LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Symptom Troubleshooting - Manual A/C) >> Windshield Fogged [Manual Air Conditioner] >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
WINDSHIELD FOGGED (MANUAL AIR CONDITIONER) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 COOL AIR BLOW OUT INSPECTION
  • When both the A/C switch and airflow volume control dial in the climate control unit are on, does cool air blow out from the vent?
 Yes Go to the next step.
No Go to Step 1 of the following troubleshooting.
(See NO COOL AIR [MANUAL AIR CONDITIONER] .)
2 INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER UNIT OR AIR INTAKE ACTUATOR
  • Switch the ignition ON (engine off or on).
  • Measure voltage at the following terminal

    (wiring harness-side) when air intake mode at RECIRCULATE and FRESH.

    • Climate control unit terminal J
  • Is voltage normal?
 Yes Go to Step 11.
No Go to the next step.
3 INSPECT AIR INTAKE ACTUATOR CONNECTOR CONNECTION CONDITION Yes Go to the next step.
No Reconnect the air intake actuator connector properly.
Go to Step 13.
4 INSPECT AIR INTAKE ACTUATOR CONNECTOR TERMINAL CONDITION Yes Go to the next step.
No Repair/replace the connector or terminal.
Go to Step 13.
5 INSPECT AIR INTAKE ACTUATOR Yes Go to the next step.
No Replace the air intake actuator, then go to Step 13.
(See AIR INTAKE ACTUATOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .)
6 INSPECT CLIMATE CONTROL UNIT CONNECTOR CONNECTION CONDITION Yes Go to the next step.
No Reconnect the climate control unit connector properly.
Go to Step 13.
7 INSPECT CLIMATE CONTROL UNIT CONNECTOR TERMINAL CONDITION Yes Go to the next step.
No Repair/replace the connector or terminal.
Go to Step 13.
8* INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO POWER SUPPLY BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE
  • Climate control unit and air intake actuator connectors disconnected.
  • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
  • Switch the ignition ON (engine off or on).
  • Measure voltage at the following terminal (wiring harness-side).
    • Climate control unit terminal H
    • Climate control unit terminal J
    • Climate control unit terminal D
    • Climate control unit terminal K
      • Climate control unit terminal I
  • Are voltages approx. 0 V?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator terminal/evaporator temperature sensor terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 13.
9* INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE
  • Switch the ignition off.
  • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
  • Climate control unit and air intake actuator connectors disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Climate control unit terminal H
    • Climate control unit terminal J
    • Climate control unit terminal K
      • Climate control unit terminal I
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

Go to Step 13.
No Go to the next step.
10* INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY OR OPEN BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR
ELSEWHERE
  • Climate control unit and air intake actuator connectors disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Climate control unit terminal H - air intake actuator terminal E
    • Climate control unit terminal J - air intake actuator terminal F
    • Climate control unit terminal D - air intake actuator terminal G
    • Climate control unit terminal K - air intake actuator terminal B
      • Climate control unit terminal I - air intake actuator terminal C
  • Is there continuity?
 Yes Replace the climate control unit, then go to Step 13.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .)
No Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness.

Go to Step 13.
11 INSPECT AIR INTAKE LINK
  • Inspect the air intake link. (See BLOWER UNIT REMOVAL/INSTALLATION .)
    • Is there grease on link?
    • Are the links securely and properly installed?
      • Are the links free of obstructions and hindrances?
  • Are the above items normal?
 Yes Go to the next step.
No Apply grease to the links. If any the links are damaged, replace the air intake actuator, then go to Step 13.
(See BLOWER UNIT DISASSEMBLY/ASSEMBLY .)
12 INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR AIR INTAKE DOOR
  • Inspect the blower unit air intake door. (See BLOWER UNIT REMOVAL/INSTALLATION .)
    • Is the door free of obstructions, cracks, and damage?
      • Are the doors securely and properly installed?
  • Are the above items normal?
 Yes Go to the next step.
No Remove obstruction, or install the doors in the proper position. If any doors are cracked or damaged, replace them, then go to the next step.
13 CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
  • Does the air intake mode change smoothly?
 Yes Troubleshooting completed. Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
scientia non olet · About LEMON Manuals