Infiniti I35 (A33). Manual — part 545
ECON (ECONOMY) Mode
TROUBLE DIAGNOSIS PROCEDURE FOR ECON (ECONOMY) MODE
=NHHA0213
SYMPTOM:
I
ECON mode does not operate.
INSPECTION FLOW
SHA611FA
*3: HA-37
*4: HA-51
RHA410H
Ambient Sensor Circuit
COMPONENT DESCRIPTION
NHHA0214
The ambient sensor is attached in front of the right side condenser.
It detects ambient temperature and converts it into a resistance
value which is then input into the auto amplifier.
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
ECON (ECONOMY) Mode
HA-93
AMBIENT TEMPERATURE INPUT PROCESS
NHHA0215
The automatic amplifier includes a “processing circuit” for the ambi-
ent sensor input. However, when the temperature detected by the
ambient sensor increases quickly, the processing circuit retards the
auto amp. function. It only allows the auto amp. to recognize an
ambient temperature increase of 0.33°C (0.6°F) per 100 seconds.
As an example, consider stopping for a cup of coffee after high
speed driving. Although the actual ambient temperature has not
changed, the temperature detected by the ambient sensor will
increase. This is because the heat from the engine compartment
can radiate to the front grille area, location of the ambient sensor.
RHA051GA
DIAGNOSTIC PROCEDURE
NHHA0216
SYMPTOM: Ambient sensor circuit is open or shorted. (
or
−
is indicated on the display as a result of conducting Self-
diagnosis STEP-2.)
1
CHECK VOLTAGE BETWEEN AMBIENT SENSOR HARNESS CONNECTOR AND GROUND
Disconnect ambient sensor harness connector.
Do approx. 5 volts exist between ambient sensor harness connector E55 terminal No. 1 and ground?
RHA052GG
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 4.
TROUBLE DIAGNOSES
Ambient Sensor Circuit (Cont’d)
HA-94
2
CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP.
1. Disconnect auto amp. harness connector.
2. Check circuit continuity between ambient sensor harness connector E55 terminal No. 2 and auto amp. harness connec-
tor M59 terminal No. 11.
RHA475GF
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
GO TO 3.
NG
©
Repair harness or connector.
3
CHECK AMBIENT SENSOR
Refer to HA-96.
OK or NG
OK
©
1. Replace auto amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
©
Replace ambient sensor.
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Ambient Sensor Circuit (Cont’d)
HA-95
4
CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP.
1. Disconnect auto amp. harness connector.
2. Check circuit continuity between ambient sensor harness connector E55 terminal No. 1 and auto amp. harness connec-
tor M59 terminal No. 2.
SHA374FB
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
1. Replace auto amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
©
Repair harness or connector.
RHA411H
COMPONENT INSPECTION
NHHA0217
Ambient Sensor
NHHA0217S01
After disconnecting ambient sensor harness connector, measure
resistance between terminals 2 and 1 at sensor harness side, using
the table below.
Temperature °C (°F)
Resistance k
Ω
−15 (5)
12.73
−10 (14)
9.92
−5 (23)
7.80
0 (32)
6.19
5 (41)
4.95
10 (50)
3.99
15 (59)
3.24
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
TROUBLE DIAGNOSES
Ambient Sensor Circuit (Cont’d)
HA-96
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