Nissan Frontier D22. Manual - part 827

MTC-30

TROUBLE DIAGNOSIS

Operational Check

EJS00206

The purpose of the operational check is to confirm that the system operates as it should. The systems which
are checked are the blower, mode (discharge air), intake air (recirculation), temperature decrease, tempera-
ture increase, and A/C compressor.

CONDITIONS:

Engine running at normal operating temperature.

PROCEDURE:
1. Check Blower Motor

1.

Turn fan control knob to 1-speed.
Blower should operate on 1-speed.

2.

Then turn fan control knob to 2-speed, and continue checking
blower speed until all four speeds are checked.

3.

Leave blower on 4-speed.

If NG, go to 

MTC-37, "Trouble Diagnosis Procedure for Blower

Motor"

 .

If OK, continue with the check.

2. Check Discharge Air

1.

Turn mode control knob to each mode position.

2.

Confirm that discharge air comes out according to the air distri-
bution table at left.
Refer to 

MTC-21, "Discharge Air Flow"

 .

If NG, go to 

MTC-32, "Trouble Diagnosis Procedure For Mode Door"

.
If OK, continue with next check.

WHA317

WHA318

AHA983

TROUBLE DIAGNOSIS

MTC-31

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MTC

3. Check Recirculation

1.

Press recirculation switch.
Recirculation indicator should light.

2.

Listen for intake door position to change (you should hear
blower sound change slightly).

If NG, go to 

MTC-34, "Trouble Diagnosis Procedure for Intake Door"

 .

If OK, continue with next check.

4. Check Temperature Decrease

1.

Turn temperature control knob to full cold.

2.

Check for cold air at discharge air outlets.

If NG, go to 

MTC-49, "TROUBLE DIAGNOSIS PROCEDURE FOR

INSUFFICIENT COOLING"

 .

If OK, continue with next check.

5. Check Temperature Increase

1.

Turn temperature control knob to full hot.

2.

Check for hot air at discharge air outlets.

If NG, go to 

MTC-57, "TROUBLE DIAGNOSIS PROCEDURE FOR

INSUFFICIENT HEATING"

 .

If OK, continue with next check.

6. Check A/C Switch

1.

Turn fan control knob to the desired (1 to 4 speed) position.

2.

Push the A/C switch to turn ON the air conditioner.
The indicator lamp should come on when air conditioner is ON.

3.

Confirm that the compressor clutch engages (audio or visual
inspection).

4.

Check for cold air at the appropriate discharge air outlets.

If NG, go to 

MTC-42, "TROUBLE DIAGNOSIS PROCEDURE FOR

MAGNET CLUTCH"

 .

If OK, continue with next check.
If all operational checks are OK (symptom cannot be duplicated), go
to 

GI-25, "How to Perform Efficient Diagnosis for an Electrical Inci-

dent"

 , and perform tests as outlined to simulate driving conditions environment. If symptom appears, refer to

MTC-22, "Symptom Table"

  and perform applicable trouble diagnoses procedures.

WHA319

WHA320

WHA321

WHA322

MTC-32

TROUBLE DIAGNOSIS

Mode Door

EJS00207

TROUBLE DIAGNOSIS PROCEDURE FOR MODE DOOR

Symptom:

●

Mode door does not change.

Inspection Flow

WHA325

*1:

MTC-21

*2:

MTC-33

*3:

MTC-30

*4:

MTC-22

TROUBLE DIAGNOSIS

MTC-33

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MTC

MODE DOOR CONTROL LINKAGE ADJUSTMENT

Mode door control linkage

●

Turn mode door control knob to

 position.

●

Set side link in DEF mode.

●

Pull on outer cable in direction of arrow and then clamp it.

●

After positioning mode door control cable, check that it
operates properly.

AHA121A