Air Conditioning (Diagnostics - Introduction): Diagnosis Scion xD I

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedures to troubleshoot the air conditioning system.
2. *: Use a Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Inspect the battery voltage. Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Use a Techstream to check if the CAN Communication System is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> Go to CAN COMMUNICATION SYSTEM. Refer to «PROBLEM SYMPTOMS TABLE»(ref-388782-S38885628272011031100000) A: Go to next step
4. CHECK FOR DTC* Check for DTCs and note any codes that are output. HINT: Refer to «DTC CHECK / CLEAR»(ref-388750-S24914727972011031100000) . Delete the DTCs. Recheck for DTCs. Based on the DTCs output above, try to force output of the A/C system DTC by simulating the operation indicated by the DTC. Result Result Proceed to DTC is not output A DTC is output B B --> Go to step 7 A: Go to next step
5. PROBLEM SYMPTOMS TABLE Refer to «PROBLEM SYMPTOMS TABLE»(ref-388750-S14189559692011031100000) . Result Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B B --> Go to step 7 A: Go to next step
6. OVERALL ANALYSIS AND TROUBLESHOOTING* DATA LIST / ACTIVE TEST. Refer to «DATA LIST / ACTIVE TEST»(ref-388750-S03627354472011031100000) TERMINALS OF ECU. Refer to «TERMINALS OF ECU»(ref-388750-S01955978902011031100000) ON-VEHICLE INSPECTION INSPECTION NEXT: Go to next step
7. ADJUST, REPAIR OR REPLACE NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the causes of the problem symptom. The potential cases of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

AIR CONDITIONING SYSTEM

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. CHECK AIR CONDITIONING AMPLIFIER HINT: Check from the rear of the connector while it is connected to the air conditioning amplifier. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition G7-1 (S5-3) - G7-12 (GND) Y - W-B Power supply for pressure sensor Ignition switch: ON 4.5 to 5.5 V G7-2 (TX+) - G7-12 (GND) V - W-B CAN communication line Ignition switch: ON Pulse generation ( see scheme 16waveform 1) G7-3 (TX-) - G7-12 (GND) W - W-B CAN communication line Ignition switch: ON Pulse generation ( (Scheme 32)waveform 2) G7-4 (SG-2) - Body ground L - Body ground Ground for evaporator temperature sensor Always Below 1.0 ohms G7-5 (TAM) - G7-11 (SG-1) W - B Ambient temperature sensor signal Ignition switch: ON 1.35 to 1.75 V Ambient temperature: 25 °C G7-6 (PRE) - G7-11 (SG-1) GR - B A/C pressure sensor signal Refrigerant pressure: normal 0.76 to 4.74 V G7-6 (PRE) - G7-11 (SG-1) GR - B A/C pressure sensor signal Refrigerant pressure: abnormal (less than 0.196 MPa [2.0 kgf/cm 2 ] or more than 3.14 MPa [32 kgf/cm 2 ]) Below 0.76 V or 4.74 V or more G7-7 (SOL+) - G7-12 (GND) LG - W-B A/C compressor operation signal Engine idling Pulse generation ( (Scheme 33)waveform 3) Blower switch: 1 A/C switch: ON G7-8 (IG+) - G7-12 (GND) Y - W-B Power source (IG) Ignition switch: ON 11 to 14 V G7-9 (SBLW) - G7-12 (GND) BR - W-B Blower motor ON signal Ignition switch: ON 11 to 14 V --> 0 V Blower switch: 0 --> 1 G7-10 (TE) - G7-4 (SG-2) GR - L Evaporator temperature sensor signal Ignition switch: ON 1.0 to 1.3 V Temperature near evaporator: 15°C (59°F) G7-11 (SG-1) - Body ground B - Body ground Ground for ambient temperature sensor Always Below 1.0 ohms G7-12 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 ohms G7-15 (A/C) - G7-12 (GND) LG - W-B A/C switch signal Ignition switch: ON Below 1 V --> 11 to 14 V Defroster: OFF A/C switch: OFF --> ON Defroster mode detection switch signal Ignition switch: ON Below 1 V --> 11 to 14 V A/C switch: OFF Defroster: OFF --> ON G7-16 (LED) - Body ground P - Body ground A/C switch indicator signal Engine idling 11 to 14 V --> Below 4 V A/C switch: ON Blower switch: 0 --> 1 G8-9 (PTC1) - G7-12 (GND) V - W-B PTC heater relay operation signal Engine idling Below 1 V --> 11 to 14 V No. 3 heater control knob: Max Hot Engine coolant temperature: Below 65°C (149°F) Ambient temperature: Below 10°C (50°F) Blower switch: 0 --> 1 Waiting time: 10 seconds G8-10 (PTC2) - G7-12 (GND) BR - W-B PTC heater relay operation signal Engine idling Below 1 V --> 11 to 14 V No. 3 heater control knob: Max Hot Engine coolant temperature: Below 65°C (149°F) Ambient temperature: Below 10°C (50°F) Blower switch: 0 --> 1 Waiting time: 20 seconds G8-12 (PTC3) - G7-12 (GND) R - W-B PTC heater relay operation signal Engine idling Below 1 V --> 11 to 14 V No. 3 heater control knob: Max Hot Engine coolant temperature: Below 65°C (149°F) Ambient temperature: Below 10°C (50°F) Blower switch: 0 --> 1 Waiting time: 30 seconds G8-14 (HEAT) - Body ground LG - Body ground MAX HOT switch detection signal Ignition switch: ON 11 to 14 V No. 3 heater control knob: Max Hot G8-23 (HLS) - Body ground LG - Body ground Headlight control signal Engine idling 11 to 14 V --> Below 1 V Light control switch: OFF --> HEAD G8-24 (ALT) - G7-12 (GND) P - W-B Generator (Alternator) operation signal Engine idling Pulse generation Waveform 1 (Reference): Using an oscilloscope CAN COMMUNICATION SIGNAL Terminal Name Between G7-2 (TX+) - G7-12 (GND) Tester Range 1 V / DIV., 10 μsec. / DIV. Condition Ignition switch ON HINT: The waveform varies depending on the CAN communication signal. Waveform 2 (Reference): Using an oscilloscope CAN COMMUNICATION SIGNAL Terminal Name Between G7-3 (TX-) - G7-12 (GND) Tester Range 1 V / DIV., 10 μsec. / DIV. Condition Ignition switch ON HINT: The waveform varies depending on the CAN communication signal. Waveform 3 (Reference): Using an oscilloscope COMPRESSOR AND PULLEY OPERATION SIGNAL Terminal Name Between G7-7 (SOL+) - G7-12 (GND) Tester Range 5 V / DIV., 500 μsec. / DIV. Condition Engine idling, Blower switch 1, A/C switch ON

