Nissan Altima 2007-2012 Service Manual: Insufficient heating
Component Function Check
SYMPTOM: Insufficient heating
INSPECTION FLOW
SYMPTOM: Insufficient heating
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
1. Press the AUTO switch.
2. Turn temperature control dial (LH) clockwise until 32°C (90°F) is displayed.
3. Check for hot air at discharge air outlets.
Can a symptom be duplicated? YES >> GO TO 3
NO >> GO TO 2
2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-5, "Description and Conditions".
Does another symptom exist? YES >> Refer to HAC-83, "Symptom Matrix Chart".
NO >> System OK.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4
4. CHECK ENGINE COOLING SYSEM
1. Check for proper engine coolant level. Refer to CO-11, "System Inspection" (QR25DE) or CO-34, "System Inspection" (VQ35DE).
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to CO-11, "System Inspection" (QR25DE) or CO-34, "System Inspection" (VQ35DE).
4. Check for air in cooling system.
>> GO TO 5
5. CHECK AIR MIX DOOR MOTOR OPERATION
Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly? YES >> GO TO 6
NO >> Check the air mix door motor circuit. Refer to HAC-35, "Diagnosis Procedure".
6. CHECK AIR DUCTS
Check for disconnected or leaking air ducts.
Is the inspection result normal? YES >> GO TO 7
NO >> Repair all disconnected or leaking air ducts.
NO >> Repair all disconnected or leaking air ducts.
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
Is the inspection result normal? YES >> Hot inlet hose and a warm outlet hose: GO TO 8
NO >> Both hoses warm: GO TO 9
8. CHECK ENGINE COOLANT SYSTEM
Check thermostat operation. Refer to CO-21, "Removal and Installation" (QR25DE) or CO-46, "Removal and Installation" (VQ35DE).
Is the inspection result normal? YES >> System OK.
NO >> Repair or replace as necessary.
9. CHECK HEATER HOSES
Check heater hoses for proper installation.
Is the inspection result normal? YES >> System OK.
NO >> 1. Back flush heater core.
2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to CO-12, "Changing Engine Coolant" (QR25DE) or CO-35, "Changing Engine Coolant" (VQ35DE).
4. To retest GO TO 10
10. CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
Is the inspection result normal? YES >> System OK.
NO >> Replace heater core Refer to VTL-22, "Removal and Installation".
Insufficient cooling
Component Function Check
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
1. Press the AUTO switch.
2. Turn temperature cont ...
Noise
Component Function Check
SYMPTOM: Noise
INSPECTION FLOW
*1 HAC-5, "Operational Check"
*2 EM-16, "Checking Drive Belts"
(QR25DE) or EM-121, "Checking
Drive Belts" ...
Other materials:
BCM (Body control module)
Reference Value
VALUES ON THE DIAGNOSIS TOOL
Terminal Layout
Physical Values
1: Sedan only
2: With LH front window anti-pinch
3: With LH and RH front window anti-pinch
4: With Intelligent Key
5: Without Intelligent Key
Wiring Diagram-Coupe ...
B2108 steering lock relay
Description
The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN
communication.
IPDM E/R turns the steering lock relay ON and transmits the release of the
steering to BCM.
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC B2108 is displayed with DTC U1000, first perf ...
ECU diagnosis
POWER STEERING CONTROL UNIT
Reference Value
TERMINAL LAYOUT
PHYSICAL VALUES
CAUTION:
When using circuit tester or oscilloscope to measure voltage for inspection, be
sure not to extend forcibly any connector terminals.
Wiring Diagram — ELECTRONICALLY CONTROLLED
POWER STEERING SYSTEM ...