Subsection 01 (ELECTRONIC FUEL INJECTION (EFI))
Thereafter, once the engine is started, it mea-
sures the air pressure in the intake manifold at
operating RPMs.
The sensor must be correctly installed on intake
manifold. Otherwise, the MAPTS could generate
a fault code for an unexpected sensor range at idle
when it reads the atmospheric pressure. If this
is the case, remove sensor and check for oil or
dirt on its end and if problem persists, check throt-
tle plate condition/position and the wiring harness.
Perform the following tests.
MAPTS Pressure Function Quick Test
1. Connect
vehicle
to
the
latest
applicable
B.U.D.S. software version.
2. In B.U.D.S., click the following:
–
Monitoring
tab
–
ECM
tab.
vmr2012-026-150_b
1. Monitoring tab
2. MAPTS pressure reading
3. Look for and take note of the MAPTS pressure
reading while the engine is stopped.
4. Perform the same test with a new MAPTS and
compare both readings.
Values have to be within ± 3.4 kPa (.5 PSI).
MAPTS PRESSURE FUNCTION QUICK TEST
RESULT
SERVICE ACTION
NO
READING
Circuit
continuity
test of
MAPTS
pressure
function
MAPTS
input
voltage
test
Repair or
replace
wiring
VALUE IS
OUT OF
RANGE
Replace MAPTS
Testing the MAPTS Input Voltage
Check the voltage output from ECM to the pres-
sure sensor.
1. Turn ignition key ON.
2. Set emergency engine stop switch to RUN.
3. Remove electrical connector from MAPTS.
4. Using a multimeteras per following table.
MAPTS CONNECTOR
MEASUREMENT
PIN
VOLTAGE
1
3
5 Vdc
If voltage test is good, replace the MAPTS.
If voltage test is not good, carry out the
MAPTS
CIRCUIT CONTINUITY TEST (PRESSURE FUNC-
TION)
.
Testing the MAPTS Circuit Continuity
(Pressure Function)
1. Disconnect the ECM connector.
2. Install the ECM adapter tool on the ECM con-
nector.
3. Using a multimeter, check continuity of the fol-
lowing circuits.
MAPTS CIRCUIT CONTINUITY TEST
(PRESSURE FUNCTION)
ECM
ADAPTER
MAPTS
CONNECTOR
RESISTANCE
VALUE
A1
Pin 3
F2
Pin 4
G2
Pin 1
Close to 0
If resistance is not within specification, repair or
replace the wiring harness between ECM connec-
tor and the MAPTS.
MAPTS Temperature Function
The sensor monitors the temperature in the intake
manifold.
Testing the MAPTS Temperature Function
1. Connect vehicle to the applicable B.U.D.S. soft-
ware version.
2. In B.U.D.S., click the following:
–
Monitoring
tab
–
ECM
tab.
3. Look for the
Intake Air
temperature reading
while the engine is stopped.
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