Isuzu Rodeo UE. Service manual — part 345
6E2–135
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
If DTC P0108 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set. If
it is determined that the DTC occurs intermittently,
performing the DTC P1108 Diagnostic Chart may isolate
the cause of the fault.
f
The MAP sensor shares a 5 Volt Reference with the
Fuel pressure sensor. If these codes are also set, it
could indicate a problem with the 5 Volt reference
circuit.
f
The MAP sensor shares a ground with the Fuel
pressure Sensor, the ECT sensor, and the
Transmission Fluid Temperature sensor.
DTC P0108 – MAP Sensor Circuit High Voltage
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. If the engine idle is rough, unstable or incorrect,
repair the idle problem before using this chart. Refer
to
Symptoms section.
2. With the engine idling, note the MAP value on the
Tech 2.
Is the MAP reading above the specified value?
90 kPa
Go to
Step 4
Go to
Step 3
3
1. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor “DTC” info for DTC P0108.
Does the Tech 2 indicate DTC P0108 failed this
ignition?
—
Go to
Step 4
Refer to
Diagnostic
Aids
4
1. Ignition “OFF.”
2. Disconnect the MAP sensor electrical connector.
3. Ignition “ON.”
4. Note the MAP sensor voltage displayed on the Tech
2.
Is the MAP sensor voltage at the specified value? (If no,
start with diagnostic chart for other sensors in the
circuit and see if 5 V returns)
0.0 V 11 kPa
Go to
Step 5
Go to
Step 6
5
Probe the sensor ground circuit with a test light to B+.
Is the test light “ON?”
—
Go to
Step 7
Go to
Step 9
6
1. Check the MAP signal circuit for a short to voltage or
a short to the 5 volt reference “A” circuit.
2. If the MAP sensor signal circuit is shorted, repair
circuit as necessary.
Was the MAP sensor signal circuit shorted?
—
Verify repair
Go to
Step 11
7
1. Check for a poor sensor ground terminal connection
at the MAP sensor electrical connector.
2. If a problem if found, replace the faulty terminal.
Did the terminal require replacement?
—
Verify repair
Go to
Step 8
8
Check for a plugged or leaking vacuum supply to the
MAP sensor.
Is the vacuum supply plugged or leaking?
—
Verify repair
Go to
Step 12
9
1. Check for a poor sensor ground terminal connection
at the PCM.
2. If a problem is found, replace the faulty terminal.
Did the terminal require replacement?
—
Verify repair
Go to
Step 10
6E2–136
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0108 – MAP Sensor Circuit High Voltage
(Cont'd)
Step
No
Yes
Value(s)
Action
10
1. Check the continuity of the MAP sensor ground
circuit.
2. If the MAP sensor ground circuit measures over 5
ohms, repair open or poor connection.
Was a condition found and corrected?
—
Verify repair
Go to
Step 11
11
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain Control Module and Sensors for
procedures.
And also refer to latest service bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
—
Verify Repair
—
12
Replace the MAP sensor.
Is the action complete?
—
Verify repair
—
6E2–137
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0112 IAT Sensor Circuit Low Voltage
D06RW078
Circuit Description
The intake air temperature (IAT) sensor is a thermistor
which measures the temperature of the air entering the
engine. The powertrain control module (PCM) applies 5
volts through a pull-up resistor to the IAT sensor. When
the intake air is cold, the sensor resistance is high and the
PCM will monitor a high signal voltage on the IAT signal
circuit. If the intake air is warm, the sensor resistance is
lower, causing the PCM to monitor a lower voltage. DTC
P0112 will set when the PCM detects an excessively low
signal voltage on the intake air temperature sensor signal
circuit.
Conditions for Setting the DTC
f
The engine has been running for over 2 minutes.
f
Vehicle speed is greater than 30 mph (48 km/h) .
f
IAT signal voltage indicates an intake air temperature
greater than 148
°
C (298
°
F) (about 5 volts) for a total
of 12.5 seconds over a 25-second period of time.
Action Taken When the DTC Sets
f
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
f
The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
f
The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
f
A history DTC P0112 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
f
DTC P0112 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
f
Poor connection at PCM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.
f
Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
IAT display on the Tech 2 while moving connectors and
wiring harnesses related to the IAT sensor. A change
in the IAT display will indicate the location of the fault.
If DTC P0112 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
2. Verifies that the fault is present.
6E2–138
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
3. If DTC P0112 can be repeated only by duplicating
the Failure Records condition, refer to the
Temperature vs. Resistance Value table. The table
may be used to test the IAT sensor at various
temperatures to evaluate the possibility of a
“shifted” sensor that may be stored above or below
a certain temperature. If this is the case, replace
the IAT sensor. If the IAT sensor appears to be OK,
the fault is intermittent; refer to
Diagnostic Aids.
Intake Air Temperature Sensor
°
C
°
F
OHMS
Temperature
vs. Resistance
Values
(approximate)
100
212
177
80
176
332
60
140
667
45
113
1188
35
95
1802
25
77
2796
15
59
4450
5
41
7280
–5
23
12300
–15
5
21450
–30
–22
52700
–40
–40
100700
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