-	-	-
  Seat Belt Warning System	-	-	-	○	○
  Air Conditioning System (for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor)	○	-	-	○	○
  Air Conditioning System (for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor)	○	-	-	○	○
  Accessory Socket System	-	-	-	-	-
  Power Window Control System	○	-	-	○	○
  Fuel Lid Opener System	-	-	-	-	-
  Power Mirror Control System	-	-	-	○	○
  Wiper and Washer System	-	-	-	-	-
  Lighting System (EXT)	○	-	-	○	○
  Automatic Headlight Beam Level Control System	○	-	-	○	○
  Automatic High Beam System	○	-	-	○	-
  Horn System	-	-	-	-	○

• In the DTC check, it is very important to determine whether the problem indicated by the DTC either: 1) still occurs, or 2) occurred in the past but has returned to normal. In addition, the DTC should be compared to the problem symptom to see if they are related. For this reason, DTCs should be checked before and after confirmation of symptoms (i.e., whether or not problem symptoms exist) to determine current system conditions, as shown in the flowchart below.

• Never skip the DTC check. Failing to check for DTCs, depending on the case, may result in unnecessary troubleshooting for systems operating normally or lead to repairs not related to the problem. Follow the procedure listed in the flowchart in the correct order.

• The following flowchart shows how to proceed with troubleshooting using the DTC check. Directions from the flowchart will indicate how to proceed either to DTC troubleshooting or to the troubleshooting of each problem symptom.

NOTICE:

• Do not heat components to more than 60°C (140°F). Exceeding this temperature may damage the components.
• Do not apply heat directly to parts in an ECU.

NOTICE:

• Never sprinkle water directly into the engine compartment. Indirectly change the temperature and humidity by spraying water onto the front of the radiator.
• Never apply water directly onto the electronic components.

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