BF135A•BF150A
5-71
• MAP Sensor Troubleshooting
MIL blinks 3 times.
1. Symptom reproduction test
-1. Reset the ECM.
-2. Turn the ignition switch OFF and connect the test har-
ness. Hold the sensor connector connected.
-3. Turn the ignition switch ON.
-4. Measure the voltage between the test harness B-5 ter-
minal (+) and the B-6 terminal (–).
Is the measured voltage 0.22 – 3.15V?
YES –
Temporary failure (Disappeared)
NO –
Perform "2. MAP sensor signal line short cir-
cuit check".
2. MAP sensor signal line short circuit check
-1. Turn the ignition switch OFF and disconnect the MAP
sensor 3P connector.
-2. Turn the ignition switch ON.
Measure the voltage
between the No. 3 (Brown/Yellow) terminal of the MAP
sensor harness side 3P connector and the engine
ground.
Is the measured voltage 4.75 – 5.25V?
YES –
Perform "3. MAP sensor signal line open cir-
cuit check".
NO –
Repair open in the wire between the ECM
and the MAP sensor.
3. MAP sensor signal line open circuit check
-1. Connect the ECM connector A.
-2. Turn the ignition switch ON.
-3. Measure the voltage between the No. 2 (White/Red)
terminal of the MAP sensor harness side 3P connec-
tor and the engine ground.
Is the measurement 4.75 – 5.25V?
YES –
Perform "4. MAP sensor signal line short cir-
cuit check".
NO –
Repair open in the wire between the ECM
and the MAP sensor.
4. MAP sensor signal line short circuit check
-1. Check for the continuity between the No. 2 (White/
Red) terminal of the MAP sensor harness side 3P con-
nector and the body ground.
Is there the continuity?
YES –
Repair short in the wire between the MAP
sensor and the ECM.
NO –
Perform “5. MAP sensor ground line open cir-
cuit check”.
B-6
B-5
PB (WHITE/RED)
MAP SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
MAP SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
VCC1
(BROWN/YELLOW)
MAP SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
PB (WHITE/RED)