Suzuki RA410, Manual

Page: 417 / 761

SENSOR
MAP SENSOR
OUTPUT VOLTAGE CHECK
1) Remove ECM/PCM according to previously outlined proce-
dure.
2) Connect connectors to ECM/PCM securely.
3) With connector connected to ECM/PCM, connect digital type
voltmeter as shown and check that ECM/PCM supply voltage
4.75 – 5.25V is applied to connector terminal “A8”.
TERMINAL ARRANGEMENT OF ECM/PCM
COUPLER (VIEWED FROM HARNESS SIDE)
A19
A8
4) Check output voltage at connector terminal “A19”.
Note that it varies with atmospheric pressure and altitude.
Also, start engine, if it can, and check if output voltage varies.
Output voltage (ECM/PCM supply voltage 4.75 – 5.25V, am-
bient temp. 10 – 40
5
C (50 – 104
5
F))
NOTE:
Note that atmospheric pressure varies depending on
weather conditions as well as altitude.
Take that into consideration when performing above
check.
If check result is not satisfactory in above step 3) or 4), check
MAP sensor and its circuit according to flow table of diagnostic
trouble code No. 11.
NOTE:
If output voltage does not vary when engine is started, it is
possible that vacuum hose and/or filter are clogged. Clean
them.
Another possibility is that filter in MAP sensor is clogged
from freezing. If it is suspected, leave it at room tempera-
ture (20
5
C (68
5
F)) for a while and recheck.
5) Upon completion of checking, install ECM/PCM and connect
ECM/PCM connector securely.
6E1-52 ENGINE AND EMISSION CONTROL SYSTEM
ALTITUDE
(Reference)
BAROMETRIC
PRESSURE
OUTPUT
VOLTAGE
(ft) (m) (mmHg) (V)
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
0
305
610
914
1219
1524
1829
2133
2438
2743
3048
760
733
707
682
658
634
611
589
567
546
526
1.85 – 2.43
1.80 – 2.37
1.75 – 2.31
1.70 – 2.25
1.65 – 2.20
1.60 – 2.15
1.55 – 2.10
1.51 – 2.05
1.47 – 2.00
1.42 – 1.95
1.38 – 1.91