DIAGNOSIS SYSTEM

1. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION»(ref-388639-S38434450612011031100000)

DTC CHECK / CLEAR

1. CHECK DTC Connect a Techstream to the DLC3. Turn the ignition switch to ON. Turn the tester on. Enter the following menus: Body Electrical / Air conditioner / Trouble Codes / Read the DTCs.
2. CLEAR DTC Connect a Techstream to the DLC3. Turn the ignition switch to ON. Turn the tester on. Enter the following menus: Body Electrical / Air conditioner / Trouble Codes / Erase the DTCs.

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using a Techstream to read the Data List allows the values or states of switches, sensor, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may by discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Warm up the engine. Turn the ignition switch to OFF. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the tester on. Enter the following menus: Body Electrical / Air Conditioner / Data List / According to the display on tester, read the "Data List". AIR CONDITIONER: Tester Display Measurement Item/Range Normal Condition Diagnostic Note Ambient Temperature Sensor Ambient temperature sensor / Min.: -23.3°C (-9.94°F) Max.: 65.95°C (150.71°F) Actual ambient temperature is displayed Open in circuit: -23.3°C (- 9.94°F) Short in circuit: 65.95°C (150.71°F) Adjusted Ambient Temp Adjusted ambient temperature / Min.: -30.8°C (-23.44°F), Max.: 50.8°C (123.44°F) - Open in circuit: -30.8°C (- 23.44°F) Short in circuit: 50.8°C (123.44°F) Evaporator Fin Thermistor Evaporator fin thermistor / Min.: -29.7°C (-21.46°F), Max.: 59.55°C (139.19°F) Actual evaporator temperature is displayed Open in circuit: -29.7°C (- 21.46°F) Short in circuit: 59.55°C (139.19°F) Engine Coolant Temperature Engine coolant temperature / Min.: 1.3°C (34.34°F), Max.: 90.55°C (194.99°F) Actual engine coolant temperature is displayed while engine is warmed up - Regulator Pressure Sensor Regulator pressure sensor / Min.: 0 kgf/cm 2 G, Max.: 38.25 kgf/cm 2 G Actual refrigerant pressure is displayed - Regulator Control Current Compressor variable output current / Min.: 0 A, Max.: 0.996 A - - Number of Trouble Codes Number of trouble codes / Min.: 0, Max.: 255 Number of DTCs will be displayed
2. ACTIVE TEST HINT: Using a Techstream to Perform the Active Tests allows relays, VSVs and actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect a Techstream to the DLC3. Turn the ignition switch to ON. Turn the tester on. Enter the following menus: Body Electrical / Air Conditioner / Active Test / According to the display on tester, perform the "Active Test". AIR CONDITIONER: Tester Display Test Part Control Range Normal Condition Magnetic Clutch Relay Magnetic clutch relay ON/OFF - Heater Active Level PTC heater active level Min.: 0, Max.: 3

DIAGNOSTIC TROUBLE CODE CHART

HINT

1. *1: If the ambient temperature is approximately -52.9°C (-63.22°F) or lower, DTC B1412 may be output even though the system is normal.
2. *2: The A/C amplifier memorizes the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.